[Intel-gfx] [PATCH 12/12] drm/i915: Parse DP/eDP max lane count from VBT
Ville Syrjala
ville.syrjala at linux.intel.com
Fri Jul 15 20:20:44 UTC 2022
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Limit the DP lane count based on the new VBT DP/eDP max
lane count field.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_bios.c | 16 ++++++++++++++++
drivers/gpu/drm/i915/display/intel_bios.h | 1 +
drivers/gpu/drm/i915/display/intel_dp.c | 13 ++++++++++++-
3 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index cd86b65055ef..d8063c329b3a 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2489,6 +2489,14 @@ static int _intel_bios_dp_max_link_rate(const struct intel_bios_encoder_data *de
return parse_bdb_216_dp_max_link_rate(devdata->child.dp_max_link_rate);
}
+static int _intel_bios_dp_max_lane_count(const struct intel_bios_encoder_data *devdata)
+{
+ if (!devdata || devdata->i915->vbt.version < 244)
+ return 0;
+
+ return devdata->child.dp_max_lane_count + 1;
+}
+
static void sanitize_device_type(struct intel_bios_encoder_data *devdata,
enum port port)
{
@@ -3674,6 +3682,14 @@ int intel_bios_dp_max_link_rate(struct intel_encoder *encoder)
return _intel_bios_dp_max_link_rate(devdata);
}
+int intel_bios_dp_max_lane_count(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ const struct intel_bios_encoder_data *devdata = i915->vbt.ports[encoder->port];
+
+ return _intel_bios_dp_max_lane_count(devdata);
+}
+
int intel_bios_alternate_ddc_pin(struct intel_encoder *encoder)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
diff --git a/drivers/gpu/drm/i915/display/intel_bios.h b/drivers/gpu/drm/i915/display/intel_bios.h
index e47582b0de0a..e375405a7828 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.h
+++ b/drivers/gpu/drm/i915/display/intel_bios.h
@@ -258,6 +258,7 @@ bool intel_bios_get_dsc_params(struct intel_encoder *encoder,
int intel_bios_max_tmds_clock(struct intel_encoder *encoder);
int intel_bios_hdmi_level_shift(struct intel_encoder *encoder);
int intel_bios_dp_max_link_rate(struct intel_encoder *encoder);
+int intel_bios_dp_max_lane_count(struct intel_encoder *encoder);
int intel_bios_alternate_ddc_pin(struct intel_encoder *encoder);
bool intel_bios_port_supports_typec_usb(struct drm_i915_private *i915, enum port port);
bool intel_bios_port_supports_tbt(struct drm_i915_private *i915, enum port port);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 32292c0be2bd..0370c4c105dc 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -286,11 +286,22 @@ static int intel_dp_max_common_rate(struct intel_dp *intel_dp)
return intel_dp_common_rate(intel_dp, intel_dp->num_common_rates - 1);
}
+static int intel_dp_max_source_lane_count(struct intel_digital_port *dig_port)
+{
+ int vbt_max_lanes = intel_bios_dp_max_lane_count(&dig_port->base);
+ int max_lanes = dig_port->max_lanes;
+
+ if (vbt_max_lanes)
+ max_lanes = min(max_lanes, vbt_max_lanes);
+
+ return max_lanes;
+}
+
/* Theoretical max between source and sink */
static int intel_dp_max_common_lane_count(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
- int source_max = dig_port->max_lanes;
+ int source_max = intel_dp_max_source_lane_count(dig_port);
int sink_max = intel_dp->max_sink_lane_count;
int fia_max = intel_tc_port_fia_max_lane_count(dig_port);
int lttpr_max = drm_dp_lttpr_max_lane_count(intel_dp->lttpr_common_caps);
--
2.35.1
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