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dmaengine: stm32-mdma: correct desc prep when channel running
commit 03f25d5 upstream. In case of the prep descriptor while the channel is already running, the CCR register value stored into the channel could already have its EN bit set. This would lead to a bad transfer since, at start transfer time, enabling the channel while other registers aren't yet properly set. To avoid this, ensure to mask the CCR_EN bit when storing the ccr value into the mdma channel structure. Fixes: a4ffb13 ("dmaengine: Add STM32 MDMA driver") Signed-off-by: Alain Volmat <alain.volmat@foss.st.com> Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> Cc: stable@vger.kernel.org Tested-by: Alain Volmat <alain.volmat@foss.st.com> Link: https://lore.kernel.org/r/20231009082450.452877-1-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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