On Wed, 2019-07-10 at 15:58 +0300, Ville Syrjala wrote: > From: Ville Syrjälä <[email protected]> > > With 4:2:0 output the LS clock can be half of what it is with 4:4:4. > Make that happen. > > Cc: Gwan-gyeong Mun <[email protected]> > Signed-off-by: Ville Syrjälä <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_dp.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c > b/drivers/gpu/drm/i915/display/intel_dp.c > index 0bdb7ecc5a81..1dfacf090fb8 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -1853,8 +1853,10 @@ intel_dp_compute_link_config_wide(struct > intel_dp *intel_dp, > int mode_rate, link_clock, link_avail; > > for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * > 3) { > + int output_bpp = intel_dp_output_bpp(pipe_config, bpp); > + > mode_rate = intel_dp_link_required(adjusted_mode- > >crtc_clock, > - bpp); > + output_bpp); > > for (clock = limits->min_clock; clock <= limits- > >max_clock; clock++) { > for (lane_count = limits->min_lane_count; According to DP 1.4 spec section 1.7.1 [Makeup of the Main-Link], previous implementation worked by below explaination. After the stream data is packed and mapped to the Main-Link, the packed stream data rate shall be less than or equal to the Main-Link’s link symbol rate. When the packed stream data rate is less than the Main- Link’s link symbol rate, stuffing symbols are inserted.
Reviewed-by: Gwan-gyeong Mun <[email protected]> Tested-by: Gwan-gyeong Mun <[email protected]> _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
