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| author | Amelie Delaunay <amelie.delaunay@foss.st.com> | 2022-03-30 13:36:45 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-04-11 16:28:19 +0300 |
| commit | ec834f1cc7cf471b090bb0a6ee077a7bb90a3549 (patch) | |
| tree | 58dccce34c99b7c5f7eadbdb8df198f139746ab4 /Documentation/driver-api/dmaengine/provider.rst | |
| parent | 105989311442e4d74a0226e555503dd57aa1e896 (diff) | |
| download | linux-ec834f1cc7cf471b090bb0a6ee077a7bb90a3549.tar.xz | |
dmaengine: stm32-mdma: check the channel availability (secure or not)
STM32_MDMA_CCR bit[8] is used to enable Secure Mode (SM). If this bit is
set, it means that all the channel registers are write-protected. So the
channel is not available for Linux use.
Add stm32_mdma_filter_fn() callback filter and give it to
__dma_request_chan (instead of dma_get_any_slave_channel()), to exclude the
channel if it is marked Secure.
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20220330103645.99969-1-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'Documentation/driver-api/dmaengine/provider.rst')
0 files changed, 0 insertions, 0 deletions