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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 089F9C433DF for ; Thu, 21 May 2020 15:23:10 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 BF211207D8 for ; Thu, 21 May 2020 15:23:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="rybeDlKL"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="jO1m0/v5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF211207D8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=jiJ7n3sNomHwaUwZrcWRBdk042wK8pplvcHXwaGZ/Qc=; b=rybeDlKL6snJJ5 dS2PTgSNulOloMqJ4etCmAT5Rw8VvQqsVlDSplWBulKdTKpuSonS91hmcBcDbo/fng2M3XHwJvzC3 y8ziQ7DR97o91lp0OzorKCcBjAWSe1r06rrTYtx94NIud9CIIPOll2ozG7R8RRsy9QahB68uTNusC xBSJVOMkcGyFJVMgj/8HZRt0wCujsxCKEDYNqhRTGTKfjAyTw8I4nHZ+cxTltakb1w0fFKA4B7MgB lZEnIR57iQ1nUvkYRnIPr3WClC7eyRRCsEFKJoFS6D92u13+WsgGa1NFH0V9Xg+KOZ0C5TnNGn0WL Wj/KBb0Rgb+zzYQR2HAA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbn2B-0003wG-HJ; Thu, 21 May 2020 15:22:59 +0000 Received: from mail-wm1-x342.google.com ([2a00:1450:4864:20::342]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbn28-0003vB-MM for linux-mediatek@lists.infradead.org; Thu, 21 May 2020 15:22:58 +0000 Received: by mail-wm1-x342.google.com with SMTP id f13so5877373wmc.5 for ; Thu, 21 May 2020 08:22:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=BAKLcpITx/3kGgWTBYxDEZTohF/5xKJj7rJDCLE80Zo=; b=jO1m0/v5PI18i/EX4FCyeJ0cr5KPOWycKpGnRQGN0bSwCpxt8XWGDKkwubaWb0doVL QFggHPhQuapuwFk2GcAO/sFU/5KXmx6tmurSe+maOk6IxIvLE1mzL7tSB5gKF1y76rqk 6N5xVsZYZakqqegyFos4roVrtKTae2J8IVQO8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=BAKLcpITx/3kGgWTBYxDEZTohF/5xKJj7rJDCLE80Zo=; b=jjt9DBCBhpX+kxknaYoLcQ39O+NSeVH40vbEh+QD2pGuef+1qodmdCwQbZq63GdbIB OZLaHl8ouMNes3TpfFOxBjGyrT+67NugY8KiDXx82D6iMkzghxLzp81/3WBUcI5HMX+7 xj8abNFozQHXDlFHRnUNsXVqFToW+eXaSwEeUQsAQZyTTMqk2ppVUrRS7YgnNBWWahQH 8zmMpOEbidQrO//quufJIPraZIK8rcxd1F1bOg/xzeszhzk3rfx5l9R/YfaCGVfG5Bt9 pNNcaNLAiAIKaPI0WD1YUROyOszHsw5okiQThoihloQ1rr0h5NND07Uj/9l4F8Vvb813 c2AA== X-Gm-Message-State: AOAM532o/5vFwt2f/yeDMp72/xaWPNbrWT5kR8ZgFrjTgCbu4X204Zg2 4z4rILiefj8iAXYgk8EfSrnQLg== X-Google-Smtp-Source: ABdhPJwMue+mt+thE6n7MP8xM0aOjfshOU4d1sP9ElGBs9Eu1VhZydaalBi9QV0v2+BvJeu8Riv4sg== X-Received: by 2002:a1c:a74a:: with SMTP id q71mr9177584wme.23.1590074575192; Thu, 21 May 2020 08:22:55 -0700 (PDT) Received: from chromium.org (205.215.190.35.bc.googleusercontent.com. [35.190.215.205]) by smtp.gmail.com with ESMTPSA id j190sm7073152wmb.33.2020.05.21.08.22.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 08:22:54 -0700 (PDT) Date: Thu, 21 May 2020 15:22:53 +0000 From: Tomasz Figa To: Xia Jiang Subject: Re: [PATCH v8 05/14] media: platform: Improve power on and power off flow Message-ID: <20200521152253.GE209565@chromium.org> References: <20200403094033.8288-1-xia.jiang@mediatek.com> <20200403094033.8288-6-xia.jiang@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200403094033.8288-6-xia.jiang@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200521_082256_745310_5779BD1D X-CRM114-Status: GOOD ( 16.73 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: drinkcat@chromium.org, devicetree@vger.kernel.org, mojahsu@chromium.org, srv_heupstream@mediatek.com, Rick