Messages in this thread Patch in this message | | | Date | Mon, 13 Oct 2014 08:01:06 -0400 | From | Peter Hurley <> | Subject | Re: [PATCHv3] serial: of-serial: fix up PM ops on no_console_suspend and port type |
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On 10/13/2014 05:14 AM, 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> > --- > changes in v3: > fix up point reference and deference. > > changes in v2: > add switch selection on uart type. > > drivers/tty/serial/of_serial.c | 42 ++++++++++++++++++++++++++++++++++++------ > 1 file changed, 36 insertions(+), 6 deletions(-) > > diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c > index 8bc2563..9d747a7 100644 > --- a/drivers/tty/serial/of_serial.c > +++ b/drivers/tty/serial/of_serial.c > @@ -245,9 +245,24 @@ static int of_serial_suspend(struct device *dev) > { > struct of_serial_info *info = dev_get_drvdata(dev); > > - serial8250_suspend_port(info->line); > - if (info->clk) > - clk_disable_unprepare(info->clk); > + switch(info->type) { > +#ifdef CONFIG_SERIAL_8250 > + case PORT_8250 ... PORT_MAX_8250: > + { > + struct uart_8250_port *port8250; > + port8250 = serial8250_get_port(info->line); > + > + serial8250_suspend_port(info->line); > + if (info->clk && > + (!uart_console(&port8250->port) || > + (uart_console(&port8250->port) && console_suspend_enabled)))
This conditional is the same as
if (info->clk && (!uart_console(&port8250->port) || console_suspend_enabled))
> + clk_disable_unprepare(info->clk); > + break; > + } > +#endif > + default: > + break; > + }
I suggest you separate this into a separate function like:
#ifdef CONFIG_SERIAL_8250 static void of_serial_suspend_8250(struct of_serial_info *info) { struct uart_8250_port *uart = serial_8250_get_port(info->line); struct uart_port *port = &uart->port;
serial8250_suspend_port(info->line); if (info->clk && (!uart_console(port) || console_suspend_enabled)) clk_disable_unprepare(info->clk); } #else static inline void of_serial_suspend_8250(struct of_serial_info *info) { } #endif
and call it like:
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; }
return 0; }
I did not build-test this, so you should.
Regards, Peter Hurley
> > return 0; > } > @@ -256,10 +271,25 @@ 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); > + switch(info->type) { > +#ifdef CONFIG_SERIAL_8250 > + case PORT_8250 ... PORT_MAX_8250: > + { > + struct uart_8250_port *port8250; > + port8250 = serial8250_get_port(info->line); > + > + if (info->clk && > + (!uart_console(&port8250->port) || > + (uart_console(&port8250->port) && console_suspend_enabled))) > + clk_prepare_enable(info->clk); > > - serial8250_resume_port(info->line); > + serial8250_resume_port(info->line); > + break; > + } > +#endif > + default: > + break; > + } > > return 0; > } >
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