Re: [Intel-gfx] [PATCH v4 05/18] drm/i915: Extract intel_crtc_scanlines_since_frame_timestamp()

["Navare, Manasi" <manasi.d.navare@intel.com>]

On Thu, Jan 21, 2021 at 02:52:11PM -0800, Navare, Manasi wrote:
> On Wed, Jan 13, 2021 at 02:09:22PM -0800, Manasi Navare wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > Extract intel_crtc_scanlines_since_frame_timestamp() from
> > __intel_get_crtc_scanline_from_timestamp(). We'll reuse this
> > for VRR vblank timestamps.
> 
> I dont see the intel_crtc_scanlines_since_frame_timestamp() getting used
> later in the series.
> Should this be moved to the intel display poller rest of the patches you might have?
> 
> Manasi

Oh actually I did find where its being used to calculate the vblank timestamps

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>

Manasi

> 
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_irq.c | 38 +++++++++++++++++++++------------
> >  1 file changed, 24 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> > index dd1971040bbc..8505ceca87d5 100644
> > --- a/drivers/gpu/drm/i915/i915_irq.c
> > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > @@ -718,25 +718,15 @@ u32 g4x_get_vblank_counter(struct drm_crtc *crtc)
> >  	return intel_uncore_read(&dev_priv->uncore, PIPE_FRMCOUNT_G4X(pipe));
> >  }
> >  
> > -/*
> > - * On certain encoders on certain platforms, pipe
> > - * scanline register will not work to get the scanline,
> > - * since the timings are driven from the PORT or issues
> > - * with scanline register updates.
> > - * This function will use Framestamp and current
> > - * timestamp registers to calculate the scanline.
> > - */
> > -static u32 __intel_get_crtc_scanline_from_timestamp(struct intel_crtc *crtc)
> > +static u32 intel_crtc_scanlines_since_frame_timestamp(struct intel_crtc *crtc)
> >  {
> >  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> >  	struct drm_vblank_crtc *vblank =
> >  		&crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
> >  	const struct drm_display_mode *mode = &vblank->hwmode;
> > -	u32 vblank_start = mode->crtc_vblank_start;
> > -	u32 vtotal = mode->crtc_vtotal;
> >  	u32 htotal = mode->crtc_htotal;
> >  	u32 clock = mode->crtc_clock;
> > -	u32 scanline, scan_prev_time, scan_curr_time, scan_post_time;
> > +	u32 scan_prev_time, scan_curr_time, scan_post_time;
> >  
> >  	/*
> >  	 * To avoid the race condition where we might cross into the
> > @@ -763,8 +753,28 @@ static u32 __intel_get_crtc_scanline_from_timestamp(struct intel_crtc *crtc)
> >  						  PIPE_FRMTMSTMP(crtc->pipe));
> >  	} while (scan_post_time != scan_prev_time);
> >  
> > -	scanline = div_u64(mul_u32_u32(scan_curr_time - scan_prev_time,
> > -					clock), 1000 * htotal);
> > +	return div_u64(mul_u32_u32(scan_curr_time - scan_prev_time,
> > +				   clock), 1000 * htotal);
> > +}
> > +
> > +/*
> > + * On certain encoders on certain platforms, pipe
> > + * scanline register will not work to get the scanline,
> > + * since the timings are driven from the PORT or issues
> > + * with scanline register updates.
> > + * This function will use Framestamp and current
> > + * timestamp registers to calculate the scanline.
> > + */
> > +static u32 __intel_get_crtc_scanline_from_timestamp(struct intel_crtc *crtc)
> > +{
> > +	struct drm_vblank_crtc *vblank =
> > +		&crtc->base.dev->vblank[drm_crtc_index(&crtc->base)];
> > +	const struct drm_display_mode *mode = &vblank->hwmode;
> > +	u32 vblank_start = mode->crtc_vblank_start;
> > +	u32 vtotal = mode->crtc_vtotal;
> > +	u32 scanline;
> > +
> > +	scanline = intel_crtc_scanlines_since_frame_timestamp(crtc);
> >  	scanline = min(scanline, vtotal - 1);
> >  	scanline = (scanline + vblank_start) % vtotal;
> >  
> > -- 
> > 2.19.1
> > 
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