[Intel-gfx] [PATCH v4] drm/i915: edp resume/On time optimization.

[Ville Syrjälä]

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 at intel.com>
> >>>
> >>> 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 at linux.intel.com>
> >>> Signed-off-by: Abhay Kumar <abhay.kumar at intel.com>
> >
> > 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?
> 
> 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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-- 
Ville Syrjälä
Intel OTC