drm/exynos: fimd: disable windows before registering driver

Bootloader might enable some windows, so ensure that all windows are
disabled before registering to the system. This solves IOMMU fault during
registration if bootloader enabled some FIMD windows.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 8aec342..ec060cb 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -1021,8 +1021,11 @@ static int fimd_probe(struct platform_device *pdev)
        DRM_DEBUG_KMS("pixel clock = %d, clkdiv = %d\n",
                        panel->timing.pixclock, ctx->clkdiv);
 
-       for (win = 0; win < WINDOWS_NR; win++)
+       for (win = 0; win < WINDOWS_NR; win++) {
                fimd_clear_win(ctx, win);
+               fimd_win_disable(dev, win);
+       }
+       fimd_wait_for_vblank(dev);
 
        exynos_drm_subdrv_register(subdrv);