On Mon, May 04, 2015 at 01:05:27PM +0200, Matthias Brugger wrote:
> 2015-04-27 8:49 GMT+02:00 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>:
> > The pm_runtime callbacks already enable and disable the device.
> > Use them in probe() and remove() instead of duplicating the
> > code. This allows us to concentrate more code for enabling/disabling
> > the UART in a single place.
> >
> > Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> > ---
> > drivers/tty/serial/8250/8250_mtk.c | 69 ++++++++++++++++++++------------------
> > 1 file changed, 36 insertions(+), 33 deletions(-)
> >
> > diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
> > index bcfaa8dc..2f28bd0 100644
> > --- a/drivers/tty/serial/8250/8250_mtk.c
> > +++ b/drivers/tty/serial/8250/8250_mtk.c
> > @@ -115,6 +115,29 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
> > tty_termios_encode_baud_rate(termios, baud, baud);
> > }
> >
> > +static int mtk8250_runtime_suspend(struct device *dev)
> > +{
> > + struct mtk8250_data *data = dev_get_drvdata(dev);
> > +
> > + clk_disable_unprepare(data->uart_clk);
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk8250_runtime_resume(struct device *dev)
> > +{
> > + struct mtk8250_data *data = dev_get_drvdata(dev);
> > + int err;
> > +
> > + err = clk_prepare_enable(data->uart_clk);
> > + if (err) {
> > + dev_warn(dev, "Can't enable clock\n");
> > + return err;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > static void
> > mtk8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
> > {
> > @@ -130,19 +153,12 @@ mtk8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
> > static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
> > struct mtk8250_data *data)
> > {
> > - int err;
> > -
> > data->uart_clk = devm_clk_get(&pdev->dev, NULL);
> > if (IS_ERR(data->uart_clk)) {
> > dev_warn(&pdev->dev, "Can't get uart clock\n");
> > return PTR_ERR(data->uart_clk);
> > }
> >
> > - err = clk_prepare_enable(data->uart_clk);
> > - if (err) {
> > - dev_warn(&pdev->dev, "Can't prepare clock\n");
> > - return err;
> > - }
> > p->uartclk = clk_get_rate(data->uart_clk);
> >
> > return 0;
> > @@ -193,14 +209,18 @@ static int mtk8250_probe(struct platform_device *pdev)
> > writel(0x0, uart.port.membase +
> > (MTK_UART_RATE_FIX << uart.port.regshift));
> >
> > - data->line = serial8250_register_8250_port(&uart);
> > - if (data->line < 0)
> > - return data->line;
> > -
> > platform_set_drvdata(pdev, data);
> >
> > - pm_runtime_set_active(&pdev->dev);
> > pm_runtime_enable(&pdev->dev);
> > + if (!pm_runtime_enabled(&pdev->dev)) {
> > + err = mtk8250_runtime_resume(&pdev->dev);
> > + if (err)
> > + return err;
> > + }
> > +
> > + data->line = serial8250_register_8250_port(&uart);
> > + if (data->line < 0)
> > + return data->line;
>
> Why do you delete pm_runtime_set_active here?
pm_runtime_set_active() communicates the initial state of the device to
the pm core. Previously the driver activated the device manually by
directly calling clk_prepare_enable(). Since this manual enabling of
the clock is removed in this patch, the device is no longer active,
hence pm_runtime_set_active() has to be removed.
Sascha
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