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@xxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-mxs/include/mach/fb.h | 3 +++
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 2b61dee..2b6825f 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 205cad1..ee2f026 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);
--
1.7.0.4
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