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drm/radeon: restore backlight level on resume 

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;