Re: [PATCH v6 5/6] drm/i915/dp: Change a link bandwidth computation for DP

2019-05-09 Thread Mun, Gwan-gyeong
On Wed, 2019-05-08 at 20:58 +0300, Ville Syrjälä wrote: > On Wed, May 08, 2019 at 11:17:56AM +0300, Gwan-gyeong Mun wrote: > > Data M/N calculations were assumed a bpp as RGB format. But when we > > are > > using YCbCr 4:2:0 output format on DP, we should change bpp > > calculations > > as YCbCr 4:

Re: [PATCH v6 5/6] drm/i915/dp: Change a link bandwidth computation for DP

2019-05-08 Thread Ville Syrjälä
On Wed, May 08, 2019 at 11:17:56AM +0300, Gwan-gyeong Mun wrote: > Data M/N calculations were assumed a bpp as RGB format. But when we are > using YCbCr 4:2:0 output format on DP, we should change bpp calculations > as YCbCr 4:2:0 format. The pipe_bpp value was assumed RGB format, > therefore, it w

[PATCH v6 5/6] drm/i915/dp: Change a link bandwidth computation for DP

2019-05-08 Thread Gwan-gyeong Mun
Data M/N calculations were assumed a bpp as RGB format. But when we are using YCbCr 4:2:0 output format on DP, we should change bpp calculations as YCbCr 4:2:0 format. The pipe_bpp value was assumed RGB format, therefore, it was multiplied with 3. But YCbCr 4:2:0 requires a multiplier value to 1.5.