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| author | Hans de Goede <hdegoede@redhat.com> | 2022-09-17 23:59:16 +0300 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2022-09-18 22:02:52 +0300 |
| commit | 1f90b1232773249d924868bec3c31525a69fd482 (patch) | |
| tree | f2c7334b7ade8e2e8f89d29c6a63d5b58ae0ee69 /drivers/gpu/drm/gma500/opregion.c | |
| parent | e10ea7b9b90219da305a16b3c1252169715a807b (diff) | |
| download | linux-1f90b1232773249d924868bec3c31525a69fd482.tar.xz | |
drm/gma500: Refactor backlight support (v2)
Refactor backlight support so that the gma_backlight_enable() /
gma_backlight_disable() / gma_backlight_set() functions used by
the Opregion handle will also work if no backlight_device gets
registered.
This is a preparation patch for not registering the gma500's own backlight
device when acpi_video should be used, since registering 2 backlight
devices for a single display really is undesirable.
Since the acpi-video interface often uses the OpRegion we need to keep
the OpRegion functional even when dev_priv->backlight_device is NULL.
As a result of this refactor the actual backlight_device_register()
call is moved to the shared backlight.c code and all #ifdefs related to
CONFIG_BACKLIGHT_CLASS_DEVICE are now also limited to backlight.c .
No functional changes intended.
This has been tested on a Packard Bell Dot SC (Intel Atom N2600, cedarview)
and a Sony Vaio vpc-x11s1e (Intel N540, poulsbo) laptop.
Changes in v2:
- Fix unused variable warnings when CONFIG_BACKLIGHT is not selected by
marking the 2 variables as __maybe_unused.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220917205920.647212-2-hdegoede@redhat.com
Diffstat (limited to 'drivers/gpu/drm/gma500/opregion.c')
| -rw-r--r-- | drivers/gpu/drm/gma500/opregion.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/gpu/drm/gma500/opregion.c b/drivers/gpu/drm/gma500/opregion.c index dc494df71a48..0c271072af63 100644 --- a/drivers/gpu/drm/gma500/opregion.c +++ b/drivers/gpu/drm/gma500/opregion.c @@ -150,21 +150,17 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); struct opregion_asle *asle = dev_priv->opregion.asle; - struct backlight_device *bd = dev_priv->backlight_device; DRM_DEBUG_DRIVER("asle set backlight %x\n", bclp); if (!(bclp & ASLE_BCLP_VALID)) return ASLE_BACKLIGHT_FAILED; - if (bd == NULL) - return ASLE_BACKLIGHT_FAILED; - bclp &= ASLE_BCLP_MSK; if (bclp > 255) return ASLE_BACKLIGHT_FAILED; - gma_backlight_set(dev, bclp * bd->props.max_brightness / 255); + gma_backlight_set(dev, bclp * PSB_MAX_BRIGHTNESS / 255); asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID; |