Mipi_display.c contains a set of dsi helpers. This file is a copy of file drm_mipi_dsi.c (linux kernel).

Signed-off-by: yannick fertre yannick.fertre@st.com --- drivers/video/Kconfig | 7 + drivers/video/Makefile | 2 + drivers/video/mipi_display.c | 809 +++++++++++++++++++++++++++++++++++++++++++ include/mipi_display.h | 257 +++++++++++++- 4 files changed, 1074 insertions(+), 1 deletion(-) create mode 100644 drivers/video/mipi_display.c

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 2fc0def..1981298 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -75,6 +75,13 @@ config VIDEO_ANSI Enable ANSI escape sequence decoding for a more fully functional console.

+config VIDEO_MIPI_DSI + bool "Support MIPI DSI interface" + depends on DM_VIDEO + default y if DM_VIDEO + help + Support MIPI DSI interface for driving a MIPI compatible LCD panel. + config CONSOLE_NORMAL bool "Support a simple text console" depends on DM_VIDEO diff --git a/drivers/video/Makefile b/drivers/video/Makefile index dfafe08..a6f927f 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -1,3 +1,4 @@ + # # (C) Copyright 2000-2007 # Wolfgang Denk, DENX Software Engineering, wd@denx.de. @@ -52,6 +53,7 @@ obj-$(CONFIG_FORMIKE) += formike.o obj-$(CONFIG_LG4573) += lg4573.o obj-$(CONFIG_AM335X_LCD) += am335x-fb.o obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o +obj-${CONFIG_VIDEO_MIPI_DSI} += mipi_display.o obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o obj-${CONFIG_VIDEO_TEGRA124} += tegra124/ obj-${CONFIG_EXYNOS_FB} += exynos/ diff --git a/drivers/video/mipi_display.c b/drivers/video/mipi_display.c new file mode 100644 index 0000000..ffd4bd7 --- /dev/null +++ b/drivers/video/mipi_display.c @@ -0,0 +1,809 @@ +/* + * MIPI DSI Bus + * + * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd. + * Copyright (C) 2018 STMicroelectronics - All Rights Reserved + * Andrzej Hajda a.hajda@samsung.com + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <common.h> +#include <clk.h> +#include <display.h> +#include <dm.h> +#include <mipi_display.h> + +/** + * DOC: dsi helpers + * + * These functions contain some common logic and helpers to deal with MIPI DSI + * peripherals. + * + * Helpers are provided for a number of standard MIPI DSI command as well as a + * subset of the MIPI DCS command set. + */ + +/** + * mipi_dsi_attach - attach a DSI device to its DSI host + * @dsi: DSI peripheral + */ +int mipi_dsi_attach(struct mipi_dsi_device *dsi) +{ + const struct mipi_dsi_host_ops *ops = dsi->host->ops; + + if (!ops || !ops->attach) + return -ENOSYS; + + return ops->attach(dsi->host, dsi); +} +EXPORT_SYMBOL(mipi_dsi_attach); + +/** + * mipi_dsi_detach - detach a DSI device from its DSI host + * @dsi: DSI peripheral + */ +int mipi_dsi_detach(struct mipi_dsi_device *dsi) +{ + const struct mipi_dsi_host_ops *ops = dsi->host->ops; + + if (!ops || !ops->detach) + return -ENOSYS; + + return ops->detach(dsi->host, dsi); +} +EXPORT_SYMBOL(mipi_dsi_detach); + +static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi, + struct mipi_dsi_msg *msg) +{ + const struct mipi_dsi_host_ops *ops = dsi->host->ops; + + if (!ops || !ops->transfer) + return -ENOSYS; + + if (dsi->mode_flags & MIPI_DSI_MODE_LPM) + msg->flags |= MIPI_DSI_MSG_USE_LPM; + + return ops->transfer(dsi->host, msg); +} + +/** + * mipi_dsi_packet_format_is_short - check if a packet is of the short format + * @type: MIPI DSI data type of the packet + * + * Return: true if the packet for the given data type is a short packet, false + * otherwise. + */ +bool mipi_dsi_packet_format_is_short(u8 type) +{ + switch (type) { + case MIPI_DSI_V_SYNC_START: + case MIPI_DSI_V_SYNC_END: + case MIPI_DSI_H_SYNC_START: + case MIPI_DSI_H_SYNC_END: + case MIPI_DSI_END_OF_TRANSMISSION: + case MIPI_DSI_COLOR_MODE_OFF: + case MIPI_DSI_COLOR_MODE_ON: + case MIPI_DSI_SHUTDOWN_PERIPHERAL: + case MIPI_DSI_TURN_ON_PERIPHERAL: + case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM: + case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM: + case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM: + case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM: + case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM: + case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM: + case MIPI_DSI_DCS_SHORT_WRITE: + case MIPI_DSI_DCS_SHORT_WRITE_PARAM: + case MIPI_DSI_DCS_READ: + case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE: + return true; + } + + return false; +} +EXPORT_SYMBOL(mipi_dsi_packet_format_is_short); + +/** + * mipi_dsi_packet_format_is_long - check if a packet is of the long format + * @type: MIPI DSI data type of the packet + * + * Return: true if the packet for the given data type is a long packet, false + * otherwise. + */ +bool mipi_dsi_packet_format_is_long(u8 type) +{ + switch (type) { + case MIPI_DSI_NULL_PACKET: + case MIPI_DSI_BLANKING_PACKET: + case MIPI_DSI_GENERIC_LONG_WRITE: + case MIPI_DSI_DCS_LONG_WRITE: + case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20: + case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24: + case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16: + case MIPI_DSI_PACKED_PIXEL_STREAM_30: + case MIPI_DSI_PACKED_PIXEL_STREAM_36: + case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12: + case MIPI_DSI_PACKED_PIXEL_STREAM_16: + case MIPI_DSI_PACKED_PIXEL_STREAM_18: + case MIPI_DSI_PIXEL_STREAM_3BYTE_18: + case MIPI_DSI_PACKED_PIXEL_STREAM_24: + return true; + } + + return false; +} +EXPORT_SYMBOL(mipi_dsi_packet_format_is_long); + +/** + * mipi_dsi_create_packet - create a packet from a message according to the + * DSI protocol + * @packet: pointer to a DSI packet structure + * @msg: message to translate into a packet + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_create_packet(struct mipi_dsi_packet *packet, + const struct mipi_dsi_msg *msg) +{ + if (!packet || !msg) + return -EINVAL; + + /* do some minimum sanity checking */ + if (!mipi_dsi_packet_format_is_short(msg->type) && + !mipi_dsi_packet_format_is_long(msg->type)) + return -EINVAL; + + if (msg->channel > 3) + return -EINVAL; + + memset(packet, 0, sizeof(*packet)); + packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f); + + /* TODO: compute ECC if hardware support is not available */ + + /* + * Long write packets contain the word count in header bytes 1 and 2. + * The payload follows the header and is word count bytes long. + * + * Short write packets encode up to two parameters in header bytes 1 + * and 2. + */ + if (mipi_dsi_packet_format_is_long(msg->type)) { + packet->header[1] = (msg->tx_len >> 0) & 0xff; + packet->header[2] = (msg->tx_len >> 8) & 0xff; + + packet->payload_length = msg->tx_len; + packet->payload = msg->tx_buf; + } else { + const u8 *tx = msg->tx_buf; + + packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0; + packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0; + } + + packet->size = sizeof(packet->header) + packet->payload_length; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_create_packet); + +/* + * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the + * the payload in a long packet transmitted from the peripheral back to the + * host processor + * @dsi: DSI peripheral device + * @value: the maximum size of the payload + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, + u16 value) +{ + u8 tx[2] = { value & 0xff, value >> 8 }; + struct mipi_dsi_msg msg = { + .channel = dsi->channel, + .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE, + .tx_len = sizeof(tx), + .tx_buf = tx, + }; + int ret = mipi_dsi_device_transfer(dsi, &msg); + + return (ret < 0) ? ret : 0; +} +EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size); + +/** + * mipi_dsi_generic_write() - transmit data using a generic write packet + * @dsi: DSI peripheral device + * @payload: buffer containing the payload + * @size: size of payload buffer + * + * This function will automatically choose the right data type depending on + * the payload length. + * + * Return: The number of bytes transmitted on success or a negative error code + * on failure. + */ +ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload, + size_t size) +{ + struct mipi_dsi_msg msg = { + .channel = dsi->channel, + .tx_buf = payload, + .tx_len = size + }; + + switch (size) { + case 0: + msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM; + break; + + case 1: + msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM; + break; + + case 2: + msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM; + break; + + default: + msg.type = MIPI_DSI_GENERIC_LONG_WRITE; + break; + } + + return mipi_dsi_device_transfer(dsi, &msg); +} +EXPORT_SYMBOL(mipi_dsi_generic_write); + +/** + * mipi_dsi_generic_read() - receive data using a generic read packet + * @dsi: DSI peripheral device + * @params: buffer containing the request parameters + * @num_params: number of request parameters + * @data: buffer in which to return the received data + * @size: size of receive buffer + * + * This function will automatically choose the right data type depending on + * the number of parameters passed in. + * + * Return: The number of bytes successfully read or a negative error code on + * failure. + */ +ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params, + size_t num_params, void *data, size_t size) +{ + struct mipi_dsi_msg msg = { + .channel = dsi->channel, + .tx_len = num_params, + .tx_buf = params, + .rx_len = size, + .rx_buf = data + }; + + switch (num_params) { + case 0: + msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM; + break; + + case 1: + msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM; + break; + + case 2: + msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM; + break; + + default: + return -EINVAL; + } + + return mipi_dsi_device_transfer(dsi, &msg); +} +EXPORT_SYMBOL(mipi_dsi_generic_read); + +/** + * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload + * @dsi: DSI peripheral device + * @data: buffer containing data to be transmitted + * @len: size of transmission buffer + * + * This function will automatically choose the right data type depending on + * the command payload length. + * + * Return: The number of bytes successfully transmitted or a negative error + * code on failure. + */ +ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, + const void *data, size_t len) +{ + struct mipi_dsi_msg msg = { + .channel = dsi->channel, + .tx_buf = data, + .tx_len = len + }; + + switch (len) { + case 0: + return -EINVAL; + + case 1: + msg.type = MIPI_DSI_DCS_SHORT_WRITE; + break; + + case 2: + msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM; + break; + + default: + msg.type = MIPI_DSI_DCS_LONG_WRITE; + break; + } + + return mipi_dsi_device_transfer(dsi, &msg); +} +EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer); + +/** + * mipi_dsi_dcs_write() - send DCS write command + * @dsi: DSI peripheral device + * @cmd: DCS command + * @data: buffer containing the command payload + * @len: command payload length + * + * This function will automatically choose the right data type depending on + * the command payload length. + * + * Return: The number of bytes successfully transmitted or a negative error + * code on failure. + */ +ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, + const void *data, size_t len) +{ + ssize_t err; + size_t size; + u8 *tx; + + if (len > 0) { + size = 1 + len; + + tx = kmalloc(size, GFP_KERNEL); + if (!tx) + return -ENOMEM; + + /* concatenate the DCS command byte and the payload */ + tx[0] = cmd; + memcpy(&tx[1], data, len); + } else { + tx = &cmd; + size = 1; + } + + err = mipi_dsi_dcs_write_buffer(dsi, tx, size); + + if (len > 0) + kfree(tx); + + return err; +} +EXPORT_SYMBOL(mipi_dsi_dcs_write); + +/** + * mipi_dsi_dcs_read() - send DCS read request command + * @dsi: DSI peripheral device + * @cmd: DCS command + * @data: buffer in which to receive data + * @len: size of receive buffer + * + * Return: The number of bytes read or a negative error code on failure. + */ +ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, + size_t len) +{ + struct mipi_dsi_msg msg = { + .channel = dsi->channel, + .type = MIPI_DSI_DCS_READ, + .tx_buf = &cmd, + .tx_len = 1, + .rx_buf = data, + .rx_len = len + }; + + return mipi_dsi_device_transfer(dsi, &msg); +} +EXPORT_SYMBOL(mipi_dsi_dcs_read); + +/** + * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any + * given pixel format defined by the MIPI DSI + * specification + * @fmt: MIPI DSI pixel format + * + * Returns: The number of bits per pixel of the given pixel format. + */ +int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt) +{ + debug("%s\n", __func__); + + switch (fmt) { + case MIPI_DSI_FMT_RGB888: + case MIPI_DSI_FMT_RGB666: + return 24; + + case MIPI_DSI_FMT_RGB666_PACKED: + return 18; + + case MIPI_DSI_FMT_RGB565: + return 16; + } + + return -EINVAL; +} +EXPORT_SYMBOL(mipi_dsi_pixel_format_to_bpp); + +/** + * mipi_dsi_dcs_nop() - send DCS nop packet + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_nop); + +/** + * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset); + +/** + * mipi_dsi_dcs_get_power_mode() - query the display module's current power + * mode + * @dsi: DSI peripheral device + * @mode: return location for the current power mode + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode) +{ + ssize_t err; + + err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode, + sizeof(*mode)); + if (err <= 0) { + if (err == 0) + err = -ENODATA; + + return err; + } + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode); + +/** + * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image + * data used by the interface + * @dsi: DSI peripheral device + * @format: return location for the pixel format + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format) +{ + ssize_t err; + + err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format, + sizeof(*format)); + if (err <= 0) { + if (err == 0) + err = -ENODATA; + + return err; + } + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format); + +/** + * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the + * display module except interface communication + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode); + +/** + * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display + * module + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode); + +/** + * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the + * display device + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off); + +/** + * mipi_dsi_dcs_set_display_on() - start displaying the image data on the + * display device + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure + */ +int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on); + +/** + * mipi_dsi_dcs_set_column_address() - define the column extent of the frame + * memory accessed by the host processor + * @dsi: DSI peripheral device + * @start: first column of frame memory + * @end: last column of frame memory + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, + u16 end) +{ + u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff }; + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload, + sizeof(payload)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address); + +/** + * mipi_dsi_dcs_set_page_address() - define the page extent of the frame + * memory accessed by the host processor + * @dsi: DSI peripheral device + * @start: first page of frame memory + * @end: last page of frame memory + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, + u16 end) +{ + u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff }; + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload, + sizeof(payload)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address); + +/** + * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect + * output signal on the TE signal line + * @dsi: DSI peripheral device + * + * Return: 0 on success or a negative error code on failure + */ +int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off); + +/** + * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect + * output signal on the TE signal line. + * @dsi: DSI peripheral device + * @mode: the Tearing Effect Output Line mode + * + * Return: 0 on success or a negative error code on failure + */ +int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, + enum mipi_dsi_dcs_tear_mode mode) +{ + u8 value = mode; + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value, + sizeof(value)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on); + +/** + * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image + * data used by the interface + * @dsi: DSI peripheral device + * @format: pixel format + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format) +{ + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format, + sizeof(format)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format); + +/** + * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for + * the Tearing Effect output signal of the display module + * @dsi: DSI peripheral device + * @scanline: scanline to use as trigger + * + * Return: 0 on success or a negative error code on failure + */ +int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline) +{ + u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, scanline >> 8, + scanline & 0xff }; + ssize_t err; + + err = mipi_dsi_generic_write(dsi, payload, sizeof(payload)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline); + +/** + * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the + * display + * @dsi: DSI peripheral device + * @brightness: brightness value + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, + u16 brightness) +{ + u8 payload[2] = { brightness & 0xff, brightness >> 8 }; + ssize_t err; + + err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, + payload, sizeof(payload)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness); + +/** + * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value + * of the display + * @dsi: DSI peripheral device + * @brightness: brightness value + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, + u16 *brightness) +{ + ssize_t err; + + err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS, + brightness, sizeof(*brightness)); + if (err <= 0) { + if (err == 0) + err = -ENODATA; + + return err; + } + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness); + +MODULE_AUTHOR("Andrzej Hajda a.hajda@samsung.com"); +MODULE_AUTHOR("Yannick Fertre yannick.fertre@st.com"); +MODULE_DESCRIPTION("MIPI DSI Bus"); +MODULE_LICENSE("GPL and additional rights"); diff --git a/include/mipi_display.h b/include/mipi_display.h index ddcc8ca..8f9d4a4 100644 --- a/include/mipi_display.h +++ b/include/mipi_display.h @@ -4,12 +4,16 @@ * * Copyright (C) 2010 Guennadi Liakhovetski g.liakhovetski@gmx.de * Copyright (C) 2006 Nokia Corporation - * Author: Imre Deak imre.deak@nokia.com + * Copyright (C) 2018 STMicroelectronics - All Rights Reserved + * Author(s): Imre Deak imre.deak@nokia.com + * Yannick Fertre yannick.fertre@st.com + * Philippe Cornu philippe.cornu@st.com * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ + #ifndef MIPI_DISPLAY_H #define MIPI_DISPLAY_H

@@ -115,6 +119,14 @@ enum { MIPI_DCS_READ_MEMORY_CONTINUE = 0x3E, MIPI_DCS_SET_TEAR_SCANLINE = 0x44, MIPI_DCS_GET_SCANLINE = 0x45, + MIPI_DCS_SET_DISPLAY_BRIGHTNESS = 0x51, /* MIPI DCS 1.3 */ + MIPI_DCS_GET_DISPLAY_BRIGHTNESS = 0x52, /* MIPI DCS 1.3 */ + MIPI_DCS_WRITE_CONTROL_DISPLAY = 0x53, /* MIPI DCS 1.3 */ + MIPI_DCS_GET_CONTROL_DISPLAY = 0x54, /* MIPI DCS 1.3 */ + MIPI_DCS_WRITE_POWER_SAVE = 0x55, /* MIPI DCS 1.3 */ + MIPI_DCS_GET_POWER_SAVE = 0x56, /* MIPI DCS 1.3 */ + MIPI_DCS_SET_CABC_MIN_BRIGHTNESS = 0x5E, /* MIPI DCS 1.3 */ + MIPI_DCS_GET_CABC_MIN_BRIGHTNESS = 0x5F, /* MIPI DCS 1.3 */ MIPI_DCS_READ_DDB_START = 0xA1, MIPI_DCS_READ_DDB_CONTINUE = 0xA8, }; @@ -127,4 +139,247 @@ enum { #define MIPI_DCS_PIXEL_FMT_8BIT 2 #define MIPI_DCS_PIXEL_FMT_3BIT 1

+struct mipi_dsi_host; +struct mipi_dsi_device; + +/* request ACK from peripheral */ +#define MIPI_DSI_MSG_REQ_ACK BIT(0) +/* use Low Power Mode to transmit message */ +#define MIPI_DSI_MSG_USE_LPM BIT(1) + +/** + * struct mipi_dsi_msg - read/write DSI buffer + * @channel: virtual channel id + * @type: payload data type + * @flags: flags controlling this message transmission + * @tx_len: length of @tx_buf + * @tx_buf: data to be written + * @rx_len: length of @rx_buf + * @rx_buf: data to be read, or NULL + */ +struct mipi_dsi_msg { + u8 channel; + u8 type; + u16 flags; + + size_t tx_len; + const void *tx_buf; + + size_t rx_len; + void *rx_buf; +}; + +bool mipi_dsi_packet_format_is_short(u8 type); +bool mipi_dsi_packet_format_is_long(u8 type); + +/** + * struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format + * @size: size (in bytes) of the packet + * @header: the four bytes that make up the header (Data ID, Word Count or + * Packet Data, and ECC) + * @payload_length: number of bytes in the payload + * @payload: a pointer to a buffer containing the payload, if any + */ +struct mipi_dsi_packet { + size_t size; + u8 header[4]; + size_t payload_length; + const u8 *payload; +}; + +int mipi_dsi_create_packet(struct mipi_dsi_packet *packet, + const struct mipi_dsi_msg *msg); + +/** + * struct mipi_dsi_host_ops - DSI bus