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| author | Gregory CLEMENT <gregory.clement@free-electrons.com> | 2011-01-21 12:37:51 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-01-21 15:22:45 +0100 |
| commit | 286117d9379acc694367e9ca37c759ee06997237 (patch) | |
| tree | dd1a8a261932b983bfaac556c4ac7e46a7f69de3 | |
| parent | bd56e41d1912dcedd36549ee032b2dd7631fa6af (diff) | |
| download | barebox-286117d9379acc694367e9ca37c759ee06997237.tar.gz barebox-286117d9379acc694367e9ca37c759ee06997237.tar.xz | |
fb i.MX23/28: Add the reset control of LCD
Video controller of STM allow to control the reset bit of an external
LCD controller. When reset_lcd is set, CTRL1_RESET bit is used to
enable and disable LCD.
Handle USE_LCD_RESET as a flag in imx_fb_platformdata.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | arch/arm/mach-mxs/include/mach/fb.h | 3 | ||||
| -rw-r--r-- | drivers/video/stm.c | 11 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/include/mach/fb.h b/arch/arm/mach-mxs/include/mach/fb.h index 2b61dee2c7..2b6825f7b5 100644 --- a/arch/arm/mach-mxs/include/mach/fb.h +++ b/arch/arm/mach-mxs/include/mach/fb.h @@ -31,6 +31,8 @@ /** swap RGB to BGR */ #define FB_SYNC_SWAP_RGB (1 << 31) +#define USE_LCD_RESET 1 + struct imx_fb_platformdata { struct fb_videomode *mode_list; unsigned mode_cnt; @@ -42,6 +44,7 @@ struct imx_fb_platformdata { void *fixed_screen; /**< if != NULL use this as framebuffer memory */ unsigned fixed_screen_size; /**< framebuffer memory size for fixed_screen */ + unsigned flags; void (*enable)(int enable); /**< hook to enable backlight */ }; diff --git a/drivers/video/stm.c b/drivers/video/stm.c index 205cad15bf..ee2f0268bd 100644 --- a/drivers/video/stm.c +++ b/drivers/video/stm.c @@ -48,6 +48,7 @@ # define CTRL1_FIFO_CLEAR (1 << 21) # define SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16) # define GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf) +# define CTRL1_RESET (1 << 0) #ifdef CONFIG_ARCH_IMX28 # define HW_LCDIF_CTRL2 0x20 @@ -253,6 +254,11 @@ static void stmfb_enable_controller(struct fb_info *fb_info) /* stop FIFO reset */ writel(CTRL1_FIFO_CLEAR, fbi->base + HW_LCDIF_CTRL1 + BIT_CLR); + + /* enable LCD using LCD_RESET signal*/ + if (fbi->pdata->flags & USE_LCD_RESET) + writel(CTRL1_RESET, fbi->base + HW_LCDIF_CTRL1 + BIT_SET); + /* start the engine right now */ writel(CTRL_RUN, fbi->base + HW_LCDIF_CTRL + BIT_SET); @@ -266,6 +272,11 @@ static void stmfb_disable_controller(struct fb_info *fb_info) unsigned loop; uint32_t reg; + + /* disable LCD using LCD_RESET signal*/ + if (fbi->pdata->flags & USE_LCD_RESET) + writel(CTRL1_RESET, fbi->base + HW_LCDIF_CTRL1 + BIT_CLR); + if (fbi->pdata->enable) fbi->pdata->enable(0); |