HW revision is mandatory field for DisplayPort branch
devices. This is defined in DPCD register field 0x509.
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 5 +++++
include/drm/drm_dp_helper.h | 2 ++
2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2b768da..12ab26b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3463,6 +3463,11 @@ intel_dp_probe_oui(struct intel_dp *intel_dp)
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);
+
+ if (drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_HW_REV, &intel_dp->bd.hw_rev,
+ sizeof(intel_dp->bd.hw_rev)) == sizeof(intel_dp->bd.hw_rev))
+ DRM_DEBUG_KMS("HW revision: %.2d.%.2d\n",
+ intel_dp->bd.hw_rev & 0xf, (intel_dp->bd.hw_rev>>4) & 0xf);
}
}
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index f1fc4e2..d0965ca 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -458,6 +458,7 @@
#define DP_SINK_OUI 0x400
#define DP_BRANCH_OUI 0x500
#define DP_BRANCH_ID 0x503
+#define DP_BRANCH_HW_REV 0x509
#define DP_SET_POWER 0x600
# define DP_SET_POWER_D0 0x1
@@ -871,6 +872,7 @@ struct drm_dp_bd {
int type;
bool hpd;
uint8_t id[6];
+ uint8_t hw_rev;
union {
struct drm_dp_vga vga;
struct drm_dp_dvi dvi;
--
1.9.1
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