[Intel-gfx] [PATCH v2] drm/i915/hdcp: debug logs for sink related failures

[Shankar, Uma]

>-----Original Message-----
>From: C, Ramalingam
>Sent: Monday, July 8, 2019 5:03 PM
>To: intel-gfx <intel-gfx at lists.freedesktop.org>; Daniel Vetter <daniel at ffwll.ch>
>Cc: Shankar, Uma <uma.shankar at intel.com>; C, Ramalingam
><ramalingam.c at intel.com>
>Subject: [PATCH v2] drm/i915/hdcp: debug logs for sink related failures
>
>Adding few more debug logs to identify the sink specific HDCP failures along with a
>out of mem failure.
>
>v2:
>  Capturing the Bug and a-b
>
>Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110991
>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>cc: Daniel Vetter <daniel at ffwll.ch>
>Acked-by: Daniel Vetter <daniel at ffwll.ch>
>---

Pushed to dinq. Thanks for the patch.

Regards,
Uma Shankar

> drivers/gpu/drm/i915/display/intel_hdcp.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
>b/drivers/gpu/drm/i915/display/intel_hdcp.c
>index bc3a94d491c4..a78139f9e847 100644
>--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
>+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
>@@ -523,12 +523,16 @@ int intel_hdcp_auth_downstream(struct intel_connector
>*connector)
> 	 * authentication.
> 	 */
> 	num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
>-	if (num_downstream == 0)
>+	if (num_downstream == 0) {
>+		DRM_DEBUG_KMS("Repeater with zero downstream devices\n");
> 		return -EINVAL;
>+	}
>
> 	ksv_fifo = kcalloc(DRM_HDCP_KSV_LEN, num_downstream, GFP_KERNEL);
>-	if (!ksv_fifo)
>+	if (!ksv_fifo) {
>+		DRM_DEBUG_KMS("Out of mem: ksv_fifo\n");
> 		return -ENOMEM;
>+	}
>
> 	ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo);
> 	if (ret)
>@@ -1206,8 +1210,10 @@ static int hdcp2_authentication_key_exchange(struct
>intel_connector *connector)
> 	if (ret < 0)
> 		return ret;
>
>-	if (msgs.send_cert.rx_caps[0] != HDCP_2_2_RX_CAPS_VERSION_VAL)
>+	if (msgs.send_cert.rx_caps[0] != HDCP_2_2_RX_CAPS_VERSION_VAL) {
>+		DRM_DEBUG_KMS("cert.rx_caps dont claim HDCP2.2\n");
> 		return -EINVAL;
>+	}
>
> 	hdcp->is_repeater = HDCP_2_2_RX_REPEATER(msgs.send_cert.rx_caps[2]);
>
>--
>2.19.1