drm/amdgpu/sdma5.2: Update wptr registers as well as doorbell

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commit a03ebf1163 upstream.

We seem to have a case where SDMA will sometimes miss a doorbell
if GFX is entering the powergating state when the doorbell comes in.
To workaround this, we can update the wptr via MMIO, however,
this is only safe because we disallow gfxoff in begin_ring() for
SDMA 5.2 and then allow it again in end_ring().

Enable this workaround while we are root causing the issue with
the HW team.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/3440
Tested-by: Friedrich Vock <friedrich.vock@gmx.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
(cherry picked from commit f2ac526349)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Alex Deucher 2024-07-09 17:54:11 -04:00 • committed by Greg Kroah-Hartman

parent 145d4dd823

commit 3ff604499e

1 changed files with 12 additions and 0 deletions

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drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c

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