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Date:   Thu, 14 Apr 2022 12:45:36 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Alex Deucher <alexander.deucher@amd.com>
Cc:     stable@vger.kernel.org,
        Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>,
        Eric Yang <Eric.Yang2@amd.com>,
        Harry Wentland <harry.wentland@amd.com>, richard.gong@amd.com
Subject: Re: [PATCH 1/2] drm/amd/display: Add pstate verification and
 recovery for DCN31
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References: <20220413153339.1436168-1-alexander.deucher@amd.com>
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On Wed, Apr 13, 2022 at 11:33:38AM -0400, Alex Deucher wrote:
> From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
> 
> [Why]
> To debug when p-state is being blocked and avoid PMFW hangs when
> it does occur.
> 
> [How]
> Re-use the DCN10 hardware sequencer by adding a new interface for
> verifying p-state high on the hubbub. The interface is mostly the
> same as the DCN10 interface, but the bit definitions have changed for
> the debug bus.
> 
> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
> Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
> Reviewed-by: Harry Wentland <harry.wentland@amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> (cherry picked from commit e7031d8258f1b4d6d50e5e5b5d92ba16f66eb8b4)
> Cc: richard.gong@amd.com
> Cc: nicholas.kazlauskas@amd.com
> Cc: stable@vger.kernel.org # 3.15.x

This does not apply to all of those kernels.  Please provide backports
for the ones you want it applied to older than 5.15.y

thanks,

greg k-h