From: Chandra Konduru <chandra.kond...@intel.com>

This patch adds NV12 as supported format
to intel_framebuffer_init and performs various checks.

v2:
-Fix an issue in checks added (Chandra Konduru)

v3: rebased (me)

Link: https://patchwork.kernel.org/patch/6426221/
Signed-off-by: Chandra Konduru <chandra.kond...@intel.com>
Signed-off-by: Nabendu Maiti <nabendu.bikash.ma...@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srini...@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c 
b/drivers/gpu/drm/i915/intel_display.c
index a5520a8..a21dd23 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14755,6 +14755,21 @@ static int intel_framebuffer_init(struct 
intel_framebuffer *intel_fb,
                        goto err;
                }
                break;
+       case DRM_FORMAT_NV12:
+               if (!mode_cmd->offsets[1])
+                       DRM_ERROR("uv start offset not set\n");
+               if (mode_cmd->pitches[0] != mode_cmd->pitches[1] ||
+                       mode_cmd->handles[0] != mode_cmd->handles[1])
+                       DRM_ERROR("y & uv subplanes have different params\n");
+               if (mode_cmd->modifier[1] == I915_FORMAT_MOD_Yf_TILED &&
+                       (mode_cmd->offsets[1] & 0xFFF))
+                       DRM_ERROR("tile-Yf uv offset 0x%x isn't starting on new 
tile-row\n",
+                               mode_cmd->offsets[1]);
+               if (mode_cmd->modifier[1] == I915_FORMAT_MOD_Y_TILED &&
+                       ((mode_cmd->offsets[1] / mode_cmd->pitches[1]) % 4))
+                       DRM_ERROR("tile-Y uv offset 0x%x isn't 4-line 
aligned\n",
+                               mode_cmd->offsets[1]);
+               break;
        default:
                DRM_DEBUG_KMS("unsupported pixel format: %s\n",
                              drm_get_format_name(mode_cmd->pixel_format, 
&format_name));
-- 
1.9.1

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