Chang , senozhatsky@chromium.org, linux-kernel@vger.kernel.org, maoguang.meng@mediatek.com, Mauro Carvalho Chehab , sj.huang@mediatek.com, Rob Herring , Matthias Brugger , Hans Verkuil , linux-mediatek@lists.infradead.org, Marek Szyprowski , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Hi Xia, On Fri, Apr 03, 2020 at 05:40:24PM +0800, Xia Jiang wrote: > Call pm_runtime_get_sync() before starting a frame and then > pm_runtime_put() after completing it. This can save power for the time > between processing two frames. > > Signed-off-by: Xia Jiang > --- > .../media/platform/mtk-jpeg/mtk_jpeg_core.c | 27 +++++-------------- > 1 file changed, 6 insertions(+), 21 deletions(-) > Thank you for the patch. Please see my comments inline. > diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > index a536fa95b3d6..dd5cadd101ef 100644 > --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > @@ -710,23 +710,6 @@ static struct vb2_v4l2_buffer *mtk_jpeg_buf_remove(struct mtk_jpeg_ctx *ctx, > return v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); > } > > -static int mtk_jpeg_start_streaming(struct vb2_queue *q, unsigned int count) > -{ > - struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q); > - struct vb2_v4l2_buffer *vb; > - int ret = 0; > - > - ret = pm_runtime_get_sync(ctx->jpeg->dev); > - if (ret < 0) > - goto err; > - > - return 0; > -err: > - while ((vb = mtk_jpeg_buf_remove(ctx, q->type))) > - v4l2_m2m_buf_done(vb, VB2_BUF_STATE_QUEUED); > - return ret; > -} > - > static void mtk_jpeg_stop_streaming(struct vb2_queue *q) > { > struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q); > @@ -751,8 +734,6 @@ static void mtk_jpeg_stop_streaming(struct vb2_queue *q) > > while ((vb = mtk_jpeg_buf_remove(ctx, q->type))) > v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR); > - > - pm_runtime_put_sync(ctx->jpeg->dev); > } > > static const struct vb2_ops mtk_jpeg_qops = { > @@ -761,7 +742,6 @@ static const struct vb2_ops mtk_jpeg_qops = { > .buf_queue = mtk_jpeg_buf_queue, > .wait_prepare = vb2_ops_wait_prepare, > .wait_finish = vb2_ops_wait_finish, > - .start_streaming = mtk_jpeg_start_streaming, > .stop_streaming = mtk_jpeg_stop_streaming, > }; > > @@ -812,7 +792,7 @@ static void mtk_jpeg_device_run(void *priv) > struct mtk_jpeg_src_buf *jpeg_src_buf; > struct mtk_jpeg_bs bs; > struct mtk_jpeg_fb fb; > - int i; > + int i, ret; > > src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); > dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); > @@ -832,6 +812,10 @@ static void mtk_jpeg_device_run(void *priv) > return; > } > > + ret = pm_runtime_get_sync(jpeg->dev); > + if (ret < 0) > + goto dec_end; > + > mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs); > if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb)) > goto dec_end; > @@ -957,6 +941,7 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv) > v4l2_m2m_buf_done(src_buf, buf_state); > v4l2_m2m_buf_done(dst_buf, buf_state); > v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx); > + pm_runtime_put_sync(ctx->jpeg->dev); The _sync variant explicitly waits until the asynchronous PM operation completes. This is usually undesired, because the CPU