On Thu, Apr 05, 2018 at 10:22:38AM -0700, Rodrigo Vivi wrote:
> On Thu, Apr 05, 2018 at 05:39:00PM +0300, Jani Nikula wrote:
> > The debug prints make more sense where the results are actually used,
> > and this cleans up extra clutter from the already overcrowded
> > intel_dp_compute_config().
> >
> > Signed-off-by: Jani Nikula <jani.nik...@intel.com>
> > ---
> > drivers/gpu/drm/i915/intel_dp.c | 9 ++-------
> > drivers/gpu/drm/i915/intel_dp_link_training.c | 5 +++++
> > 2 files changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > b/drivers/gpu/drm/i915/intel_dp.c
> > index 5f4b30faf6a2..81cf363e71af 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -1706,7 +1706,6 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> > int bpp, mode_rate;
> > int link_avail, link_clock;
> > int common_len;
> > - uint8_t link_bw, rate_select;
> > bool reduce_m_n = drm_dp_has_quirk(&intel_dp->desc,
> > DP_DPCD_QUIRK_LIMITED_M_N);
> >
> > @@ -1852,12 +1851,8 @@ intel_dp_compute_config(struct intel_encoder
> > *encoder,
> > pipe_config->pipe_bpp = bpp;
> > pipe_config->port_clock = intel_dp->common_rates[clock];
> >
> > - intel_dp_compute_rate(intel_dp, pipe_config->port_clock,
> > - &link_bw, &rate_select);
>
> the commit message state more about the debug message itself,
> but by removing this call here it seems that you change
> the behavior of eDP. So I couldn't follow the changes you are
> actually aiming to do here.
>
Actually in dp_compute_config(), we just compute the optimum port_clock
selected from the common_rates array. We dont really use rate_select or link_bw
here
in this function. These two parameters get used directly in the clock_recovery
where we either write rate_select or link_bw to the dpcd link config registers.
So by removing this call to intel_dp_compute_rate() from compute_config() makes
sense
to me. And it does not alter the eDP compute config behaviour.
However I think to be clear, the above explanation needs to be included in th
commit message.
With that included,
Reviewed-by: Manasi Navare <manasi.d.nav...@intel.com>
Manasi
> > -
> > - DRM_DEBUG_KMS("DP link bw %02x rate select %02x lane count %d clock %d
> > bpp %d\n",
> > - link_bw, rate_select, pipe_config->lane_count,
> > - pipe_config->port_clock, bpp);
> > + DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
> > + pipe_config->lane_count, pipe_config->port_clock, bpp);
> > DRM_DEBUG_KMS("DP link bw required %i available %i\n",
> > mode_rate, link_avail);
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c
> > b/drivers/gpu/drm/i915/intel_dp_link_training.c
> > index f59b59bb0a21..3fcaa98b9055 100644
> > --- a/drivers/gpu/drm/i915/intel_dp_link_training.c
> > +++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
> > @@ -139,6 +139,11 @@ intel_dp_link_training_clock_recovery(struct intel_dp
> > *intel_dp)
> > intel_dp_compute_rate(intel_dp, intel_dp->link_rate,
> > &link_bw, &rate_select);
> >
> > + if (link_bw)
> > + DRM_DEBUG_KMS("Using LINK_BW_SET value %02x\n", link_bw);
> > + else
> > + DRM_DEBUG_KMS("Using LINK_RATE_SET value %02x\n", rate_select);
> > +
> > /* Write the link configuration data */
> > link_config[0] = link_bw;
> > link_config[1] = intel_dp->lane_count;
> > --
> > 2.11.0
> >
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