HW revision is mandatory field for DisplayPort branch devices. This is defined in DPCD register field 0x509.
v2: move drm_dp_ds_revision structure to be part of drm_dp_link structure (Daniel) v3: remove dependency to drm_dp_helper but instead parse DPCD and print HW revision info to dmesg (Ville)
Signed-off-by: Mika Kahola mika.kahola@intel.com --- drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++++++++++++++ include/drm/drm_dp_helper.h | 1 + 2 files changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3dab3bf..9aebdf6 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1419,6 +1419,25 @@ static void intel_dp_print_rates(struct intel_dp *intel_dp) DRM_DEBUG_KMS("common rates: %s\n", str); }
+static void intel_dp_print_hw_revision(struct intel_dp *intel_dp) +{ + uint8_t rev; + int len; + + if ((drm_debug & DRM_UT_KMS) == 0) + return; + + if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] & + DP_DWN_STRM_PORT_PRESENT)) + return; + + len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_HW_REV, &rev, 1); + if (len < 0) + return; + + DRM_DEBUG_KMS("sink hw revision: %d.%d\n", (rev & 0xf0) >> 4, rev & 0xf); +} + static int rate_to_index(int find, const int *rates) { int i = 0; @@ -4282,6 +4301,8 @@ intel_dp_long_pulse(struct intel_connector *intel_connector)
intel_dp_probe_oui(intel_dp);
+ intel_dp_print_hw_revision(intel_dp); + intel_dp_configure_mst(intel_dp);
if (intel_dp->is_mst) { diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index faea76b..19ac599 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -446,6 +446,7 @@ #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