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

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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
This commit is contained in:
Olof Johansson
2013-01-23 20:35:02 -08:00
parent f6be19c8bc e6b267ce14
commit 4ad3041d3b
1 changed files with 10 additions and 0 deletions
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10
drivers/video/imxfb.c
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@@ -139,6 +139,7 @@ struct imxfb_info {
struct clk *clk_ahb; struct clk *clk_ahb;
struct clk *clk_per; struct clk *clk_per;
enum imxfb_type devtype; enum imxfb_type devtype;
bool enabled;
/* /*
* These are the addresses we mapped * 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) static void imxfb_enable_controller(struct imxfb_info *fbi)
{ {
if (fbi->enabled)
return;
pr_debug("Enabling LCD controller\n"); pr_debug("Enabling LCD controller\n");
writel(fbi->screen_dma, fbi->regs + LCDC_SSA); 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_ipg);
clk_prepare_enable(fbi->clk_ahb); clk_prepare_enable(fbi->clk_ahb);
clk_prepare_enable(fbi->clk_per); clk_prepare_enable(fbi->clk_per);
fbi->enabled = true;
if (fbi->backlight_power) if (fbi->backlight_power)
fbi->backlight_power(1); 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) static void imxfb_disable_controller(struct imxfb_info *fbi)
{ {
if (!fbi->enabled)
return;
pr_debug("Disabling LCD controller\n"); pr_debug("Disabling LCD controller\n");
if (fbi->backlight_power) 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_per);
clk_disable_unprepare(fbi->clk_ipg); clk_disable_unprepare(fbi->clk_ipg);
clk_disable_unprepare(fbi->clk_ahb); clk_disable_unprepare(fbi->clk_ahb);
fbi->enabled = false;
writel(0, fbi->regs + LCDC_RMCR); writel(0, fbi->regs + LCDC_RMCR);
} }