Read device ID for DisplayPort branch devices. The device
ID is defined in DPCD register 0x503 and it is mandatory field
for DP branch devices.
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 6 ++++++
include/drm/drm_dp_helper.h | 2 ++
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5e16063..2b768da 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3458,6 +3458,12 @@ intel_dp_probe_oui(struct intel_dp *intel_dp)
if (drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_OUI, buf, 3) == 3)
DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
buf[0], buf[1], buf[2]);
+
+ if (intel_dp->bd.present) {
+ if (drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_ID, intel_dp->bd.id,
+ sizeof(intel_dp->bd.id)) == sizeof(intel_dp->bd.id))
+ DRM_DEBUG_KMS("Device ID: %s\n", intel_dp->bd.id);
+ }
}
static bool
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index ee4084d..f1fc4e2 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -457,6 +457,7 @@
#define DP_SOURCE_OUI 0x300
#define DP_SINK_OUI 0x400
#define DP_BRANCH_OUI 0x500
+#define DP_BRANCH_ID 0x503
#define DP_SET_POWER 0x600
# define DP_SET_POWER_D0 0x1
@@ -869,6 +870,7 @@ struct drm_dp_bd {
bool present;
int type;
bool hpd;
+ uint8_t id[6];
union {
struct drm_dp_vga vga;
struct drm_dp_dvi dvi;
--
1.9.1
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