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h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=AU7716CyemDmasYys+I/AcpiH3oj4x9jWwzzxX5tgKU=; b=FV8uxcahx1Dw6EJ+cMY+uGSZP9cesdz8ju+1MbLqIeJVoA2C5eJEgBljQzMSIX5nt5 AxIvaD4hWBKoWM6zLhQuieI3ZBadfGUlI0Iyi3sNDpP1QHY/NzasIYn6wHinZ533Xfdl 0IiXgye9aNMHderJFLXbLs+g0VOV1IKSAVBFumHhpC462/kL2uHq3uDLmJQh+SBu9bsV TFeL/hvRBuYCBjOizAW+eH/gqvrMJf0EAUuOvJmYjppuK5fVhW7eZGc5QdOGwkgll5xi Slngft2PPKPzk94y/W65uqupBhJt+AjOV8rebaAQPX62Lc8RvdKDnVZsv2iAo1sDLeeH ND/A== X-Gm-Message-State: AOAM530bqqQm/wLSWOPfCxma7DhGKAvZpaA9SZ8LVg7W8FXQRJcsPFEn n/PShSEtjrfjJONKY+A7VTs8BBWRKI6QDBQ3zVYSkQ== X-Google-Smtp-Source: ABdhPJzUVd1aHH7lzmeRjgv7wJnpzxeLVtfR5lAOrmZRujWuS3ksAZB8tphWnFf4uD7EhaGC6PT22n7EI0O6IBqmsk8= X-Received: by 2002:a92:d182:: with SMTP id z2mr6049581ilz.47.1590590811109; Wed, 27 May 2020 07:46:51 -0700 (PDT) MIME-Version: 1.0 References: <20200403094033.8288-1-xia.jiang@mediatek.com> <20200403094033.8288-7-xia.jiang@mediatek.com> <20200521153257.GF209565@chromium.org> <1590544320.12671.10.camel@mhfsdcap03> In-Reply-To: <1590544320.12671.10.camel@mhfsdcap03> From: Tomasz Figa Date: Wed, 27 May 2020 16:46:39 +0200 Message-ID: Subject: Re: [PATCH v8 06/14] media: platform: Improve the implementation of the system PM ops To: Xia Jiang X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200527_074652_091641_8581467D X-CRM114-Status: GOOD ( 25.68 ) 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: Nicolas Boichat , linux-devicetree , Hsu Wei-Cheng , srv_heupstream , Rick Chang , Sergey Senozhatsky , Linux Kernel Mailing List , maoguang.meng@mediatek.com, Mauro Carvalho Chehab , Sj Huang , Rob Herring , Matthias Brugger , Hans Verkuil , "moderated list:ARM/Mediatek SoC support" , Marek Szyprowski , "list@263.net:IOMMU DRIVERS , Joerg Roedel , " , Linux Media Mailing List 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 On Wed, May 27, 2020 at 3:58 AM Xia Jiang wrote: > > On Thu, 2020-05-21 at 15:32 +0000, Tomasz Figa wrote: > > Hi Xia, > > > > On Fri, Apr 03, 2020 at 05:40:25PM +0800, Xia Jiang wrote: > > > Cancel reset hw operation in suspend and resume function because this > > > will be done in device_run(). > > > > This and... > > > > > Add spin_lock and unlock operation in irq and resume function to make > > > sure that the current frame is processed completely before suspend. > > > > ...this are two separate changes. Please split. > > > > > > > > Signed-off-by: Xia Jiang > > > --- > > > drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 11 +++++++++-- > > > 1 file changed, 9 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > > > index dd5cadd101ef..2fa3711fdc9b 100644 > > > --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > > > +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c > > > @@ -911,6 +911,8 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv) > > > u32 dec_ret; > > > int i; > > > > > > + spin_lock(&jpeg->hw_lock); > > > + > > > > nit: For consistency, it is recommended to always use the same, i.e. the > > strongest, spin_(un)lock_ primitives when operating on the same spinlock. > > In this case it would be the irqsave(restore) variants. > > > > > dec_ret = mtk_jpeg_dec_get_int_status(jpeg->dec_reg_base); > > > dec_irq_ret = mtk_jpeg_dec_enum_result(dec_ret); > > > ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev); > > > @@ -941,6 +943,7 @@ 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); > > > + spin_unlock(&jpeg->hw_lock); > > > pm_runtime_put_sync(ctx->jpeg->dev); > > > return IRQ_HANDLED; > > > } > > > @@ -1191,7 +1194,6 @@ static __maybe_unused int mtk_jpeg_pm_suspend(struct device *dev) > > > { > > > struct mtk_jpeg_dev *jpeg = dev_get_drvdata(dev); > > > > > > - mtk_jpeg_dec_reset(jpeg->dec_reg_base); > > > mtk_jpeg_clk_off(jpeg); > > > > > > return 0; > > > @@ -1202,19 +1204,24 @@ static __maybe_unused int mtk_jpeg_pm_resume(struct device *dev) > > > struct mtk_jpeg_dev *jpeg = dev_get_drvdata(dev); > > > > > > mtk_jpeg_clk_on(jpeg); > > > - mtk_jpeg_dec_reset(jpeg->dec_reg_base); > > > > > > return 0; > > > } > > > > > > static __maybe_unused int mtk_jpeg_suspend(struct device *dev) > > > { > > > + struct mtk_jpeg_dev *jpeg = dev_get_drvdata(dev); > > > + unsigned long flags; > > > int ret; > > > > > > if (pm_runtime_suspended(dev)) > > > return 0; > > > > > > + spin_lock_irqsave(&jpeg->hw_lock, flags); > > > > What does this spinlock protect us from? I can see that it would prevent > > the interrupt handler from being called, but is it okay to suspend the > > system without handling the interrupt? > Dear Tomasz, > I mean that if current image is processed in irq handler,suspend > function can not get the lock(it was locked in irq handler).Should I > move the spin_lock_irqsave(&jpeg->hw_lock, flags) to the start location > of suspend function or Do we have any guarantee that the interrupt handler would be executed and acquire the spinlock before mtk_jpeg_suspend() is called? > use wait_event_timeout() to handle the interrupt > before suspend? Yes, that would indeed work better. :) However, please refer to the v4l2_m2m suspend/resume helpers [1] and the MTK FD driver [2] for how to implement this nicely. [1] https://patchwork.kernel.org/patch/11272917/ [2] https://patchwork.kernel.org/patch/11272903/ Best regards, Tomasz _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek