From: Valentin Caron <valentin.caron@foss.st.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Gerald Baeza <gerald.baeza@st.com>,
Erwan Le Ray <erwan.leray@foss.st.com>,
Valentin Caron <valentin.caron@foss.st.com>,
<linux-serial@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH 3/4] serial: stm32: fix flow control transfer in DMA mode
Date: Tue, 4 Jan 2022 19:24:44 +0100 [thread overview]
Message-ID: <20220104182445.4195-4-valentin.caron@foss.st.com> (raw)
In-Reply-To: <20220104182445.4195-1-valentin.caron@foss.st.com>
If flow control is enabled, framework will call stop_tx to
pause transfer and then call start_tx to resume transfer.
Clear USART_CR3_DMAT bit in stop_tx ops to pause DMA transfer.
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
---
drivers/tty/serial/stm32-usart.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 52755a576bc2..788e002688f2 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -707,8 +707,11 @@ static void stm32_usart_stop_tx(struct uart_port *port)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct serial_rs485 *rs485conf = &port->rs485;
+ const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
stm32_usart_tx_interrupt_disable(port);
+ if (stm32_usart_tx_dma_started(stm32_port) && stm32_usart_tx_dma_enabled(stm32_port))
+ stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
if (rs485conf->flags & SER_RS485_ENABLED) {
if (rs485conf->flags & SER_RS485_RTS_ON_SEND) {
--
2.17.1
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next prev parent reply other threads:[~2022-01-04 18:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-04 18:24 [PATCH 0/4] Add improvements for STM32 USART DMA TX Valentin Caron
2022-01-04 18:24 ` [PATCH 1/4] serial: stm32: move tx dma terminate DMA to shutdown Valentin Caron
2022-01-04 18:24 ` [PATCH 2/4] serial: stm32: rework TX DMA state condition Valentin Caron
2022-01-04 18:24 ` Valentin Caron [this message]
2022-01-04 18:24 ` [PATCH 4/4] serial: stm32: correct loop for dma error handling Valentin Caron
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