operations + * @attach: attach DSI device to DSI host + * @detach: detach DSI device from DSI host + * @transfer: transmit a DSI packet + * + * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg + * structures. This structure contains information about the type of packet + * being transmitted as well as the transmit and receive buffers. When an + * error is encountered during transmission, this function will return a + * negative error code. On success it shall return the number of bytes + * transmitted for write packets or the number of bytes received for read + * packets. + * + * Note that typically DSI packet transmission is atomic, so the .transfer() + * function will seldomly return anything other than the number of bytes + * contained in the transmit buffer on success. + */ +struct mipi_dsi_host_ops { + int (*attach)(struct mipi_dsi_host *host, + struct mipi_dsi_device *dsi); + int (*detach)(struct mipi_dsi_host *host, + struct mipi_dsi_device *dsi); + ssize_t (*transfer)(struct mipi_dsi_host *host, + const struct mipi_dsi_msg *msg); +}; + +/** + * struct mipi_dsi_host - DSI host device + * @dev: driver model device node for this DSI host + * @ops: DSI host operations + * @list: list management + */ +struct mipi_dsi_host { + struct device *dev; + const struct mipi_dsi_host_ops *ops; + struct list_head list; +}; + +/* DSI mode flags */ + +/* video mode */ +#define MIPI_DSI_MODE_VIDEO BIT(0) +/* video burst mode */ +#define MIPI_DSI_MODE_VIDEO_BURST BIT(1) +/* video pulse mode */ +#define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2) +/* enable auto vertical count mode */ +#define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3) +/* enable hsync-end packets in vsync-pulse and v-porch area */ +#define MIPI_DSI_MODE_VIDEO_HSE BIT(4) +/* disable hfront-porch area */ +#define MIPI_DSI_MODE_VIDEO_HFP BIT(5) +/* disable hback-porch area */ +#define MIPI_DSI_MODE_VIDEO_HBP BIT(6) +/* disable hsync-active area */ +#define MIPI_DSI_MODE_VIDEO_HSA BIT(7) +/* flush display FIFO on vsync pulse */ +#define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8) +/* disable EoT packets in HS mode */ +#define MIPI_DSI_MODE_EOT_PACKET BIT(9) +/* device supports non-continuous clock behavior (DSI spec 5.6.1) */ +#define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10) +/* transmit data in low power */ +#define MIPI_DSI_MODE_LPM BIT(11) + +enum mipi_dsi_pixel_format { + MIPI_DSI_FMT_RGB888, + MIPI_DSI_FMT_RGB666, + MIPI_DSI_FMT_RGB666_PACKED, + MIPI_DSI_FMT_RGB565, +}; + +#define DSI_DEV_NAME_SIZE 20 + +/** + * struct mipi_dsi_device_info - template for creating a mipi_dsi_device + * @type: DSI peripheral chip type + * @channel: DSI virtual channel assigned to peripheral + * @node: pointer to OF device node or NULL + * + * This is populated and passed to mipi_dsi_device_new to create a new + * DSI device + */ +struct mipi_dsi_device_info { + char type[DSI_DEV_NAME_SIZE]; + u32 channel; + struct device_node *node; +}; + +/** + * struct mipi_dsi_device - DSI peripheral device + * @host: DSI host for this peripheral + * @dev: driver model device node for this peripheral + * @name: DSI peripheral chip type + * @channel: virtual channel assigned to the peripheral + * @format: pixel format for video mode + * @lanes: number of active data lanes + * @mode_flags: DSI operation mode related flags + */ +struct mipi_dsi_device { + struct mipi_dsi_host *host; + struct udevice *dev; + + char name[DSI_DEV_NAME_SIZE]; + unsigned int channel; + unsigned int lanes; + enum mipi_dsi_pixel_format format; + unsigned long mode_flags; +}; + +/** + * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode + * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking + * information only + * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both + * V-Blanking and H-Blanking information + */ +enum mipi_dsi_dcs_tear_mode { + MIPI_DSI_DCS_TEAR_MODE_VBLANK, + MIPI_DSI_DCS_TEAR_MODE_VHBLANK, +}; + +/** + * struct mipi_dsi_panel_plat - DSI panel platform data + * @device: DSI peripheral device + */ +struct mipi_dsi_panel_plat { + struct mipi_dsi_device *device; +}; + +int mipi_dsi_attach(struct mipi_dsi_device *dsi); +int mipi_dsi_detach(struct mipi_dsi_device *dsi); +int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt); + +/* bit compatible with the xrandr RR_ definitions (bits 0-13) + * + * ABI warning: Existing userspace really expects + * the mode flags to match the xrandr definitions. Any + * changes that don't match the xrandr definitions will + * likely need a new client cap or some other mechanism + * to avoid breaking existing userspace. This includes + * allocating new flags in the previously unused bits! + */ +#define MIPI_DSI_FLAG_PHSYNC BIT(0) +#define MIPI_DSI_FLAG_NHSYNC BIT(1) +#define MIPI_DSI_FLAG_PVSYNC BIT(2) +#define MIPI_DSI_FLAG_NVSYNC BIT(3) +#define MIPI_DSI_FLAG_INTERLACE BIT(4) +#define MIPI_DSI_FLAG_DBLSCAN BIT(5) +#define MIPI_DSI_FLAG_CSYNC BIT(6) +#define MIPI_DSI_FLAG_PCSYNC BIT(7) +#define MIPI_DSI_FLAG_NCSYNC BIT(8) +#define MIPI_DSI_FLAG_HSKEW BIT(9) /* hskew provided */ +#define MIPI_DSI_FLAG_BCAST BIT(10) +#define MIPI_DSI_FLAG_PIXMUX BIT(11) +#define MIPI_DSI_FLAG_DBLCLK BIT(12) +#define MIPI_DSI_FLAG_CLKDIV2 BIT(13) + +/* request ACK from peripheral */ +#define MIPI_DSI_MSG_REQ_ACK BIT(0) +/* use Low Power Mode to transmit message */ +#define MIPI_DSI_MSG_USE_LPM BIT(1) + +ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, + const void *data, size_t len); +ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, + const void *data, size_t len); +ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, + size_t len); +int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode); +int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format); +int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, + u16 end); +int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, + u16 end); +int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi); +int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, + enum mipi_dsi_dcs_tear_mode mode); +int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format); +int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline); +int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, + u16 brightness); +int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, + u16 *brightness); + #endif

Add a Synopsys Designware MIPI DSI host bridge driver, based on the Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.

Signed-off-by: yannick fertre yannick.fertre@st.com --- drivers/video/Kconfig | 9 + drivers/video/Makefile | 1 + drivers/video/dw_mipi_dsi.c | 822 ++++++++++++++++++++++++++++++++++++++++++++ include/dw_mipi_dsi.h | 32 ++ 4 files changed, 864 insertions(+) create mode 100644 drivers/video/dw_mipi_dsi.c create mode 100644 include/dw_mipi_dsi.h

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 2ce49bc..fa248fc 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -656,6 +656,15 @@ config VIDEO_DW_HDMI rather requires a SoC-specific glue driver to call it), it can not be enabled from the configuration menu.

