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From: Anson Huang To: Marc Kleine-Budde , "jassisinghbrar@gmail.com" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: RE: [PATCH] mailbox: imx: Support runtime PM Thread-Topic: [PATCH] mailbox: imx: Support runtime PM Thread-Index: AQHWEY+/xCVMpCFwWEOKIpvxyYiJiah3AcmAgAAEhbA= Date: Mon, 13 Apr 2020 13:13:28 +0000 Message-ID: References: <1586780730-6117-1-git-send-email-Anson.Huang@nxp.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=anson.huang@nxp.com; x-originating-ip: [183.192.13.100] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: da4fc591-4a88-443a-4457-08d7dfac74e6 x-ms-traffictypediagnostic: DB3PR0402MB3835:|DB3PR0402MB3835: x-ms-exchange-transport-forked: True 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HOSTED X-MS-Exchange-CrossTenant-userprincipalname: r0rtf/QQ5XbzxgJibuzqZZ2ihYqv2UgAIgY4XB+3p127ns/W2InmKduNbnz5jJoNK6/sTaIYs/nw/vDzl/BY6g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR0402MB3835 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200413_061334_500855_B10C50A0 X-CRM114-Status: GOOD ( 22.43 ) 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: dl-linux-imx 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, Marc > Subject: Re: [PATCH] mailbox: imx: Support runtime PM > > On 4/13/20 2:25 PM, Anson Huang wrote: > > Some power hungry sub-systems like VPU has its own MUs which also use > > mailbox driver, current mailbox driver uses platform driver model and > > MU's power will be ON after driver probed and left ON there, it may > > cause the whole sub-system can NOT enter lower power mode, take VPU > > driver for example, it has runtime PM support, but due to its MU > > always ON, the VPU sub-system will be always ON and consume many power > > during kernel idle. > > > > To save power in kernel idle, mailbox driver needs to support runtime > > PM in order to power off MU when it is unused. However, the runtime > > suspend/resume can ONLY be implemented in mailbox's .shutdown/.startup > > callback, so its consumer needs to call > > mbox_request_channel()/mbox_free_channel() in consumer driver's > > runtime PM callback, then the MU's power will be ON/OFF along with > > consumer's runtime PM status. > > > > Signed-off-by: Anson Huang > > --- > > drivers/mailbox/imx-mailbox.c | 27 ++++++++++++++++++++++++++- > > 1 file changed, 26 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/mailbox/imx-mailbox.c > > b/drivers/mailbox/imx-mailbox.c index 7906624..97bf0ac 100644 > > --- a/drivers/mailbox/imx-mailbox.c > > +++ b/drivers/mailbox/imx-mailbox.c > > @@ -12,6 +12,7 @@ > > #include #include > > #include > > +#include > > #include > > > > #define IMX_MU_xSR_GIPn(x) BIT(28 + (3 - (x))) > > @@ -287,6 +288,7 @@ static int imx_mu_startup(struct mbox_chan *chan) > > struct imx_mu_con_priv *cp = chan->con_priv; > > int ret; > > > > + pm_runtime_get_sync(priv->dev); > > if (cp->type == IMX_MU_TYPE_TXDB) { > > /* Tx doorbell don't have ACK support */ > > tasklet_init(&cp->txdb_tasklet, imx_mu_txdb_tasklet, @@ -323,6 > > +325,7 @@ static void imx_mu_shutdown(struct mbox_chan *chan) > > > > if (cp->type == IMX_MU_TYPE_TXDB) { > > tasklet_kill(&cp->txdb_tasklet); > > + pm_runtime_put_sync(priv->dev); > > return; > > } > > > > @@ -341,6 +344,7 @@ static void imx_mu_shutdown(struct mbox_chan > *chan) > > } > > > > free_irq(priv->irq, chan); > > + pm_runtime_put_sync(priv->dev); > > } > > > > static const struct mbox_chan_ops imx_mu_ops = { @@ -508,7 +512,27 > @@ > > static int imx_mu_probe(struct platform_device *pdev) > > > > platform_set_drvdata(pdev, priv); > > > > - return devm_mbox_controller_register(dev, &priv->mbox); > > + ret = devm_mbox_controller_register(dev, &priv->mbox); > > + if (ret) > > + return ret; > > + > > + pm_runtime_enable(dev); > > + > > First registering at the system and then setting up the power management > looks racy. Don't know if this is serialized by some other means. Don't have other means, just refer to drivers/mailbox/omap-mailbox.c, it has same sequence, NOT sure if there is special requirement about this sequence. Thanks, Anson _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel