[PATCH 6.10 04/22] drm/amd/display: Prevent IPX From Link Detect and Set Mode

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fangzhi Zuo <jerry.zuo@amd.com>

commit 1ff6631baeb1f5d69be192732d0157a06b43f20a upstream.

IPX involvment proven to affect LT, causing link loss. Need to prevent
IPX enabled in LT process in which link detect and set mode are main
procedures that have LT taken place.

Reviewed-by: Roman Li <roman.li@amd.com>
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Kevin Holm <kevin@holm.dev>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2943,6 +2943,7 @@ static int dm_resume(void *handle)
 
 		commit_params.streams = dc_state->streams;
 		commit_params.stream_count = dc_state->stream_count;
+		dc_exit_ips_for_hw_access(dm->dc);
 		WARN_ON(!dc_commit_streams(dm->dc, &commit_params));
 
 		dm_gpureset_commit_state(dm->cached_dc_state, dm);
@@ -3015,6 +3016,7 @@ static int dm_resume(void *handle)
 			emulated_link_detect(aconnector->dc_link);
 		} else {
 			mutex_lock(&dm->dc_lock);
+			dc_exit_ips_for_hw_access(dm->dc);
 			dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);
 			mutex_unlock(&dm->dc_lock);
 		}
@@ -3351,6 +3353,7 @@ static void handle_hpd_irq_helper(struct
 	enum dc_connection_type new_connection_type = dc_connection_none;
 	struct amdgpu_device *adev = drm_to_adev(dev);
 	struct dm_connector_state *dm_con_state = to_dm_connector_state(connector->state);
+	struct dc *dc = aconnector->dc_link->ctx->dc;
 	bool ret = false;
 
 	if (adev->dm.disable_hpd_irq)
@@ -3385,6 +3388,7 @@ static void handle_hpd_irq_helper(struct
 			drm_kms_helper_connector_hotplug_event(connector);
 	} else {
 		mutex_lock(&adev->dm.dc_lock);
+		dc_exit_ips_for_hw_access(dc);
 		ret = dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);
 		mutex_unlock(&adev->dm.dc_lock);
 		if (ret) {
@@ -3444,6 +3448,7 @@ static void handle_hpd_rx_irq(void *para
 	bool has_left_work = false;
 	int idx = dc_link->link_index;
 	struct hpd_rx_irq_offload_work_queue *offload_wq = &adev->dm.hpd_rx_offload_wq[idx];
+	struct dc *dc = aconnector->dc_link->ctx->dc;
 
 	memset(&hpd_irq_data, 0, sizeof(hpd_irq_data));
 
@@ -3533,6 +3538,7 @@ out:
 			bool ret = false;
 
 			mutex_lock(&adev->dm.dc_lock);
+			dc_exit_ips_for_hw_access(dc);
 			ret = dc_link_detect(dc_link, DETECT_REASON_HPDRX);
 			mutex_unlock(&adev->dm.dc_lock);
 
@@ -4639,6 +4645,7 @@ static int amdgpu_dm_initialize_drm_devi
 			bool ret = false;
 
 			mutex_lock(&dm->dc_lock);
+			dc_exit_ips_for_hw_access(dm->dc);
 			ret = dc_link_detect(link, DETECT_REASON_BOOT);
 			mutex_unlock(&dm->dc_lock);
 
@@ -8947,6 +8954,7 @@ static void amdgpu_dm_commit_streams(str
 
 			memset(&position, 0, sizeof(position));
 			mutex_lock(&dm->dc_lock);
+			dc_exit_ips_for_hw_access(dm->dc);
 			dc_stream_program_cursor_position(dm_old_crtc_state->stream, &position);
 			mutex_unlock(&dm->dc_lock);
 		}
@@ -9016,6 +9024,7 @@ static void amdgpu_dm_commit_streams(str
 
 	dm_enable_per_frame_crtc_master_sync(dc_state);
 	mutex_lock(&dm->dc_lock);
+	dc_exit_ips_for_hw_access(dm->dc);
 	WARN_ON(!dc_commit_streams(dm->dc, &params));
 
 	/* Allow idle optimization when vblank count is 0 for display off */
@@ -9381,6 +9390,7 @@ static void amdgpu_dm_atomic_commit_tail
 
 
 		mutex_lock(&dm->dc_lock);
+		dc_exit_ips_for_hw_access(dm->dc);
 		dc_update_planes_and_stream(dm->dc,
 					    dummy_updates,
 					    status->plane_count,