From: Ryan Case ryandcase@chromium.org
[ Upstream commit 663abb1a7a7ff8fea9ab0145463de7fcff823755 ]
If a serial console write occured while a UART transmit command was waiting for a done signal then no further data would be sent until something new kicked the system into gear. If there is already data waiting in the circular buffer we must re-enable the tx watermark so we receive the expected interrupts.
Signed-off-by: Ryan Case ryandcase@chromium.org Reviewed-by: Evan Green evgreen@chromium.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/tty/serial/qcom_geni_serial.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index b3f7d1a..2003dfc 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -438,6 +438,7 @@ 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);
@@ -472,6 +473,13 @@ 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 (uart_circ_chars_pending(&uport->state->xmit)) { + irq_en = readl_relaxed(uport->membase + + SE_GENI_M_IRQ_EN); + writel_relaxed(irq_en | M_TX_FIFO_WATERMARK_EN, + uport->membase + SE_GENI_M_IRQ_EN); + } }
__qcom_geni_serial_console_write(uport, s, count);