+config VIDEO_DW_MIPI_DSI + bool + help + Enables the common driver code for the Designware MIPI DSI + block found in SoCs from various vendors. + As this does not provide any functionality by itself (but + rather requires a SoC-specific glue driver to call it), it + can not be enabled from the configuration menu. + config VIDEO_SIMPLE bool "Simple display driver for preconfigured display" help diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 0590759..b266dfd 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -54,6 +54,7 @@ obj-$(CONFIG_FORMIKE) += formike.o obj-$(CONFIG_LG4573) += lg4573.o obj-$(CONFIG_AM335X_LCD) += am335x-fb.o obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o +obj-$(CONFIG_VIDEO_DW_MIPI_DSI) += dw_mipi_dsi.o obj-${CONFIG_VIDEO_MIPI_DSI} += mipi_display.o obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o obj-${CONFIG_VIDEO_TEGRA124} += tegra124/ diff --git a/drivers/video/dw_mipi_dsi.c b/drivers/video/dw_mipi_dsi.c new file mode 100644 index 0000000..d316c1b --- /dev/null +++ b/drivers/video/dw_mipi_dsi.c @@ -0,0 +1,822 @@ +/* + * Copyright (C) 2016, Fuzhou Rockchip Electronics Co., Ltd + * Copyright (C) 2018, STMicroelectronics - All Rights Reserved + * Author(s): Philippe Cornu philippe.cornu@st.com for STMicroelectronics. + * Yannick Fertre yannick.fertre@st.com for STMicroelectronics. + * + * Modified by Yannick Fertre yannick.fertre@st.com + * This generic Synopsys DesignWare MIPI DSI host driver is based on the + * bridge synopsys from drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c (kernel + * linux). + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <errno.h> +#include <mipi_display.h> +#include <panel.h> +#include <video.h> +#include <asm/io.h> +#include <asm/arch/gpio.h> +#include <dm/device-internal.h> +#include <dw_mipi_dsi.h> +#include <linux/iopoll.h> +#include <video_bridge.h> + +#define HWVER_131 0x31333100 /* IP version 1.31 */ + +#define DSI_VERSION 0x00 +#define VERSION GENMASK(31, 8) + +#define DSI_PWR_UP 0x04 +#define RESET 0 +#define POWERUP BIT(0) + +#define DSI_CLKMGR_CFG 0x08 +#define TO_CLK_DIVISION(div) (((div) & 0xff) << 8) +#define TX_ESC_CLK_DIVISION(div) ((div) & 0xff) + +#define DSI_DPI_VCID 0x0c +#define DPI_VCID(vcid) ((vcid) & 0x3) + +#define DSI_DPI_COLOR_CODING 0x10 +#define LOOSELY18_EN BIT(8) +#define DPI_COLOR_CODING_16BIT_1 0x0 +#define DPI_COLOR_CODING_16BIT_2 0x1 +#define DPI_COLOR_CODING_16BIT_3 0x2 +#define DPI_COLOR_CODING_18BIT_1 0x3 +#define DPI_COLOR_CODING_18BIT_2 0x4 +#define DPI_COLOR_CODING_24BIT 0x5 + +#define DSI_DPI_CFG_POL 0x14 +#define COLORM_ACTIVE_LOW BIT(4) +#define SHUTD_ACTIVE_LOW BIT(3) +#define HSYNC_ACTIVE_LOW BIT(2) +#define VSYNC_ACTIVE_LOW BIT(1) +#define DATAEN_ACTIVE_LOW BIT(0) + +#define DSI_DPI_LP_CMD_TIM 0x18 +#define OUTVACT_LPCMD_TIME(p) (((p) & 0xff) << 16) +#define INVACT_LPCMD_TIME(p) ((p) & 0xff) + +#define DSI_DBI_VCID 0x1c +#define DSI_DBI_CFG 0x20 +#define DSI_DBI_PARTITIONING_EN 0x24 +#define DSI_DBI_CMDSIZE 0x28 + +#define DSI_PCKHDL_CFG 0x2c +#define CRC_RX_EN BIT(4) +#define ECC_RX_EN BIT(3) +#define BTA_EN BIT(2) +#define EOTP_RX_EN BIT(1) +#define EOTP_TX_EN BIT(0) + +#define DSI_GEN_VCID 0x30 + +#define DSI_MODE_CFG 0x34 +#define ENABLE_VIDEO_MODE 0 +#define ENABLE_CMD_MODE BIT(0) + +#define DSI_VID_MODE_CFG 0x38 +#define ENABLE_LOW_POWER (0x3f << 8) +#define ENABLE_LOW_POWER_MASK (0x3f << 8) +#define VID_MODE_TYPE_NON_BURST_SYNC_PULSES 0x0 +#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS 0x1 +#define VID_MODE_TYPE_BURST 0x2 +#define VID_MODE_TYPE_MASK 0x3 + +#define DSI_VID_PKT_SIZE 0x3c +#define VID_PKT_SIZE(p) ((p) & 0x3fff) + +#define DSI_VID_NUM_CHUNKS 0x40 +#define VID_NUM_CHUNKS(c) ((c) & 0x1fff) + +#define DSI_VID_NULL_SIZE 0x44 +#define VID_NULL_SIZE(b) ((b) & 0x1fff) + +#define DSI_VID_HSA_TIME 0x48 +#define DSI_VID_HBP_TIME 0x4c +#define DSI_VID_HLINE_TIME 0x50 +#define DSI_VID_VSA_LINES 0x54 +#define DSI_VID_VBP_LINES 0x58 +#define DSI_VID_VFP_LINES 0x5c +#define DSI_VID_VACTIVE_LINES 0x60 +#define DSI_EDPI_CMD_SIZE 0x64 + +#define DSI_CMD_MODE_CFG 0x68 +#define MAX_RD_PKT_SIZE_LP BIT(24) +#define DCS_LW_TX_LP BIT(19) +#define DCS_SR_0P_TX_LP BIT(18) +#define DCS_SW_1P_TX_LP BIT(17) +#define DCS_SW_0P_TX_LP BIT(16) +#define GEN_LW_TX_LP BIT(14) +#define GEN_SR_2P_TX_LP BIT(13) +#define GEN_SR_1P_TX_LP BIT(12) +#define GEN_SR_0P_TX_LP BIT(11) +#define GEN_SW_2P_TX_LP BIT(10) +#define GEN_SW_1P_TX_LP BIT(9) +#define GEN_SW_0P_TX_LP BIT(8) +#define ACK_RQST_EN BIT(1) +#define TEAR_FX_EN BIT(0) + +#define CMD_MODE_ALL_LP (MAX_RD_PKT_SIZE_LP | \ + DCS_LW_TX_LP | \ + DCS_SR_0P_TX_LP | \ + DCS_SW_1P_TX_LP | \ + DCS_SW_0P_TX_LP | \ + GEN_LW_TX_LP | \ + GEN_SR_2P_TX_LP | \ + GEN_SR_1P_TX_LP | \ + GEN_SR_0P_TX_LP | \ + GEN_SW_2P_TX_LP | \ + GEN_SW_1P_TX_LP | \ + GEN_SW_0P_TX_LP) + +#define DSI_GEN_HDR 0x6c +#define DSI_GEN_PLD_DATA 0x70 + +#define DSI_CMD_PKT_STATUS 0x74 +#define GEN_RD_CMD_BUSY BIT(6) +#define GEN_PLD_R_FULL BIT(5) +#define GEN_PLD_R_EMPTY BIT(4) +#define GEN_PLD_W_FULL BIT(3) +#define GEN_PLD_W_EMPTY BIT(2) +#define GEN_CMD_FULL BIT(1) +#define GEN_CMD_EMPTY BIT(0) + +#define DSI_TO_CNT_CFG 0x78 +#define HSTX_TO_CNT(p) (((p) & 0xffff) << 16) +#define LPRX_TO_CNT(p) ((p) & 0xffff) + +#define DSI_HS_RD_TO_CNT 0x7c +#define DSI_LP_RD_TO_CNT 0x80 +#define DSI_HS_WR_TO_CNT 0x84 +#define DSI_LP_WR_TO_CNT 0x88 +#define DSI_BTA_TO_CNT 0x8c + +#define DSI_LPCLK_CTRL 0x94 +#define AUTO_CLKLANE_CTRL BIT(1) +#define PHY_TXREQUESTCLKHS BIT(0) + +#define DSI_PHY_TMR_LPCLK_CFG 0x98 +#define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16) +#define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff) + +#define DSI_PHY_TMR_CFG 0x9c +#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24) +#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16) +#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff) +#define PHY_HS2LP_TIME_V131(lbcc) (((lbcc) & 0x3ff) << 16) +#define PHY_LP2HS_TIME_V131(lbcc) ((lbcc) & 0x3ff) + +#define DSI_PHY_RSTZ 0xa0 +#define PHY_DISFORCEPLL 0 +#define PHY_ENFORCEPLL BIT(3) +#define PHY_DISABLECLK 0 +#define PHY_ENABLECLK BIT(2) +#define PHY_RSTZ 0 +#define PHY_UNRSTZ BIT(1) +#define PHY_SHUTDOWNZ 0 +#define PHY_UNSHUTDOWNZ BIT(0) + +#define DSI_PHY_IF_CFG 0xa4 +#define PHY_STOP_WAIT_TIME(cycle) (((cycle) & 0xff) << 8) +#define