From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,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 EEA70C47083 for ; Wed, 2 Jun 2021 16:43:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA6FD619B2 for ; Wed, 2 Jun 2021 16:43:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229989AbhFBQpY (ORCPT ); Wed, 2 Jun 2021 12:45:24 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:64998 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229625AbhFBQpX (ORCPT ); Wed, 2 Jun 2021 12:45:23 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1622652220; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=u2Qrli205LtiGdqQxFTGNhNUHxXxKTQKpo6UMFiBbQ8=; b=QBpZDSIZaMyRRCHd7Lk/0709mCjkoXlZzI+y+2EiMutb91azXdp7OexZPyQ68MfAewUre87P 6ymwrx4cWfhjb3GajpigDCkGx3y8R3PrgTdevhmP8v8+OLWdL3IlJX0UDMXrnM8fx3+6kGjg i8rAy1Te6B4AGv85UgRyc9S9yQc= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd 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-east-1.postgun.com with SMTP id 60b7b5226ddc3305c43006fb (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 02 Jun 2021 16:43:14 GMT Sender: khsieh=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id CA6BFC43217; Wed, 2 Jun 2021 16:43:13 +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 A1E57C433D3; Wed, 2 Jun 2021 16:43:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A1E57C433D3 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, vkoul@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org Cc: abhinavk@codeaurora.org, aravindh@codeaurora.org, khsieh@codeaurora.org, freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4] drm/msm/dp: power off DP phy at suspend Date: Wed, 2 Jun 2021 09:43:05 -0700 Message-Id: <1622652185-7157-1-git-send-email-khsieh@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Normal DP suspend operation contains two steps, display off followed by dp suspend, to complete system wide suspending cycle if display is up at that time. In this case, DP phy will be powered off at display off. However there is an exception case that depending on the timing of dongle plug in during system wide suspending, sometimes display off procedure may be skipped and dp suspend was called directly. In this case, dp phy is stay at powered on (phy->power_count = 1) so that at next resume dp driver crash at main link clock enable due to phy is not physically powered on. This patch will call dp_ctrl_off_link_stream() to tear down main link and power off phy at dp_pm_suspend() if main link had been brought up. Changes in V2: -- stashed changes into dp_ctrl.c -- add is_phy_on to monitor phy state Changes in V3: -- delete is_phy_on -- call dp_ctrl_off_link_stream() from dp_pm_suspend() Changes in V4: -- delete changes made at dp_power.c -- move main link status checking to dp_pm_suspend Fixes: 0114f31a2903 ("drm/msm/dp: handle irq_hpd with sink_count = 0 correctly) Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 10 ++++++---- drivers/gpu/drm/msm/dp/dp_display.c | 7 ++++++- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index dbd8943..caf71fa 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1827,10 +1827,12 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl) dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false); - ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false); - if (ret) { - DRM_ERROR("Failed to disable pixel clocks. ret=%d\n", ret); - return ret; + if (dp_power_clk_status(ctrl->power, DP_STREAM_PM)) { + ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false); + if (ret) { + DRM_ERROR("Failed to disable pclk. ret=%d\n", ret); + return ret; + } } ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false); diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index cdec0a3..9c59def 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -1327,8 +1327,13 @@ static int dp_pm_suspend(struct device *dev) mutex_lock(&dp->event_mutex); - if (dp->core_initialized == true) + if (dp->core_initialized == true) { + /* mainlink enabled */ + if (dp_power_clk_status(dp->power, DP_CTRL_PM)) + dp_ctrl_off_link_stream(dp->ctrl); + dp_display_host_deinit(dp); + } dp->hpd_state = ST_SUSPENDED; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project