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Mon, 10 Jul 2023 08:54:01 -0700 (PDT) Date: Mon, 10 Jul 2023 09:53:59 -0600 From: Mathieu Poirier To: Marek Vasut Cc: linux-remoteproc@vger.kernel.org, Peng Fan , Jacky Bai , Ye Li , Bjorn Andersson , Conor Dooley , Fabio Estevam , Krzysztof Kozlowski , NXP Linux Team , Pengutronix Kernel Team , Rob Herring , Sascha Hauer , Shawn Guo , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 2/2] remoteproc: imx_rproc: add start up delay Message-ID: References: <20230707232444.374431-1-marex@denx.de> <20230707232444.374431-2-marex@denx.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230707232444.374431-2-marex@denx.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230710_085405_596758_12659A4E X-CRM114-Status: GOOD ( 24.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Jul 08, 2023 at 01:24:44AM +0200, Marek Vasut wrote: > From: Peng Fan > > There is case that after remoteproc start remote processor[M4], the M4 > runs slow and before M4 finish its own rpmsg framework initialization, > linux sends out vring kick message, then M4 firmware drops the kick > message. Some NXP released Cortex-M[x] images has such limitation that > it requires linux sends out vring kick message after M4 firmware finish > its rpmsg framework initialization. > > Reviewed-by: Jacky Bai > Reviewed-by: Ye Li > Signed-off-by: Peng Fan > --- > Note: picked from NXP downstream LF-6630-2 remoteproc: imx_rproc: add start up delay > https://github.com/nxp-imx/linux-imx.git 0b1b91c95b291a3b60d6224b13f6a95a75896abf > --- > Note: Literally all of the NXP BSP 2.13.0 firmware builds fail to boot > without this being set to something like 50..500 ms , so this is > rather useful to have. My stance on this hasn't changed - hacks such as these do not scale and are a nightmare to maintain. The problem should be fixed in the M4's firmware. > --- > Cc: Bjorn Andersson > Cc: Conor Dooley > Cc: Fabio Estevam > Cc: Krzysztof Kozlowski > Cc: Mathieu Poirier > Cc: NXP Linux Team > Cc: Peng Fan > Cc: Pengutronix Kernel Team > Cc: Rob Herring > Cc: Sascha Hauer > Cc: Shawn Guo > Cc: devicetree@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-remoteproc@vger.kernel.org > --- > drivers/remoteproc/imx_rproc.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c > index f9874fc5a80ff..d0eb96d6a4fe1 100644 > --- a/drivers/remoteproc/imx_rproc.c > +++ b/drivers/remoteproc/imx_rproc.c > @@ -6,6 +6,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -110,6 +111,7 @@ struct imx_rproc { > u32 core_index; > struct device **pd_dev; > struct device_link **pd_dev_link; > + u32 startup_delay; > }; > > static const struct imx_rproc_att imx_rproc_att_imx93[] = { > @@ -382,6 +384,9 @@ static int imx_rproc_start(struct rproc *rproc) > if (ret) > dev_err(dev, "Failed to enable remote core!\n"); > > + if (priv->startup_delay) > + msleep(priv->startup_delay); > + > return ret; > } > > @@ -1090,6 +1095,10 @@ static int imx_rproc_probe(struct platform_device *pdev) > if (rproc->state != RPROC_DETACHED) > rproc->auto_boot = of_property_read_bool(np, "fsl,auto-boot"); > > + ret = of_property_read_u32(dev->of_node, "fsl,startup-delay-ms", &priv->startup_delay); > + if (ret) > + priv->startup_delay = 0; > + > ret = rproc_add(rproc); > if (ret) { > dev_err(dev, "rproc_add failed\n"); > -- > 2.40.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel