da8xx-fb: add pm_runtime support

Add pm_runtime support to the da8xx-fb frame buffer driver.

Signed-off-by Manjunathappa, Prakash <[email protected]>

---
Applies on top of patch "da8xx-fb: enable LCDC if FB is unblanked" under review. Since v1:
Use pm_runtime_put_sync in PM suspend callback.

 drivers/video/da8xx-fb.c |   27 +++++++++++++--------------
 1 files changed, 13 insertions(+), 14 deletions(-)

drivers/video/da8xx-fb.c +13 -14

index af2aa38..4280d23 100644
@@ -26,6 +26,7 @@
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
 #include <linux/interrupt.h>
 #include <linux/wait.h>
 #include <linux/clk.h>

@@ -1037,8 +1038,8 @@ static int __devexit fb_remove(struct platform_device *dev)
 		dma_free_coherent(NULL, par->vram_size, par->vram_virt,
 				  par->vram_phys);
 		free_irq(par->irq, par);
-		clk_disable(par->lcdc_clk);
-		clk_put(par->lcdc_clk);
+		pm_runtime_put_sync(&dev->dev);
+		pm_runtime_disable(&dev->dev);
 		framebuffer_release(info);
 		iounmap((void __iomem *)da8xx_fb_reg_base);
 		release_mem_region(lcdc_regs->start, resource_size(lcdc_regs));

@@ -1272,9 +1273,9 @@ static int __devinit fb_probe(struct platform_device *device)
 		ret = -ENODEV;
 		goto err_ioremap;
 	}
-	ret = clk_enable(fb_clk);
-	if (ret)
-		goto err_clk_put;
+
+	pm_runtime_enable(&device->dev);
+	pm_runtime_get_sync(&device->dev);
 
 	/* Determine LCD IP Version */
 	switch (lcdc_read(LCD_PID_REG)) {

@@ -1302,7 +1303,7 @@ static int __devinit fb_probe(struct platform_device *device)
 	if (i = ARRAY_SIZE(known_lcd_panels)) {
 		dev_err(&device->dev, "GLCD: No valid panel found\n");
 		ret = -ENODEV;
-		goto err_clk_disable;
+		goto err_pm_runtime_disable;
 	} else
 		dev_info(&device->dev, "GLCD: Found %s panel\n",
 					fb_pdata->type);

@@ -1314,7 +1315,7 @@ static int __devinit fb_probe(struct platform_device *device)
 	if (!da8xx_fb_info) {
 		dev_dbg(&device->dev, "Memory allocation failed for fb_info\n");
 		ret = -ENOMEM;
-		goto err_clk_disable;
+		goto err_pm_runtime_disable;
 	}
 
 	par = da8xx_fb_info->par;

@@ -1476,11 +1477,9 @@ err_release_fb_mem:
 err_release_fb:
 	framebuffer_release(da8xx_fb_info);
 
-err_clk_disable:
-	clk_disable(fb_clk);
-
-err_clk_put:
-	clk_put(fb_clk);
+err_pm_runtime_disable:
+	pm_runtime_put_sync(&device->dev);
+	pm_runtime_disable(&device->dev);
 
 err_ioremap:
 	iounmap((void __iomem *)da8xx_fb_reg_base);

@@ -1503,7 +1502,7 @@ static int fb_suspend(struct platform_device *dev, pm_message_t state)
 
 	fb_set_suspend(info, 1);
 	lcd_disable_raster(true);
-	clk_disable(par->lcdc_clk);
+	pm_runtime_put_sync(&dev->dev);
 	console_unlock();
 
 	return 0;

@@ -1514,7 +1513,7 @@ static int fb_resume(struct platform_device *dev)
 	struct da8xx_fb_par *par = info->par;
 
 	console_lock();
-	clk_enable(par->lcdc_clk);
+	pm_runtime_get_sync(&dev->dev);
 	if (par->blank = FB_BLANK_UNBLANK) {
 		lcd_enable_raster();