stays blocked for no good reason. In this context it is actually a bug, because this is an interrupt handler and it's not allowed to sleep. I wonder why this actually didn't crash in your testing. Please change to the regular pm_runtime_put(). Best regards, Tomasz _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 2B5AFC433E0 for ; Thu, 21 May 2020 15:23:07 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 BD4AC207D8 for ; Thu, 21 May 2020 15:23:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="qBzBz3sp"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="jO1m0/v5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BD4AC207D8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=t1d5VB0xiTURbxKAthLxJvLRhvgy7LgwSiHxGWQL5Bw=; b=qBzBz3spxaXvqN R7WN7IWupvDJItmMBBUh1SunKN9RW305IER2POiRtu+7CjR97bFxEl1zZY1iXJKtFgeu8UJryzO6J kXzveu69Pm7CcYuZdpnyn/zBvLDFkjX+bhNUhMniqLoLS8gRCVWyBJWxqHsG2lq7J1PhEbZOXtIm8 678oGxYuFgwxays0jrTyIUfEwCpGmBGYB/PNGo23umk3gjuN1RL7GXNERa9WH6Hj8fnrZkjbKKA3l YwGmcm/fBns/hm6k6wNq39ltB/4z5yjmq8mKXsoXC4Hvk1uU0Z9EEhzW1Lq572+4XB8UcRoTltgPS HJcrEjzWKHcoViFwlf8A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbn2E-0003xy-P9; Thu, 21 May 2020 15:23:02 +0000 Received: from mail-wm1-x343.google.com ([2a00:1450:4864:20::343]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbn2B-0003vA-Ae for linux-arm-kernel@lists.infradead.org; Thu, 21 May 2020 15:23:00 +0000 Received: by mail-wm1-x343.google.com with SMTP id z4so5895818wmi.2 for ; Thu, 21 May 2020 08:22:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=BAKLcpITx/3kGgWTBYxDEZTohF/5xKJj7rJDCLE80Zo=; b=jO1m0/v5PI18i/EX4FCyeJ0cr5KPOWycKpGnRQGN0bSwCpxt8XWGDKkwubaWb0doVL QFggHPhQuapuwFk2GcAO/sFU/5KXmx6tmurSe+maOk6IxIvLE1mzL7tSB5gKF1y76rqk 6N5xVsZYZakqqegyFos4roVrtKTae2J8IVQO8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=BAKLcpITx/3kGgWTBYxDEZTohF/5xKJj7rJDCLE80Zo=; b=Y/HjfCsTwmYuZ5Nhx6bpClYTQLU6mjKXCzOuxkrphUv92v2M1aTM/RKAcitfgA0uVt hEqFsQpyIFHt2Ll762pDqU1KpwgejEXitfh1aDmQlfvQIZh3mM/g0m/rkECWLlNHqDKk aFWMTFmt8bO9Kbw0bdKSva+F6XH1aW1V5s1tL2AQaX/dmA0epa2egjvGz6qXkYOEqUor UrKLCBsjadgC5PWKqJfjeGDeUvtXjyjJrzb518CpKxe735bl3fWB4RnZW6YUWZ0ewVyy 62T0S7EdpmyGX9rR5PBfkhNo4vsFatqButF7oZAFtReD1ebFFD661J1PgocfHA0S9taP kZbA== X-Gm-Message-State: AOAM5306tKDBF5Qo55C+v0hXfw0Iack3XUivjefw475naJ0r5kKTEk3r QwiRz1FC/GBGOs2VVxJWX0HCJA== X-Google-Smtp-Source: ABdhPJwMue+mt+thE6n7MP8xM0aOjfshOU4d1sP9ElGBs9Eu1VhZydaalBi9QV0v2+BvJeu8Riv4sg== X-Received: by 2002:a1c:a74a:: with SMTP id q71mr9177584wme.23.1590074575192; Thu, 21 May 2020 08:22:55 -0700 (PDT) Received: from chromium.org (205.215.190.35.bc.googleusercontent.com. [35.190.215.205]) by smtp.gmail.com with ESMTPSA id j190sm7073152wmb.33.2020.05.21.08.22.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 08:22:54 -0700 (PDT) Date: Thu, 21 May 2020 15:22:53 +0000 From: Tomasz Figa To: Xia Jiang Subject: Re: [PATCH v8 05/14] media: platform: Improve power on and power off flow Message-ID: <20200521152253.GE209565@chromium.org> References: <20200403094033.8288-1-xia.jiang@mediatek.com> <20200403094033.8288-6-xia.jiang@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200403094033.8288-6-xia.jiang@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200521_082259_375608_1A56C29B X-CRM114-Status: GOOD ( 18.