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

From: Hans de Goede
Date: Sat Jan 08 2022 - 11:10:19 EST


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@xxxxxxxxxx>
>> Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
>
> 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@xxxxxxxxxxxx>

Ok, I will merge this into drm-misc-next coming Monday.

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.

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
>>
>