diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2021-08-23 19:18:07 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2021-08-24 11:00:44 +0300 |
| commit | 9ab29e1501595975b89692207b22b59b9308e9eb (patch) | |
| tree | 7cb821ea35df0de63afc533c4b2cd561847d8a77 /drivers/gpu/drm | |
| parent | f5b21c2e3da4594140b916dfed0e007d3fe8267c (diff) | |
| download | linux-9ab29e1501595975b89692207b22b59b9308e9eb.tar.xz | |
drm/i915/dp: read sink UHBR rates
See if sink supports DP 2.0 128b/132b channel encoding, and update sink
rates accordingly.
FIXME: Also take LTTPR 128b/132b into account.
v2: Add build-time check for ->sink_rates size (Ville)
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/089d807e887d308c52c84cf58dfb6777de18872d.1629735412.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index b21dac19ae76..3a701728e47e 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -141,6 +141,26 @@ static void intel_dp_set_sink_rates(struct intel_dp *intel_dp) intel_dp->sink_rates[i] = dp_rates[i]; } + /* + * 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) { + u8 uhbr_rates = 0; + + BUILD_BUG_ON(ARRAY_SIZE(intel_dp->sink_rates) < ARRAY_SIZE(dp_rates) + 3); + + drm_dp_dpcd_readb(&intel_dp->aux, + DP_128B132B_SUPPORTED_LINK_RATES, &uhbr_rates); + + if (uhbr_rates & DP_UHBR10) + intel_dp->sink_rates[i++] = 1000000; + if (uhbr_rates & DP_UHBR13_5) + intel_dp->sink_rates[i++] = 1350000; + if (uhbr_rates & DP_UHBR20) + intel_dp->sink_rates[i++] = 2000000; + } + intel_dp->num_sink_rates = i; } |