linux-kernel - [PATCH v2 0/6] serial: stm32: improve DMA pause and resume

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Date:   Tue, 8 Aug 2023 18:19:00 +0200
From:   Valentin Caron <valentin.caron@...s.st.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Jiri Slaby <jirislaby@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Valentin Caron <valentin.caron@...s.st.com>
Subject: [PATCH v2 0/6] serial: stm32: improve DMA pause and resume

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