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drm/exynos: check crtc's dpms mode at SetCrtc

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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>
This commit is contained in:
Inki Dae 2012-09-14 13:29:47 +09:00
parent ef6223dc6b
commit 32aeab1745
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/exynos/exynos_drm_crtc.c
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@ -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;