linux-kernel - Re: [PATCH v5 3/3] drm/privacy_screen_x86: Add entry for ChromeOS privacy-screen

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Date:   Sat, 8 Jan 2022 09:21:38 -0800
From:   Rajat Jain <rajatja@...gle.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Benson Leung <bleung@...gle.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Benson Leung <bleung@...omium.org>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Mark Gross <markgross@...nel.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, gwendal@...gle.com,
        seanpaul@...gle.com, marcheu@...gle.com, dtor@...gle.com,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        rajatxjain@...il.com
Subject: Re: [PATCH v5 3/3] drm/privacy_screen_x86: Add entry for ChromeOS privacy-screen

On Sat, Jan 8, 2022 at 8:10 AM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi All,
>
> On 1/7/22 20:06, Benson Leung wrote:
> > Hi Rajat,
> >
> > Thanks for your changes here.
> >
> > On Fri, Jan 07, 2022 at 11:02:08AM -0800, Rajat Jain wrote:
> >> Add a static entry in the x86 table, to detect and wait for
> >> privacy-screen on some ChromeOS platforms.
> >>
> >> Please note that this means that if CONFIG_CHROMEOS_PRIVACY_SCREEN is
> >> enabled, and if "GOOG0010" device is found in ACPI, then the i915 probe
> >> shall return EPROBE_DEFER until a platform driver actually registers the
> >> privacy-screen: https://hansdegoede.livejournal.com/25948.html
> >>
> >> Signed-off-by: Rajat Jain <rajatja@...gle.com>
> >> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> >
> > Hi Hans,
> >
> > Since this change depends on the privacy screen changes staged for v5.17,
> > I'm OK as platform/chrome maintainer to have this go through the drm tree.
> >
> > Acked-By: Benson Leung <bleung@...omium.org>
>
> Ok, I will merge this into drm-misc-next coming Monday.

Thank you so much for your help!

>
> Note I'm afraid that it is too late for 5.17, the drm-misc maintainers
> have already created the final drm-misc tag for the 5.17 pull-req.

No problem, this works.

Thanks & Best Regards,

Rajat

>
> Regards,
>
> Hans
>
>
> >
> >
> >> ---
> >> v5: * Add Hans' "Reviewed by"
> >> v4: * Simplify the detect_chromeos_privacy_screen() function
> >>     * Don't change the existing print statement
> >> v3: * Remove the pr_info() from detect_chromeos_privacy_screen(), instead
> >>       enhance the one already present in drm_privacy_screen_lookup_init()
> >> v2: * Use #if instead of #elif
> >>     * Reorder the patches in the series.
> >>     * Rebased on drm-tip
> >>
> >>  drivers/gpu/drm/drm_privacy_screen_x86.c | 17 +++++++++++++++++
> >>  1 file changed, 17 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/drm_privacy_screen_x86.c b/drivers/gpu/drm/drm_privacy_screen_x86.c
> >> index a2cafb294ca6..88802cd7a1ee 100644
> >> --- a/drivers/gpu/drm/drm_privacy_screen_x86.c
> >> +++ b/drivers/gpu/drm/drm_privacy_screen_x86.c
> >> @@ -47,6 +47,13 @@ static bool __init detect_thinkpad_privacy_screen(void)
> >>  }
> >>  #endif
> >>
> >> +#if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN)
> >> +static bool __init detect_chromeos_privacy_screen(void)
> >> +{
> >> +    return acpi_dev_present("GOOG0010", NULL, -1);
> >> +}
> >> +#endif
> >> +
> >>  static const struct arch_init_data arch_init_data[] __initconst = {
> >>  #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
> >>      {
> >> @@ -58,6 +65,16 @@ static const struct arch_init_data arch_init_data[] __initconst = {
> >>              .detect = detect_thinkpad_privacy_screen,
> >>      },
> >>  #endif
> >> +#if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN)
> >> +    {
> >> +            .lookup = {
> >> +                    .dev_id = NULL,
> >> +                    .con_id = NULL,
> >> +                    .provider = "privacy_screen-GOOG0010:00",
> >> +            },
> >> +            .detect = detect_chromeos_privacy_screen,
> >> +    },
> >> +#endif
> >>  };
> >>
> >>  void __init drm_privacy_screen_lookup_init(void)
> >> --
> >> 2.34.1.575.g55b058a8bb-goog
> >>
> >
>