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(-)
--
2.25.1
