linux-kernel - [PATCH 00/12] media: stm32: dcmi: stability & performance enhancements

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Message-ID: <20251218-stm32-dcmi-dma-chaining-v1-0-39948ca6cbf6@foss.st.com>
Date: Thu, 18 Dec 2025 19:44:40 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: Hugues Fruchet <hugues.fruchet@...s.st.com>,
        Mauro Carvalho Chehab
	<mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre
 Torgue" <alexandre.torgue@...s.st.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König
	<christian.koenig@....com>
CC: <linux-media@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>,
        Alain Volmat <alain.volmat@...s.st.com>
Subject: [PATCH 00/12] media: stm32: dcmi: stability & performance
 enhancements

This series improve stability of the capture by fixing the
handling of the overrun which was leading to captured
frame corruption.
Locking within the driver is also simplified and the way
DMA is handled is reworked allowing to avoid having a
specific handling for the JPEG data.

Performances of capture can now be increased via the usage
of a DMA->MDMA chaining which allows for capture of higher
resolution / framerate.

Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
---
Alain Volmat (12):
      media: stm32: dcmi: Switch from __maybe_unused to pm_sleep_ptr()
      media: stm32: dcmi: perform dmaengine_slave_config at probe
      media: stm32: dcmi: only create dma descriptor once at buf_prepare
      media: stm32: dcmi: stop the dma transfer on overrun
      media: stm32: dcmi: rework spin_lock calls
      media: stm32: dcmi: perform all dma handling within irq_thread
      media: stm32: dcmi: use dmaengine_terminate_async in irq context
      media: stm32: dcmi: continuous mode capture in JPEG
      dt-bindings: media: st: dcmi: add DMA-MDMA chaining properties
      media: stm32: dcmi: addition of DMA-MDMA chaining support
      ARM: dts: stm32: add sram node within stm32mp151.dtsi
      ARM: dts: stm32: enable DCMI DMA-MDMA chaining on stm32mp157c-ev1.dts

 .../devicetree/bindings/media/st,stm32-dcmi.yaml   |  13 +-
 arch/arm/boot/dts/st/stm32mp151.dtsi               |   8 +
 arch/arm/boot/dts/st/stm32mp157c-ev1.dts           |  15 +
 drivers/media/platform/st/stm32/stm32-dcmi.c       | 470 ++++++++++++++-------
 4 files changed, 341 insertions(+), 165 deletions(-)
---
base-commit: f7231cff1f3ff8259bef02dc4999bc132abf29cf
change-id: 20251213-stm32-dcmi-dma-chaining-9ea1da83007d

Best regards,
-- 
Alain Volmat <alain.volmat@...s.st.com>