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| author | Manjunathappa, Prakash <prakash.pm@ti.com> | 2011-11-15 13:02:23 +0100 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2011-11-22 01:55:53 +0100 |
| commit | 74a0efdef1df7f576116811234ebedd8a1255ebc (patch) | |
| tree | 285ba0ac7d0c2489d5b82e3a5e9cd4bdac94c0bc /drivers/video/da8xx-fb.c | |
| parent | Linux 3.2-rc2 (diff) | |
| download | linux-74a0efdef1df7f576116811234ebedd8a1255ebc.tar.xz linux-74a0efdef1df7f576116811234ebedd8a1255ebc.zip | |
video:da8xx-fb: Disable and reset sequence on version2 of LCDC
Patch follows the disable and software reset sequence specified
in version2 to LCDC functional specification.
Without this flicker is observed on re-enabling the LCDC.
Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/da8xx-fb.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c index 55f91d9ab00b..29577bf1f559 100644 --- a/drivers/video/da8xx-fb.c +++ b/drivers/video/da8xx-fb.c @@ -116,6 +116,7 @@ /* Clock registers available only on Version 2 */ #define LCD_CLK_ENABLE_REG 0x6c #define LCD_CLK_RESET_REG 0x70 +#define LCD_CLK_MAIN_RESET BIT(3) #define LCD_NUM_BUFFERS 2 @@ -244,6 +245,10 @@ static inline void lcd_enable_raster(void) { u32 reg; + /* Bring LCDC out of reset */ + if (lcd_revision == LCD_VERSION_2) + lcdc_write(0, LCD_CLK_RESET_REG); + reg = lcdc_read(LCD_RASTER_CTRL_REG); if (!(reg & LCD_RASTER_ENABLE)) lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG); @@ -257,6 +262,10 @@ static inline void lcd_disable_raster(void) reg = lcdc_read(LCD_RASTER_CTRL_REG); if (reg & LCD_RASTER_ENABLE) lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG); + + if (lcd_revision == LCD_VERSION_2) + /* Write 1 to reset LCDC */ + lcdc_write(LCD_CLK_MAIN_RESET, LCD_CLK_RESET_REG); } static void lcd_blit(int load_mode, struct da8xx_fb_par *par) @@ -584,8 +593,12 @@ static void lcd_reset(struct da8xx_fb_par *par) lcdc_write(0, LCD_DMA_CTRL_REG); lcdc_write(0, LCD_RASTER_CTRL_REG); - if (lcd_revision == LCD_VERSION_2) + if (lcd_revision == LCD_VERSION_2) { lcdc_write(0, LCD_INT_ENABLE_SET_REG); + /* Write 1 to reset */ + lcdc_write(LCD_CLK_MAIN_RESET, LCD_CLK_RESET_REG); + lcdc_write(0, LCD_CLK_RESET_REG); + } } static void lcd_calc_clk_divider(struct da8xx_fb_par *par) |