[PATCH 4/4] drm/exynos: check crtc's dpms mode at SetCrtc

[Inki Dae <inki.dae@samsung.com>]

when fb changing is requested, crtc's dpms mode should be on.
if not on, return -EPERM so that the hardware can't be accessed.
if user requesed dpms off and next SetCrtc with an another fb
then the hardware can be accessed with dpms off to write overlay
data onto some registers so this patch will prevent from accessing
the hardware with dpms off.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_crtc.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 5eda559..2810900 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -155,6 +155,12 @@ static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 
 	DRM_DEBUG_KMS("%s\n", __FILE__);
 
+	/* when framebuffer changing is requested, crtc's dpms should be on */
+	if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
+		DRM_ERROR("failed framebuffer changing request.\n");
+		return -EPERM;
+	}
+
 	crtc_w = crtc->fb->width - x;
 	crtc_h = crtc->fb->height - y;
 
-- 
1.7.4.1