Read DisplayPort branch device info from through debugfs
interface.
v2: use drm_dp_helper routines to collect data
v3: cleanup to match the drm_dp_helper.c patches introduced
earlier in this series
v4: move DP branch device info to function 'intel_dp_branch_device_info()'
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 75 +++++++++++++++++++++++++++++++++++++
1 file changed, 75 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 9989b6a..7f57b3c 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2942,16 +2942,91 @@ static void intel_panel_info(struct seq_file *m, struct intel_panel *panel)
intel_seq_print_mode(m, 2, mode);
}
+static void intel_dp_branch_device_info(struct seq_file *m, struct intel_dp *intel_dp)
+{
+ struct drm_dp_revision rev;
+ bool detailed_cap_info = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+ DP_DETAILED_CAP_INFO_AVAILABLE;
+ int type;
+ int clk;
+ int bpc;
+ char id[6];
+
+ type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
+
+ switch (type) {
+ case DP_DS_PORT_TYPE_DP:
+ seq_printf(m, "\ttype: DisplayPort\n");
+ break;
+ case DP_DS_PORT_TYPE_VGA:
+ seq_printf(m, "\ttype: VGA\n");
+ break;
+ case DP_DS_PORT_TYPE_DVI:
+ seq_printf(m, "\ttype: DVI\n");
+ break;
+ case DP_DS_PORT_TYPE_HDMI:
+ seq_printf(m, "\ttype: HDMI\n");
+ break;
+ case DP_DS_PORT_TYPE_NON_EDID:
+ seq_printf(m, "\ttype: others without EDID support\n");
+ break;
+ case DP_DS_PORT_TYPE_DP_DUALMODE:
+ seq_printf(m, "\ttype: DP++\n");
+ break;
+ case DP_DS_PORT_TYPE_WIRELESS:
+ seq_printf(m, "\ttype: Wireless\n");
+ break;
+ default:
+ seq_printf(m, "\ttype: N/A\n");
+ }
+
+ drm_dp_downstream_id(&intel_dp->aux, id);
+ seq_printf(m, "\tDevice id: %s\n", id);
+
+ rev = drm_dp_downstream_hw_rev(&intel_dp->aux);
+ seq_printf(m, "\tHW revision: %.2d.%.2d\n", rev.major, rev.minor);
+
+ rev = drm_dp_downstream_sw_rev(&intel_dp->aux);
+ seq_printf(m, "\tSW revision: %.2d.%.2d\n", rev.major, rev.minor);
+
+ if (detailed_cap_info) {
+ clk = drm_dp_downstream_max_clock(intel_dp->dpcd,
+ intel_dp->downstream_ports);
+
+ if (clk > 0) {
+ if (type == DP_DS_PORT_TYPE_VGA)
+ seq_printf(m, "\tMax dot clock: %d kHz\n", clk);
+ else
+ seq_printf(m, "\tMax TMDS clock: %d kHz\n", clk);
+ }
+
+ bpc = drm_dp_downstream_max_bpc(intel_dp->dpcd,
+ intel_dp->downstream_ports);
+
+ if (bpc > 0)
+ seq_printf(m, "\tMax bpc: %d\n", bpc);
+ }
+}
+
static void intel_dp_info(struct seq_file *m,
struct intel_connector *intel_connector)
{
struct intel_encoder *intel_encoder = intel_connector->encoder;
struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
+ bool is_branch_device;
seq_printf(m, "\tDPCD rev: %x\n", intel_dp->dpcd[DP_DPCD_REV]);
seq_printf(m, "\taudio support: %s\n", yesno(intel_dp->has_audio));
+
if (intel_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
intel_panel_info(m, &intel_connector->panel);
+
+ is_branch_device = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
+ DP_DWN_STRM_PORT_PRESENT;
+ seq_printf(m, "\tbranch device: %s\n", yesno(is_branch_device));
+
+ if (is_branch_device)
+ intel_dp_branch_device_info(m, intel_dp);
}
static void intel_hdmi_info(struct seq_file *m,
--
1.9.1
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