Reviewed-by: Alex Hung <alex.h...@amd.com>

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

[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.wentl...@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
  .../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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