drm/panfrost: Perform hard reset to recover GPU if soft reset fails

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Even though soft reset should ideally never fail, during development of
some power management features I managed to get some bits wrong: this
resulted in GPU soft reset failures, where the GPU was never able to
recover, not even after suspend/resume cycles, meaning that the only
way to get functionality back was to reboot the machine.

Perform a hard reset after a soft reset failure to be able to recover
the GPU during runtime (so, without any machine reboot).

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231109102543.42971-2-angelogioacchino.delregno@collabora.com

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AngeloGioacchino Del Regno 2023-11-09 11:25:38 +01:00 • committed by Steven Price

parent 22aa1a2090

commit 57d4e26717

2 changed files with 11 additions and 3 deletions

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13

drivers/gpu/drm/panfrost/panfrost_gpu.c

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1

drivers/gpu/drm/panfrost/panfrost_regs.h

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