From patchwork Thu Jun 3 23:49:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12298435 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,USER_AGENT_GIT autolearn=unavailable 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 0E87BC47096 for ; Thu, 3 Jun 2021 23:49:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E85E26140A for ; Thu, 3 Jun 2021 23:49:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229758AbhFCXvi (ORCPT ); Thu, 3 Jun 2021 19:51:38 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:63682 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229685AbhFCXvi (ORCPT ); Thu, 3 Jun 2021 19:51:38 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1622764193; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=o1I/qHRsZyVY+hH5gJnA9ezwSvhf5J73xu0kbc1BX7o=; b=fOOGh435EAmA9W7G8DB0vkzVYsqYo53UyNiJBx1rrlSRynnQJR53qtq61jiSt2S8YNIESGeu yMJq2P0Tn/1pavHSEHXB7jFA4XtuTA4PnO+wNH0j+y4SiUivSK9tv9Nd9dg0bM9p9MHvOTO9 QZaUbZ2yt8SpB71tH36hRFNGL+g= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-west-2.postgun.com with SMTP id 60b96a97ed59bf69cc0a880e (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 03 Jun 2021 23:49:43 GMT Sender: khsieh=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 662D0C4360C; Thu, 3 Jun 2021 23:49:43 +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 BF34BC433D3; Thu, 3 Jun 2021 23:49:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org BF34BC433D3 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, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5] drm/msm/dp: power off DP phy at suspend Date: Thu, 3 Jun 2021 16:49:34 -0700 Message-Id: <1622764174-10309-1-git-send-email-khsieh@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@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 Changes in V5: -- correct commit id at Fixes tag Fixes: 8dbde399044b ("drm/msm/dp: handle irq_hpd with sink_count = 0 correctly) Signed-off-by: Kuogee Hsieh Tested-by: Stephen Boyd Reviewed-by: Stephen Boyd --- 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;