From f2d92a842853fd30c8eae34a56bb3b7d403d455c Mon Sep 17 00:00:00 2001
From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Date: Sun, 23 Jan 2022 13:20:04 -0500
Subject: drm/amd/display: Use PSR version selected during set_psr_caps
Git-commit: b80ddeb29d9df449f875f0b6f5de08d7537c02b8
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
[Why]
If the DPCD caps specifies a PSR version newer than PSR_VERSION_1 then
we fallback to using PSR_VERSION_1 in amdgpu_dm_set_psr_caps.
This gets overriden with the raw DPCD value in amdgpu_dm_link_setup_psr,
which can result in DMCUB hanging if we pass in an unsupported PSR
version number.
[How]
Fix the hang by using link->psr_settings.psr_version directly during
amdgpu_dm_link_setup_psr.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c
index c510638b4f99..a009fc654ac9 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c
@@ -149,10 +149,8 @@ bool amdgpu_dm_link_setup_psr(struct dc_stream_state *stream)
link = stream->link;
- psr_config.psr_version = link->dpcd_caps.psr_caps.psr_version;
-
- if (psr_config.psr_version > 0) {
- psr_config.psr_exit_link_training_required = 0x1;
+ if (link->psr_settings.psr_version != DC_PSR_VERSION_UNSUPPORTED) {
+ psr_config.psr_version = link->psr_settings.psr_version;
psr_config.psr_frame_capture_indication_req = 0;
psr_config.psr_rfb_setup_time = 0x37;
psr_config.psr_sdp_transmit_line_num_deadline = 0x20;
--
2.38.1