[Intel-gfx] [PATCH 06/11] drm/i915: Check the framebuffer offset

[ville.syrjala at linux.intel.com]

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

The current code can't deal with framebuffers with an offset. Return an
error when trying to create such a framebuffer until the rest of the
code is fixed to handle them.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---

I had an earlier version that actually added the handling for the offsets,
but as I still haven't managed to write test cases for that, I decided
that just refusing any offset is a good enough solution for now.

 drivers/gpu/drm/i915/intel_display.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f431f2a..a3496f5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8276,6 +8276,10 @@ int intel_framebuffer_init(struct drm_device *dev,
 		return -EINVAL;
 	}
 
+	/* FIXME need to adjust LINOFF/TILEOFF accordingly. */
+	if (mode_cmd->offsets[0] != 0)
+		return -EINVAL;
+
 	ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
 	if (ret) {
 		DRM_ERROR("framebuffer init failed %d\n", ret);
-- 
1.7.8.6