Merge tag 'v5.16-rc4' into media_tree

Linux 5.16-rc4

* tag 'v5.16-rc4': (984 commits)
  Linux 5.16-rc4
  KVM: SVM: Do not terminate SEV-ES guests on GHCB validation failure
  KVM: SEV: Fall back to vmalloc for SEV-ES scratch area if necessary
  KVM: SEV: Return appropriate error codes if SEV-ES scratch setup fails
  parisc: Mark cr16 CPU clocksource unstable on all SMP machines
  parisc: Fix "make install" on newer debian releases
  sched/uclamp: Fix rq->uclamp_max not set on first enqueue
  preempt/dynamic: Fix setup_preempt_mode() return value
  cifs: avoid use of dstaddr as key for fscache client cookie
  cifs: add server conn_id to fscache client cookie
  cifs: wait for tcon resource_id before getting fscache super
  cifs: fix missed refcounting of ipc tcon
  x86/xen: Add xenpv_restore_regs_and_return_to_usermode()
  x86/entry: Use the correct fence macro after swapgs in kernel CR3
  fget: check that the fd still exists after getting a ref to it
  x86/entry: Add a fence for kernel entry SWAPGS in paranoid_entry()
  x86/sev: Fix SEV-ES INS/OUTS instructions for word, dword, and qword
  powercap: DTPM: Drop unused local variable from init_dtpm()
  io-wq: don't retry task_work creation failure on fatal conditions
  serial: 8250_bcm7271: UART errors after resuming from S2
  ...

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 60544788e911..c8457babfdea 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -758,6 +758,18 @@ static bool detect_dp(struct dc_link *link,
 			dal_ddc_service_set_transaction_type(link->ddc,
 							     sink_caps->transaction_type);
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+			/* Apply work around for tunneled MST on certain USB4 docks. Always use DSC if dock
+			 * reports DSC support.
+			 */
+			if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
+					link->type == dc_connection_mst_branch &&
+					link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
+					link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
+					!link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around)
+				link->wa_flags.dpia_mst_dsc_always_on = true;
+#endif
+
 #if defined(CONFIG_DRM_AMD_DC_HDCP)
 			/* In case of fallback to SST when topology discovery below fails
 			 * HDCP caps will be querried again later by the upper layer (caller
@@ -1203,6 +1215,10 @@ static bool dc_link_detect_helper(struct dc_link *link,
 			LINK_INFO("link=%d, mst branch is now Disconnected\n",
 				  link->link_index);
 
+			/* Disable work around which keeps DSC on for tunneled MST on certain USB4 docks. */
+			if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
+				link->wa_flags.dpia_mst_dsc_always_on = false;
+
 			dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
 
 			link->mst_stream_alloc_table.stream_count = 0;