[PATCH 4/6] drm/i915: Check the framebuffer offset

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The framebuffer offset must be aligned to (macro)pixel size.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8fea475..9df15ee 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6660,6 +6660,7 @@ int intel_framebuffer_init(struct drm_device *dev,
 			   struct drm_i915_gem_object *obj)
 {
 	int ret;
+	unsigned int align = drm_format_plane_cpp(mode_cmd->pixel_format, 0);
 
 	if (obj->tiling_mode == I915_TILING_Y)
 		return -EINVAL;
@@ -6699,6 +6700,7 @@ int intel_framebuffer_init(struct drm_device *dev,
 	case DRM_FORMAT_UYVY:
 	case DRM_FORMAT_YVYU:
 	case DRM_FORMAT_VYUY:
+		align <<= 1;
 		if (INTEL_INFO(dev)->gen < 6)
 			return -EINVAL;
 		break;
@@ -6707,6 +6709,9 @@ int intel_framebuffer_init(struct drm_device *dev,
 		return -EINVAL;
 	}
 
+	if (mode_cmd->offsets[0] % align)
+		return -EINVAL;
+
 	ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
 	if (ret) {
 		DRM_ERROR("framebuffer init failed %d\n", ret);
-- 
1.7.3.4