drm/i915: Add lspcon resume function
As per the software design, we are driving lspcon in
PCON mode. But while resuming from suspend, lspcon can go
in LS mode (which is its default operating mode on power on)
This patch adds a resume function for lspcon, which makes sure
its operating in PCON mode, post resume.
V2: Address review comments from Imre
- move lspcon_resume call to encoder->reset()
- use early returns
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476455212-27893-6-git-send-email-shashank.sharma@intel.com
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 780691a..88f3b74 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4780,11 +4780,16 @@
void intel_dp_encoder_reset(struct drm_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(encoder->dev);
- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
+ struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
+ struct intel_dp *intel_dp = &intel_dig_port->dp;
if (!HAS_DDI(dev_priv))
intel_dp->DP = I915_READ(intel_dp->output_reg);
+ if (IS_GEN9(dev_priv) && lspcon->active)
+ lspcon_resume(lspcon);
+
if (to_intel_encoder(encoder)->type != INTEL_OUTPUT_EDP)
return;