From: Sonika Jindal <sonika.jindal@intel.com>
Date: Wed, 20 May 2015 08:10:48 +0000 (+0530)
Subject: drm/i915/skl: Swapping 90 and 270 to be compliant with Xrandr
X-Git-Tag: v4.2-rc1~33^2~61
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1e8df16778b0d8fd8102b3ee799b028f8f961089;p=platform%2Fkernel%2Flinux-exynos.git

drm/i915/skl: Swapping 90 and 270 to be compliant with Xrandr

Since DRM_ROTATE is counter clockwise (which is compliant with Xrandr),
and HW rotation is clockwise, swapping 90/270 to work as expected from
userspace.

v2: Rebased

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 4a34709..c97b496 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3010,12 +3010,16 @@ u32 skl_plane_ctl_rotation(unsigned int rotation)
 	switch (rotation) {
 	case BIT(DRM_ROTATE_0):
 		break;
+	/*
+	 * DRM_ROTATE_ is counter clockwise to stay compatible with Xrandr
+	 * while i915 HW rotation is clockwise, thats why this swapping.
+	 */
 	case BIT(DRM_ROTATE_90):
-		return PLANE_CTL_ROTATE_90;
+		return PLANE_CTL_ROTATE_270;
 	case BIT(DRM_ROTATE_180):
 		return PLANE_CTL_ROTATE_180;
 	case BIT(DRM_ROTATE_270):
-		return PLANE_CTL_ROTATE_270;
+		return PLANE_CTL_ROTATE_90;
 	default:
 		MISSING_CASE(rotation);
 	}