On Mon, 2017-06-19 at 11:08 -0700, Dhinakaran Pandiyan wrote:
> Maarten and Ville noticed that we are enabling backlight via DP aux very
> early in the modeset_init path via the intel_dp_aux_setup_backlight()
> function, since commit e7156c833903 ("drm/i915: Add Backlight Control using
> DPCD for eDP connectors (v9)"). Looks like all we need to do during
> _setup_backlight() is read the current brightness state instead of
> modifying it.
>
> v2: Rewrote commit message.
>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Yetunde Adebisi <yetundex.adebisi@xxxxxxxxx>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> Tested-by: Puthikorn Voravootivat <puthik@xxxxxxxxxxxx>
> Fixes: e7156c833903 ("drm/i915: Add Backlight Control using DPCD for eDP connectors (v9)")
> Link: http://patchwork.freedesktop.org/patch/msgid/1497384239-2965-1-git-send-email-dhinakaran.pandiyan@xxxxxxxxx
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> (cherry picked from commit f6262bda462e81e959b80a96dac799bd9df27f73)
I am sending a backport for the first time, please let me know if I
messed up something.
> ---
> drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> index 6532e22..40ba313 100644
> --- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
> @@ -119,8 +119,6 @@ static int intel_dp_aux_setup_backlight(struct intel_connector *connector,
> struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
> struct intel_panel *panel = &connector->panel;
>
> - intel_dp_aux_enable_backlight(connector);
> -
> if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
> panel->backlight.max = 0xFFFF;
> else
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