From bcf4cef94294992f7cd11d5a90fa58b0eae6c795 Mon Sep 17 00:00:00 2001 From: Inki Dae Date: Fri, 24 Aug 2012 10:54:12 -0700 Subject: [PATCH] drm/exynos: Disable plane when released this patch ensures that each plane connected to encoder is disabled when released, by adding disable callback function of encoder helper we had faced with one issue that invalid memory is accessed by dma once drm is released and then the dma is turned on again. actually, in our case, page fault was incurred with iommu. the reason is that a gem buffer accessed by the dma is also released once drm is released. so this patch would fix this issue ensuring the dma is disabled when released. Signed-off-by: Inki Dae Signed-off-by: Kyungmin Park --- drivers/gpu/drm/exynos/exynos_drm_encoder.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/exynos/exynos_drm_encoder.c b/drivers/gpu/drm/exynos/exynos_drm_encoder.c index 92f9acf..96a10c3 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_encoder.c +++ b/drivers/gpu/drm/exynos/exynos_drm_encoder.c @@ -214,12 +214,27 @@ static void exynos_drm_encoder_commit(struct drm_encoder *encoder) manager_ops->commit(manager->dev); } +static void exynos_drm_encoder_disable(struct drm_encoder *encoder) +{ + struct drm_plane *plane; + struct drm_device *dev = encoder->dev; + + exynos_drm_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); + + /* all planes connected to this encoder should be also disabled. */ + list_for_each_entry(plane, &dev->mode_config.plane_list, head) { + if (plane->crtc == encoder->crtc) + plane->funcs->disable_plane(plane); + } +} + static struct drm_encoder_helper_funcs exynos_encoder_helper_funcs = { .dpms = exynos_drm_encoder_dpms, .mode_fixup = exynos_drm_encoder_mode_fixup, .mode_set = exynos_drm_encoder_mode_set, .prepare = exynos_drm_encoder_prepare, .commit = exynos_drm_encoder_commit, + .disable = exynos_drm_encoder_disable, }; static void exynos_drm_encoder_destroy(struct drm_encoder *encoder) -- 2.7.4