Re: [PATCH 1/7] drm/i915/skl+: Use proper bytes_per_pixel during WM calculation

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On 01/15/2016 12:37 AM, Matt Roper wrote:
On Thu, Jan 14, 2016 at 05:32:42PM +0530, Shobhit Kumar wrote:
From: "Kumar, Mahesh" <mahesh1.kumar@xxxxxxxxx>

Don't always use bytes_per_pixel using y_plane=0, instead use it
according to pixel format. If NV12 use y_plane eqal to 1

Signed-off-by: Kumar, Mahesh <mahesh1.kumar@xxxxxxxxx>

The second parameter to drm_format_plane_cpp() is the plane index
(0 => Y = 1bpp, 1 => UV = 2bpp), so I think passing 0 actually was what
we wanted, right?


Yes, I guess it was an oversight. Might have to test again for NV12 but for now we can drop this patch.

Regards
Shobhit


Matt

---
  drivers/gpu/drm/i915/intel_pm.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9df9e9a..68f21b9 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3185,7 +3185,9 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
  	if (latency == 0 || !cstate->base.active || !fb)
  		return false;

-	bytes_per_pixel = drm_format_plane_cpp(fb->pixel_format, 0);
+	bytes_per_pixel = (fb->pixel_format == DRM_FORMAT_NV12) ?
+				drm_format_plane_cpp(fb->pixel_format, 1) :
+				drm_format_plane_cpp(fb->pixel_format, 0);
  	method1 = skl_wm_method1(skl_pipe_pixel_rate(cstate),
  				 bytes_per_pixel,
  				 latency);
--
2.4.3


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