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da8xx-fb: save and restore LCDC context across suspend/resume cycle

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

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 2012-09-25 19:41:41 +05:30 • committed by Florian Tobias Schandinat
commit 7a93cbbb51
1 changed files with 65 additions and 0 deletions
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65
drivers/video/da8xx-fb.c
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@ -1491,6 +1491,69 @@ err_request_mem:
}
#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();