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authorJani Nikula <jani.nikula@intel.com>2024-03-19 10:12:48 +0100
committerJani Nikula <jani.nikula@intel.com>2024-03-21 07:44:25 +0100
commit281a2cc71a1b9fce8fde59b39671ca55c2bf6307 (patch)
tree2ef7bf3a149f648009d71a6af52a99cbdf7b4b2b
parentdrm/i915: Rename ICL_PORT_TX_DW6 bits (diff)
downloadlinux-281a2cc71a1b9fce8fde59b39671ca55c2bf6307.tar.xz
linux-281a2cc71a1b9fce8fde59b39671ca55c2bf6307.zip
drm/mst: read sideband messaging cap
Amend drm_dp_read_mst_cap() to return an enum, indicating "SST", "SST with sideband messaging", or "MST". Modify all call sites to take the new return value into account. v2: - Rename enumerators (Ville) Cc: Arun R Murthy <arun.r.murthy@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Karol Herbst <kherbst@redhat.com> Cc: Lyude Paul <lyude@redhat.com> Cc: Danilo Krummrich <dakr@redhat.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Acked-by: Maxime Ripard <mripard@kernel.org> Acked-by: Danilo Krummrich <dakr@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/b32a3704934871a67d06420b760e148b76c5ced8.1710839496.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com>
-rw-r--r--drivers/gpu/drm/display/drm_dp_mst_topology.c20
-rw-r--r--drivers/gpu/drm/i915/display/intel_dp.c4
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_dp.c2
-rw-r--r--include/drm/display/drm_dp_mst_helper.h23
4 files changed, 38 insertions, 11 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 03d528209426..c193be3577f7 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -3608,24 +3608,30 @@ fixed20_12 drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr,
EXPORT_SYMBOL(drm_dp_get_vc_payload_bw);
/**
- * drm_dp_read_mst_cap() - check whether or not a sink supports MST
+ * drm_dp_read_mst_cap() - Read the sink's MST mode capability
* @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
+ * Returns: enum drm_dp_mst_mode to indicate MST mode capability
*/
-bool drm_dp_read_mst_cap(struct drm_dp_aux *aux,
- const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+enum drm_dp_mst_mode 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;
+ return DRM_DP_SST;
if (drm_dp_dpcd_readb(aux, DP_MSTM_CAP, &mstm_cap) != 1)
- return false;
+ return DRM_DP_SST;
+
+ if (mstm_cap & DP_MST_CAP)
+ return DRM_DP_MST;
+
+ if (mstm_cap & DP_SINGLE_STREAM_SIDEBAND_MSG)
+ return DRM_DP_SST_SIDEBAND_MSG;
- return mstm_cap & DP_MST_CAP;
+ return DRM_DP_SST;
}
EXPORT_SYMBOL(drm_dp_read_mst_cap);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index b6d45ab41ff7..3fb9a5ac1551 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -4046,7 +4046,7 @@ intel_dp_can_mst(struct intel_dp *intel_dp)
return i915->display.params.enable_dp_mst &&
intel_dp_mst_source_support(intel_dp) &&
- drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd);
+ drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd) == DRM_DP_MST;
}
static void
@@ -4055,7 +4055,7 @@ 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 = drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd);
+ bool sink_can_mst = drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd) == DRM_DP_MST;
drm_dbg_kms(&i915->drm,
"[ENCODER:%d:%s] MST support: port: %s, sink: %s, modparam: %s\n",
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 7de7707ec6a8..fb06ee17d9e5 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -181,7 +181,7 @@ nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
if (nouveau_mst) {
mstm = outp->dp.mstm;
if (mstm)
- mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd);
+ mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd) == DRM_DP_MST;
}
if (nouveau_dp_has_sink_count(connector, outp)) {
diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
index 9b19d8bd520a..3c9e128c444a 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -818,7 +818,28 @@ 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]);
+/**
+ * enum drm_dp_mst_mode - sink's MST mode capability
+ */
+enum drm_dp_mst_mode {
+ /**
+ * @DRM_DP_SST: The sink does not support MST nor single stream sideband
+ * messaging.
+ */
+ DRM_DP_SST,
+ /**
+ * @DRM_DP_MST: Sink supports MST, more than one stream and single
+ * stream sideband messaging.
+ */
+ DRM_DP_MST,
+ /**
+ * @DRM_DP_SST_SIDEBAND_MSG: Sink supports only one stream and single
+ * stream sideband messaging.
+ */
+ DRM_DP_SST_SIDEBAND_MSG,
+};
+
+enum drm_dp_mst_mode 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_handle_event(struct drm_dp_mst_topology_mgr *mgr,