From patchwork Wed Apr 21 20:46:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12216999 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=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 42CBBC433ED for ; Wed, 21 Apr 2021 20:46:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E7A461435 for ; Wed, 21 Apr 2021 20:46:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245665AbhDUUrL (ORCPT ); Wed, 21 Apr 2021 16:47:11 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:20452 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245663AbhDUUrJ (ORCPT ); Wed, 21 Apr 2021 16:47:09 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1619037995; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=WMNzn12sp0I1xSRnusBjExFnrSaK6dKVV0yrk/rva9o=; b=lzo2ujKoWg/nXGuT2J3p2HkTMBGtXS1ZAyvTiVAinFn/0Q++Lo/pvit4mr1EVWlhYo9fFdOQ OmWK0b/qxDAu1AWvhWoTEMKeblw1zovUwUbhnOSTI9StvXjOPmjviiuTD82gh+BRZ7KeVveC iJxlmGhvcD0KRDGDAMEmZTUCaVU= X-Mailgun-Sending-Ip: 198.61.254.9 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-n01.prod.us-west-2.postgun.com with SMTP id 60808f15f34440a9d46888a8 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 21 Apr 2021 20:46:13 GMT Sender: khsieh=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id C4F13C4360C; Wed, 21 Apr 2021 20:46:12 +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 54E6CC4338A; Wed, 21 Apr 2021 20:46:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 54E6CC4338A 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 Cc: abhinavk@codeaurora.org, aravindh@codeaurora.org, khsieh@codeaurora.org, airlied@linux.ie, daniel@ffwll.ch, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] drm/msm/dp: service only one irq_hpd if there are multiple irq_hpd pending Date: Wed, 21 Apr 2021 13:46:04 -0700 Message-Id: <1619037964-26222-1-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 irq_hpd is an asynchronous event generated by panel to bring up attention of host. It could only be generated at run time of normal operation and it is not possible to be generated while main link is down. Therefore no need to handle irq_hpd if main link is down, such as cable unplug or system suspended. To handle irq_hpd, host has to read DPCD out of panel to figure out what action requested and perform that action accordingly. Also only handle the latest irq_hpd if there are multiple irq_hpd pending at the time of service since panel contains only the latest irq_hpd request status. Changes in v2: -- re wording of commit test Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_display.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 5a39da6..1107c4e 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -707,6 +707,12 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) return 0; } + /* + * handle only one irq_hpd in case of multiple irq_hpd pending + * since panel contains the lateset request at this time + */ + dp_del_event(dp, EV_IRQ_HPD_INT); + ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); if (ret == -ECONNRESET) { /* cable unplugged */ dp->core_initialized = false; @@ -1300,6 +1306,9 @@ static int dp_pm_suspend(struct device *dev) /* host_init will be called at pm_resume */ dp->core_initialized = false; + /* suspending, no need to handle pending irq_hdps */ + dp_del_event(dp, EV_IRQ_HPD_INT); + mutex_unlock(&dp->event_mutex); return 0; @@ -1496,6 +1505,9 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder) /* stop sentinel checking */ dp_del_event(dp_display, EV_DISCONNECT_PENDING_TIMEOUT); + /* link is teared down, no need to handle pending irq_hdps */ + dp_del_event(dp_display, EV_IRQ_HPD_INT); + dp_display_disable(dp_display, 0); rc = dp_display_unprepare(dp);