Re: [PATCH 04/18] drm/amd/display: Skip writeback connector when we get amdgpu_dm_connector

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Reviewed-by: Alex Hung <alex.hung@xxxxxxx>

On 2023-08-16 15:26, Alex Hung wrote:
From: Harry Wentland <harry.wentland@xxxxxxx>

[WHY]
Writeback connectors are based on a different object:
drm_writeback_connector, and are therefore different from
amdgpu_dm_connector. We need to be careful to ensure code
designed for amdgpu_dm_connector doesn't inadvertently try
to operate on a drm_writeback_connector.

[HOW]
Skip them when connector type is DRM_MODE_CONNECTOR_WRITEBACK.

Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
---
  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 62 +++++++++++++++++--
  .../drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c |  3 +
  .../drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c | 22 +++++--
  3 files changed, 76 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 445369afcead..363d91d49a3a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -721,6 +721,10 @@ static void dmub_hpd_callback(struct amdgpu_device *adev,
drm_connector_list_iter_begin(dev, &iter);
  	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
  		if (link && aconnector->dc_link == link) {
  			if (notify->type == DMUB_NOTIFICATION_HPD)
@@ -945,6 +949,10 @@ static int amdgpu_dm_audio_component_get_eld(struct device *kdev, int port,
drm_connector_list_iter_begin(dev, &conn_iter);
  	drm_for_each_connector_iter(connector, &conn_iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
  		if (aconnector->audio_inst != port)
  			continue;
@@ -2270,6 +2278,10 @@ static int detect_mst_link_for_all_connectors(struct drm_device *dev)
drm_connector_list_iter_begin(dev, &iter);
  	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
  		if (aconnector->dc_link->type == dc_connection_mst_branch &&
  		    aconnector->mst_mgr.aux) {
@@ -2350,6 +2362,10 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend)
drm_connector_list_iter_begin(dev, &iter);
  	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
  		if (aconnector->dc_link->type != dc_connection_mst_branch ||
  		    aconnector->mst_root)
@@ -2865,6 +2881,10 @@ static int dm_resume(void *handle)
  	/* Do detection*/
  	drm_connector_list_iter_begin(ddev, &iter);
  	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
if (!aconnector->dc_link)
@@ -3416,6 +3436,9 @@ static void register_hpd_handlers(struct amdgpu_device *adev)
  	list_for_each_entry(connector,
  			&dev->mode_config.connector_list, head)	{
+ if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
  		dc_link = aconnector->dc_link;
@@ -5413,10 +5436,13 @@ static void fill_stream_properties_from_drm_display_mode(
  {
  	struct dc_crtc_timing *timing_out = &stream->timing;
  	const struct drm_display_info *info = &connector->display_info;
-	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct amdgpu_dm_connector *aconnector = NULL;
  	struct hdmi_vendor_infoframe hv_frame;
  	struct hdmi_avi_infoframe avi_frame;
+ if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
+		aconnector = to_amdgpu_dm_connector(connector);
+
  	memset(&hv_frame, 0, sizeof(hv_frame));
  	memset(&avi_frame, 0, sizeof(avi_frame));
@@ -6843,6 +6869,9 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state, for_each_new_connector_in_state(state, connector, new_con_state, i) { + if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
if (!aconnector->mst_output_port)
@@ -8392,6 +8421,9 @@ static void amdgpu_dm_commit_audio(struct drm_device *dev,
  		if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
  			continue;
+ if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  notify:
  		aconnector = to_amdgpu_dm_connector(connector);
@@ -8425,6 +8457,9 @@ static void amdgpu_dm_commit_audio(struct drm_device *dev,
  		if (!status)
  			continue;
+ if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
mutex_lock(&adev->dm.audio_lock);
@@ -8686,7 +8721,12 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
  	for_each_oldnew_connector_in_state(state, connector, old_con_state, new_con_state, i) {
