Since the used AM3352 SoC doesn't have GPU it isn't allways necessary to build in complete drm-stuff into linux kernel. In very small applications only we use the simple-framebuffer.
So we have 2 use-cases: - device operating on drm-driver (let simplefb node disabled) - device operating on simplefb-driver (activate simplefb node and reserve mem)
The decision is made by means of "simplefb" environment variable.
simplefb = 0 we don't enable the (maybe) existing simplefb node and all the rest around display is up to the linux-kernel. We just disable the backlight, beceause we do not want see the flicker during take over of drm-driver.
simplefb = 1 we enable the (maybe) existing simplefb node and reserve framebuffers size in memory.
Signed-off-by: Hannes Petermaier oe5hpm@oevsv.at ---
board/BuR/common/common.c | 134 +++++++++++++++++++++++++++++---------------- include/configs/tseries.h | 4 ++ 2 files changed, 90 insertions(+), 48 deletions(-)
diff --git a/board/BuR/common/common.c b/board/BuR/common/common.c index 3036f86..5b356fb 100644 --- a/board/BuR/common/common.c +++ b/board/BuR/common/common.c @@ -34,6 +34,7 @@ #include "bur_common.h" #include "../../../drivers/video/am335x-fb.h" #include <nand.h> +#include <fdt_simplefb.h>
static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
@@ -47,6 +48,64 @@ DECLARE_GLOBAL_DATA_PTR; /* --------------------------------------------------------------------------*/ #if defined(CONFIG_LCD) && defined(CONFIG_AM335X_LCD) && \ !defined(CONFIG_SPL_BUILD) +void lcdbacklight(int on) +{ +#ifdef CONFIG_USE_FDT + if (gd->fdt_blob == NULL) { + printf("%s: don't have a valid gd->fdt_blob!\n", __func__); + return; + } + unsigned int driver = FDTPROP(PATHINF, "brightdrv"); + unsigned int bright = FDTPROP(PATHINF, "brightdef"); + unsigned int pwmfrq = FDTPROP(PATHINF, "brightfdim"); +#else + unsigned int driver = getenv_ulong("ds1_bright_drv", 16, 0UL); + unsigned int bright = getenv_ulong("ds1_bright_def", 10, 50); + unsigned int pwmfrq = getenv_ulong("ds1_pwmfreq", 10, ~0UL); +#endif + unsigned int tmp; + + struct gptimer *const timerhw = (struct gptimer *)DM_TIMER6_BASE; + + if (on) + bright = bright != ~0UL ? bright : 50; + else + bright = 0; + + switch (driver) { + case 0: /* PMIC LED-Driver */ + /* brightness level */ + tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, + TPS65217_WLEDCTRL2, bright, 0xFF); + /* current sink */ + tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, + TPS65217_WLEDCTRL1, + bright != 0 ? 0x0A : 0x02, + 0xFF); + break; + case 1: /* PWM using timer6 */ + if (pwmfrq != ~0UL) { + timerhw->tiocp_cfg = TCFG_RESET; + udelay(10); + while (timerhw->tiocp_cfg & TCFG_RESET) + ; + tmp = ~0UL-(V_OSCK/pwmfrq); /* bottom value */ + timerhw->tldr = tmp; + timerhw->tcrr = tmp; + tmp = tmp + ((V_OSCK/pwmfrq)/100) * bright; + timerhw->tmar = tmp; + timerhw->tclr = (TCLR_PT | (2 << TCLR_TRG_SHIFT) | + TCLR_CE | TCLR_AR | TCLR_ST); + } else { + puts("invalid pwmfrq in env/dtb! skip PWM-setup.\n"); + } + break; + default: + puts("no suitable backlightdriver in env/dtb!\n"); + break; + } +} + int load_lcdtiming(struct am335x_lcdpanel *panel) { struct am335x_lcdpanel pnltmp; @@ -304,6 +363,32 @@ int ft_board_setup(void *blob, bd_t *bd) puts("set bootloader version 'bl-version' prop. not in dtb!