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Date:   Wed, 19 Aug 2020 19:19:39 +0530
From:   skakit@codeaurora.org
To:     Matthias Kaehlcke <mka@chromium.org>
Cc:     Bjorn Andersson <bjorn.andersson@linaro.org>,
        gregkh@linuxfoundation.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
Subject: Re: [PATCH V2 3/3] tty: serial: qcom_geni_serial: Fix the UART wakeup
 issue
In-Reply-To: <20200817174222.GC2995789@google.com>
References: <1595563082-2353-1-git-send-email-skakit@codeaurora.org>
 <1595563082-2353-4-git-send-email-skakit@codeaurora.org>
 <20200817174222.GC2995789@google.com>
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On 2020-08-17 23:12, Matthias Kaehlcke wrote:
> On Fri, Jul 24, 2020 at 09:28:02AM +0530, satya priya wrote:
>> As a part of system suspend we call uart_port_suspend from the
>> Serial driver, which calls set_mctrl passing mctrl as NULL. This
>> makes RFR high(NOT_READY) during suspend.
>> 
>> Due to this BT SoC is not able to send wakeup bytes to UART during
>> suspend. Included if check for non-suspend case to keep RFR low
>> during suspend.
>> 
>> Signed-off-by: satya priya <skakit@codeaurora.org>
>> ---
>> Changes in V2:
>>  - This patch fixes the UART flow control issue during suspend.
>>    Newly added in V2.
>> 
>>  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 07b7b6b..7108dfc 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)))
> 
> Why all these parentheses, instead of:
> 
>     	if (!(mctrl & TIOCM_RTS) && !uport->suspended)
> 
> ?

ok. Will remove the extra parentheses.