Commit 74a0efde authored by Manjunathappa, Prakash's avatar Manjunathappa, Prakash Committed by Florian Tobias Schandinat
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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: default avatarManjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent cfcfc9ec

drivers/video/da8xx-fb.c

+14 −1
Original line number Diff line number Diff line
@@ -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)