\n"); return -1; } + /* + * if no simplefb is requested through environment, we don't set up + * one, instead we turn off backlight. + */ + if (getenv_ulong("simplefb", 10, 0) == 0) { + lcdbacklight(0); + return 0; + } + /* Setup simplefb devicetree node, also adapt memory-node, + * upper limit for kernel e.g. linux is memtop-framebuffer alligned + * to a full megabyte. + */ + u64 start = gd->bd->bi_dram[0].start; + u64 size = (gd->fb_base - start) & ~0xFFFFF; + int rc = fdt_fixup_memory_banks(blob, &start, &size, 1); + + if (rc) { + puts("cannot setup simplefb: Error reserving memory!\n"); + return rc; + } + rc = lcd_dt_simplefb_enable_existing_node(blob); + if (rc) { + puts("cannot setup simplefb: error enabling simplefb node!\n"); + return rc; + } + return 0; } #else @@ -412,55 +497,8 @@ void lcd_ctrl_init(void *lcdbase)
void lcd_enable(void) { -#ifdef CONFIG_USE_FDT - if (gd->fdt_blob == NULL) { - printf("%s: don't have a valid gd->fdt_blob!\n", __func__); - return; - } - unsigned int driver = FDTPROP(PATHINF, "brightdrv"); - unsigned int bright = FDTPROP(PATHINF, "brightdef"); - unsigned int pwmfrq = FDTPROP(PATHINF, "brightfdim"); -#else - unsigned int driver = getenv_ulong("ds1_bright_drv", 16, 0UL); - unsigned int bright = getenv_ulong("ds1_bright_def", 10, 50); - unsigned int pwmfrq = getenv_ulong("ds1_pwmfreq", 10, ~0UL); -#endif - unsigned int tmp; - struct gptimer *const timerhw = (struct gptimer *)DM_TIMER6_BASE; - - bright = bright != ~0UL ? bright : 50; - - switch (driver) { - case 0: /* PMIC LED-Driver */ - /* brightness level */ - tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, - TPS65217_WLEDCTRL2, bright, 0xFF); - /* turn on light */ - tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, - TPS65217_WLEDCTRL1, 0x0A, 0xFF); - break; - case 1: /* PWM using timer6 */ - if (pwmfrq != ~0UL) { - timerhw->tiocp_cfg = TCFG_RESET; - udelay(10); - while (timerhw->tiocp_cfg & TCFG_RESET) - ; - tmp = ~0UL-(V_OSCK/pwmfrq); /* bottom value */ - timerhw->tldr = tmp; - timerhw->tcrr = tmp; - tmp = tmp + ((V_OSCK/pwmfrq)/100) * bright; - timerhw->tmar = tmp; - timerhw->tclr = (TCLR_PT | (2 << TCLR_TRG_SHIFT) | - TCLR_CE | TCLR_AR | TCLR_ST); - } else { - puts("invalid pwmfrq in env/dtb! skip PWM-setup.\n"); - } - break; - default: - puts("no suitable backlightdriver in env/dtb!\n"); - break; - } br_summaryscreen(); + lcdbacklight(1); } #elif CONFIG_SPL_BUILD #else diff --git a/include/configs/tseries.h b/include/configs/tseries.h index f2df358..c58403f 100644 --- a/include/configs/tseries.h +++ b/include/configs/tseries.h @@ -17,6 +17,7 @@ #define CONFIG_AM335X_LCD #define CONFIG_LCD #define CONFIG_LCD_ROTATION +#define CONFIG_LCD_DT_SIMPLEFB #define CONFIG_SYS_WHITE_ON_BLACK #define LCD_BPP LCD_COLOR32
@@ -115,6 +116,7 @@ "bootz ${loadaddr} - ${dtbaddr}\0" \ "defboot=run nandboot\0" \ "bootlimit=1\0" \ + "simplefb=1\0 " \ "altbootcmd=run usbscript\0" #else #define NANDARGS "" @@ -132,10 +134,12 @@ "mmcroot1=setenv bootargs ${optargs_rot} ${optargs} console=${console} " \ "root=/dev/mmcblk0p2 rootfstype=ext4\0" \ "mmcboot0=echo booting Updatesystem from mmc (ext4-fs) ...; " \ + "setenv simplefb 1; " \ "ext4load mmc 0:1 ${loadaddr} /${kernel}; " \ "ext4load mmc 0:1 ${ramaddr} /${ramdisk}; " \ "run mmcroot0; bootz ${loadaddr} ${ramaddr} ${dtbaddr};\0" \ "mmcboot1=echo booting PPT-OS from mmc (ext4-fs) ...; " \ + "setenv simplefb 0; " \ "ext4load mmc 0:2 ${loadaddr} /boot/${kernel}; " \ "run mmcroot1; bootz ${loadaddr} - ${dtbaddr};\0" \ "defboot=run logo0 || run logo1; " \