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drm/i915/dp_tunnel: Query max BW config via link_caps for BW computation

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Query the maximum link BW configuration via the link caps interface to
compute the available TBT bandwidth. Unlike the max common link params
used so far for this, the max BW config also accounts for any forced
link parameters.

This makes the max BW link config query uniform across mode validation
and TBT BW calculation, and allows unexporting the
intel_dp_link_caps_max_common_lane_count() helper.

v2: Use the max BW link configuration, instead of the max link limits.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-16-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-07-01 18:31:44 +03:00
parent cae2b26d2f
commit 9fe6cae318
3 changed files with 6 additions and 5 deletions
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2
drivers/gpu/drm/i915/display/intel_dp_link_caps.c
View File

@ -290,7 +290,7 @@ void intel_dp_link_caps_print_common_rates(struct intel_dp_link_caps *link_caps)
drm_dbg_kms(display->drm, "common rates: %s\n", seq_buf_str(&s));
}
int intel_dp_link_caps_max_common_lane_count(struct intel_dp_link_caps *link_caps)
static int intel_dp_link_caps_max_common_lane_count(struct intel_dp_link_caps *link_caps)
{
return link_caps->max_lane_count;
}

1
drivers/gpu/drm/i915/display/intel_dp_link_caps.h
View File

@ -125,7 +125,6 @@ int intel_dp_common_rate(struct intel_dp_link_caps *link_caps, int index);
int intel_dp_link_caps_common_rate_idx(struct intel_dp_link_caps *link_caps, int rate);
int intel_dp_max_common_rate(struct intel_dp_link_caps *link_caps);
int intel_dp_link_caps_num_common_rates(struct intel_dp_link_caps *link_caps);
int intel_dp_link_caps_max_common_lane_count(struct intel_dp_link_caps *link_caps);
void intel_dp_link_caps_print_common_rates(struct intel_dp_link_caps *link_caps);

8
drivers/gpu/drm/i915/display/intel_dp_tunnel.c
View File

@ -58,10 +58,12 @@ static int kbytes_to_mbits(int kbytes)
static int get_current_link_bw(struct intel_dp *intel_dp)
{
struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
int rate = intel_dp_max_common_rate(link_caps);
int lane_count = intel_dp_link_caps_max_common_lane_count(link_caps);
struct intel_dp_link_config max_bw_config;
return intel_dp_max_link_data_rate(intel_dp, rate, lane_count);
intel_dp_link_caps_get_max_bw_config(link_caps, &max_bw_config);
return intel_dp_max_link_data_rate(intel_dp, max_bw_config.rate,
max_bw_config.lane_count);
}
static int __update_tunnel_state(struct intel_dp *intel_dp, bool force_sink_update)