Not really qcom specific, but for now qcom/lk is the one firmware that is (afaiu) setting up the appropriate dt node for pre-configured display. Uses the generic simple-framebuffer DT bindings so this should be useful on other platforms.
Signed-off-by: Rob Clark robdclark@gmail.com --- drivers/video/Kconfig | 10 +++++++ drivers/video/Makefile | 2 +- drivers/video/simplefb.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 79 insertions(+), 1 deletion(-) create mode 100644 drivers/video/simplefb.c
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 61dfed8..8eb0359 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -628,4 +628,14 @@ 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_SIMPLE + bool "Simple display driver for preconfigured display" + help + Enables a simple generic display driver which utilizes the + simple-framebuffer devicetree bindings. + + This driver assumes that the display hardware has been initialized + before u-boot starts, and u-boot will simply render to the pre- + allocated frame buffer surface. + endmenu diff --git a/drivers/video/Makefile b/drivers/video/Makefile index ac5371f..52f50f6 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -57,7 +57,7 @@ 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-$(CONFIG_VIDEO_SIMPLE) += simplefb.o obj-${CONFIG_VIDEO_TEGRA124} += tegra124/ obj-${CONFIG_EXYNOS_FB} += exynos/ obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/ diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c new file mode 100644 index 0000000..7c3e8e5 --- /dev/null +++ b/drivers/video/simplefb.c @@ -0,0 +1,68 @@ +/* + * (C) Copyright 2017 Rob Clark + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <fdtdec.h> +#include <fdt_support.h> +#include <video.h> + +static int simple_video_probe(struct udevice *dev) +{ + struct video_uc_platdata *plat = dev_get_uclass_platdata(dev); + struct video_priv *uc_priv = dev_get_uclass_priv(dev); + const void *blob = gd->fdt_blob; + const int node = dev_of_offset(dev); + const char *format; + fdt_addr_t base, size; + + if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { + debug("%s: Failed to decode memory region\n", __func__); + return -EINVAL; + } + + debug("%s: base=%llx, size=%llu\n", __func__, base, size); + + // TODO is there some way to reserve the framebuffer + // region so it isn't clobbered? + plat->base = base; + plat->size = size; + + video_set_flush_dcache(dev, true); + + debug("%s: Query resolution...\n", __func__); + + uc_priv->xsize = fdtdec_get_uint(blob, node, "width", 0); + uc_priv->ysize = fdtdec_get_uint(blob, node, "height", 0); + uc_priv->rot = 0; + + format = fdt_getprop(blob, node, "format", NULL); + debug("%s: %dx%d@%s\n", __func__, uc_priv->xsize, uc_priv->ysize, format); + + if (strcmp(format, "r5g6b5") == 0) { + uc_priv->bpix = VIDEO_BPP16; + } else if (strcmp(format, "a8b8g8r8") == 0) { + uc_priv->bpix = VIDEO_BPP32; + } else { + printf("%s: invalid format: %s\n", __func__, format); + return -EINVAL; + } + + return 0; +} + +static const struct udevice_id simple_video_ids[] = { + { .compatible = "simple-framebuffer" }, + { } +}; + +U_BOOT_DRIVER(simple_video) = { + .name = "simple_video", + .id = UCLASS_VIDEO, + .of_match = simple_video_ids, + .probe = simple_video_probe, + .flags = DM_FLAG_PRE_RELOC, +};