From patchwork Tue Nov 27 14:02:58 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 10700589 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6518A14BD for ; Tue, 27 Nov 2018 14:06:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 50E22285BE for ; Tue, 27 Nov 2018 14:06:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4236D28AD9; Tue, 27 Nov 2018 14:06:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0A403285BE for ; Tue, 27 Nov 2018 14:06:57 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 57F9A6E284; Tue, 27 Nov 2018 14:06:51 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1C4E86E27C; Tue, 27 Nov 2018 14:06:50 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Nov 2018 06:06:49 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,286,1539673200"; d="scan'208";a="112317471" Received: from mint-dev.iind.intel.com ([10.223.25.164]) by orsmga002.jf.intel.com with ESMTP; 27 Nov 2018 06:06:47 -0800 From: Ramalingam C To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, seanpaul@chromium.org, daniel.vetter@ffwll.ch Subject: [PATCH 3/4] drm/i915: debug log for REPLY_ACK missing Date: Tue, 27 Nov 2018 19:32:58 +0530 Message-Id: <1543327379-22629-4-git-send-email-ramalingam.c@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1543327379-22629-1-git-send-email-ramalingam.c@intel.com> References: <1543327379-22629-1-git-send-email-ramalingam.c@intel.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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. Signed-off-by: Ramalingam C Reviewed-by: Sean Paul --- drivers/gpu/drm/i915/intel_dp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 70ae3d57316b..18e3a5a3d873 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -5390,7 +5390,11 @@ 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; + ret = reply == DP_AUX_NATIVE_REPLY_ACK ? 0 : -EIO; + if (ret) + DRM_DEBUG_KMS("Aksv write: DP_AUX_NATIVE_REPLY_ACK missing\n"); + + return ret; } static int intel_dp_hdcp_read_bksv(struct intel_digital_port *intel_dig_port,