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ACPI: video: Improve Chromebook checks

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2 improvements for the Chromebook handling in
acpi_video_get_backlight_type():

1. Also check for the "GOOG000C" ACPI HID used on some models
2. Move the Chromebook check to above the ACPI-video check normally
   Chromebooks don't have ACPI video backlight support, but when
   flashed with upstream coreboot builds they may have ACPI video
   backlight support, but native should still be used/preferred then.

Suggested-by: Mr. Chromebox <mrchromebox@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2022-10-31 11:17:45 +01:00
parent e9cf4d9b9a
commit 59dc2a7e7c
1 changed files with 5 additions and 8 deletions
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13
drivers/acpi/video_detect.c
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@ -670,7 +670,7 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
static bool google_cros_ec_present(void)
{
return acpi_dev_found("GOOG0004");
return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
}
/*
@ -718,6 +718,10 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
if (apple_gmux_present())
return acpi_backlight_apple_gmux;
/* Chromebooks should always prefer native backlight control. */
if (google_cros_ec_present() && native_available)
return acpi_backlight_native;
/* On systems with ACPI video use either native or ACPI video. */
if (video_caps & ACPI_VIDEO_BACKLIGHT) {
/*
@ -735,13 +739,6 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
return acpi_backlight_video;
}
/*
* Chromebooks that don't have backlight handle in ACPI table
* are supposed to use native backlight if it's available.
*/
if (google_cros_ec_present() && native_available)
return acpi_backlight_native;
/* No ACPI video (old hw), use vendor specific fw methods. */
return acpi_backlight_vendor;
}