Add intel_dp_max_link_data_rate() to get the link BW vs. the sink DPRX
BW used by a follow-up patch enabling the DP tunnel BW allocation mode.
The link BW can be below the DPRX BW due to a BW limitation on a link
shared by multiple sinks.
Signed-off-by: Imre Deak <imre.d...@intel.com>
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 32 +++++++++++++++++----
drivers/gpu/drm/i915/display/intel_dp.h | 2 ++
drivers/gpu/drm/i915/display/intel_dp_mst.c | 3 +-
3 files changed, 30 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
b/drivers/gpu/drm/i915/display/intel_dp.c
index 520c04245c2df..d9e75922ff8f5 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -383,6 +383,22 @@ int intel_dp_effective_data_rate(int pixel_clock, int
bpp_x16,
1000000 * 16 * 8);
}
+/**
+ * intel_dp_max_link_data_rate: Calculate the maximum rate for the given link
params
+ * @intel_dp: Intel DP object
+ * @max_dprx_rate: Maximum data rate of the DPRX
+ * @max_dprx_lanes: Maximum lane count of the DPRX
+ *
+ * Calculate the maximum data rate for the provided link parameters.
+ *
+ * Returns the maximum data rate in kBps units.
+ */
+int intel_dp_max_link_data_rate(struct intel_dp *intel_dp,
+ int max_dprx_rate, int max_dprx_lanes)
+{
+ return drm_dp_max_dprx_data_rate(max_dprx_rate, max_dprx_lanes);
+}
+
bool intel_dp_can_bigjoiner(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
@@ -612,7 +628,7 @@ static bool intel_dp_can_link_train_fallback_for_edp(struct
intel_dp *intel_dp,
int mode_rate, max_rate;
mode_rate = intel_dp_link_required(fixed_mode->clock, 18);
- max_rate = drm_dp_max_dprx_data_rate(link_rate, lane_count);
+ max_rate = intel_dp_max_link_data_rate(intel_dp, link_rate, lane_count);
if (mode_rate > max_rate)
return false;
@@ -1216,7 +1232,8 @@ intel_dp_mode_valid(struct drm_connector *_connector,
max_link_clock = intel_dp_max_link_rate(intel_dp);
max_lanes = intel_dp_max_lane_count(intel_dp);
- max_rate = drm_dp_max_dprx_data_rate(max_link_clock, max_lanes);
+ max_rate = intel_dp_max_link_data_rate(intel_dp, max_link_clock,
max_lanes);
+
mode_rate = intel_dp_link_required(target_clock,
intel_dp_mode_min_output_bpp(connector, mode));
@@ -1566,8 +1583,10 @@ intel_dp_compute_link_config_wide(struct intel_dp
*intel_dp,
for (lane_count = limits->min_lane_count;
lane_count <= limits->max_lane_count;
lane_count <<= 1) {
- link_avail =
drm_dp_max_dprx_data_rate(link_rate,
-
lane_count);
+ link_avail =
intel_dp_max_link_data_rate(intel_dp,
+
link_rate,
+
lane_count);
+
if (mode_rate <= link_avail) {
pipe_config->lane_count = lane_count;
@@ -2427,8 +2446,9 @@ intel_dp_compute_link_config(struct intel_encoder
*encoder,
pipe_config->pipe_bpp,
BPP_X16_ARGS(pipe_config->dsc.compressed_bpp_x16),
intel_dp_config_required_rate(pipe_config),
- drm_dp_max_dprx_data_rate(pipe_config->port_clock,
- pipe_config->lane_count));
+ intel_dp_max_link_data_rate(intel_dp,
+ pipe_config->port_clock,
+ pipe_config->lane_count));
return 0;
}
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h
b/drivers/gpu/drm/i915/display/intel_dp.h
index 10e859b62bbe9..564a587e2d018 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -115,6 +115,8 @@ bool intel_dp_get_colorimetry_status(struct intel_dp
*intel_dp);
int intel_dp_link_required(int pixel_clock, int bpp);
int intel_dp_effective_data_rate(int pixel_clock, int bpp_x16,
int bw_overhead);
+int intel_dp_max_link_data_rate(struct intel_dp *intel_dp,
+ int max_dprx_rate, int max_dprx_lanes);
bool intel_dp_can_bigjoiner(struct intel_dp *intel_dp);
bool intel_dp_needs_vsc_sdp(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index b4d4bb90126e9..4b6c8ff974297 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1299,7 +1299,8 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector
*connector,
max_link_clock = intel_dp_max_link_rate(intel_dp);
max_lanes = intel_dp_max_lane_count(intel_dp);
- max_rate = drm_dp_max_dprx_data_rate(max_link_clock, max_lanes);
+ max_rate = intel_dp_max_link_data_rate(intel_dp,
+ max_link_clock, max_lanes);
mode_rate = intel_dp_link_required(mode->clock, min_bpp);
ret = drm_modeset_lock(&mgr->base.lock, ctx);
--
2.39.2
