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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 BBAAEC43331 for ; Thu, 2 Apr 2020 07:18:13 +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 90B5C20784 for ; Thu, 2 Apr 2020 07:18:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="Pk0X3Ada" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90B5C20784 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 4DF116E9E0; Thu, 2 Apr 2020 07:18:00 +0000 (UTC) Received: from mail26.static.mailgun.info (mail26.static.mailgun.info [104.130.122.26]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4014B6E907 for ; Wed, 1 Apr 2020 09:32:28 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1585733551; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=O4mfO68j0oUFthZ8BDymyBRZQeDPJ5DqwOJdqb9xXjc=; b=Pk0X3Ada9U+D2p3ZzCfdTrUP5wfUktvxx1Ic3FPnYSOqqQusDj/+wecyDVfBs1Xip+SB7lNv 131MOWaMIXAxvGeePKZ2aYs6ef7JrXRINEPUpjiRHEMSHoIeDG5pUo8kx4puJ5L5UjyKW5vg /LJiSYpL6rBmCN2YvBA+lnVH5Vs= X-Mailgun-Sending-Ip: 104.130.122.26 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 mxa.mailgun.org with ESMTP id 5e845fa5.7ff7beefeed8-smtp-out-n05; Wed, 01 Apr 2020 09:32:21 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id C2A60C433F2; Wed, 1 Apr 2020 09:32:21 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: kalyan_t) by smtp.codeaurora.org (Postfix) with ESMTPSA id 16FF4C433D2; Wed, 1 Apr 2020 09:32:21 +0000 (UTC) MIME-Version: 1.0 Date: Wed, 01 Apr 2020 15:02:21 +0530 From: kalyan_t@codeaurora.org To: Doug Anderson Subject: Re: [PATCH] drm/msm/dpu: ensure device suspend happens during PM sleep In-Reply-To: References: <1585663107-12406-1-git-send-email-kalyan_t@codeaurora.org> Message-ID: <2922a0c64ec61c3d74d516e44dca2d71@codeaurora.org> X-Sender: kalyan_t@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 X-Mailman-Approved-At: Thu, 02 Apr 2020 07:17:56 +0000 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: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , mkrishn@codeaurora.org, linux-arm-msm , travitej@codeaurora.org, LKML , dri-devel , Sean Paul , "Kristian H. Kristensen" , freedreno Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 2020-03-31 21:30, Doug Anderson wrote: > Hi, > > On Tue, Mar 31, 2020 at 6:58 AM Kalyan Thota > wrote: >> >> "The PM core always increments the runtime usage counter >> before calling the ->suspend() callback and decrements it >> after calling the ->resume() callback" >> >> DPU and DSI are managed as runtime devices. When >> suspend is triggered, PM core adds a refcount on all the >> devices and calls device suspend, since usage count is >> already incremented, runtime suspend was not getting called >> and it kept the clocks on which resulted in target not >> entering into XO shutdown. >> >> Add changes to force suspend on runtime devices during pm sleep. >> >> Changes in v1: >> - Remove unnecessary checks in the function >> _dpu_kms_disable_dpu (Rob Clark). >> >> Changes in v2: >> - Avoid using suspend_late to reset the usagecount >> as suspend_late might not be called during suspend >> call failures (Doug). >> >> Changes in v3: >> - Use force suspend instead of managing device usage_count >> via runtime put and get API's to trigger callbacks (Doug). >> >> Signed-off-by: Kalyan Thota >> --- >> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 2 ++ >> drivers/gpu/drm/msm/dsi/dsi.c | 2 ++ >> drivers/gpu/drm/msm/msm_drv.c | 4 ++++ >> 3 files changed, 8 insertions(+) > > This looks much saner to me. Thanks! I assume it still works fine > for you? I'm still no expert on how all the pieces of DRM drivers > work together, but at least there's not a bunch of strange fiddling > with pm_runtime state and hopefully it will avoid weird corner > cases... > --- Yes, verified the change on trogdor device, and display can suspend with the change. > >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c >> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c >> index ce19f1d..b886d9d 100644 >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c >> @@ -1123,6 +1123,8 @@ static int __maybe_unused >> dpu_runtime_resume(struct device *dev) >> >> static const struct dev_pm_ops dpu_pm_ops = { >> SET_RUNTIME_PM_OPS(dpu_runtime_suspend, dpu_runtime_resume, >> NULL) >> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, >> + pm_runtime_force_resume) >> }; >> >> static const struct of_device_id dpu_dt_match[] = { >> diff --git a/drivers/gpu/drm/msm/dsi/dsi.c >> b/drivers/gpu/drm/msm/dsi/dsi.c >> index 55ea4bc2..62704885 100644 >> --- a/drivers/gpu/drm/msm/dsi/dsi.c >> +++ b/drivers/gpu/drm/msm/dsi/dsi.c >> @@ -161,6 +161,8 @@ static int dsi_dev_remove(struct platform_device >> *pdev) >> >> static const struct dev_pm_ops dsi_pm_ops = { >> SET_RUNTIME_PM_OPS(msm_dsi_runtime_suspend, >> msm_dsi_runtime_resume, NULL) >> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, >> + pm_runtime_force_resume) >> }; >> >> static struct platform_driver dsi_driver = { >> diff --git a/drivers/gpu/drm/msm/msm_drv.c >> b/drivers/gpu/drm/msm/msm_drv.c >> index 7d985f8..2b8c99c 100644 >> --- a/drivers/gpu/drm/msm/msm_drv.c >> +++ b/drivers/gpu/drm/msm/msm_drv.c >> @@ -1051,6 +1051,8 @@ static int msm_pm_suspend(struct device *dev) >> return ret; >> } >> >> + pm_runtime_force_suspend(dev); > > nit: check return value of pm_runtime_force_suspend()? > > >> + >> return 0; >> } >> >> @@ -1063,6 +1065,8 @@ static int msm_pm_resume(struct device *dev) >> if (WARN_ON(!priv->pm_state)) >> return -ENOENT; >> >> + pm_runtime_force_resume(dev); > > nit: check return value of pm_runtime_force_resume()? > > > -Doug _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel