linux-kernel - Re: [PATCH] serial: sh-sci: Call device_set_wakeup

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Date: Tue, 23 Apr 2024 17:05:27 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: claudiu beznea <claudiu.beznea@...on.dev>
Cc: gregkh@...uxfoundation.org, jirislaby@...nel.org, ulf.hansson@...aro.org, 
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, 
	linux-pm@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] serial: sh-sci: Call device_set_wakeup_path() for serial console

Hi Claudiu,

On Tue, Apr 23, 2024 at 2:47 PM claudiu beznea <claudiu.beznea@...on.dev> wrote:
> On 23.04.2024 10:27, Geert Uytterhoeven wrote:
> > On Mon, Apr 22, 2024 at 1:11 PM Claudiu <claudiu.beznea@...on.dev> wrote:
> >> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> >>
> >> In case the SCI is used as a UART console, no_console_suspend is
> >> available in bootargs and SCI is part of a software-controlled power
> >> domain we need to call device_set_wakeup_path(). This lets the power
> >> domain core code knows that this domain should not be powered off
> >
> > know
> >
> >> durring system suspend. Otherwise, the SCI power domain is turned off,
> >
> > during
> >
> >> nothing is printed while suspending and the suspend/resume process is
> >> blocked. This was detected on the RZ/G3S SoC while adding support
> >> for power domains.
> >>
> >> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

> > If this works, we can remove the console_suspend_enabled handling
> > from drivers/pmdomain/renesas/rmobile-sysc.c, and revert commit
> > 309864dcf92b76fc ("genpd: imx: scu-pd: do not power off console if
> > no_console_suspend").
>
> OK, first I'll go with this patch and after things settles down with it
> I'll propose changes for rmobile-sysc and imx. Is this ok for you?

I have already made these changes to rmobile-sysc locally to test
your patch ;-)

It works fine on R-Mobile APE6, so
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds