If branch device advertise dummy enough sink, bail out early trusting to sink count instead of falling back to ddc probe which is deemed to fail.
References: https://bugs.freedesktop.org/show_bug.cgi?id=60263 Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com> --- drivers/gpu/drm/i915/intel_dp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 8c70a83..703767e 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -2786,9 +2786,15 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp) if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT)) return connector_status_connected; + /* Analog or other */ +#define DP_PORT_TYPE_DUMMY 0x2 + /* If we're HPD-aware, SINK_COUNT changes dynamically */ hpd = !!(intel_dp->downstream_ports[0] & DP_DS_PORT_HPD); - if (hpd) { + + /* ...and if the downstream port type is dummy enough + * dont fall into ddc probe as it will fail */ + if (hpd || dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_PORT_TYPE_DUMMY) { uint8_t reg; if (!intel_dp_aux_native_read_retry(intel_dp, DP_SINK_COUNT, ®, 1)) -- 1.7.9.5 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
