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drm/i915: Add WA for planes ending close to left screen edge

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While running the kms_plane clipping test I noticed a similar problem to
the one described in Display WA #1175. In this case, similarly for
planes other than the cursor, with 1 or 3 pixels visible from the left
edge of the screen to the end of the plane and an odd plane X offset
used for clipping causes the same kind of underflow and display
corruption as described for WA #1175. Fix this in a similar way as that
WA rejecting planes ending <4 pixels from the left screen edge.

v2:
- Rebase on v2 of patch 1/1.

Testcase: igt/kms_plane/plane-clipping-pipe-*-planes
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180116112415.22060-2-imre.deak@intel.com
This commit is contained in:
Imre Deak 2018-01-16 13:24:15 +02:00
parent c322c64952
commit 394676f05b
1 changed files with 8 additions and 4 deletions
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12
drivers/gpu/drm/i915/intel_display.c
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@ -2959,12 +2959,16 @@ static int skl_check_main_surface(const struct intel_crtc_state *crtc_state,
* Planes other than the cursor may cause FIFO underflow and display
* corruption if starting less than 4 pixels from the right edge of
* the screen.
* Besides the above WA fix the similar problem, where planes other
* than the cursor ending less than 4 pixels from the left edge of the
* screen may cause FIFO underflow and display corruption.
*/
if ((IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) &&
dst_x > pipe_src_w - 4) {
DRM_DEBUG_KMS("requested plane X start position %d invalid (valid range %d-%d)\n",
dst_x,
0, pipe_src_w - 4);
(dst_x + w < 4 || dst_x > pipe_src_w - 4)) {
DRM_DEBUG_KMS("requested plane X %s position %d invalid (valid range %d-%d)\n",
dst_x + w < 4 ? "end" : "start",
dst_x + w < 4 ? dst_x + w : dst_x,
4, pipe_src_w - 4);
return -ERANGE;
}