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drm/i915/dp_link_caps: Add debugfs entry showing allowed configurations

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Add a debugfs entry showing the currently allowed link configurations
in the connector's iteration order.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-12-imre.deak@intel.com
This commit is contained in:
Imre Deak
2026-07-01 18:31:40 +03:00
parent ac24d562f4
commit cf65aa9de6
1 changed files with 40 additions and 0 deletions
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40
drivers/gpu/drm/i915/display/intel_dp_link_caps.c
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@@ -1123,6 +1123,43 @@ static int i915_dp_max_lane_count_show(void *data, u64 *val)
}
DEFINE_DEBUGFS_ATTRIBUTE(i915_dp_max_lane_count_fops, i915_dp_max_lane_count_show, NULL, "%llu\n");
static int intel_dp_allowed_link_configs_show(struct seq_file *m, void *data)
{
struct intel_connector *connector = to_intel_connector(m->private);
struct intel_display *display = to_intel_display(connector);
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
struct intel_dp_link_config link_config;
struct intel_dp_link_caps_iter iter;
int err;
int i;
err = drm_modeset_lock_single_interruptible(&display->drm->mode_config.connection_mutex);
if (err)
return err;
intel_dp_flush_connector_commits(connector);
i = 0;
intel_dp_link_caps_iter_start(&iter,
link_caps,
intel_dp_link_caps_connector_compute_order(connector),
INTEL_DP_LINK_CAPS_FILTER_ALL);
for_each_dp_link_config(&iter, &link_config) {
seq_printf(m, "%s%dx%d",
i ? " " : "",
link_config.lane_count, link_config.rate);
i++;
}
intel_dp_link_caps_iter_end(&iter);
drm_modeset_unlock(&display->drm->mode_config.connection_mutex);
seq_putc(m, '\n');
return 0;
}
DEFINE_SHOW_ATTRIBUTE(intel_dp_allowed_link_configs);
/**
* intel_dp_link_caps_debugfs_add - add link caps debugfs files for a connector
@@ -1149,6 +1186,9 @@ void intel_dp_link_caps_debugfs_add(struct intel_connector *connector)
debugfs_create_file("i915_dp_max_lane_count", 0444, root,
connector, &i915_dp_max_lane_count_fops);
debugfs_create_file("intel_dp_allowed_link_configs", 0444, root,
connector, &intel_dp_allowed_link_configs_fops);
}
struct intel_dp_link_caps *intel_dp_link_caps_init(struct intel_dp *intel_dp)