linux-kernel - Re: [PATCHv2 6/8] serial: imx: add runtime pm support

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Message-ID: <CAOMZO5CCAd3_nYw2M1qPEevzJaymMi0oAn6FqGih3HbhvrYc9A@mail.gmail.com>
Date:	Tue, 11 Aug 2015 00:02:58 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Linux PM <linux-pm@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 6/8] serial: imx: add runtime pm support

On Mon, Aug 10, 2015 at 10:35 PM, Eduardo Valentin <edubezval@...il.com> wrote:

>  static int imx_poll_get_char(struct uart_port *port)
>  {
> -       if (!(readl_relaxed(port->membase + USR2) & USR2_RDR))
> -               return NO_POLL_CHAR;
> +       int ret;
> +
> +       pm_runtime_get_sync(sport->dev);
> +       if (!(readl_relaxed(port->membase + USR2) & USR2_RDR)) {
> +               ret = NO_POLL_CHAR;
> +               goto mark_last;
> +       }
>
> -       return readl_relaxed(port->membase + URXD0) & URXD_RX_DATA;
> +       ret = readl_relaxed(port->membase + URXD0) & URXD_RX_DATA;
> +
> +mark_last:
> +       pm_runtime_mark_last_busy(sport->dev);
> +       pm_runtime_put_autosuspend(sport->dev);

You should return ret here.

> +static int serial_imx_runtime_resume(struct device *dev)
> +{
> +       struct imx_port *sport = dev_get_drvdata(dev);
> +
> +       clk_enable(sport->clk_per);

clk_enable() may fail.

> +       clk_enable(sport->clk_ipg);

Same here.

> @@ -2096,6 +2212,8 @@ static int imx_serial_port_resume(struct device *dev)
>         struct platform_device *pdev = to_platform_device(dev);
>         struct imx_port *sport = platform_get_drvdata(pdev);
>
> +       clk_prepare_enable(sport->clk_per);

clk_prepare_enable() may fail.

> +       clk_prepare_enable(sport->clk_ipg);

Ditto.
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