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drm/i915: Enable VBT based BL control for DP 

Currently, BXT_PP is hardcoded with value '0'.
It practically disabled eDP backlight on MRB (BXT) platform.

This patch will tell which BXT_PP registers (there are two set of
PP_CONTROL in the spec) to be used as defined in VBT (Video Bios Timing
table) and this will enabled eDP backlight controller on MRB (BXT)
platform.

v2:
 - Remove unnecessary information in commit message.
 - Assign vbt.backlight.controller to a backlight_controller variable and
   return the variable value.
v3:
 - Rebased to latest code base.
 - updated commit title.

Signed-off-by: Mustamin B Mustaffa <mustamin.b.mustaffa@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180227030734.37901-1-mustamin.b.mustaffa@intel.com
This commit is contained in:
Mustamin B Mustaffa 2018-02-27 11:07:34 +08:00 committed by Jani Nikula
parent 128326a10c
commit 73c0fcac97
1 changed files with 3 additions and 7 deletions
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10
drivers/gpu/drm/i915/intel_dp.c
View File

@ -654,19 +654,15 @@ static int
bxt_power_sequencer_idx(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
int backlight_controller = dev_priv->vbt.backlight.controller;
lockdep_assert_held(&dev_priv->pps_mutex);
/* We should never land here with regular DP ports */
WARN_ON(!intel_dp_is_edp(intel_dp));
/*
* TODO: BXT has 2 PPS instances. The correct port->PPS instance
* mapping needs to be retrieved from VBT, for now just hard-code to
* use instance #0 always.
*/
if (!intel_dp->pps_reset)
return 0;
return backlight_controller;
intel_dp->pps_reset = false;
@ -676,7 +672,7 @@ bxt_power_sequencer_idx(struct intel_dp *intel_dp)
*/
intel_dp_init_panel_power_sequencer_registers(intel_dp, false);
return 0;
return backlight_controller;
}
typedef bool (*vlv_pipe_check)(struct drm_i915_private *dev_priv,