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.
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-stm/include/mach/fb.h | 1 +
drivers/video/stm.c | 11 +++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-stm/include/mach/fb.h b/arch/arm/mach-stm/include/mach/fb.h
index f899433..3d40479 100644
--- a/arch/arm/mach-stm/include/mach/fb.h
+++ b/arch/arm/mach-stm/include/mach/fb.h
@@ -39,6 +39,7 @@ struct imx_fb_videomode {
unsigned ld_intf_width; /**< refer STMLCDIF_* macros */
unsigned data_mode;
u32 bits_per_pixel;
+ unsigned reset_lcd; /** use LCD_RESET signal*/
};
#endif /* __MACH_FB_H */
diff --git a/drivers/video/stm.c b/drivers/video/stm.c
index 3dc2abe..b1bb9b3 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
@@ -271,6 +272,11 @@ 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->reset_lcd)
+ 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);
}
@@ -281,6 +287,11 @@ static void stmfb_disable_controller(struct fb_info *fb_info)
unsigned loop;
uint32_t reg;
+
+ /* disable LCD using LCD_RESET signal*/
+ if (fbi->pdata->reset_lcd)
+ writel(CTRL1_RESET, fbi->base + HW_LCDIF_CTRL1 + BIT_CLR);
+
/*
* Even if we disable the controller here, it will still continue
* until its FIFOs are running out of data
--
1.7.0.4
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