diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2021-02-11 16:52:14 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2021-02-22 18:06:05 +0200 |
| commit | de46dbe4b755c24e11655f69abb008a9573c9cba (patch) | |
| tree | ec081070313c68398151a854435538175eaa6904 | |
| parent | f886261735fca91e3bdec0e56c86a5e71e4eea67 (diff) | |
drm/i915/edp: read sink MSO configuration for eDP 1.4+
Read and debug log the eDP sink MSO configuration. Do not actually do
anything with the information yet besides logging.
FIXME: The pixel overlap is present in DisplayID 2.0, but we don't have
parsing for that. Assume zero for now. We could also add quirks for
non-zero pixel overlap before DisplayID 2.0 parsing.
v3: Add placeholder for pixel overlap.
v2: Rename intel_dp_mso_init -> intel_edp_mso_init
Cc: Nischal Varide <nischal.varide@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/24ef61574e5af12cd86d5b85afbfbd4ac2f9de25.1613054234.git.jani.nikula@intel.com
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display_types.h | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 33 |
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h index 900e07bb54ca..1a76e1d9de7a 100644 --- a/drivers/gpu/drm/i915/display/intel_display_types.h +++ b/drivers/gpu/drm/i915/display/intel_display_types.h @@ -1493,6 +1493,8 @@ struct intel_dp { int max_link_lane_count; /* Max rate for the current link */ int max_link_rate; + int mso_link_count; + int mso_pixel_overlap; /* sink or branch descriptor */ struct drm_dp_desc desc; struct drm_dp_aux aux; diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index b08098237427..2ec82a5c9f24 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -3516,6 +3516,37 @@ static void intel_dp_get_dsc_sink_cap(struct intel_dp *intel_dp) } } +static void intel_edp_mso_init(struct intel_dp *intel_dp) +{ + struct drm_i915_private *i915 = dp_to_i915(intel_dp); + u8 mso; + + if (intel_dp->edp_dpcd[0] < DP_EDP_14) + return; + + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP_MSO_LINK_CAPABILITIES, &mso) != 1) { + drm_err(&i915->drm, "Failed to read MSO cap\n"); + return; + } + + /* Valid configurations are SST or MSO 2x1, 2x2, 4x1 */ + mso &= DP_EDP_MSO_NUMBER_OF_LINKS_MASK; + if (mso % 2 || mso > drm_dp_max_lane_count(intel_dp->dpcd)) { + drm_err(&i915->drm, "Invalid MSO link count cap %u\n", mso); + mso = 0; + } + + if (mso) { + drm_dbg_kms(&i915->drm, "Sink MSO %ux%u configuration\n", + mso, drm_dp_max_lane_count(intel_dp->dpcd) / mso); + drm_err(&i915->drm, "No source MSO support, disabling\n"); + mso = 0; + } + + intel_dp->mso_link_count = mso; + intel_dp->mso_pixel_overlap = 0; /* FIXME: read from DisplayID v2.0 */ +} + static bool intel_edp_init_dpcd(struct intel_dp *intel_dp) { @@ -3599,6 +3630,8 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) */ intel_edp_init_source_oui(intel_dp, true); + intel_edp_mso_init(intel_dp); + return true; } |