davinci: fb : add suspend/resume suuport for DA8xx/OMAP-L1xx fb driver

Suspend/resume support DA8xx/OMAP-L1xx frame buffer driver.  This feature
has been tested on DA850/OMAP-L138 EVM.  For the purpose of testing, the
patch series[1] which adds suspend support for DA850/OMAP-L138 SoC was
applied.

[1] http://patchwork.kernel.org/patch/60260/

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 27 insertions, 2 deletions

diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index eb95b893e8b2..36574bf61d06 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -29,6 +29,7 @@
 #include <linux/interrupt.h>
 #include <linux/clk.h>
 #include <linux/cpufreq.h>
+#include <linux/console.h>
 #include <video/da8xx-fb.h>
 
 #define DRIVER_NAME "da8xx_lcdc"
@@ -930,11 +931,35 @@ err_request_mem:
 #ifdef CONFIG_PM
 static int fb_suspend(struct platform_device *dev, pm_message_t state)
 {
-         return -EBUSY;
+        struct fb_info *info = platform_get_drvdata(dev);
+        struct da8xx_fb_par *par = info->par;
+
+        acquire_console_sem();
+        if (par->panel_power_ctrl)
+                par->panel_power_ctrl(0);
+
+        fb_set_suspend(info, 1);
+        lcd_disable_raster();
+        clk_disable(par->lcdc_clk);
+        release_console_sem();
+
+        return 0;
 }
 static int fb_resume(struct platform_device *dev)
 {
-         return -EBUSY;
+        struct fb_info *info = platform_get_drvdata(dev);
+        struct da8xx_fb_par *par = info->par;
+
+        acquire_console_sem();
+        if (par->panel_power_ctrl)
+                par->panel_power_ctrl(1);
+
+        clk_enable(par->lcdc_clk);
+        lcd_enable_raster();
+        fb_set_suspend(info, 0);
+        release_console_sem();
+
+        return 0;
 }
 #else
 #define fb_suspend NULL