drm/i915/dp: centralize max source rate conditions more

Turn intel_dp_source_supports_hbr2() into a simple helper to query the
pre-filled source rates array, and move the conditions about which
platforms support which rates to the single point of truth in
intel_dp_set_source_rates().

This also reduces the code paths you have to think about in the source
rates initialization in intel_dp_set_source_rates(), making it easier to
grasp.

Cc: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171009092959.29021-2-jani.nikula@intel.com

1 files changed, 7 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index ca48bce23a6f..09d75df497c0 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -254,15 +254,15 @@ intel_dp_set_source_rates(struct intel_dp *intel_dp)
         } else if (IS_GEN9_BC(dev_priv)) {
                 source_rates = skl_rates;
                 size = ARRAY_SIZE(skl_rates);
-        } else {
+        } else if ((IS_HASWELL(dev_priv) && !IS_HSW_ULX(dev_priv)) ||
+                   IS_BROADWELL(dev_priv)) {
                 source_rates = default_rates;
                 size = ARRAY_SIZE(default_rates);
+        } else {
+                source_rates = default_rates;
+                size = ARRAY_SIZE(default_rates) - 1;
         }
 
-        /* This depends on the fact that 5.4 is last value in the array */
-        if (!intel_dp_source_supports_hbr2(intel_dp))
-                size--;
-
         intel_dp->source_rates = source_rates;
         intel_dp->num_source_rates = size;
 }
@@ -1482,14 +1482,9 @@ intel_dp_aux_init(struct intel_dp *intel_dp)
 
 bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp)
 {
-        struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
-        struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+        int max_rate = intel_dp->source_rates[intel_dp->num_source_rates - 1];
 
-        if ((IS_HASWELL(dev_priv) && !IS_HSW_ULX(dev_priv)) ||
-            IS_BROADWELL(dev_priv) || (INTEL_GEN(dev_priv) >= 9))
-                return true;
-        else
-                return false;
+        return max_rate >= 540000;
 }
 
 static void