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 08:35:52 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        robdclark@...omium.org, robdclark@...il.com,
        stanimir.varbanov@...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 30-06-20, 08:31, Rajendra Nayak wrote:
> 
> 
> 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()?

Looks like some *Maintainers* aren't paying enough attention lately ;)

Just kidding.

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

-- 
viresh