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SubjectRe: [PATCHv4] serial: of-serial: fix up PM ops on no_console_suspend and port type
On 10/14/2014 04:42 PM, Jingchang Lu wrote:
> This patch fixes commit 2dea53bf57783f243c892e99c10c6921e956aa7e,
> "serial: of-serial: add PM suspend/resume support", which disables
> the uart clock on suspend, but also causes a hardware hang on register
> access if no_console_suspend command line option is used.
>
> Also, not every of_serial device is an 8250 port, so the serial8250
> suspend/resume functions should only be applied to a real 8250 port.
>
> Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com>

If you can make sure this patch can build without include
<linux/console.h>, then this patch

Tested-by: Joseph Lo <josephl@nvidia.com>

And thanks for your fix.

> ---
> changes in v4:
> separate 8250 port suspend/resume from of_serial_suspend/resume.
>
> changes in v3:
> fix up point reference and deference.
>
> changes in v2:
> add switch selection on uart type.
>
> drivers/tty/serial/of_serial.c | 52 ++++++++++++++++++++++++++++++++++++------
> 1 file changed, 45 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
> index 8bc2563..5281f8f 100644
> --- a/drivers/tty/serial/of_serial.c
> +++ b/drivers/tty/serial/of_serial.c
> @@ -241,13 +241,48 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
> }
>
> #ifdef CONFIG_PM_SLEEP
> -static int of_serial_suspend(struct device *dev)
> +#ifdef CONFIG_SERIAL_8250
> +static void of_serial_suspend_8250(struct of_serial_info *info)
> {
> - struct of_serial_info *info = dev_get_drvdata(dev);
> + struct uart_8250_port *port8250 = serial8250_get_port(info->line);
> + struct uart_port *port = &port8250->port;
>
> serial8250_suspend_port(info->line);
> - if (info->clk)
> + if (info->clk && (!uart_console(port) || console_suspend_enabled))
> clk_disable_unprepare(info->clk);
> +}
> +
> +static void of_serial_resume_8250(struct of_serial_info *info)
> +{
> + struct uart_8250_port *port8250 = serial8250_get_port(info->line);
> + struct uart_port *port = &port8250->port;
> +
> + if (info->clk && (!uart_console(port) || console_suspend_enabled))
> + clk_prepare_enable(info->clk);
> +
> + serial8250_resume_port(info->line);
> +}
> +#else
> +static inline void of_serial_suspend_8250(struct of_serial_info *info)
> +{
> +}
> +
> +static inline void of_serial_resume_8250(struct of_serial_info *info)
> +{
> +}
> +#endif
> +
> +static int of_serial_suspend(struct device *dev)
> +{
> + struct of_serial_info *info = dev_get_drvdata(dev);
> +
> + switch(info->type) {
> + case PORT_8250 ... PORT_MAX_8250:
> + of_serial_suspend_8250(info);
> + break;
> + default:
> + break;
> + }
>
> return 0;
> }
> @@ -256,10 +291,13 @@ static int of_serial_resume(struct device *dev)
> {
> struct of_serial_info *info = dev_get_drvdata(dev);
>
> - if (info->clk)
> - clk_prepare_enable(info->clk);
> -
> - serial8250_resume_port(info->line);
> + switch(info->type) {
> + case PORT_8250 ... PORT_MAX_8250:
> + of_serial_resume_8250(info);
> + break;
> + default:
> + break;
> + }
>
> return 0;
> }
>


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