Messages in this thread Patch in this message | | | From | satya priya <> | Subject | [PATCH V5 4/4] tty: serial: qcom_geni_serial: Fix the UART wakeup issue | Date | Thu, 10 Sep 2020 18:23:58 +0530 |
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As a part of system suspend uart_port_suspend is called from the Serial driver, which calls set_mctrl passing mctrl as 0. This makes RFR high(NOT_READY) during suspend.
Due to this BT SoC is not able to send wakeup bytes to UART during suspend. Include if check for non-suspend case to keep RFR low during suspend.
Signed-off-by: satya priya <skakit@codeaurora.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Akash Asthana <akashast@codeaurora.org> --- Changes in V2: - This patch fixes the UART flow control issue during suspend. Newly added in V2.
Changes in V3: - As per Matthias's comment removed the extra parentheses.
Changes in V4: - No change.
Changes in V5: - As per Matthias comment, fixed nit-pick in commit text.
drivers/tty/serial/qcom_geni_serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 3aa29d2..bc63c54 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -242,7 +242,7 @@ static void qcom_geni_serial_set_mctrl(struct uart_port *uport, if (mctrl & TIOCM_LOOP) port->loopback = RX_TX_CTS_RTS_SORTED; - if (!(mctrl & TIOCM_RTS)) + if (!(mctrl & TIOCM_RTS) && !uport->suspended) uart_manual_rfr = UART_MANUAL_RFR_EN | UART_RFR_NOT_READY; writel(uart_manual_rfr, uport->membase + SE_UART_MANUAL_RFR); } -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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