| Message ID | 20200826182456.322681-10-lyude@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/dp, i915, nouveau: Cleanup nouveau HPD and add DP features from i915 | expand |
On Wed, 26 Aug 2020, Lyude Paul <lyude@redhat.com> wrote: > Just a tiny drive-by cleanup, we can consolidate i915's code for > checking for MST support into a helper to be shared across drivers. > > v5: > * Drop !!() > * Move drm_dp_has_mst() out of header > * Change name from drm_dp_has_mst() to drm_dp_read_mst_cap() > > Signed-off-by: Lyude Paul <lyude@redhat.com> > Reviewed-by: Sean Paul <sean@poorly.run> Reviewed-by: Jani Nikula <jani.nikula@intel.com> > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 22 ++++++++++++++++++++++ > drivers/gpu/drm/i915/display/intel_dp.c | 18 ++---------------- > include/drm/drm_dp_mst_helper.h | 3 +-- > 3 files changed, 25 insertions(+), 18 deletions(-) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 67dd72ea200e0..17dbed0a9800d 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -3486,6 +3486,28 @@ static int drm_dp_get_vc_payload_bw(u8 dp_link_bw, u8 dp_link_count) > return dp_link_bw * dp_link_count / 2; > } > > +/** > + * drm_dp_read_mst_cap() - check whether or not a sink supports MST > + * @aux: The DP AUX channel to use > + * @dpcd: A cached copy of the DPCD capabilities for this sink > + * > + * Returns: %True if the sink supports MST, %false otherwise > + */ > +bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, > + const u8 dpcd[DP_RECEIVER_CAP_SIZE]) > +{ > + u8 mstm_cap; > + > + if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_12) > + return false; > + > + if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1) > + return false; > + > + return mstm_cap & DP_MST_CAP; > +} > +EXPORT_SYMBOL(drm_dp_read_mst_cap); > + > /** > * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager > * @mgr: manager to set state for > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > index 79c27f91f42c0..4c7314b7a84e4 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -4699,20 +4699,6 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) > return true; > } > > -static bool > -intel_dp_sink_can_mst(struct intel_dp *intel_dp) > -{ > - u8 mstm_cap; > - > - if (intel_dp->dpcd[DP_DPCD_REV] < 0x12) > - return false; > - > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_MSTM_CAP, &mstm_cap) != 1) > - return false; > - > - return mstm_cap & DP_MST_CAP; > -} > - > static bool > intel_dp_can_mst(struct intel_dp *intel_dp) > { > @@ -4720,7 +4706,7 @@ intel_dp_can_mst(struct intel_dp *intel_dp) > > return i915->params.enable_dp_mst && > intel_dp->can_mst && > - intel_dp_sink_can_mst(intel_dp); > + drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd); > } > > static void > @@ -4729,7 +4715,7 @@ intel_dp_configure_mst(struct intel_dp *intel_dp) > struct drm_i915_private *i915 = dp_to_i915(intel_dp); > struct intel_encoder *encoder = > &dp_to_dig_port(intel_dp)->base; > - bool sink_can_mst = intel_dp_sink_can_mst(intel_dp); > + bool sink_can_mst = drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd); > > drm_dbg_kms(&i915->drm, > "[ENCODER:%d:%s] MST support: port: %s, sink: %s, modparam: %s\n", > diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h > index 8b9eb4db3381c..6ae5860d8644e 100644 > --- a/include/drm/drm_dp_mst_helper.h > +++ b/include/drm/drm_dp_mst_helper.h > @@ -728,10 +728,9 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, > > void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); > > - > +bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); > int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); > > - > int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 67dd72ea200e0..17dbed0a9800d 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3486,6 +3486,28 @@ static int drm_dp_get_vc_payload_bw(u8 dp_link_bw, u8 dp_link_count) return dp_link_bw * dp_link_count / 2; } +/** + * drm_dp_read_mst_cap() - check whether or not a sink supports MST + * @aux: The DP AUX channel to use + * @dpcd: A cached copy of the DPCD capabilities for this sink + * + * Returns: %True if the sink supports MST, %false otherwise + */ +bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, + const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + u8 mstm_cap; + + if (dpcd[DP_DPCD_REV] < DP_DPCD_REV_12) + return false; + + if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1) + return false; + + return mstm_cap & DP_MST_CAP; +} +EXPORT_SYMBOL(drm_dp_read_mst_cap); + /** * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager * @mgr: manager to set state for diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 79c27f91f42c0..4c7314b7a84e4 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -4699,20 +4699,6 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) return true; } -static bool -intel_dp_sink_can_mst(struct intel_dp *intel_dp) -{ - u8 mstm_cap; - - if (intel_dp->dpcd[DP_DPCD_REV] < 0x12) - return false; - - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_MSTM_CAP, &mstm_cap) != 1) - return false; - - return mstm_cap & DP_MST_CAP; -} - static bool intel_dp_can_mst(struct intel_dp *intel_dp) { @@ -4720,7 +4706,7 @@ intel_dp_can_mst(struct intel_dp *intel_dp) return i915->params.enable_dp_mst && intel_dp->can_mst && - intel_dp_sink_can_mst(intel_dp); + drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd); } static void @@ -4729,7 +4715,7 @@ intel_dp_configure_mst(struct intel_dp *intel_dp) struct drm_i915_private *i915 = dp_to_i915(intel_dp); struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base; - bool sink_can_mst = intel_dp_sink_can_mst(intel_dp); + bool sink_can_mst = drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd); drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] MST support: port: %s, sink: %s, modparam: %s\n", diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index 8b9eb4db3381c..6ae5860d8644e 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -728,10 +728,9 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); - +bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); - int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);