Merge tag 'imx-fixes-3.8-3' of git://git.linaro.org/people/shawnguo/linux-2.6 into...

From Shawn Guo:

This is yet another critical imxfb fixes held off by absence of FB
maintainer for some time.

* tag 'imx-fixes-3.8-3' of git://git.linaro.org/people/shawnguo/linux-2.6:
  video: imxfb: Do not crash on reboot

diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c
index 600f6f9987cc678fc46849fefbc700acef1ea18c..0abf2bf2083604c48006a63682c410c7125109fb 100644 (file)
--- a/drivers/video/imxfb.c
+++ b/drivers/video/imxfb.c
@@ -139,6 +139,7 @@ struct imxfb_info {
        struct clk              *clk_ahb;
        struct clk              *clk_per;
        enum imxfb_type         devtype;
+       bool                    enabled;
 
        /*
         * These are the addresses we mapped
@@ -536,6 +537,10 @@ static void imxfb_exit_backlight(struct imxfb_info *fbi)
 
 static void imxfb_enable_controller(struct imxfb_info *fbi)
 {
+
+       if (fbi->enabled)
+               return;
+
        pr_debug("Enabling LCD controller\n");
 
        writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
@@ -556,6 +561,7 @@ static void imxfb_enable_controller(struct imxfb_info *fbi)
        clk_prepare_enable(fbi->clk_ipg);
        clk_prepare_enable(fbi->clk_ahb);
        clk_prepare_enable(fbi->clk_per);
+       fbi->enabled = true;
 
        if (fbi->backlight_power)
                fbi->backlight_power(1);
@@ -565,6 +571,9 @@ static void imxfb_enable_controller(struct imxfb_info *fbi)
 
 static void imxfb_disable_controller(struct imxfb_info *fbi)
 {
+       if (!fbi->enabled)
+               return;
+
        pr_debug("Disabling LCD controller\n");
 
        if (fbi->backlight_power)
@@ -575,6 +584,7 @@ static void imxfb_disable_controller(struct imxfb_info *fbi)
        clk_disable_unprepare(fbi->clk_per);
        clk_disable_unprepare(fbi->clk_ipg);
        clk_disable_unprepare(fbi->clk_ahb);
+       fbi->enabled = false;
 
        writel(0, fbi->regs + LCDC_RMCR);
 }