Re: [PATCH v4] drm/i915: edp resume/On time optimization.

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On 1/20/2016 5:06 AM, Ville Syrjälä wrote:
On Wed, Jan 20, 2016 at 03:29:00PM +0530, Kumar, Shobhit wrote:
On 01/20/2016 02:30 PM, Daniel Vetter wrote:
On Tue, Jan 19, 2016 at 02:37:55PM -0800, Kumar, Abhay wrote:

On 1/12/2016 5:57 PM, Kumar, Abhay wrote:
From: Abhay Kumar <abhay.kumar@xxxxxxxxx>

Make resume/on codepath not to wait for panel_power_cycle_delay(t11_t12)
if this time is already spent in suspend/poweron time.

v2: Use CLOCK_BOOTTIME and remove jiffies for panel power cycle
      delay calculation(Ville).

v3: Addressed below comments
      1. Tracking time from where last powercycle is initiated.
      2. Used ktime_get_bootime() wrapper for boottime clock.
      3. Used ktime_ms_delta() to get time difference.

v4: Updated v3 change log in detail.

Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Abhay Kumar <abhay.kumar@xxxxxxxxx>
I can't see the r-b here nor anywhere else in this thread. That's why I
didn't pick it up. Where is it?
V3 of this patch was r-b by Ville and had comment on the commit msg. I updated commit msg and pushed V4.
So practically there is no code change and Ville r-b  should hold good.

Sorry in case i missed to keep that r-b by Ville in V3 here.

I didn't see it either. Ville can you please have a look at the latest
changes.
I don't think I'll bother since I'm pretty sure I already gave the r-b
during the last round. People really should learn to hang on to the r-bs
with some vigor.

Regards
Shobhit

-Daniel

---
   drivers/gpu/drm/i915/intel_dp.c  | 19 ++++++++++++++-----
   drivers/gpu/drm/i915/intel_drv.h |  2 +-
   2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 796e3d3..0042693 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1812,12 +1812,21 @@ static void wait_panel_off(struct intel_dp *intel_dp)
   static void wait_panel_power_cycle(struct intel_dp *intel_dp)
   {
+	static ktime_t panel_power_on_time;
+	s64 panel_power_off_duration;
+
   	DRM_DEBUG_KMS("Wait for panel power cycle\n");
+	/* take the difference of currrent time and panel power off time
+	 * and then make panel wait for t11_t12 if needed. */
+	panel_power_on_time = ktime_get_boottime();
+	panel_power_off_duration = ktime_ms_delta(panel_power_on_time, intel_dp->panel_power_off_time);
+
   	/* When we disable the VDD override bit last we have to do the manual
   	 * wait. */
-	wait_remaining_ms_from_jiffies(intel_dp->last_power_cycle,
-				       intel_dp->panel_power_cycle_delay);
+	if (panel_power_off_duration < (s64)intel_dp->panel_power_cycle_delay)
+		wait_remaining_ms_from_jiffies(jiffies,
+				       intel_dp->panel_power_cycle_delay - panel_power_off_duration);
   	wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
   }
@@ -1969,7 +1978,7 @@ static void edp_panel_vdd_off_sync(struct intel_dp *intel_dp)
   	I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
   	if ((pp & POWER_TARGET_ON) == 0)
-		intel_dp->last_power_cycle = jiffies;
+		intel_dp->panel_power_off_time = ktime_get_boottime();
   	power_domain = intel_display_port_aux_power_domain(intel_encoder);
   	intel_display_power_put(dev_priv, power_domain);
@@ -2118,7 +2127,7 @@ static void edp_panel_off(struct intel_dp *intel_dp)
   	I915_WRITE(pp_ctrl_reg, pp);
   	POSTING_READ(pp_ctrl_reg);
-	intel_dp->last_power_cycle = jiffies;
+	intel_dp->panel_power_off_time = ktime_get_boottime();
   	wait_panel_off(intel_dp);
   	/* We got a reference when we enabled the VDD. */
@@ -5122,7 +5131,7 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
   static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
   {
-	intel_dp->last_power_cycle = jiffies;
+	intel_dp->panel_power_off_time = ktime_get_boottime();
   	intel_dp->last_power_on = jiffies;
   	intel_dp->last_backlight_off = jiffies;
   }
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index bdfe403..06b37b8 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -793,9 +793,9 @@ struct intel_dp {
   	int backlight_off_delay;
   	struct delayed_work panel_vdd_work;
   	bool want_panel_vdd;
-	unsigned long last_power_cycle;
   	unsigned long last_power_on;
   	unsigned long last_backlight_off;
+	ktime_t panel_power_off_time;
   	struct notifier_block edp_notifier;
Since this is already reviewed. Can we please get this Queued for -next ?

Regards,
Abhay Kumar

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http://lists.freedesktop.org/mailman/listinfo/intel-gfx




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