iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

video:da8xx-fb: Disable and reset sequence on version2 of LCDC

Browse Source 
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>
This commit is contained in:
Manjunathappa, Prakash 2011-11-15 17:32:23 +05:30 committed by Florian Tobias Schandinat
parent cfcfc9eca2
commit 74a0efdef1
1 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/video/da8xx-fb.c
View File

@ -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)