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drm/radeon: restore backlight level on resume

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Restore the backlight level on resume.  Some systems
need to explicitly restore the backlight level on
resume.

Fixes panel resume on my Trinity laptop and may fix the
following bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=43829
https://bugzilla.kernel.org/show_bug.cgi?id=46241

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2012-09-14 09:45:50 -04:00
parent 6d92f81dcf
commit bced76f271
4 changed files with 14 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/gpu/drm/radeon/atombios_encoders.c
View file

@ -32,8 +32,6 @@
extern int atom_debug;
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
static u8
radeon_atom_get_backlight_level_from_reg(struct radeon_device *rdev)
{
@ -134,6 +132,8 @@ atombios_set_backlight_level(struct radeon_encoder *radeon_encoder, u8 level)
}
}
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
static u8 radeon_atom_bl_level(struct backlight_device *bd)
{
u8 level;

7
drivers/gpu/drm/radeon/radeon_device.c
View file

@ -1282,6 +1282,13 @@ int radeon_resume_kms(struct drm_device *dev)
if (rdev->is_atom_bios) {
radeon_atom_encoder_init(rdev);
radeon_atom_disp_eng_pll_init(rdev);
/* turn on the BL */
if (rdev->mode_info.bl_encoder) {
u8 bl_level = radeon_get_backlight_level(rdev,
rdev->mode_info.bl_encoder);
radeon_set_backlight_level(rdev, rdev->mode_info.bl_encoder,
bl_level);
}
}
/* reset hpd state */
radeon_hpd_init(rdev);

1
drivers/gpu/drm/radeon/radeon_encoders.c
View file

@ -179,6 +179,7 @@ radeon_link_encoder_connector(struct drm_device *dev)
radeon_atom_backlight_init(radeon_encoder, connector);
else
radeon_legacy_backlight_init(radeon_encoder, connector);
rdev->mode_info.bl_encoder = radeon_encoder;
}
}
}

6
drivers/gpu/drm/radeon/radeon_mode.h
View file

@ -254,12 +254,14 @@ struct radeon_mode_info {
struct radeon_fbdev *rfbdev;
/* firmware flags */
u16 firmware_flags;
/* pointer to backlight encoder */
struct radeon_encoder *bl_encoder;
};
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
#define RADEON_MAX_BL_LEVEL 0xFF
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
struct radeon_backlight_privdata {
struct radeon_encoder *encoder;
uint8_t negative;