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.
V4:
- Use sanitized panel backlight controller instead of vbt backlight
controller
Signed-off-by: Mustamin B Mustaffa <mustamin.b.mustaffa@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1868f73..f9b922d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -655,18 +655,15 @@ static enum pipe vlv_find_free_pps(struct drm_i915_private *dev_priv)
{
struct drm_i915_private *dev_priv = to_i915(intel_dp_to_dev(intel_dp));
+ int backlight_controller = intel_dp->attached_connector->panel.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 +673,7 @@ static enum pipe vlv_find_free_pps(struct drm_i915_private *dev_priv)
*/
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,
--
1.9.1
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