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: drinkcat@chromium.org, devicetree@vger.kernel.org, mojahsu@chromium.org, srv_heupstream@mediatek.com, Rick Chang , senozhatsky@chromium.org, linux-kernel@vger.kernel.org, maoguang.meng@mediatek.com, Mauro Carvalho Chehab , sj.huang@mediatek.com, Rob Herring , Matthias Brugger , Hans Verkuil , linux-mediatek@lists.infradead.org, Marek Szyprowski , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Xia, On Fri, Apr 03, 2020 at 05:40:24PM +0800, Xia Jiang wrote: > Call pm_runtime_get_sync() before starting a frame and then > pm_runtime_put() after completing it. This can save power for the time > between processing two frames. > > Signed-off-by: Xia Jiang > --- > .../media/platform/mtk-jpeg/mtk_jpeg_core.c | 27 +++++-------------- > 1 file changed, 6 insertions(+), 21 deletions(-) > Thank you for the patch. Please see my comments inline. > diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > index a536fa95b3d6..dd5cadd101ef 100644 > --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > @@ -710,23 +710,6 @@ static struct vb2_v4l2_buffer *mtk_jpeg_buf_remove(struct mtk_jpeg_ctx *ctx, > return v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); > } > > -static int mtk_jpeg_start_streaming(struct vb2_queue *q, unsigned int count) > -{ > - struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q); > - struct vb2_v4l2_buffer *vb; > - int ret = 0; > - > - ret = pm_runtime_get_sync(ctx->jpeg->dev); > - if (ret < 0) > - goto err; > - > - return 0; > -err: > - while ((vb = mtk_jpeg_buf_remove(ctx, q->type))) > - v4l2_m2m_buf_done(vb, VB2_BUF_STATE_QUEUED); > - return ret; > -} > - > static void mtk_jpeg_stop_streaming(struct vb2_queue *q) > { > struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q); > @@ -751,8 +734,6 @@ static void mtk_jpeg_stop_streaming(struct vb2_queue *q) > > while ((vb = mtk_jpeg_buf_remove(ctx, q->type))) > v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR); > - > - pm_runtime_put_sync(ctx->jpeg->dev); > } > > static const struct vb2_ops mtk_jpeg_qops = { > @@ -761,7 +742,6 @@ static const struct vb2_ops mtk_jpeg_qops = { > .buf_queue = mtk_jpeg_buf_queue, > .wait_prepare = vb2_ops_wait_prepare, > .wait_finish = vb2_ops_wait_finish, > - .start_streaming = mtk_jpeg_start_streaming, > .stop_streaming = mtk_jpeg_stop_streaming, > }; > > @@ -812,7 +792,7 @@ static void mtk_jpeg_device_run(void *priv) > struct mtk_jpeg_src_buf *jpeg_src_buf; > struct mtk_jpeg_bs bs; > struct mtk_jpeg_fb fb; > - int i; > + int i, ret; > > src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); > dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); > @@ -832,6 +812,10 @@ static void mtk_jpeg_device_run(void *priv) > return; > } > > + ret = pm_runtime_get_sync(jpeg->dev); > + if (ret < 0) > + goto dec_end; > + > mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs); > if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb)) > goto dec_end; > @@ -957,6 +941,7 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv) > v4l2_m2m_buf_done(src_buf, buf_state); > v4l2_m2m_buf_done(dst_buf, buf_state); > v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx); > + pm_runtime_put_sync(ctx->jpeg->dev); The _sync variant explicitly waits until the asynchronous PM operation completes. This is usually undesired, because the CPU stays blocked for no good reason. In this context it is actually a bug, because this is an interrupt handler and it's not allowed to sleep. I wonder why this actually didn't crash in your testing. Please change to the regular pm_runtime_put(). Best regards, Tomasz _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 A0B93C433DF for ; Thu, 21 May 2020 15:22:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7CB7A207D8 for ; Thu, 21 May 2020 15:22:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="jO1m0/v5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729982AbgEUPW6 (ORCPT ); Thu, 21 May 2020 11:22:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727898AbgEUPW6 (ORCPT ); Thu, 21 May 2020 11:22:58 -0400 Received: from mail-wm1-x343.google.com (mail-wm1-x343.google.com [IPv6:2a00:1450:4864:20::343]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B51EC05BD43 for ; Thu, 21 May 2020 08:22:56 -0700 (PDT) Received: by mail-wm1-x343.google.com with SMTP id u188so6764870wmu.1 for ; Thu, 21 May 2020 08:22:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=BAKLcpITx/3kGgWTBYxDEZTohF/5xKJj7rJDCLE80Zo=; b=jO1m0/v5PI18i/EX4FCyeJ0cr5KPOWycKpGnRQGN0bSwCpxt8XWGDKkwubaWb0doVL QFggHPhQuapuwFk2GcAO/sFU/5KXmx6tmurSe+maOk6IxIvLE1mzL7tSB5gKF1y76rqk 6N5xVsZYZakqqegyFos4roVrtKTae2J8IVQO8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=BAKLcpITx/3kGgWTBYxDEZTohF/5xKJj7rJDCLE80Zo=; b=QbCv9eQFEcT3MJ56NmggrHtizh0emKAMouOajpBs96V3ucw+gj8NxZMOjweRcaTYfw nk7QnWzsVdgqDp9YWRMguZc1RTZGMD8CR61ejXUurNsECJ/KAidIQgfUvad4FrNABwEk 0RS+RttTrA5L8W+i/7aBN6RD1h3eSidl2l4BaSeFlhuTG2msj/DWFUFlRpsnI+mJwWgR +U0dtEU+6BLHN2oJG86hQM7aaDpm3dcKiAw+4tA8o65xlHfOlSNT+VIdF6271Y80zeW8 xCrvZ5RDjsO7Nd6YAH55iIxMwh0e/mFJbl/Z24ZRRWILLakNDvTnfmcDTJNURQuFVlv1 CoKA== X-Gm-Message-State: AOAM533rasZNRWTTDOfttO2r3vWVlOz3ajMfCPxIPG/lp7bFfUxFke+j NMnDKrGQ2K5V5WNQ3SQ/b/W4Eg== X-Google-Smtp-Source: ABdhPJwMue+mt+thE6n7MP8xM0aOjfshOU4d1sP9ElGBs9Eu1VhZydaalBi9QV0v2+BvJeu8Riv4sg== X-Received: by 2002:a1c:a74a:: with SMTP id q71mr9177584wme.23.1590074575192; Thu, 21 May 2020 08:22:55 -0700 (PDT) Received: from chromium.org (205.215.190.35.bc.googleusercontent.com. [35.190.215.205]) by smtp.gmail.com with ESMTPSA id j190sm7073152wmb.33.2020.05.21.08.22.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 08:22:54 -0700 (PDT) Date: Thu, 21 May 2020 15:22:53 +0000 From: Tomasz Figa To: Xia Jiang Cc: Hans Verkuil , Mauro Carvalho Chehab , Rob Herring , Matthias Brugger , Rick Chang , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Marek Szyprowski , srv_heupstream@mediatek.com, senozhatsky@chromium.org, mojahsu@chromium.org, drinkcat@chromium.org, maoguang.meng@mediatek.com, sj.huang@mediatek.com Subject: Re: [PATCH v8 05/14] media: platform: Improve power on and power off flow Message-ID: <20200521152253.GE209565@chromium.org> References: <20200403094033.8288-1-xia.jiang@mediatek.com> <20200403094033.8288-6-xia.jiang@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200403094033.8288-6-xia.jiang@mediatek.