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[v2,0/6] serial: stm32: improve DMA pause and resume

Message ID 20230808161906.178996-1-valentin.caron@foss.st.com
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Series serial: stm32: improve DMA pause and resume | expand

Message

Valentin Caron Aug. 8, 2023, 4:19 p.m. UTC 
This series improves DMA management in stm32-usart driver.

It is not recommended to switch DMAT and DMAR bits when a DMA transfer
is in progress. This is going to be replaced by dmaengine_pause or
dmaengine_resume.

stm32_usart_rx_dma_pause, stm32_usart_rx_dma_resume, stm32_usart_tx_dma_pause
and stm32_usart_tx_dma_resume functions, are all redirected to a single function,
called "stm32_usart_dma_pause_resume", that has been created to simplify dma
pause/resume.

Since v1:
- Add my Signed-off in Amelie's patch.

Amelie Delaunay (1):
  serial: stm32: synchronize RX DMA channel in shutdown

Valentin Caron (5):
  serial: stm32: avoid clearing DMAT bit during transfer
  serial: stm32: use DMAT as a configuration bit
  serial: stm32: modify parameter and rename stm32_usart_rx_dma_enabled
  serial: stm32: group dma pause/resume error handling into single
    function
  serial: stm32: replace access to DMAR bit by dmaengine_pause/resume

 drivers/tty/serial/stm32-usart.c | 307 ++++++++++++++++++-------------
 drivers/tty/serial/stm32-usart.h |   1 +
 2 files changed, 185 insertions(+), 123 deletions(-)