From: Chandra Konduru <>

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

-Fix an issue in checks added (Chandra Konduru)

v3: rebased (me)

v4: Review comments by Ville addressed
Added platform check for NV12 in intel_framebuffer_init
Removed offset checks for NV12 case

v5: Addressed review comments by Clinton A Taylor
This NV12 support only correctly works on SKL.
Plane color space conversion is different on GLK and later platforms
causing the colors to display incorrectly.
Ville's plane color space property patch series
in review will fix this issue.
- Restricted the NV12 case in intel_framebuffer_init to
SKL and BXT only.

v6: Rebased (me)

v7: Addressed review comments by Ville
Restricting the NV12 to BXT for now.

v8: Rebased (me)
Restricting the NV12 changes to BXT and KBL for now.

v9: Rebased (me)

v10: NV12 supported by all GEN >= 9.
Making this change in intel_framebuffer_init. This is
part of addressing Maarten's review comments.
Comment under v8 no longer applicable

v11: Addressed review comments from Shashank Sharma

v12: Adding Reviewed By from Shashank Sharma

v13: Addressed review comments from Juha-Pekka Heikkila
"NV12 not to be supported by SKL"

v14: Addressed review comments from Maarten.
Add checks for fb width height for NV12 and fail the fb
creation if check fails. Added reviewed by from
Juha-Pekka Heikkila

v15: Rebased the series

v16: Setting the minimum value during fb creating to 16
as per Bspec for NV12. Earlier minimum was expected
to be > 16. Now changed it to >=16.

Credits-to: Maarten Lankhorst <>
Tested-by: Clinton Taylor <>
Reviewed-by: Shashank Sharma <>
Reviewed-by: Clinton Taylor <>
Reviewed-by: Juha-Pekka Heikkila <>
Signed-off-by: Chandra Konduru <>
Signed-off-by: Nabendu Maiti <>
Signed-off-by: Vidya Srinivas <>
 drivers/gpu/drm/i915/intel_display.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c 
index d591f51..45d59fd 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14251,6 +14251,14 @@ static int intel_framebuffer_init(struct 
intel_framebuffer *intel_fb,
                        goto err;
+       case DRM_FORMAT_NV12:
+               if (INTEL_GEN(dev_priv) < 9 || IS_SKYLAKE(dev_priv)) {
+                       DRM_DEBUG_KMS("unsupported pixel format: %s\n",
+                                                         &format_name));
+                       goto err;
+               }
+               break;
                DRM_DEBUG_KMS("unsupported pixel format: %s\n",
@@ -14263,6 +14271,12 @@ static int intel_framebuffer_init(struct 
intel_framebuffer *intel_fb,
        drm_helper_mode_fill_fb_struct(&dev_priv->drm, fb, mode_cmd);
+       if (fb->format->format == DRM_FORMAT_NV12 &&
+           fb->height < SKL_MIN_YUV_420_SRC_H) {
+               DRM_DEBUG_KMS("src fb h should be min 16\n");
+               return -EINVAL;
+       }
        for (i = 0; i < fb->format->num_planes; i++) {
                u32 stride_alignment;

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