From patchwork Wed Apr 21 23:37:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12217155 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 476EBC433B4 for ; Wed, 21 Apr 2021 23:38:19 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 05DED61427 for ; Wed, 21 Apr 2021 23:38:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 05DED61427 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6E5BA89FEA; Wed, 21 Apr 2021 23:38:18 +0000 (UTC) Received: from m43-7.mailgun.net (m43-7.mailgun.net [69.72.43.7]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5101289FEA for ; Wed, 21 Apr 2021 23:38:13 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1619048296; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=8BP+eMH3HNp0YASI+KjmXU1rq+O86jtgvX5SsgJB5bE=; b=ZRT7NWFPbBAezWYGy+XVkFdcB5JUJtlsInxt8/JB+C8Mb6wXC9jJlIeZAWlsCsd7IKqi8Pkg ybuB/mvVVf2Zp5b7RNVfsB5vU9R06TD2pLPRGlILKs+OOLKBvdKC57W8HlNyInxdkCI3hHeR iOYK7SpWx7cmVOtJ8oThL2TDSTU= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyJkOTU5ZSIsICJkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n03.prod.us-west-2.postgun.com with SMTP id 6080b75fe0e9c9a6b60fc84e (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 21 Apr 2021 23:38:07 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id B5273C4338A; Wed, 21 Apr 2021 23:38:07 +0000 (UTC) Received: from khsieh-linux1.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: khsieh) by smtp.codeaurora.org (Postfix) with ESMTPSA id 78946C4338A; Wed, 21 Apr 2021 23:38:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 78946C4338A Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=khsieh@codeaurora.org From: Kuogee Hsieh To: robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org Subject: [PATCH v4 3/4] drm/msm/dp: check main link status before start aux read Date: Wed, 21 Apr 2021 16:37:37 -0700 Message-Id: <1619048258-8717-4-git-send-email-khsieh@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1619048258-8717-1-git-send-email-khsieh@codeaurora.org> References: <1619048258-8717-1-git-send-email-khsieh@codeaurora.org> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, abhinavk@codeaurora.org, Kuogee Hsieh , dri-devel@lists.freedesktop.org, aravindh@codeaurora.org, freedreno@lists.freedesktop.org MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Maybe when the cable is disconnected the DP phy should be shutdown and some bit in the phy could effectively "cut off" the aux channel and then NAKs would start coming through here in the DP controller I/O register space. This patch have DP aux channel read/write to return NAK immediately if DP controller connection status is in unplugged state. Changes in V4: -- split this patch as stand alone patch Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_aux.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c index 7c22bfe..fae3806 100644 --- a/drivers/gpu/drm/msm/dp/dp_aux.c +++ b/drivers/gpu/drm/msm/dp/dp_aux.c @@ -343,6 +343,11 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux, mutex_lock(&aux->mutex); + if (!dp_catalog_link_is_connected(aux->catalog)) { + ret = -ETIMEDOUT; + goto unlock_exit; + } + aux->native = msg->request & (DP_AUX_NATIVE_WRITE & DP_AUX_NATIVE_READ); /* Ignore address only message */