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=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 6DA2EC43331 for ; Sun, 10 Nov 2019 13:53:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 283712085B for ; Sun, 10 Nov 2019 13:53:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=onstation.org header.i=@onstation.org header.b="JgFPNM+f" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726561AbfKJNxX (ORCPT ); Sun, 10 Nov 2019 08:53:23 -0500 Received: from onstation.org ([52.200.56.107]:41736 "EHLO onstation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726436AbfKJNxX (ORCPT ); Sun, 10 Nov 2019 08:53:23 -0500 Received: from localhost (c-98-239-145-235.hsd1.wv.comcast.net [98.239.145.235]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: masneyb) by onstation.org (Postfix) with ESMTPSA id DCE553E953; Sun, 10 Nov 2019 13:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=onstation.org; s=default; t=1573394002; bh=kwwxYsI+7PWQmNARlHVg5LcR+LYdXJkJFNO4dbdDESA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=JgFPNM+fUNVENhg2ZYTapQmtDnzIIl7vBGSW5GDy0L3LsG9HN7TfjET4vdnWrU6Ca HAYEjwBYKBbSj305ZPtTH5TnB3u3/AGrlQDusOe9c3LvCyAqoT27I39BCi9V7yDoLi glX6i8b8HNJsP9BCbsT+xu8PSu/pkoWvsUIWXfrY= Date: Sun, 10 Nov 2019 08:53:21 -0500 From: Brian Masney To: Jeffrey Hugo Cc: Rob Clark , Rob Clark , freedreno , Linux Kernel Mailing List , dri-devel , linux-arm-msm , Sean Paul Subject: Re: [Freedreno] drm/msm: 'pp done time out' errors after async commit changes Message-ID: <20191110135321.GA6728@onstation.org> References: <20191106091335.GA16729@onstation.org> <20191107111019.GA24028@onstation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Fri, Nov 08, 2019 at 07:56:25AM -0700, Jeffrey Hugo wrote: > On Thu, Nov 7, 2019 at 7:03 PM Rob Clark wrote: > > > > On Thu, Nov 7, 2019 at 9:40 AM Jeffrey Hugo wrote: > > > > > > On Thu, Nov 7, 2019 at 9:17 AM Rob Clark wrote: > > > > > > > > On Thu, Nov 7, 2019 at 3:10 AM Brian Masney wrote: > > > > > > > > > > On Wed, Nov 06, 2019 at 08:58:59AM -0800, Rob Clark wrote: > > > > > > On Wed, Nov 6, 2019 at 8:47 AM Jeffrey Hugo wrote: > > > > > > > > > > > > > > On Wed, Nov 6, 2019 at 9:30 AM Rob Clark wrote: > > > > > > > > > > > > > > > > On Wed, Nov 6, 2019 at 1:13 AM Brian Masney wrote: > > > > > > > > > > > > > > > > > > On Tue, Nov 05, 2019 at 08:23:27AM -0800, Rob Clark wrote: > > > > > > > > > > On Tue, Nov 5, 2019 at 2:08 AM Brian Masney wrote: > > > > > > > > > > > The 'pp done time out' errors go away if I revert the following three > > > > > > > > > > > commits: > > > > > > > > > > > > > > > > > > > > > > cd6d923167b1 ("drm/msm/dpu: async commit support") > > > > > > > > > > > d934a712c5e6 ("drm/msm: add atomic traces") > > > > > > > > > > > 2d99ced787e3 ("drm/msm: async commit support") > > > > > > > > > > > > > > > > > > > > > > I reverted the first one to fix a compiler error, and the second one so > > > > > > > > > > > that the last patch can be reverted without any merge conflicts. > > > > > > > > > > > > > > > > > > > > > > I see that crtc_flush() calls mdp5_ctl_commit(). I tried to use > > > > > > > > > > > crtc_flush_all() in mdp5_flush_commit() and the contents of the frame > > > > > > > > > > > buffer dance around the screen like its out of sync. I renamed > > > > > > > > > > > crtc_flush_all() to mdp5_crtc_flush_all() and removed the static > > > > > > > > > > > declaration. Here's the relevant part of what I tried: > > > > > > > > > > > > > > > > > > > > > > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c > > > > > > > > > > > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c > > > > > > > > > > > @@ -171,7 +171,15 @@ static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *st > > > > > > > > > > > > > > > > > > > > > > static void mdp5_flush_commit(struct msm_kms *kms, unsigned crtc_mask) > > > > > > > > > > > { > > > > > > > > > > > - /* TODO */ > > > > > > > > > > > + struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms)); > > > > > > > > > > > + struct drm_crtc *crtc; > > > > > > > > > > > + > > > > > > > > > > > + for_each_crtc_mask(mdp5_kms->dev, crtc, crtc_mask) { > > > > > > > > > > > + if (!crtc->state->active) > > > > > > > > > > > + continue; > > > > > > > > > > > + > > > > > > > > > > > + mdp5_crtc_flush_all(crtc); > > > > > > > > > > > + } > > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > > > Any tips would be appreciated. