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[35.190.215.205]) by smtp.gmail.com with ESMTPSA id i11sm7245926wrc.35.2020.05.21.08.32.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 08:32:59 -0700 (PDT) Date: Thu, 21 May 2020 15:32:57 +0000 From: Tomasz Figa To: Xia Jiang Subject: Re: [PATCH v8 06/14] media: platform: Improve the implementation of the system PM ops Message-ID: <20200521153257.GF209565@chromium.org> References: <20200403094033.8288-1-xia.jiang@mediatek.com> <20200403094033.8288-7-xia.jiang@mediatek.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200403094033.8288-7-xia.jiang@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200521_083302_429807_6986C2EC X-CRM114-Status: GOOD ( 19.57 ) 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 05:40:25PM +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? > + > ret = mtk_jpeg_pm_suspend(dev); > + Looking at the implementation of mtk_jpeg_pm_suspend(), all it does is disabling the clock. How do we make sure that there is no frame currently being processed by the hardware? Best regards, Tomasz _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel