Read DisplayPort branch device info from through debugfs
interface.
v2: use drm_dp_helper routines to collect data
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 66 +++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ac7e569..fabfa55 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2942,9 +2942,75 @@ static void intel_dp_info(struct seq_file *m,
{
struct intel_encoder *intel_encoder = intel_connector->encoder;
struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
+ struct drm_dp_revision rev;
+ bool is_branch_device;
+ int type;
+ int clk;
+ int bpc;
+ int cap_size;
+ uint8_t cap[4];
+ char id[6];
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));
+
+ 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) {
+ cap_size = drm_dp_downstream_port_cap(&intel_dp->aux,
+ intel_dp->dpcd, cap);
+
+ type = drm_dp_downstream_type(intel_dp->dpcd, cap);
+
+ 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 (cap_size == 4) {
+ clk = drm_dp_downstream_max_clock(intel_dp->dpcd, cap);
+ 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, cap);
+ seq_printf(m, "\tMax bpc: %d\n", bpc);
+ }
+ }
+
if (intel_encoder->type == INTEL_OUTPUT_EDP)
intel_panel_info(m, &intel_connector->panel);
}
--
1.9.1
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
