On Tue, 18 Apr 2017, Puthikorn Voravootivat <puthik@xxxxxxxxxxxx> wrote:
> Some panel will default to zero brightness when turning the
> panel off and on again. This patch stores last brightness level
> before turning off and set them back when panel is turning on.
>
> Signed-off-by: Puthikorn Voravootivat <puthik@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> index ae1b6fe67feb..f99cf0a6ae44 100644
> --- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> @@ -95,6 +95,7 @@ intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level)
> DRM_DEBUG_KMS("Failed to write aux backlight level\n");
> return;
> }
> + connector->panel.backlight.level = level;
This gets already done in intel_panel_set_backlight(), and you shouldn't
touch it here.
> }
>
> /*
> @@ -150,6 +151,7 @@ static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
> drm_dp_dpcd_writeb(&intel_dp->aux,
> DP_EDP_BACKLIGHT_MODE_SET_REGISTER, new_dpcd_buf);
> }
> + intel_dp_aux_set_backlight(connector, connector->panel.backlight.level);
Seems like a sensible change.
BR,
Jani.
> }
>
> static void intel_dp_aux_disable_backlight(struct intel_connector *connector)
--
Jani Nikula, Intel Open Source Technology Center
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