  		struct dm_connector_state *dm_new_con_state = to_dm_connector_state(new_con_state);
  		struct amdgpu_crtc *acrtc = to_amdgpu_crtc(dm_new_con_state->base.crtc);
-		struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+		struct amdgpu_dm_connector *aconnector;
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
+		aconnector = to_amdgpu_dm_connector(connector);
if (!adev->dm.hdcp_workqueue)
  			continue;
@@ -9029,10 +9069,15 @@ static int dm_force_atomic_commit(struct drm_connector *connector)
  void dm_restore_drm_connector_state(struct drm_device *dev,
  				    struct drm_connector *connector)
  {
-	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct amdgpu_dm_connector *aconnector;
  	struct amdgpu_crtc *disconnected_acrtc;
  	struct dm_crtc_state *acrtc_state;
+ if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+		return;
+
+	aconnector = to_amdgpu_dm_connector(connector);
+
  	if (!aconnector->dc_sink || !connector->state || !connector->encoder)
  		return;
@@ -9109,12 +9154,16 @@ static void get_freesync_config_for_crtc(
  	struct dm_connector_state *new_con_state)
  {
  	struct mod_freesync_config config = {0};
-	struct amdgpu_dm_connector *aconnector =
-			to_amdgpu_dm_connector(new_con_state->base.connector);
+	struct amdgpu_dm_connector *aconnector;
  	struct drm_display_mode *mode = &new_crtc_state->base.mode;
  	int vrefresh = drm_mode_vrefresh(mode);
  	bool fs_vid_mode = false;
+ if (new_con_state->base.connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+		return;
+
+	aconnector = to_amdgpu_dm_connector(new_con_state->base.connector);
+
  	new_crtc_state->vrr_supported = new_con_state->freesync_capable &&
  					vrefresh >= aconnector->min_vfreq &&
  					vrefresh <= aconnector->max_vfreq;
@@ -9898,6 +9947,9 @@ static int add_affected_mst_dsc_crtcs(struct drm_atomic_state *state, struct drm
  		if (conn_state->crtc != crtc)
  			continue;
+ if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
  		aconnector = to_amdgpu_dm_connector(connector);
  		if (!aconnector->mst_output_port || !aconnector->mst_root)
  			aconnector = NULL;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c
index 52ecfa746b54..f936a35fa9eb 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c
@@ -326,6 +326,9 @@ int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
  			if (!connector->state || connector->state->crtc != crtc)
  				continue;
+ if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+				continue;
+
  			aconn = to_amdgpu_dm_connector(connector);
  			break;
  		}
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
index 51467f132c26..58b880acb087 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
@@ -894,10 +894,15 @@ void amdgpu_dm_hpd_init(struct amdgpu_device *adev)
drm_connector_list_iter_begin(dev, &iter);
  	drm_for_each_connector_iter(connector, &iter) {
-		struct amdgpu_dm_connector *amdgpu_dm_connector =
-				to_amdgpu_dm_connector(connector);
+		struct amdgpu_dm_connector *amdgpu_dm_connector;
+		const struct dc_link *dc_link;
- const struct dc_link *dc_link = amdgpu_dm_connector->dc_link;
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
+		amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
+
+		dc_link = amdgpu_dm_connector->dc_link;
if (dc_link->irq_source_hpd != DC_IRQ_SOURCE_INVALID) {
  			dc_interrupt_set(adev->dm.dc,
@@ -930,9 +935,14 @@ void amdgpu_dm_hpd_fini(struct amdgpu_device *adev)
drm_connector_list_iter_begin(dev, &iter);
  	drm_for_each_connector_iter(connector, &iter) {
-		struct amdgpu_dm_connector *amdgpu_dm_connector =
-				to_amdgpu_dm_connector(connector);
-		const struct dc_link *dc_link = amdgpu_dm_connector->dc_link;
+		struct amdgpu_dm_connector *amdgpu_dm_connector;
+		const struct dc_link *dc_link;
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
+		amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
+		dc_link = amdgpu_dm_connector->dc_link;
if (dc_link->irq_source_hpd != DC_IRQ_SOURCE_INVALID) {
  			dc_interrupt_set(adev->dm.dc,



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