[PATCH 14/21] drm/dp: Use drm_dp_aux_rd_interval()

[Thierry Reding]

On Thu, Aug 08, 2019 at 03:17:33PM +0200, Philipp Zabel wrote:
> On Mon, 2019-08-05 at 14:23 +0200, Thierry Reding wrote:
> > From: Thierry Reding <treding at nvidia.com>
> > 
> > Make use of the newly added drm_dp_aux_rd_interval() helper in existing
> > DP link training helpers and add comments about minimum required delays
> > mandated by the DP specification.
> 
> This patch does not add any comments:

Indeed, I think this is a left-over comment from when this hadn't been
split apart from patch "drm/dp: Read AUX read interval from DPCD".

I've dropped that second part in v2.

Thierry

> 
> > 
> > Signed-off-by: Thierry Reding <treding at nvidia.com>
> > ---
> >  drivers/gpu/drm/drm_dp_helper.c | 26 +++-----------------------
> >  1 file changed, 3 insertions(+), 23 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> > index 344f887fef2c..1fb3c27cd012 100644
> > --- a/drivers/gpu/drm/drm_dp_helper.c
> > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > @@ -122,17 +122,7 @@ EXPORT_SYMBOL(drm_dp_get_adjust_request_pre_emphasis);
> >  
> >  void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> >  {
> > -	unsigned int rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
> > -					DP_TRAINING_AUX_RD_MASK;
> > -
> > -	if (rd_interval > 4)
> > -		DRM_DEBUG_KMS("AUX interval %u, out of range (max 4)\n",
> > -			      rd_interval);
> > -
> > -	if (rd_interval == 0 || dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14)
> > -		rd_interval = 100;
> > -	else
> > -		rd_interval *= 4;
> > +	unsigned int rd_interval = drm_dp_aux_rd_interval(dpcd);
> >  
> >  	usleep_range(rd_interval, rd_interval * 2);
> >  }
> > @@ -140,19 +130,9 @@ EXPORT_SYMBOL(drm_dp_link_train_clock_recovery_delay);
> >  
> >  void drm_dp_link_train_channel_eq_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> >  {
> > -	unsigned int rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
> > -					DP_TRAINING_AUX_RD_MASK;
> > -
> > -	if (rd_interval > 4)
> > -		DRM_DEBUG_KMS("AUX interval %u, out of range (max 4)\n",
> > -			      rd_interval);
> > +	unsigned int min = drm_dp_aux_rd_interval(dpcd);
> >  
> > -	if (rd_interval == 0)
> > -		rd_interval = 400;
> > -	else
> > -		rd_interval *= 4;
> > -
> > -	usleep_range(rd_interval, rd_interval * 2);
> > +	usleep_range(min, min * 2);
> >  }
> >  EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay);
> >  
> 
> regards
> Philipp
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