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From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: satya priya <skakit@codeaurora.org>, gregkh@linuxfoundation.org
Cc: Matthias Kaehlcke <mka@chromium.org>,
	Andy Gross <agross@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, akashast@codeaurora.org,
	rojay@codeaurora.org, msavaliy@qti.qualcomm.com,
	dianders@chromium.org
Subject: Re: [PATCH V5 4/4] tty: serial: qcom_geni_serial: Fix the UART wakeup issue
Date: Thu, 10 Sep 2020 23:06:39 +0000	[thread overview]
Message-ID: <20200910230639.GB472@uller> (raw)
In-Reply-To: <1599742438-16811-5-git-send-email-skakit@codeaurora.org>

On Thu 10 Sep 12:53 UTC 2020, satya priya wrote:

> 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.
> 

Seems reasonable.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> Signed-off-by: satya priya <skakit@codeaurora.org>
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Greg, I don't see this depending on anything else, will you pick this
patch through your tree? I will take the dts patches through the qcom
tree.

Regards,
Bjorn

> 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
> 

  reply	other threads:[~2020-09-10 23:06 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10 12:53 [PATCH V5 0/4] Add wakeup support over UART RX satya priya
2020-09-10 12:53 ` [PATCH V5 1/4] arm64: dts: qcom: sc7180: Improve the pin config settings for CTS and TX satya priya
2020-09-10 14:40   ` Doug Anderson
2020-09-11 10:14     ` skakit
2020-09-10 12:53 ` [PATCH V5 2/4] arm64: dts: qcom: sc7180: Add necessary pinctrl and interrupt config for BT UART satya priya
2020-09-10 14:40   ` Doug Anderson
2020-09-11 10:15     ` skakit
2020-09-11 13:52       ` Bjorn Andersson
2020-09-11 15:30         ` Doug Anderson
2020-09-10 15:35   ` Matthias Kaehlcke
2020-09-11 10:15     ` skakit
2020-09-10 23:45   ` Bjorn Andersson
2020-09-11 10:16     ` skakit
2020-09-10 12:53 ` [PATCH V5 3/4] arm64: dts: qcom: sc7180-trogdor: Add " satya priya
2020-09-10 14:42   ` Doug Anderson
2020-09-11 10:15     ` skakit
2020-09-10 12:53 ` [PATCH V5 4/4] tty: serial: qcom_geni_serial: Fix the UART wakeup issue satya priya
2020-09-10 23:06   ` Bjorn Andersson [this message]
2020-09-16 12:25     ` Greg KH

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