drm/v3d: Enable Performance Counters before clearing them

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[ Upstream commit c98b10496b ]

On the Raspberry Pi 5, performance counters are not being cleared
when `v3d_perfmon_start()` is called, even though we write to the
CLR register. As a result, their values accumulate until they
overflow.

The expected behavior is for performance counters to reset to zero
at the start of a job. When the job finishes and the perfmon is
stopped, the counters should accurately reflect the values for that
specific job.

To ensure this behavior, the performance counters are now enabled
before being cleared. This allows the CLR register to function as
intended, zeroing the counter values when the job begins.

Fixes: 26a4dc29b7 ("drm/v3d: Expose performance counters to userspace")
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241204122831.17015-1-mcanal@igalia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Maíra Canal 2024-12-04 09:28:31 -03:00 • committed by Greg Kroah-Hartman

parent cd5106c77d

commit c8504c0f1f

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/v3d/v3d_perfmon.c

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