[Intel-gfx] [PATCH 10/15] drm/i915: Add NV12 support to intel_framebuffer_init

[Chandra Konduru]

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

v2:
-Fix an issue in checks added (me)

Signed-off-by: Chandra Konduru <chandra.konduru at intel.com>
Testcase: igt/kms_nv12
---
 drivers/gpu/drm/i915/intel_display.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e4a6a91..4df4d77 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14343,6 +14343,34 @@ static int intel_framebuffer_init(struct drm_device *dev,
 			return -EINVAL;
 		}
 		break;
+	case DRM_FORMAT_NV12:
+		if (INTEL_INFO(dev)->gen < 9) {
+			DRM_DEBUG("unsupported pixel format: %s\n",
+				  drm_get_format_name(mode_cmd->pixel_format));
+			return -EINVAL;
+		}
+		if (!mode_cmd->offsets[1]) {
+			DRM_DEBUG("uv start offset not set\n");
+			return -EINVAL;
+		}
+		if (mode_cmd->pitches[0] != mode_cmd->pitches[1] ||
+			mode_cmd->handles[0] != mode_cmd->handles[1]) {
+			DRM_DEBUG("y and uv subplanes have different parameters\n");
+			return -EINVAL;
+		}
+		if (mode_cmd->modifier[1] == I915_FORMAT_MOD_Yf_TILED &&
+			(mode_cmd->offsets[1] & 0xFFF)) {
+			DRM_DEBUG("tile-Yf uv offset 0x%x isn't starting on new tile-row\n",
+				mode_cmd->offsets[1]);
+			return -EINVAL;
+		}
+		if (mode_cmd->modifier[1] == I915_FORMAT_MOD_Y_TILED &&
+			((mode_cmd->offsets[1] / mode_cmd->pitches[1]) % 4)) {
+			DRM_DEBUG("tile-Y uv offset 0x%x isn't 4-line aligned\n",
+				mode_cmd->offsets[1]);
+			return -EINVAL;
+		}
+		break;
 	default:
 		DRM_DEBUG("unsupported pixel format: %s\n",
 			  drm_get_format_name(mode_cmd->pixel_format));
-- 
1.7.9.5