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hi Xia, On Fri, Apr 03, 2020 at 05:40:24PM +0800, Xia Jiang wrote: > Call pm_runtime_get_sync() before starting a frame and then > pm_runtime_put() after completing it. This can save power for the time > between processing two frames. > > Signed-off-by: Xia Jiang > --- > .../media/platform/mtk-jpeg/mtk_jpeg_core.c | 27 +++++-------------- > 1 file changed, 6 insertions(+), 21 deletions(-) > Thank you for the patch. Please see my comments inline. > diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > index a536fa95b3d6..dd5cadd101ef 100644 > --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > @@ -710,23 +710,6 @@ static struct vb2_v4l2_buffer *mtk_jpeg_buf_remove(struct mtk_jpeg_ctx *ctx, > return v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); > } > > -static int mtk_jpeg_start_streaming(struct vb2_queue *q, unsigned int count) > -{ > - struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q); > - struct vb2_v4l2_buffer *vb; > - int ret = 0; > - > - ret = pm_runtime_get_sync(ctx->jpeg->dev); > - if (ret < 0) > - goto err; > - > - return 0; > -err: > - while ((vb = mtk_jpeg_buf_remove(ctx, q->type))) > - v4l2_m2m_buf_done(vb, VB2_BUF_STATE_QUEUED); > - return ret; > -} > - > static void mtk_jpeg_stop_streaming(struct vb2_queue *q) > { > struct mtk_jpeg_ctx *ctx = vb2_get_drv_priv(q); > @@ -751,8 +734,6 @@ static void mtk_jpeg_stop_streaming(struct vb2_queue *q) > > while ((vb = mtk_jpeg_buf_remove(ctx, q->type))) > v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR); > - > - pm_runtime_put_sync(ctx->jpeg->dev); > } > > static const struct vb2_ops mtk_jpeg_qops = { > @@ -761,7 +742,6 @@ static const struct vb2_ops mtk_jpeg_qops = { > .buf_queue = mtk_jpeg_buf_queue, > .wait_prepare = vb2_ops_wait_prepare, > .wait_finish = vb2_ops_wait_finish, > - .start_streaming = mtk_jpeg_start_streaming, > .stop_streaming = mtk_jpeg_stop_streaming, > }; > > @@ -812,7 +792,7 @@ static void mtk_jpeg_device_run(void *priv) > struct mtk_jpeg_src_buf *jpeg_src_buf; > struct mtk_jpeg_bs bs; > struct mtk_jpeg_fb fb; > - int i; > + int i, ret; > > src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx); > dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx); > @@ -832,6 +812,10 @@ static void mtk_jpeg_device_run(void *priv) > return; > } > > + ret = pm_runtime_get_sync(jpeg->dev); > + if (ret < 0) > + goto dec_end; > + > mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs); > if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb)) > goto dec_end; > @@ -957,6 +941,7 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv) > v4l2_m2m_buf_done(src_buf, buf_state); > v4l2_m2m_buf_done(dst_buf, buf_state); > v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx); > + pm_runtime_put_sync(ctx->jpeg->dev); The _sync variant explicitly waits until the asynchronous PM operation completes. This is usually undesired, because the CPU stays blocked for no good reason. In this context it is actually a bug, because this is an interrupt handler and it's not allowed to sleep. I wonder why this actually didn't crash in your testing. Please change to the regular pm_runtime_put(). Best regards, Tomasz