N_LANES(n) (((n) - 1) & 0x3) + +#define DSI_PHY_ULPS_CTRL 0xa8 +#define DSI_PHY_TX_TRIGGERS 0xac + +#define DSI_PHY_STATUS 0xb0 +#define PHY_STOP_STATE_CLK_LANE BIT(2) +#define PHY_LOCK BIT(0) + +#define DSI_PHY_TST_CTRL0 0xb4 +#define PHY_TESTCLK BIT(1) +#define PHY_UNTESTCLK 0 +#define PHY_TESTCLR BIT(0) +#define PHY_UNTESTCLR 0 + +#define DSI_PHY_TST_CTRL1 0xb8 +#define PHY_TESTEN BIT(16) +#define PHY_UNTESTEN 0 +#define PHY_TESTDOUT(n) (((n) & 0xff) << 8) +#define PHY_TESTDIN(n) ((n) & 0xff) + +#define DSI_INT_ST0 0xbc +#define DSI_INT_ST1 0xc0 +#define DSI_INT_MSK0 0xc4 +#define DSI_INT_MSK1 0xc8 + +#define DSI_PHY_TMR_RD_CFG 0xf4 +#define MAX_RD_TIME_V131(lbcc) ((lbcc) & 0x7fff) + +#define PHY_STATUS_TIMEOUT_US 10000 +#define CMD_PKT_STATUS_TIMEOUT_US 20000 + +#define MSEC_PER_SEC 1000 + +struct dw_mipi_dsi { + struct mipi_dsi_host dsi_host; + struct mipi_dsi_device *device; + void __iomem *base; + unsigned int lane_mbps; /* per lane */ + u32 channel; + u32 lanes; + u32 format; + unsigned long mode_flags; + unsigned int max_data_lanes; + const struct dw_mipi_dsi_phy_ops *phy_ops; +}; + +static int dsi_mode_vrefresh(struct display_timing *timings) +{ + int refresh = 0; + unsigned int calc_val; + u32 htotal = timings->hactive.typ + timings->hfront_porch.typ + + timings->hback_porch.typ + timings->hsync_len.typ; + u32 vtotal = timings->vactive.typ + timings->vfront_porch.typ + + timings->vback_porch.typ + timings->vsync_len.typ; + + if (htotal > 0 && vtotal > 0) { + calc_val = timings->pixelclock.typ; + calc_val /= htotal; + refresh = (calc_val + vtotal / 2) / vtotal; + } + + return refresh; +} + +/* + * The controller should generate 2 frames before + * preparing the peripheral. + */ +static void dw_mipi_dsi_wait_for_two_frames(struct display_timing *timings) +{ + int refresh, two_frames; + + refresh = dsi_mode_vrefresh(timings); + two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2; + mdelay(two_frames); +} + +static inline struct dw_mipi_dsi *host_to_dsi(struct mipi_dsi_host *host) +{ + return container_of(host, struct dw_mipi_dsi, dsi_host); +} + +static inline void dsi_write(struct dw_mipi_dsi *dsi, u32 reg, u32 val) +{ + writel(val, dsi->base + reg); +} + +static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg) +{ + return readl(dsi->base + reg); +} + +static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host, + struct mipi_dsi_device *device) +{ + struct dw_mipi_dsi *dsi = host_to_dsi(host); + + if (device->lanes > dsi->max_data_lanes) { + debug("the number of data lanes(%u) is too many\n", + device->lanes); + return -EINVAL; + } + + dsi->lanes = device->lanes; + dsi->channel = device->channel; + dsi->format = device->format; + dsi->mode_flags = device->mode_flags; + + return 0; +} + +static void dw_mipi_message_config(struct dw_mipi_dsi *dsi, + const struct mipi_dsi_msg *msg) +{ + bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM; + u32 val = 0; + + if (msg->flags & MIPI_DSI_MSG_REQ_ACK) + val |= ACK_RQST_EN; + if (lpm) + val |= CMD_MODE_ALL_LP; + + dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS); + dsi_write(dsi, DSI_CMD_MODE_CFG, val); +} + +static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val) +{ + int ret; + u32 val, mask; + + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_CMD_FULL), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret < 0) { + debug("failed to get available command FIFO\n"); + return ret; + } + + dsi_write(dsi, DSI_GEN_HDR, hdr_val); + + mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY; + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, (val & mask) == mask, + CMD_PKT_STATUS_TIMEOUT_US); + if (ret < 0) { + debug("failed to write command FIFO\n"); + return ret; + } + + return 0; +} + +static int dw_mipi_dsi_write(struct dw_mipi_dsi *dsi, + const struct mipi_dsi_packet *packet) +{ + const u8 *tx_buf = packet->payload; + int len = packet->payload_length, pld_data_bytes = sizeof(u32), ret; + __le32 word; + u32 val; + + while (len) { + if (len < pld_data_bytes) { + word = 0; + memcpy(&word, tx_buf, len); + dsi_write(dsi, DSI_GEN_PLD_DATA, le32_to_cpu(word)); + len = 0; + } else { + memcpy(&word, tx_buf, pld_data_bytes); + dsi_write(dsi, DSI_GEN_PLD_DATA, le32_to_cpu(word)); + tx_buf += pld_data_bytes; + len -= pld_data_bytes; + } + + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_PLD_W_FULL), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret < 0) { + dev_err(dsi->dev, + "failed to get available write payload FIFO\n"); + return ret; + } + } + + word = 0; + memcpy(&word, packet->header, sizeof(packet->header)); + return dw_mipi_dsi_gen_pkt_hdr_write(dsi, le32_to_cpu(word)); +} + +static int dw_mipi_dsi_read(struct dw_mipi_dsi *dsi, + const struct mipi_dsi_msg *msg) +{ + int i, j, ret, len = msg->rx_len; + u8 *buf = msg->rx_buf; + u32 val; + + /* Wait end of the read operation */ + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_RD_CMD_BUSY), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret) { + dev_err(dsi->dev, "Timeout during read operation\n"); + return ret; + } + + for (i = 0; i < len; i += 4) { + /* Read fifo must not be empty before all bytes are read */ + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS, + val, !(val & GEN_PLD_R_EMPTY), + CMD_PKT_STATUS_TIMEOUT_US); + if (ret) { + dev_err(dsi->dev, "Read payload FIFO is empty\n"); + return ret; + } + + val = dsi_read(dsi, DSI_GEN_PLD_DATA); + for (j = 0; j < 4 && j + i < len; j++) + buf[i + j] = val >> (8 * j); + } + + return ret; +} + +static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host, + const struct mipi_dsi_msg *msg) +{ + struct dw_mipi_dsi *dsi = host_to_dsi(host); + struct mipi_dsi_packet packet; + int ret, nb_bytes; + + ret = mipi_dsi_create_packet(&packet, msg); + if (ret) { + dev_err(dsi->dev, "failed to create packet: %d\n", ret); + return ret; + } + + dw_mipi_message_config(dsi, msg); + + ret = dw_mipi_dsi_write(dsi, &packet); + if (ret) + return ret; + + if (msg->rx_buf && msg->rx_len) { + ret = dw_mipi_dsi_read(dsi, msg); + if (ret) + return ret; + nb_bytes = msg->rx_len; + } else { + nb_bytes = packet.size; + } + + return nb_bytes; +} + +static const struct mipi_dsi_host_ops dw_mipi_dsi_host_ops = { + .attach = dw_mipi_dsi_host_attach, + .transfer = dw_mipi_dsi_host_transfer, +}; + +static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi) +{ + u32 val; + + /* + * TODO dw drv improvements + * enabling low power is panel-dependent, we should use the + * panel configuration here... + */ + val = ENABLE_LOW_POWER; + + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) + val |= VID_MODE_TYPE_BURST; + else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) + val |= VID_MODE_TYPE_NON_BURST_SYNC_PULSES; + else + val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS; + + dsi_write(dsi, DSI_VID_MODE_CFG, val); +} + +static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi, + unsigned long mode_flags) +{ + dsi_write(dsi, DSI_PWR_UP, RESET); + + if (mode_flags & MIPI_DSI_MODE_VIDEO) { + dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE); + dw_mipi_dsi_video_mode_config(dsi); + dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS); + } else { + dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE); + } + + dsi_write(dsi, DSI_PWR_UP, POWERUP); +} + +static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi) +{ + /* + * The maximum permitted escape clock is 20MHz and it is derived from + * lanebyteclk, which is running at "lane_mbps / 8". Thus we want: + * + * (lane_mbps >> 3) / esc_clk_division < 20 + * which is: + * (lane_mbps >> 3) / 20 > esc_clk_division + */ + u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1; + + dsi_write(dsi, DSI_PWR_UP, RESET); + + /* + * TODO dw drv improvements + * timeout clock division should be computed with the + * high speed transmission counter timeout and byte lane... + */ + dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVISION(10) | + TX_ESC_CLK_DIVISION(esc_clk_division)); +} + +static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + u32 val = 0, color = 0; + + switch (dsi->format) { + case MIPI_DSI_FMT_RGB888: + color = DPI_COLOR_CODING_24BIT; + break; + case MIPI_DSI_FMT_RGB666: + color = DPI_COLOR_CODING_18BIT_2 | LOOSELY18_EN; + break; + case MIPI_DSI_FMT_RGB666_PACKED: + color = DPI_COLOR_CODING_18BIT_1; + break; + case MIPI_DSI_FMT_RGB565: + color = DPI_COLOR_CODING_16BIT_1; + break; + } + + if (dsi->mode_flags & DISPLAY_FLAGS_VSYNC_HIGH) + val |= VSYNC_ACTIVE_LOW; + if (dsi->mode_flags & DISPLAY_FLAGS_HSYNC_HIGH) + val |= HSYNC_ACTIVE_LOW; + + dsi_write(dsi, DSI_DPI_VCID, DPI_VCID(dsi->channel)); + dsi_write(dsi, DSI_DPI_COLOR_CODING, color); + dsi_write(dsi, DSI_DPI_CFG_POL, val); + /* + * TODO dw drv improvements + * largest packet sizes during hfp or during vsa/vpb/vfp + * should be computed according to byte lane, lane number and only + * if sending lp cmds in high speed is enable (PHY_TXREQUESTCLKHS) + */ + dsi_write(dsi, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4) + | INVACT_LPCMD_TIME(4)); +} + +static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi) +{ + dsi_write(dsi, DSI_PCKHDL_CFG, CRC_RX_EN | ECC_RX_EN | BTA_EN); +} + +static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + /* + * TODO dw drv improvements + * only burst mode is supported here. For non-burst video modes, + * we should compute DSI_VID_PKT_SIZE, DSI_VCCR.NUMC & + * DSI_VNPCR.NPSIZE... especially because this driver supports + * non-burst video modes, see dw_mipi_dsi_video_mode_config()... + */ + dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(timings->hactive.typ)); +} + +static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi) +{ + /* + * TODO dw drv improvements + * compute high speed transmission counter timeout according + * to the timeout clock division (TO_CLK_DIVISION) and byte lane... + */ + dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000)); + /* + * TODO dw drv improvements + * the Bus-Turn-Around Timeout Counter should be computed + * according to byte lane... + */ + dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00); + dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE); +} + +/* Get lane byte clock cycles. */ +static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi, + struct display_timing *timings, + u32 hcomponent) +{ + u32 frac, lbcc; + + lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8; + + frac = lbcc % (timings->pixelclock.typ / 1000); + lbcc = lbcc / (timings->pixelclock.typ / 1000); + if (frac) + lbcc++; + + return lbcc; +} + +static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + u32 htotal, hsa, hbp, lbcc; + + htotal = timings->hactive.typ + timings->hfront_porch.typ + + timings->hback_porch.typ + timings->hsync_len.typ; + + hsa = timings->hback_porch.typ; + hbp = timings->hsync_len.typ; + + /* + * TODO dw drv improvements + * computations below may be improved... + */ + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, timings, htotal); + dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc); + + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, timings, hsa); + dsi_write(dsi, DSI_VID_HSA_TIME, lbcc); + + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, timings, hbp); + dsi_write(dsi, DSI_VID_HBP_TIME, lbcc); +} + +static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + u32 vactive, vsa, vfp, vbp; + + vactive = timings->vactive.typ; + vsa = timings->vback_porch.typ; + vfp = timings->vfront_porch.typ; + vbp = timings->vsync_len.typ; + + dsi_write(dsi, DSI_VID_VACTIVE_LINES, vactive); + dsi_write(dsi, DSI_VID_VSA_LINES, vsa); + dsi_write(dsi, DSI_VID_VFP_LINES, vfp); + dsi_write(dsi, DSI_VID_VBP_LINES, vbp); +} + +static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi) +{ + u32 hw_version; + + /* + * TODO dw drv improvements + * data & clock lane timers should be computed according to panel + * blankings and to the automatic clock lane control mode... + * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with + * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP) + */ + + hw_version = dsi_read(dsi, DSI_VERSION) & VERSION; + + if (hw_version >= HWVER_131) { + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) | + PHY_LP2HS_TIME_V131(0x40)); + dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000)); + } else { + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40) | + PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000)); + } + + dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40) + | PHY_CLKLP2HS_TIME(0x40)); +} + +static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi) +{ + /* + * TODO dw drv improvements + * stop wait time should