[Intel-gfx] [PATCH] drm/i915: Add PLANE_CUS_CTL restriction in max_width

[Vidya Srinivas]

PLANE_CUS_CTL has a restriction of 4096 width even though
PLANE_SIZE and scaler size registers supports max 5120.
Take care of this restriction in max_width.

Without this patch, when 5k content is sent on HDR plane
with NV12 content, FIFO underrun is seen and screen blanks
out.

v2: Addressed review comments from Ville. Added separate
functions for max_width - for HDR and SDR

Signed-off-by: Vidya Srinivas <vidya.srini...@intel.com>
Signed-off-by: Yashashvi Shantam <shantam.yashas...@intel.com>
---
 .../gpu/drm/i915/display/skl_universal_plane.c  | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c 
b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 28890876bdeb..d320a3ba1ade 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -420,7 +420,17 @@ static int icl_plane_min_width(const struct 
drm_framebuffer *fb,
        }
 }
 
-static int icl_plane_max_width(const struct drm_framebuffer *fb,
+static int icl_plane_max_width_hdr(const struct drm_framebuffer *fb,
+                              int color_plane,
+                              unsigned int rotation)
+{
+       if (intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
+               return 4096;
+       else
+               return 5120;
+}
+
+static int icl_plane_max_width_sdr(const struct drm_framebuffer *fb,
                               int color_plane,
                               unsigned int rotation)
 {
@@ -2108,7 +2118,10 @@ skl_universal_plane_create(struct drm_i915_private 
*dev_priv,
 
        if (DISPLAY_VER(dev_priv) >= 11) {
                plane->min_width = icl_plane_min_width;
-               plane->max_width = icl_plane_max_width;
+               if (icl_is_hdr_plane(dev_priv, plane_id))
+                       plane->max_width = icl_plane_max_width_hdr;
+               else
+                       plane->max_width = icl_plane_max_width_sdr;
                plane->max_height = icl_plane_max_height;
                plane->min_cdclk = icl_plane_min_cdclk;
        } else if (DISPLAY_VER(dev_priv) >= 10) {
-- 
2.33.0