Save and restore register context of LCDC respectively
before suspend and after resume.
Signed-off-by: Manjunathappa, Prakash <redacted>
---
Applies on top of below patch under review:
"da8xx-fb: add pm_runtime support"
drivers/video/da8xx-fb.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 4280d23..65a11ef 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -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();
--
1.7.0.4