linux-kernel - [PATCH 0/4] media: dw100: Dynamic vertex map updates and fixes for PREEMPT

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Message-Id: <20260105-sklug-v6-16-topic-dw100-v3-1-dev-v1-0-65af34d04fd8@ideasonboard.com>
Date: Mon, 05 Jan 2026 12:35:52 +0100
From: Stefan Klug <stefan.klug@...asonboard.com>
To: Xavier Roumegue <xavier.roumegue@....nxp.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Clark Williams <clrkwllms@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-rt-devel@...ts.linux.dev, Stefan Klug <stefan.klug@...asonboard.com>
Subject: [PATCH 0/4] media: dw100: Dynamic vertex map updates and fixes for
 PREEMPT_RT

Hi all,

This series contains a few updates to the dw100 dewarper. Patches 1-2
implement V4L2 requests support and dynamic updates of the vertex map.
This enables advanced use cases like interactive pan, zoom and rotate. A
first attempt to implement the dynamic update was posted a while back in
[1] but wasn't merged due to races in the implementation. By switching
to V4L2 requests the implementation is a lot simpler now.

Patches 3-4 fix an issue on PREEMPT_RT enabled kernels. These patches
should possibly be squashed into one. I expected patch 3 to be
sufficient but during testing I hit an error condition that is worked
around in patch 4. As I don't have documentation for the hardware it is
difficult to decide on the proper fix. So feedback on that is greatly
appreciated.

Best regards,
Stefan

[1] https://lore.kernel.org/linux-media/20241022063155.506191-1-umang.jain@ideasonboard.com/

Signed-off-by: Stefan Klug <stefan.klug@...asonboard.com>
---
Stefan Klug (4):
      media: dw100: Implement V4L2 requests support
      media: dw100: Implement dynamic vertex map update
      media: dw100: Fix kernel oops with PREEMPT_RT enabled
      media: dw100: Split interrupt handler to fix timeout error

 drivers/media/platform/nxp/dw100/dw100.c | 89 ++++++++++++++++++++++++++------
 1 file changed, 73 insertions(+), 16 deletions(-)
---
base-commit: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb
change-id: 20260105-sklug-v6-16-topic-dw100-v3-1-dev-b856657db695

Best regards,
-- 
Stefan Klug <stefan.klug@...asonboard.com>