drm/i915/dp: limit DP link rate based on VBT on CNL+
We have the max DP link rate info available in VBT since BDB version
216, included in child device config since commit c4fb60b9aba9
("drm/i915/bios: add DP max link rate to VBT child device
struct"). Parse it and use it.
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/a8b1364d1f2394fba3062b6ad11b474744ea4366.1517482774.git.jani.nikula@intel.com
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index cf3f8f1..4e74aa2 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1274,6 +1274,27 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
port_name(port), info->hdmi_boost_level);
}
+
+ /* DP max link rate for CNL+ */
+ if (bdb_version >= 216) {
+ switch (child->dp_max_link_rate) {
+ default:
+ case VBT_DP_MAX_LINK_RATE_HBR3:
+ info->dp_max_link_rate = 810000;
+ break;
+ case VBT_DP_MAX_LINK_RATE_HBR2:
+ info->dp_max_link_rate = 540000;
+ break;
+ case VBT_DP_MAX_LINK_RATE_HBR:
+ info->dp_max_link_rate = 270000;
+ break;
+ case VBT_DP_MAX_LINK_RATE_LBR:
+ info->dp_max_link_rate = 162000;
+ break;
+ }
+ DRM_DEBUG_KMS("VBT DP max link rate for port %c: %d\n",
+ port_name(port), info->dp_max_link_rate);
+ }
}
static void parse_ddi_ports(struct drm_i915_private *dev_priv, u8 bdb_version)