[Intel-gfx] [PATCH] i915: Expose panel power cycle delay to i915_panel_timings

[Anshuamn Gupta]

On 2019-11-28 at 16:05:03 +0200, Jani Nikula wrote:
> On Mon, 18 Nov 2019, Anshuman Gupta <anshuman.gupta at intel.com> wrote:
> > Putting down the AUX power domain reference count in
> > edp vdd off async sequence takes too much of time
> > (relative to panel power cycle delay) therefore it make sense
> > to expose the panel power cycle delay to i915_panel_timings
> > along with other delays.
> > It can be use by DC state IGT to wait for strict power cycle delay
> > in order to check for various DC state counters.
> 
> Catching up on review, are you suggesting to look at this kind of
> debugfs files for tests? Please find another way.
Actually on few panels power cycle delay is too much that it is required 
to wait for 6 seconds in igt for an timeout, but this could really affect
CI execution time on panel with lesser power cycle delay.
(https://patchwork.freedesktop.org/series/68478/)
For this specific reason i thought it may be good to expose
panel power cycle delay with other panel delay and use that
in igt.
Thanks ,
Anshuman.
> 
> I don't mind having the debugfs info per se.
> 
> BR,
> Jani.
> 
> >
> > Cc: Imre Deak <imre.deak at intel.com>
> > Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_debugfs.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index cab632791f73..c075cc2b7bb5 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -4436,6 +4436,8 @@ static int i915_panel_show(struct seq_file *m, void *data)
> >  		   intel_dp->panel_power_up_delay);
> >  	seq_printf(m, "Panel power down delay: %d\n",
> >  		   intel_dp->panel_power_down_delay);
> > +	seq_printf(m, "Panel power cycle delay: %d\n",
> > +		   intel_dp->panel_power_cycle_delay);
> >  	seq_printf(m, "Backlight on delay: %d\n",
> >  		   intel_dp->backlight_on_delay);
> >  	seq_printf(m, "Backlight off delay: %d\n",
> 
> -- 
> Jani Nikula, Intel Open Source Graphics Center