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authorManjunathappa, Prakash <prakash.pm@ti.com>2011-11-15 13:02:23 +0100
committerFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>2011-11-22 01:55:53 +0100
commit74a0efdef1df7f576116811234ebedd8a1255ebc (patch)
tree285ba0ac7d0c2489d5b82e3a5e9cd4bdac94c0bc /drivers/video
parentLinux 3.2-rc2 (diff)
downloadlinux-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 'drivers/video')
-rw-r--r--drivers/video/da8xx-fb.c15
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)