media: rz2gl-cru: Introduce a spinlock for hw operations

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The CRU driver uses a single spinlock to protect the buffers queue and
the hardware operations.

This single spinlock is held for the whole duration of the interrupt
handler, causing all other driver's operations to freeze.

Under heavy system stress conditions with userspace not providing
buffers fast enough, this causes loss of frames.

Prepare to re-work the driver locking by introducing (but not using yet)
a new spinlock to protect the hardware registers programming.

Signed-off-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>
Reviewed-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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Jacopo Mondi 2026-02-11 09:17:23 +01:00 • committed by Hans Verkuil

parent a8de479fab

commit c3e0b2e34e

2 changed files with 8 additions and 3 deletions

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10

drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h

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1

drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c

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