[PATCH 07/11] drm/dp: Add drm_dp_uhbr_channel_coding_supported()

[Manasi Navare]

Reviewed-by: Manasi Navare <navaremanasi at chromium.org>

Manasi

On Tue, Mar 26, 2024 at 5:54 AM Nautiyal, Ankit K
<ankit.k.nautiyal at intel.com> wrote:
>
>
> On 3/21/2024 1:41 AM, Imre Deak wrote:
> > Factor out a function to check for UHBR channel coding support used by a
> > follow-up patch in the patchset.
> >
> > Cc: dri-devel at lists.freedesktop.org
> > Signed-off-by: Imre Deak <imre.deak at intel.com>
>
> LGTM.
>
> Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
>
> > ---
> >   drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
> >   include/drm/display/drm_dp_helper.h     | 6 ++++++
> >   2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index dbe65651bf277..1d13a1ba2b97d 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -217,7 +217,7 @@ static void intel_dp_set_dpcd_sink_rates(struct intel_dp *intel_dp)
> >        * Sink rates for 128b/132b. If set, sink should support all 8b/10b
> >        * rates and 10 Gbps.
> >        */
> > -     if (intel_dp->dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B) {
> > +     if (drm_dp_uhbr_channel_coding_supported(intel_dp->dpcd)) {
> >               u8 uhbr_rates = 0;
> >
> >               BUILD_BUG_ON(ARRAY_SIZE(intel_dp->sink_rates) < ARRAY_SIZE(dp_rates) + 3);
> > diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
> > index a62fcd051d4d4..150c37a99a16f 100644
> > --- a/include/drm/display/drm_dp_helper.h
> > +++ b/include/drm/display/drm_dp_helper.h
> > @@ -221,6 +221,12 @@ drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> >       return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B;
> >   }
> >
> > +static inline bool
> > +drm_dp_uhbr_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> > +{
> > +     return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B;
> > +}
> > +
> >   static inline bool
> >   drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> >   {