If the pixel format is not known to the core helpers, it fills in the
fb->bits_per_pixel field as 0. This causes a fatal divide-by-zero OOPS
when we then try to calculate the tiled offset. This would not be a
problem, but that the core helpers do not know about the YUV planar
formats we use for sprites.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_display.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 8986172..de09f47 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2019,6 +2019,9 @@ unsigned long intel_gen4_compute_offset_xtiled(int *x,
int *y,
{
int tile_rows, tiles;
+ if (bpp == 0) /* XXX unknown pixel format! */
+ return 0;
+
tile_rows = *y / 8;
*y %= 8;
tiles = *x / (512/bpp);
--
1.7.10.4
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