drm/i915: Don't enable backlight at setup time.

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@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Yetunde Adebisi <yetundex.adebisi@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Puthikorn Voravootivat <puthik@chromium.org>
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@intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

1 files changed, 0 insertions, 10 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
index 6cc62980d0da..228ca06d9f0b 100644
--- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -80,10 +80,6 @@ static uint32_t intel_dp_aux_get_backlight(struct intel_connector *connector)
 static void
 intel_dp_aux_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 {
-        /*
-         * conn_state->best_encoder is likely NULL when called from
-         * intel_dp_aux_setup_backlight()
-         */
         struct intel_connector *connector = to_intel_connector(conn_state->connector);
         struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
         uint8_t vals[2] = { 0x0 };
@@ -106,10 +102,6 @@ static void intel_dp_aux_enable_backlight(const struct intel_crtc_state *crtc_st
                                           const struct drm_connector_state *conn_state)
 {
         struct intel_connector *connector = to_intel_connector(conn_state->connector);
-        /*
-         * conn_state->best_encoder (and crtc_state) are NULL when called from
-         * intel_dp_aux_setup_backlight()
-         */
         struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
         uint8_t dpcd_buf = 0;
         uint8_t edp_backlight_mode = 0;
@@ -156,8 +148,6 @@ 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(NULL, connector->base.state);
-
         if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
                 panel->backlight.max = 0xFFFF;
         else