be the maximum between host dsi + * and panel stop wait times + */ + dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) | + N_LANES(dsi->lanes)); +} + +static void dw_mipi_dsi_dphy_init(struct dw_mipi_dsi *dsi) +{ + /* Clear PHY state */ + dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK + | PHY_RSTZ | PHY_SHUTDOWNZ); + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR); + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR); + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR); +} + +static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi) +{ + u32 val; + int ret; + + dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK | + PHY_UNRSTZ | PHY_UNSHUTDOWNZ); + + ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS, val, + val & PHY_LOCK, PHY_STATUS_TIMEOUT_US); + if (ret < 0) + debug("failed to wait phy lock state\n"); + + ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS, + val, val & PHY_STOP_STATE_CLK_LANE, + PHY_STATUS_TIMEOUT_US); + if (ret < 0) + debug("failed to wait phy clk lane stop state\n"); +} + +static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi) +{ + dsi_read(dsi, DSI_INT_ST0); + dsi_read(dsi, DSI_INT_ST1); + dsi_write(dsi, DSI_INT_MSK0, 0); + dsi_write(dsi, DSI_INT_MSK1, 0); +} + +static void dw_mipi_dsi_bridge_set(struct dw_mipi_dsi *dsi, + struct display_timing *timings) +{ + const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->phy_ops; + int ret; + + ret = phy_ops->get_lane_mbps(dsi->device, timings, dsi->lanes, + dsi->format, &dsi->lane_mbps); + if (ret) + debug("Phy get_lane_mbps() failed\n"); + + dw_mipi_dsi_init(dsi); + dw_mipi_dsi_dpi_config(dsi, timings); + dw_mipi_dsi_packet_handler_config(dsi); + dw_mipi_dsi_video_mode_config(dsi); + dw_mipi_dsi_video_packet_config(dsi, timings); + dw_mipi_dsi_command_mode_config(dsi); + dw_mipi_dsi_line_timer_config(dsi, timings); + dw_mipi_dsi_vertical_timing_config(dsi, timings); + + dw_mipi_dsi_dphy_init(dsi); + dw_mipi_dsi_dphy_timing_config(dsi); + dw_mipi_dsi_dphy_interface_config(dsi); + + dw_mipi_dsi_clear_err(dsi); + + ret = phy_ops->init(dsi->device); + if (ret) + debug("Phy init() failed\n"); + + dw_mipi_dsi_dphy_enable(dsi); + + dw_mipi_dsi_wait_for_two_frames(timings); + + /* Switch to cmd mode for panel-bridge pre_enable & panel prepare */ + dw_mipi_dsi_set_mode(dsi, 0); +} + +void dw_mipi_dsi_bridge_enable(struct mipi_dsi_device *device) +{ + struct mipi_dsi_host *host = device->host; + struct dw_mipi_dsi *dsi = host_to_dsi(host); + + /* Switch to video mode for panel-bridge enable & panel enable */ + dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO); +} +EXPORT_SYMBOL_GPL(dw_mipi_dsi_bridge_enable); + +int dw_mipi_dsi_init_bridge(struct mipi_dsi_device *device) +{ + struct dw_mipi_dsi_plat_data *platdata = dev_get_platdata(device->dev); + struct display_timing timings; + struct dw_mipi_dsi *dsi; + struct clk clk; + int ret; + + dsi = kzalloc(sizeof(*dsi), GFP_KERNEL); + + dsi->phy_ops = platdata->phy_ops; + dsi->max_data_lanes = platdata->max_data_lanes; + dsi->device = device; + dsi->dsi_host.ops = &dw_mipi_dsi_host_ops; + device->host = &dsi->dsi_host; + + /* TODO Get these settings from panel */ + dsi->lanes = 2; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | + MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_LPM; + + dsi->base = (void *)dev_read_addr(device->dev); + if ((fdt_addr_t)dsi->base == FDT_ADDR_T_NONE) { + debug("%s: dsi dt register address error\n", __func__); + return -EINVAL; + } + + ret = fdtdec_decode_display_timing(gd->fdt_blob, + dev_of_offset(platdata->panel), + 0, &timings); + if (ret) { + debug("%s: decode display timing error %d\n", __func__, ret); + return ret; + } + + if (!dsi->phy_ops->init || !dsi->phy_ops->get_lane_mbps) { + debug("Phy not properly configured\n"); + return -ENODEV; + } + + ret = clk_get_by_name(device->dev, "px_clk", &clk); + if (ret) { + debug("%s: peripheral clock get error %d\n", __func__, ret); + return ret; + } + + /* get the pixel clock set by the clock framework */ + timings.pixelclock.typ = clk_get_rate(&clk); + + dw_mipi_dsi_bridge_set(dsi, &timings); + + return 0; +} +EXPORT_SYMBOL_GPL(dw_mipi_dsi_init_bridge); + +MODULE_AUTHOR("Chris Zhong zyw@rock-chips.com"); +MODULE_AUTHOR("Philippe Cornu philippe.cornu@st.com"); +MODULE_AUTHOR("Yannick Fertré yannick.fertre@st.com"); +MODULE_DESCRIPTION("DW MIPI DSI host controller driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:dw-mipi-dsi"); diff --git a/include/dw_mipi_dsi.h b/include/dw_mipi_dsi.h new file mode 100644 index 0000000..8c33ec2 --- /dev/null +++ b/include/dw_mipi_dsi.h @@ -0,0 +1,32 @@ +/* + * Copyright (C) 2017-2018, STMicroelectronics - All Rights Reserved + * + * Authors: Yannick Fertre yannick.fertre@st.com + * Philippe Cornu philippe.cornu@st.com + * + * Modified by Yannick Fertre yannick.fertre@st.com + * This generic Synopsys DesignWare MIPI DSI host driver is based on the + * bridge synopsys from include/drm/bridge/dw_mipi_dsi.h (kernel linux). + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#ifndef __DW_MIPI_DSI__ +#define __DW_MIPI_DSI__ + +struct dw_mipi_dsi_phy_ops { + int (*init)(void *priv_data); + int (*get_lane_mbps)(void *priv_data, struct display_timing *timings, + u32 lanes, u32 format, unsigned int *lane_mbps); +}; + +struct dw_mipi_dsi_plat_data { + unsigned int max_data_lanes; + const struct dw_mipi_dsi_phy_ops *phy_ops; + struct udevice *panel; +}; + +int dw_mipi_dsi_init_bridge(struct mipi_dsi_device *device); +void dw_mipi_dsi_bridge_enable(struct mipi_dsi_device *device); + +#endif /* __DW_MIPI_DSI__ */

Add mipi dsi bridge node in device-tree.

Signed-off-by: yannick fertre yannick.fertre@st.com --- arch/arm/dts/stm32f746.dtsi | 12 ++++++++++++ 1 file changed, 12 insertions(+)

diff --git a/arch/arm/dts/stm32f746.dtsi b/arch/arm/dts/stm32f746.dtsi index e4d32bf..4ec954d 100644 --- a/arch/arm/dts/stm32f746.dtsi +++ b/arch/arm/dts/stm32f746.dtsi @@ -332,6 +332,18 @@ u-boot,dm-pre-reloc; status = "disabled"; }; + + dsi: dsi@40016c00 { + compatible = "st,stm32-dsi"; + reg = <0x40016C00 0x800>; + resets = <&rcc STM32F7_APB2_RESET(DSI)>; + clocks = <&rcc 0 STM32F7_APB2_CLOCK(DSI)>, + <&rcc 0 STM32F7_APB2_CLOCK(LTDC)>, + <&clk_hse>; + clock-names = "pclk", "px_clk", "ref"; + u-boot,dm-pre-reloc; + status = "disabled"; + }; }; };