From 4cf74aafc55bef8725d1d30f7d3449fb86c1710f Mon Sep 17 00:00:00 2001 From: Ramalingam C Date: Wed, 5 Dec 2018 17:14:42 +0530 Subject: [PATCH] drm/i915: debug log for REPLY_ACK missing Adding a debug log when the DP_AUX_NATIVE_REPLY_ACK is missing for aksv write. This helps to locate the possible non responding DP HDCP sinks. v2: Rewritten for readability [Sean Paul] Signed-off-by: Ramalingam C Reviewed-by: Sean Paul Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/1544010283-20223-4-git-send-email-ramalingam.c@intel.com --- drivers/gpu/drm/i915/intel_dp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index de4219721cbc..e94faa0a42eb 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -5616,7 +5616,12 @@ int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port, } reply = (rxbuf[0] >> 4) & DP_AUX_NATIVE_REPLY_MASK; - return reply == DP_AUX_NATIVE_REPLY_ACK ? 0 : -EIO; + if (reply != DP_AUX_NATIVE_REPLY_ACK) { + DRM_DEBUG_KMS("Aksv write: no DP_AUX_NATIVE_REPLY_ACK %x\n", + reply); + return -EIO; + } + return 0; } static int intel_dp_hdcp_read_bksv(struct intel_digital_port *intel_dig_port, -- GitLab