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Subject[PATCH 19/21] drm/i915: Asynchronous eDP panel power off
Date
Using the same basic plan as the VDD force delayed power off, make
turning the panel power off asynchronous.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
drivers/gpu/drm/i915/intel_dp.c | 71 +++++++++++++++++++++++++++++----------
1 files changed, 53 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 08817b0..7120ba7 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -62,8 +62,9 @@ struct intel_dp {
int panel_power_up_delay;
int panel_power_down_delay;
struct drm_display_mode *panel_fixed_mode; /* for eDP */
- struct delayed_work panel_vdd_work;
+ struct delayed_work panel_work;
bool want_panel_vdd;
+ bool want_panel_power;
unsigned long panel_off_jiffies;
};

@@ -906,7 +907,9 @@ static void ironlake_edp_panel_vdd_on(struct intel_dp *intel_dp)
}
}

-static void ironlake_panel_vdd_off_sync(struct intel_dp *intel_dp)
+static void ironlake_edp_panel_off_sync(struct intel_dp *intel_dp);
+
+static void ironlake_edp_panel_vdd_off_sync(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -927,14 +930,15 @@ static void ironlake_panel_vdd_off_sync(struct intel_dp *intel_dp)
}
}

-static void ironlake_panel_vdd_work(struct work_struct *__work)
+static void ironlake_panel_work(struct work_struct *__work)
{
struct intel_dp *intel_dp = container_of(to_delayed_work(__work),
- struct intel_dp, panel_vdd_work);
+ struct intel_dp, panel_work);
struct drm_device *dev = intel_dp->base.base.dev;

mutex_lock(&dev->struct_mutex);
- ironlake_panel_vdd_off_sync(intel_dp);
+ ironlake_edp_panel_vdd_off_sync(intel_dp);
+ ironlake_edp_panel_off_sync(intel_dp);
mutex_unlock(&dev->struct_mutex);
}

@@ -943,20 +947,20 @@ static void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
if (!is_edp(intel_dp))
return;

- DRM_DEBUG_KMS("Turn eDP VDD off %d\n", intel_dp->want_panel_vdd);
+ DRM_DEBUG_KMS("Turn eDP VDD off %d\n", sync);
WARN(!intel_dp->want_panel_vdd, "eDP VDD not forced on");

intel_dp->want_panel_vdd = false;

if (sync) {
- ironlake_panel_vdd_off_sync(intel_dp);
+ ironlake_edp_panel_vdd_off_sync(intel_dp);
} else {
/*
* Queue the timer to fire a long
* time from now (relative to the power down delay)
* to keep the panel power up across a sequence of operations
*/
- schedule_delayed_work(&intel_dp->panel_vdd_work,
+ schedule_delayed_work(&intel_dp->panel_work,
msecs_to_jiffies(intel_dp->panel_power_down_delay * 5));
}
}
@@ -968,10 +972,16 @@ static void ironlake_edp_panel_on (struct intel_dp *intel_dp)
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp, idle_on_mask = PP_ON | PP_SEQUENCE_STATE_ON_IDLE;

- if (ironlake_edp_have_panel_power(intel_dp))
+ DRM_DEBUG_KMS("Turn eDP panel on\n");
+ if (ironlake_edp_have_panel_power(intel_dp)) {
+ DRM_DEBUG_KMS("eDP panel already on\n");
return;
+ }

ironlake_wait_panel_off(intel_dp);
+
+ intel_dp->want_panel_power = true;
+
pp = I915_READ(PCH_PP_CONTROL);
pp &= ~PANEL_UNLOCK_MASK;
pp |= PANEL_UNLOCK_REGS;
@@ -995,14 +1005,16 @@ static void ironlake_edp_panel_on (struct intel_dp *intel_dp)
POSTING_READ(PCH_PP_CONTROL);
}

-static void ironlake_edp_panel_off(struct drm_encoder *encoder)
+static void ironlake_edp_panel_off_sync(struct intel_dp *intel_dp)
{
- struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
- struct drm_device *dev = encoder->dev;
+ struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp, idle_off_mask = PP_ON | PP_SEQUENCE_MASK |
PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK;

+ if (intel_dp->want_panel_power || !ironlake_edp_have_panel_power(intel_dp))
+ return;
+
pp = I915_READ(PCH_PP_CONTROL);
pp &= ~PANEL_UNLOCK_MASK;
pp |= PANEL_UNLOCK_REGS;
@@ -1026,6 +1038,28 @@ static void ironlake_edp_panel_off(struct drm_encoder *encoder)
intel_dp->panel_off_jiffies = jiffies;
}

+static void ironlake_edp_panel_off(struct drm_encoder *encoder, bool sync)
+{
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+ DRM_DEBUG_KMS("Turn eDP panel off %d\n", sync);
+
+ intel_dp->want_panel_power = false;
+
+ if (sync)
+ ironlake_edp_panel_off_sync(intel_dp);
+ else {
+ /*
+ * Queue the timer to fire a long
+ * time from now (relative to the power down delay)
+ * to keep the panel power up across a sequence of operations
+ */
+ schedule_delayed_work(&intel_dp->panel_work,
+ msecs_to_jiffies(intel_dp->panel_power_down_delay * 5));
+ }
+
+}
+
static void ironlake_edp_backlight_on (struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1121,7 +1155,7 @@ static void intel_dp_prepare(struct drm_encoder *encoder)

if (is_edp(intel_dp)) {
ironlake_edp_backlight_off(dev);
- ironlake_edp_panel_off(encoder);
+ ironlake_edp_panel_off(encoder, false);
if (!is_pch_edp(intel_dp))
ironlake_edp_pll_on(encoder);
else
@@ -1165,7 +1199,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
intel_dp_sink_dpms(intel_dp, mode);
intel_dp_link_down(intel_dp);
if (is_edp(intel_dp))
- ironlake_edp_panel_off(encoder);
+ ironlake_edp_panel_off(encoder, true);
if (is_edp(intel_dp) && !is_pch_edp(intel_dp))
ironlake_edp_pll_off(encoder);
} else {
@@ -2016,8 +2050,9 @@ static void intel_dp_encoder_destroy(struct drm_encoder *encoder)
i2c_del_adapter(&intel_dp->adapter);
drm_encoder_cleanup(encoder);
if (is_edp(intel_dp)) {
- cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
- ironlake_panel_vdd_off_sync(intel_dp);
+ cancel_delayed_work_sync(&intel_dp->panel_work);
+ ironlake_edp_panel_vdd_off_sync(intel_dp);
+ ironlake_edp_panel_off_sync(intel_dp);
}
kfree(intel_dp);
}
@@ -2157,8 +2192,8 @@ intel_dp_init(struct drm_device *dev, int output_reg)

if (is_edp(intel_dp)) {
intel_encoder->clone_mask = (1 << INTEL_EDP_CLONE_BIT);
- INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
- ironlake_panel_vdd_work);
+ INIT_DELAYED_WORK(&intel_dp->panel_work,
+ ironlake_panel_work);
}

intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
--
1.7.6.3


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