| Message ID | 1477093543-11622-5-git-send-email-manasi.d.navare@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 2016-10-21 at 16:45 -0700, Manasi Navare wrote: > This is required to return the index of link rate into > common_rates array. This gets used to retry the link > training at lower link rate. > > Cc: Jani Nikula <jani.nikula@linux.intel.com> > Cc: Daniel Vetter <daniel.vetter@intel.com> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> > --- > drivers/gpu/drm/i915/intel_dp.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c > index c499ec1..c192e18 100644 > --- a/drivers/gpu/drm/i915/intel_dp.c > +++ b/drivers/gpu/drm/i915/intel_dp.c > @@ -288,6 +288,21 @@ static int intel_dp_common_rates(struct intel_dp *intel_dp, > common_rates); > } > > +static int intel_dp_link_rate_index(struct intel_dp *intel_dp, > + int *common_rates, int link_rate) > +{ > + int common_len; > + int index; > + > + common_len = intel_dp_common_rates(intel_dp, common_rates); > + for (index = 0; index < common_len; index++) { Running the loop in the opposite direction will eliminate the unnecessary array index computations. > + if (link_rate == common_rates[common_len - index - 1]) > + return common_len - index - 1; > + } > + > + return -1; > +} > + > static enum drm_mode_status > intel_dp_mode_valid(struct drm_connector *connector, > struct drm_display_mode *mode)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index c499ec1..c192e18 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -288,6 +288,21 @@ static int intel_dp_common_rates(struct intel_dp *intel_dp, common_rates); } +static int intel_dp_link_rate_index(struct intel_dp *intel_dp, + int *common_rates, int link_rate) +{ + int common_len; + int index; + + common_len = intel_dp_common_rates(intel_dp, common_rates); + for (index = 0; index < common_len; index++) { + if (link_rate == common_rates[common_len - index - 1]) + return common_len - index - 1; + } + + return -1; +} + static enum drm_mode_status intel_dp_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode)
This is required to return the index of link rate into common_rates array. This gets used to retry the link training at lower link rate. Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> --- drivers/gpu/drm/i915/intel_dp.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)