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=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 062A5C2B9F7 for ; Fri, 28 May 2021 18:09:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D2046613B5 for ; Fri, 28 May 2021 18:09:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229541AbhE1SKo (ORCPT ); Fri, 28 May 2021 14:10:44 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:62967 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229450AbhE1SKm (ORCPT ); Fri, 28 May 2021 14:10:42 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1622225347; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=r1zhZYhMoSYg6a1HMnFXMjdjXy3nkmF+hSZFTbu8j3k=; b=aJgaBHVZi+W+T3BRx+WEvxqNgq2jnDYhHLMVFGOidjf7F2xO6NBc4rf8/OO7/9mzte/b2FXn qTayCjeGP3rbs9AjTOFBrwIAtq0gPzMYrh4ju7ZnueCw4g2bgUA/gzZ0Hq38bSYoAE1Q1mCw Fz1TtW8ABNaWOHdiYFGLzw47WsA= X-Mailgun-Sending-Ip: 198.61.254.9 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-n02.prod.us-east-1.postgun.com with SMTP id 60b131c0ef99224c246824b2 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 28 May 2021 18:09:04 GMT Sender: khsieh=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 261EEC4338A; Fri, 28 May 2021 18:09:03 +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 60A5FC433F1; Fri, 28 May 2021 18:09:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 60A5FC433F1 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 v2] drm/msm/dp: power off DP phy bases on phy state at suspend Date: Fri, 28 May 2021 11:08:55 -0700 Message-Id: <1622225335-9875-1-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 add phy_power_off() at dp_ctrl_host_deinit() which is called by dp_pm_suspend() to power off phy according to the state of is_phy_on flag. Changes in V2: -- stashed changes into dp_ctrl.c -- add is_phy_on to monitor phy state Fixes: 0114f31a2903 ("drm/msm/dp: handle irq_hpd with sink_count = 0 correctly) Sgned-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index dbd8943..3924ac6 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -77,6 +77,8 @@ struct dp_ctrl_private { struct dp_parser *parser; struct dp_catalog *catalog; + bool is_phy_on; + struct opp_table *opp_table; struct completion idle_comp; @@ -1336,6 +1338,7 @@ static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl) phy_configure(phy, &dp_io->phy_opts); phy_power_on(phy); + ctrl->is_phy_on = true; ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, true); if (ret) @@ -1414,6 +1417,11 @@ void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl) phy = dp_io->phy; dp_catalog_ctrl_enable_irq(ctrl->catalog, false); + if (ctrl->is_phy_on) { + phy_power_off(phy); + ctrl->is_phy_on = false; + } + phy_exit(phy); DRM_DEBUG_DP("Host deinitialized successfully\n"); @@ -1457,6 +1465,8 @@ static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl) return ret; } phy_power_off(phy); + ctrl->is_phy_on = false; + /* hw recommended delay before re-enabling clocks */ msleep(20); @@ -1488,6 +1498,8 @@ static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl) } phy_power_off(phy); + ctrl->is_phy_on = false; + phy_exit(phy); return 0; @@ -1840,6 +1852,7 @@ int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl) } phy_power_off(phy); + ctrl->is_phy_on = false; /* aux channel down, reinit phy */ phy_exit(phy); @@ -1894,6 +1907,8 @@ int dp_ctrl_off(struct dp_ctrl *dp_ctrl) } phy_power_off(phy); + ctrl->is_phy_on = false; + phy_exit(phy); DRM_DEBUG_DP("DP off done\n"); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project