[PATCH] drm/radeon: Restore LCD backlight level on resume (>= R5xx)

[Alex Deucher]

On Mon, Sep 28, 2015 at 5:16 AM, Michel Dänzer <michel at daenzer.net> wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Instead of only enabling the backlight (which seems to set it to max
> brightness), just re-set the current backlight level, which also takes
> care of enabling the backlight if necessary.
>
> Only the radeon_atom_encoder_dpms_dig part tested on a Kaveri laptop,
> the radeon_atom_encoder_dpms_avivo part is only compile tested.
>
> Cc: stable at vger.kernel.org
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

Applied and committed a similar fix for amdgpu.

Thanks!

Alex

> ---
>  drivers/gpu/drm/radeon/atombios_encoders.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
> index c387259..65adb9c 100644
> --- a/drivers/gpu/drm/radeon/atombios_encoders.c
> +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
> @@ -1624,8 +1624,9 @@ radeon_atom_encoder_dpms_avivo(struct drm_encoder *encoder, int mode)
>                 } else
>                         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
>                 if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
> -                       args.ucAction = ATOM_LCD_BLON;
> -                       atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
> +                       struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
> +
> +                       atombios_set_backlight_level(radeon_encoder, dig->backlight_level);
>                 }
>                 break;
>         case DRM_MODE_DPMS_STANDBY:
> @@ -1706,8 +1707,7 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
>                                 atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0);
>                 }
>                 if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT))
> -                       atombios_dig_transmitter_setup(encoder,
> -                                                      ATOM_TRANSMITTER_ACTION_LCD_BLON, 0, 0);
> +                       atombios_set_backlight_level(radeon_encoder, dig->backlight_level);
>                 if (ext_encoder)
>                         atombios_external_encoder_setup(encoder, ext_encoder, ATOM_ENABLE);
>                 break;
> --
> 2.5.0
>
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