linux-kernel - Re: [PATCH v6 1/6] tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state

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Date:   Tue, 30 Jun 2020 08:31:02 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, robdclark@...omium.org,
        robdclark@...il.com, stanimir.varbanov@...aro.org
Cc:     viresh.kumar@...aro.org, mka@...omium.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Akash Asthana <akashast@...eaurora.org>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v6 1/6] tty: serial: qcom_geni_serial: Use OPP API to set
 clk/perf state



On 6/30/2020 4:47 AM, Stephen Boyd wrote:
> Quoting Rajendra Nayak (2020-06-15 05:02:39)
>> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
>> index 457c0bf..a90f8ec 100644
>> --- a/drivers/tty/serial/qcom_geni_serial.c
>> +++ b/drivers/tty/serial/qcom_geni_serial.c
>> @@ -9,6 +9,7 @@
>>   #include <linux/module.h>
>>   #include <linux/of.h>
>>   #include <linux/of_device.h>
>> +#include <linux/pm_opp.h>
>>   #include <linux/platform_device.h>
>>   #include <linux/pm_runtime.h>
>>   #include <linux/pm_wakeirq.h>
>> @@ -962,7 +963,7 @@ static void qcom_geni_serial_set_termios(struct uart_port *uport,
>>                  goto out_restart_rx;
>>   
>>          uport->uartclk = clk_rate;
>> -       clk_set_rate(port->se.clk, clk_rate);
>> +       dev_pm_opp_set_rate(uport->dev, clk_rate);
> 
> If there isn't an OPP table for the device because it is optional then
> how can we unconditionally call dev_pm_opp_set_rate()?

because we have 'aca48b6 opp: Manage empty OPP tables with clk handle' to handle this.

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