Let's clear a bit the difference between enable_source and activate
and explain it on comments and docs.
After that we will be able to introduce inactivate/activate VLV+
functions
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 34 +++++++++++++++++++++++++++++++---
1 file changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 335a711..813537a 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2197,6 +2197,14 @@ static void vlv_edp_psr_enable_sink(struct intel_dp
*intel_dp)
DP_PSR_ENABLE);
}
+/**
+ * hsw_edp_psr_enable_sink - Enable PSR on Panel for HSW+.
+ * @intel_dp: DP struct
+ *
+ * This function enable PSR on Panel (Sink) side.
+ * On HSW+ platform when enabling PSR on Panel we need also to setup aux
+ * registers.
+ */
static void hsw_edp_psr_enable_sink(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
@@ -2262,6 +2270,16 @@ static void vlv_edp_psr_enable_source(struct intel_dp
*intel_dp)
VLV_EDP_PSR_ENABLE);
}
+/**
+ * hsw_edp_psr_enable_source - Enable PSR on Source.
+ * @intel_dp: DP struct
+ *
+ * This function enable PSR on Platform (Source) side.
+ * On HSW+ platform when enabling PSR on Source it also allow Hardware to
+ * immediately transitioning to PSR Entry/Active state as soon as it matches
+ * configure idle_frame count. So this function might be called only when
+ * we really can go to activate state.
+ */
static void hsw_edp_psr_enable_source(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
@@ -2336,7 +2354,13 @@ static bool intel_edp_psr_match_conditions(struct
intel_dp *intel_dp)
return true;
}
-static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
+/**
+ * intel_edp_psr_activate - Activate PSR
+ * @intel_dp: DP struct
+ *
+ * This function allows PSR to go to Entry/Active state as soon as possible.
+ */
+static void intel_edp_psr_activate(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
@@ -2346,7 +2370,11 @@ static void intel_edp_psr_do_enable(struct intel_dp
*intel_dp)
WARN_ON(dev_priv->psr.active);
lockdep_assert_held(&dev_priv->psr.lock);
- /* Enable/Re-enable PSR on the host */
+ /* Enable/Re-enable PSR on the host
+ * On HSW/BDW after we enable PSR on source it will activate it
+ * as soon as it match configure idle_frame count. So
+ * we just actually enable it here on activation time.
+ */
hsw_edp_psr_enable_source(intel_dp);
dev_priv->psr.active = true;
@@ -2512,7 +2540,7 @@ static void intel_edp_psr_work(struct work_struct *work)
if (dev_priv->psr.busy_frontbuffer_bits)
goto unlock;
- intel_edp_psr_do_enable(intel_dp);
+ intel_edp_psr_activate(intel_dp);
unlock:
mutex_unlock(&dev_priv->psr.lock);
}
--
1.9.3
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