This is a note to let you know that I've just added the patch titled
tty: serial: qcom-geni-serial: Poll primary sequencer irq status after cancel_tx
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tty-serial-qcom-geni-serial-poll-primary-sequencer-i.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit de1f8ee448f6b21a6db30a0a256f6c019fbaa305
Author: Vijaya Krishna Nivarthi <quic_vnivarth@xxxxxxxxxxx>
Date: Wed Aug 9 16:23:13 2023 +0530
tty: serial: qcom-geni-serial: Poll primary sequencer irq status after cancel_tx
[ Upstream commit 9c8441330bb399cba6177acce9b0e68c0dbaa597 ]
TX is handled by primary sequencer. After cancelling primary command, poll
primary sequencer's irq status instead of that of secondary.
While at it, also remove a couple of redundant lines that read from IRQ_EN
register and write back same.
Fixes: 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA")
Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/1691578393-9891-1-git-send-email-quic_vnivarth@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 24ebdb0b63a8e..ae632a9d4f3ae 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -592,7 +592,6 @@ static void qcom_geni_serial_stop_tx_dma(struct uart_port *uport)
{
struct qcom_geni_serial_port *port = to_dev_port(uport);
bool done;
- u32 m_irq_en;
if (!qcom_geni_serial_main_active(uport))
return;
@@ -604,12 +603,10 @@ static void qcom_geni_serial_stop_tx_dma(struct uart_port *uport)
port->tx_remaining = 0;
}
- m_irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
- writel(m_irq_en, uport->membase + SE_GENI_M_IRQ_EN);
geni_se_cancel_m_cmd(&port->se);
- done = qcom_geni_serial_poll_bit(uport, SE_GENI_S_IRQ_STATUS,
- S_CMD_CANCEL_EN, true);
+ done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
+ M_CMD_CANCEL_EN, true);
if (!done) {
geni_se_abort_m_cmd(&port->se);
done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
