[PATCH] drm/i915/display: Workaround for odd panning for planar yuv

[Nemesa Garg]

Disable the support for odd x pan for even xsize for NV12
format as underrun issue is seen.

WA: 16024459452

v2: Replace HSD with WA in commit message [Suraj]
    Modified the condition for handling odd panning

v3: Simplified the condition for checking hsub
    Using older framework for wa as rev1[Jani]

v4: Modify the condition for hsub [Sai Teja]
    Initialize hsub in else path [Dan]

v5: Replace IS_LUNARLAKE with display version.
    Resolve nitpicks[Jani]

v6: Replace -EINVAL with hsub [Suraj]
    Remove src_w check as not required

Signed-off-by: Nemesa Garg <nemesa.garg at intel.com>
---
 drivers/gpu/drm/i915/display/intel_atomic_plane.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index e979786aa5cf..2d7ca6e62926 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -1031,6 +1031,11 @@ int intel_plane_check_src_coordinates(struct intel_plane_state *plane_state)
 		 */
 		hsub = 1;
 		vsub = 1;
+
+		/* Wa_16023981245 */
+		if (DISPLAY_VER(i915) == 20 && fb->format->format == DRM_FORMAT_NV12 &&
+		    src_x % 2 != 0)
+			hsub = 2;
 	} else {
 		hsub = fb->format->hsub;
 		vsub = fb->format->vsub;
-- 
2.25.1