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(a)foss.st.com>
---
Changes in v2:
- Fix pm_sleep_ptr -> pm_ptr to avoid unused function warning
- Fix typo / remove useless comment in binding
- Link to v1: https://lore.kernel.org/r/20251218-stm32-dcmi-dma-chaining-v1-0-39948ca6cbf…
---
Alain Volmat (12):
media: stm32: dcmi: Switch from __maybe_unused to pm_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 | 11 +-
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 | 475 +++++++++++++--------
4 files changed, 341 insertions(+), 168 deletions(-)
---
base-commit: f7231cff1f3ff8259bef02dc4999bc132abf29cf
change-id: 20251213-stm32-dcmi-dma-chaining-9ea1da83007d
Best regards,
--
Alain Volmat <alain.volmat(a)foss.st.com>
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This patch introduces a new heap driver to expose DT non‑reusable
"shared-dma-pool" coherent regions as dma-buf heaps, so userspace can
allocate buffers from each reserved, named region.
Because these regions are device‑dependent, each heap instance binds a
heap device to its reserved‑mem region via a newly introduced helper
function -namely, of_reserved_mem_device_init_with_mem()- so coherent
allocations use the correct dev->dma_mem.
Charging to cgroups for these buffers is intentionally left out to keep
review focused on the new heap; I plan to follow up based on Eric’s [1]
and Maxime’s [2] work on dmem charging from userspace.
This series also makes the new heap driver modular, in line with the CMA
heap change in [3].
[1] https://lore.kernel.org/all/20260218-dmabuf-heap-cma-dmem-v2-0-b249886fb7b2…
[2] https://lore.kernel.org/all/20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.…
[3] https://lore.kernel.org/all/20260303-dma-buf-heaps-as-modules-v3-0-24344812…
Signed-off-by: Albert Esteve <aesteve(a)redhat.com>
---
Changes in v2:
- Removed dmem charging parts
- Moved coherent heap registering logic to coherent.c
- Made heap device a member of struct dma_heap
- Split dma_heap_add logic into create/register, to be able to
access the stored heap device before registered.
- Avoid platform device in favour of heap device
- Added a wrapper to rmem device_init() op
- Switched from late_initcall() to module_init()
- Made the coherent heap driver modular
- Link to v1: https://lore.kernel.org/r/20260224-b4-dmabuf-heap-coherent-rmem-v1-1-dffef4…
---
Albert Esteve (5):
dma-buf: dma-heap: split dma_heap_add
of_reserved_mem: add a helper for rmem device_init op
dma-buf: heaps: Add Coherent heap to dmabuf heaps
dma: coherent: register to coherent heap
dma-buf: heaps: coherent: Turn heap into a module
John Stultz (1):
dma-buf: dma-heap: Keep track of the heap device struct
drivers/dma-buf/dma-heap.c | 138 +++++++++--
drivers/dma-buf/heaps/Kconfig | 9 +
drivers/dma-buf/heaps/Makefile | 1 +
drivers/dma-buf/heaps/coherent_heap.c | 429 ++++++++++++++++++++++++++++++++++
drivers/of/of_reserved_mem.c | 27 ++-
include/linux/dma-heap.h | 16 ++
include/linux/dma-map-ops.h | 7 +
include/linux/of_reserved_mem.h | 8 +
kernel/dma/coherent.c | 34 +++
9 files changed, 642 insertions(+), 27 deletions(-)
---
base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
change-id: 20260223-b4-dmabuf-heap-coherent-rmem-91fd3926afe9
Best regards,
--
Albert Esteve <aesteve(a)redhat.com>