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Commit 7a93cbbb authored by Manjunathappa, Prakash's avatar Manjunathappa, Prakash Committed by Florian Tobias Schandinat
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da8xx-fb: save and restore LCDC context across suspend/resume cycle 



Save and restore register context of LCDC respectively
before suspend and after resume.

Signed-off-by: default avatarManjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent 9dd44d5d

drivers/video/da8xx-fb.c

+65 −0
Original line number Diff line number Diff line
@@ -1491,6 +1491,69 @@ static int __devinit fb_probe(struct platform_device *device) 
}



#ifdef CONFIG_PM

struct lcdc_context {

	u32 clk_enable;

	u32 ctrl;

	u32 dma_ctrl;

	u32 raster_timing_0;

	u32 raster_timing_1;

	u32 raster_timing_2;

	u32 int_enable_set;

	u32 dma_frm_buf_base_addr_0;

	u32 dma_frm_buf_ceiling_addr_0;

	u32 dma_frm_buf_base_addr_1;

	u32 dma_frm_buf_ceiling_addr_1;

	u32 raster_ctrl;

} reg_context;



static void lcd_context_save(void)

{

	if (lcd_revision == LCD_VERSION_2) {

		reg_context.clk_enable = lcdc_read(LCD_CLK_ENABLE_REG);

		reg_context.int_enable_set = lcdc_read(LCD_INT_ENABLE_SET_REG);

	}



	reg_context.ctrl = lcdc_read(LCD_CTRL_REG);

	reg_context.dma_ctrl = lcdc_read(LCD_DMA_CTRL_REG);

	reg_context.raster_timing_0 = lcdc_read(LCD_RASTER_TIMING_0_REG);

	reg_context.raster_timing_1 = lcdc_read(LCD_RASTER_TIMING_1_REG);

	reg_context.raster_timing_2 = lcdc_read(LCD_RASTER_TIMING_2_REG);

	reg_context.dma_frm_buf_base_addr_0 =

		lcdc_read(LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);

	reg_context.dma_frm_buf_ceiling_addr_0 =

		lcdc_read(LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);

	reg_context.dma_frm_buf_base_addr_1 =

		lcdc_read(LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);

	reg_context.dma_frm_buf_ceiling_addr_1 =

		lcdc_read(LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);

	reg_context.raster_ctrl = lcdc_read(LCD_RASTER_CTRL_REG);

	return;

}



static void lcd_context_restore(void)

{

	if (lcd_revision == LCD_VERSION_2) {

		lcdc_write(reg_context.clk_enable, LCD_CLK_ENABLE_REG);

		lcdc_write(reg_context.int_enable_set, LCD_INT_ENABLE_SET_REG);

	}



	lcdc_write(reg_context.ctrl, LCD_CTRL_REG);

	lcdc_write(reg_context.dma_ctrl, LCD_DMA_CTRL_REG);

	lcdc_write(reg_context.raster_timing_0, LCD_RASTER_TIMING_0_REG);

	lcdc_write(reg_context.raster_timing_1, LCD_RASTER_TIMING_1_REG);

	lcdc_write(reg_context.raster_timing_2, LCD_RASTER_TIMING_2_REG);

	lcdc_write(reg_context.dma_frm_buf_base_addr_0,

			LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);

	lcdc_write(reg_context.dma_frm_buf_ceiling_addr_0,

			LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);

	lcdc_write(reg_context.dma_frm_buf_base_addr_1,

			LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);

	lcdc_write(reg_context.dma_frm_buf_ceiling_addr_1,

			LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);

	lcdc_write(reg_context.raster_ctrl, LCD_RASTER_CTRL_REG);

	return;

}



static int fb_suspend(struct platform_device *dev, pm_message_t state)

{

	struct fb_info *info = platform_get_drvdata(dev);
@@ -1502,6 +1565,7 @@ static int fb_suspend(struct platform_device *dev, pm_message_t state) 


	fb_set_suspend(info, 1);

	lcd_disable_raster(true);

	lcd_context_save();

	pm_runtime_put_sync(&dev->dev);

	console_unlock();
@@ -1514,6 +1578,7 @@ static int fb_resume(struct platform_device *dev) 


	console_lock();

	pm_runtime_get_sync(&dev->dev);

	lcd_context_restore();

	if (par->blank == FB_BLANK_UNBLANK) {

		lcd_enable_raster();