[PATCH v2 2/8] serial: qcom-geni: fix false console tx restart

Johan Hovold
2024-09-06T13:14:58Z

Commit 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang")
addressed an issue with stalled tx after the console code interrupted
the last bytes of a tx command by reenabling the watermark interrupt if
there is data in write buffer. This can however break software flow
control by re-enabling tx after the user has stopped it.

Address the original issue by not clearing the CMD_DONE flag after
polling for command completion. This allows the interrupt handler to
start another transfer when the CMD_DONE interrupt has not been disabled
due to flow control.

Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP")
Fixes: 663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang")
Cc: stable@vger.kernel.org # 4.17
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
drivers/tty/serial/qcom_geni_serial.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 309c0bddf26a..b88435c0ea50 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -306,18 +306,16 @@ static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size)
static void qcom_geni_serial_poll_tx_done(struct uart_port *uport)
{
int done;
- u32 irq_clear = M_CMD_DONE_EN;

done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_DONE_EN, true);
if (!done) {
writel(M_GENI_CMD_ABORT, uport->membase +
SE_GENI_M_CMD_CTRL_REG);
- irq_clear |= M_CMD_ABORT_EN;
qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_CMD_ABORT_EN, true);
+ writel(M_CMD_ABORT_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
}
- writel(irq_clear, uport->membase + SE_GENI_M_IRQ_CLEAR);
}

static void qcom_geni_serial_abort_rx(struct uart_port *uport)
@@ -378,6 +376,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
unsigned char c)
{
writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
+ writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
qcom_geni_serial_setup_tx(uport, 1);
WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
M_TX_FIFO_WATERMARK_EN, true));
@@ -422,6 +421,7 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
}

writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
+ writel(M_CMD_DONE_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
qcom_geni_serial_setup_tx(uport, bytes_to_send);
for (i = 0; i < count; ) {
size_t chars_to_write = 0;
@@ -463,7 +463,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s,
bool locked = true;
unsigned long flags;
u32 geni_status;
- u32 irq_en;

WARN_ON(co->index < 0 || co->index >= GENI_UART_CONS_PORTS);

@@ -495,12 +494,6 @@ static void qcom_geni_serial_console_write(struct console *co, const char *s,
* has been sent, in which case we need to look for done first.
*/
qcom_geni_serial_poll_tx_done(uport);
-
- if (!kfifo_is_empty(&uport->state->port.xmit_fifo)) {
- irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
- writel(irq_en | M_TX_FIFO_WATERMARK_EN,
- uport->membase + SE_GENI_M_IRQ_EN);
- }
}

__qcom_geni_serial_console_write(uport, s, count);
--
2.44.2