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drm/exynos: initialize VIDCON0 when fimd is disabled 

When the fimd is disabled by fimd_disable(), enabled overlay layers also
are disabled. If clocks for fimd are enabled by fimd_enable() on this
case, it can lead IOMMU page fault. The reason is that VIDCON0_ENVID and
VIDCON0_ENVID_F bits of VIDCON0 register are set still even though fimd
is disabled, so it may continue display output of prior when clocks for
fimd are enabled again.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Joonyoung Shim 2015-06-12 17:27:16 +09:00 committed by Inki Dae
parent c329f667ba
commit b74f14fd5c
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/exynos/exynos_drm_fimd.c
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@ -801,6 +801,8 @@ static void fimd_disable(struct exynos_drm_crtc *crtc)
for (i = 0; i < WINDOWS_NR; i++)
fimd_win_disable(crtc, i);
writel(0, ctx->regs + VIDCON0);
clk_disable_unprepare(ctx->lcd_clk);
clk_disable_unprepare(ctx->bus_clk);