Re: [PATCH] drm/amd/display: Don't require DMUB PSR caps before DCN 3.0

[Ray Wu]

Hi Hugo,

Thanks. I've attached the patch here.

There's also a related discussion here:
https://gitlab.freedesktop.org/drm/amd/-/work_items/5993

Please give it a try and let me know if it resolves the issue.
If so, I'll add your Tested-by.

Thanks,
Ray

On 11/4/2026 6:17 PM, Hugo Sales wrote:

On 11/04/2026 9:31 AM WET Ray Wu <ray...@amd.com> wrote:

We already have a similar fix internally that is planned for an upcoming DC 
release:

commit: drm/amd/display: Allow DC_PSR_MASK to enable PSR without DMUB PSR cap

Could you give it a try and see if it resolves the issue?

Hi Ray,

Happy to test it, but I can't find that commit. It isn't on amd-gfx and
it isn't in amd-staging-drm-next yet. Could you post it to the list, or
send it to me directly?

I'll try it on my ROG Flow X13 (DCN 2.1) with PSR. Since my patch reported the 
same problem, could the commit also carry a
Reported-by/Tested-by for me?

Thanks,
Hugo

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 dbad0a6d3a2b..295b1c307fa3 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
@@ -111,7 +111,8 @@ bool amdgpu_dm_set_psr_caps(struct dc_link *link, struct 
amdgpu_dm_connector *ac
        /* Reset psr version first */
        link->psr_settings.psr_version = DC_PSR_VERSION_UNSUPPORTED;
 
-       if (!dc->caps.dmub_caps.psr)
+       /* DCN IPs that never query DMUB feature caps rely on DC_PSR_MASK to 
opt in */
+       if (!dc->caps.dmub_caps.psr && !(amdgpu_dc_feature_mask & DC_PSR_MASK))
                return false;
 
        if (!(link->connector_signal & SIGNAL_TYPE_EDP))