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > I think this is along the lines of what we need to enable async commit > > > > > > > > > > for mdp5 (but also removing the flush from the atomic-commit path).. > > > > > > > > > > the principle behind the async commit is to do all the atomic state > > > > > > > > > > commit normally, but defer writing the flush bits. This way, if you > > > > > > > > > > get another async update before the next vblank, you just apply it > > > > > > > > > > immediately instead of waiting for vblank. > > > > > > > > > > > > > > > > > > > > But I guess you are on a command mode panel, if I remember? Which is > > > > > > > > > > a case I didn't have a way to test. And I'm not entirely about how > > > > > > > > > > kms_funcs->vsync_time() should be implemented for cmd mode panels. > > > > > > > > > > > > > > > > > > Yes, this is a command-mode panel and there's no hardware frame counter > > > > > > > > > available. The key to getting the display working on this phone was this > > > > > > > > > patch: > > > > > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2bab52af6fe68c43b327a57e5ce5fc10eefdfadf > > > > > > > > > > > > > > > > > > > That all said, I think we should first fix what is broken, before > > > > > > > > > > worrying about extending async commit support to mdp5.. which > > > > > > > > > > shouldn't hit the async==true path, due to not implementing > > > > > > > > > > kms_funcs->vsync_time(). > > > > > > > > > > > > > > > > > > > > What I think is going on is that, in the cmd mode case, > > > > > > > > > > mdp5_wait_flush() (indirectly) calls mdp5_crtc_wait_for_pp_done(), > > > > > > > > > > which waits for a pp-done irq regardless of whether there is a flush > > > > > > > > > > in progress. Since there is no flush pending, the irq never comes. > > > > > > > > > > But the expectation is that kms_funcs->wait_flush() returns > > > > > > > > > > immediately if there is nothing to wait for. > > > > > > > > > > > > > > > > > > I don't think that's happening in this case. I added some pr_info() > > > > > > > > > statements to request_pp_done_pending() and mdp5_crtc_pp_done_irq(). > > > > > > > > > Here's the first two sets of messages that appear in dmesg: > > > > > > > > > > > > > > > > > > [ 14.018907] msm fd900000.mdss: pp done time out, lm=0 > > > > > > > > > [ 14.018993] request_pp_done_pending: HERE > > > > > > > > > [ 14.074208] mdp5_crtc_pp_done_irq: HERE > > > > > > > > > [ 14.074368] Console: switching to colour frame buffer device 135x120 > > > > > > > > > [ 14.138938] msm fd900000.mdss: pp done time out, lm=0 > > > > > > > > > [ 14.139021] request_pp_done_pending: HERE > > > > > > > > > [ 14.158097] mdp5_crtc_pp_done_irq: HERE > > > > > > > > > > > > > > > > > > The messages go on like this with the same pattern. > > > > > > > > > > > > > > > > > > I tried two different changes: > > > > > > > > > > > > > > > > > > 1) I moved the request_pp_done_pending() and corresponding if statement > > > > > > > > > from mdp5_crtc_atomic_flush() and into mdp5_crtc_atomic_begin(). > > > > > > > > > > > > > > > > > > 2) I increased the timeout in wait_for_completion_timeout() by several > > > > > > > > > increments; all the way to 5 seconds. > > > > > > > > > > > > > > > > increasing the timeout won't help, because the pp-done irq has already > > > > > > > > come at the point where we wait for it.. > > > > > > > > > > > > > > > > maybe the easy thing is just add mdp5_crtc->needs_pp, set to true > > > > > > > > before requesting, and false when we get the irq.. and then > > > > > > > > mdp5_crtc_wait_for_pp_done() just returns if needs_pp==false.. > > > > > > > > > > > > > > On the otherhand, what about trying to make command mode panels > > > > > > > resemble video mode panels slightly? Video mode panels have a vsync > > > > > > > counter in hardware, which is missing from command mode - however it > > > > > > > seems like the driver/drm framework would prefer such a counter. > > > > > > > Would it be a reasonable idea to make a software counter, and just > > > > > > > increment it every time the pp_done irq is triggered? > > > > > > > > > > > > > > I'm just thinking that we'll avoid issues long term by trying to make > > > > > > > the code common, rather than diverging it for the two modes. > > > > > > > > > > > > > > > > > > > *possibly*, but I think we want to account somehow periods where > > > > > > display is not updated. > > > > > > > > > > > > fwiw, it isn't that uncommon for userspace to use vblanks to "keep > > > > > > time" (drive animations for desktop switch, window > > > > > > maximize/unmaximize, etc).. it could be a surprise when "vblank" is > > > > > > not periodic. > > > > > > > > > > What do you think about using some variation of the current value of > > > > > jiffies in the kernel + the number of pp_done IRQs as the software > > > > > counter for command-mode panels? > > > > > > > > > > > > > jiffies is probably too coarse.. but we could use monotonic clock, I guess. > > > > > > > > But I suppose even a cmd mode panel has a "vblank", it is just > > > > internal the panel. Do we get the TE interrupt at regular intervals? > > > > AFAIU this would be tied to the panel's internal vblank. > > > > > > The TE interrupt was first implemented in MDP 1.7.0 (msm8996). 8974 > > > predates that. > > > You can get it from the WR_PTR interrupt, but you have to understand > > > details about your panel to configure that correctly. > > > > oh, sad.. I kinda assumed it was a pretty common DSI irq since > > forever.. I guess the hw is just managing the flow control to prevent > > tearing? > > > > Well, anyways, I guess we could just use a free-running timer based on > > refresh rate of the panel? > > That would work. One more alternative (just want to make sure we've > evaluated all options) is to use the autorefresh feature. How I would > put it simply, is that autorefresh turns a command mode panel into a > video mode panel. If autorefresh is enabled, the MDP will > automatically send a frame to the panel every time the panel invokes > the TE signal. I'm pretty sure this will automatically trigger the > PP_DONE irq, so essentially PP_DONE is now analogous to vsync. The > downside is that the START trigger and autorefresh are basically > mutually exclusive. I see the autorefresh config register in MDP 1.0, > so it would be applicable to all platforms supported by the mdp5 > driver. There's a REG_MDP5_PP_AUTOREFRESH_CONFIG() macro upstream here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/msm/disp/mdp5/mdp5.xml.h#n1383 I'm not sure what to put in that register but I tried configuring it with a 1 this way and still have the same issue. diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c index eeef41fcd4e1..6b9acf68fd2c 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c @@ -80,6 +80,7 @@ static int pingpong_tearcheck_setup(struct drm_encoder *encoder, mdp5_write(mdp5_kms, REG_MDP5_PP_SYNC_THRESH(pp_id), MDP5_PP_SYNC_THRESH_START(4) | MDP5_PP_SYNC_THRESH_CONTINUE(4)); + mdp5_write(mdp5_kms, REG_MDP5_PP_AUTOREFRESH_CONFIG(pp_id), 1); return 0; } Brian From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Masney Subject: Re: drm/msm: 'pp done time out' errors after async commit changes Date: Sun, 10 Nov 2019 08:53:21 -0500 Message-ID: <20191110135321.GA6728@onstation.org> References: <20191106091335.GA16729@onstation.org> <20191107111019.GA24028@onstation.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: freedreno-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Freedreno" To: Jeffrey Hugo Cc: Rob Clark , linux-arm-msm , Linux Kernel Mailing List , dri-devel , Sean Paul , Rob Clark , freedreno List-Id: dri-devel@lists.freedesktop.org T24gRnJpLCBOb3YgMDgsIDIwMTkgYXQgMDc6NTY6MjVBTSAtMDcwMCwgSmVmZnJleSBIdWdvIHdy b3RlOgo+IE9uIFRodSwgTm92IDcsIDIwMTkgYXQgNzowMyBQTSBSb2IgQ2xhcmsgPHJvYmRjbGFy a0BjaHJvbWl1bS5vcmc+IHdyb3RlOgo+ID4KPiA+IE9uIFRodSwgTm92IDcsIDIwMTkgYXQgOTo0 MCBBTSBKZWZmcmV5IEh1Z28gPGplZmZyZXkubC5odWdvQGdtYWlsLmNvbT4gd3JvdGU6Cj4gPiA+ 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header.from=onstation.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 074946E0E2; Mon, 11 Nov 2019 02:29:26 +0000 (UTC) Received: from onstation.org (onstation.org [52.200.56.107]) by gabe.freedesktop.org (Postfix) with ESMTPS id 40D136E620; Sun, 10 Nov 2019 13:53:24 +0000 (UTC) Received: from localhost (c-98-239-145-235.hsd1.wv.comcast.net [98.239.145.235]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: masneyb) by onstation.org (Postfix) with ESMTPSA id DCE553E953; Sun, 10 Nov 2019 13:53:21 +0000 (UTC) Date: Sun, 10 Nov 2019 08:53:21 -0500 From: Brian Masney To: Jeffrey Hugo Subject: Re: [Freedreno] drm/msm: 'pp done time out' errors after async commit changes Message-ID: <20191110135321.GA6728@onstation.org> References: 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