From patchwork Wed Mar 28 22:30:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suman Anna X-Patchwork-Id: 10314223 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D40B660467 for ; Wed, 28 Mar 2018 22:31:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B51A429A41 for ; Wed, 28 Mar 2018 22:31:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A78DF29A8B; Wed, 28 Mar 2018 22:31:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F310A29A41 for ; 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Wed, 28 Mar 2018 17:30:28 -0500 Received: from DLEE105.ent.ti.com (157.170.170.35) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1261.35; Wed, 28 Mar 2018 17:30:27 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1261.35 via Frontend Transport; Wed, 28 Mar 2018 17:30:27 -0500 Received: from [128.247.58.153] (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id w2SMURvP008167; Wed, 28 Mar 2018 17:30:27 -0500 Subject: Re: [PATCH v3 7/8] remoteproc/davinci: use the reset framework To: Bartosz Golaszewski , Sekhar Nori , Kevin Hilman , Rob Herring , Mark Rutland , Russell King , David Lechner , Michael Turquette , Stephen Boyd , Ohad Ben-Cohen , Bjorn Andersson , Philipp Zabel CC: , , , , , Bartosz Golaszewski References: <20180327092031.11251-1-brgl@bgdev.pl> <20180327092031.11251-8-brgl@bgdev.pl> From: Suman Anna Message-ID: <51e33d41-37b1-9e88-4a13-503bb39e2e40@ti.com> Date: Wed, 28 Mar 2018 17:30:27 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180327092031.11251-8-brgl@bgdev.pl> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi Bart, On 03/27/2018 04:20 AM, Bartosz Golaszewski wrote: > From: Bartosz Golaszewski > > Switch to using the reset framework instead of handcoded reset routines > we used so far. > > Signed-off-by: Bartosz Golaszewski > --- > drivers/remoteproc/da8xx_remoteproc.c | 33 ++++++++++++++++++++++++++++----- > 1 file changed, 28 insertions(+), 5 deletions(-) > > diff --git a/drivers/remoteproc/da8xx_remoteproc.c b/drivers/remoteproc/da8xx_remoteproc.c > index b668e32996e2..788f59809c02 100644 > --- a/drivers/remoteproc/da8xx_remoteproc.c > +++ b/drivers/remoteproc/da8xx_remoteproc.c > @@ -10,6 +10,7 @@ > > #include > #include > +#include > #include > #include > #include > @@ -20,8 +21,6 @@ > #include > #include > > -#include /* for davinci_clk_reset_assert/deassert() */ > - > #include "remoteproc_internal.h" > > static char *da8xx_fw_name; > @@ -72,6 +71,7 @@ struct da8xx_rproc { > struct da8xx_rproc_mem *mem; > int num_mems; > struct clk *dsp_clk; > + struct reset_control *dsp_reset; > void (*ack_fxn)(struct irq_data *data); > struct irq_data *irq_data; > void __iomem *chipsig; > @@ -138,6 +138,7 @@ static int da8xx_rproc_start(struct rproc *rproc) > struct device *dev = rproc->dev.parent; > struct da8xx_rproc *drproc = (struct da8xx_rproc *)rproc->priv; > struct clk *dsp_clk = drproc->dsp_clk; > + struct reset_control *dsp_reset = drproc->dsp_reset; > int ret; > > /* hw requires the start (boot) address be on 1KB boundary */ > @@ -155,7 +156,12 @@ static int da8xx_rproc_start(struct rproc *rproc) > return ret; > } > > - davinci_clk_reset_deassert(dsp_clk); > + ret = reset_control_deassert(dsp_reset); > + if (ret) { > + dev_err(dev, "reset_control_deassert() failed: %d\n", ret); > + clk_disable_unprepare(dsp_clk); > + return ret; > + } > > return 0; > } > @@ -163,8 +169,15 @@ static int da8xx_rproc_start(struct rproc *rproc) > static int da8xx_rproc_stop(struct rproc *rproc) > { > struct da8xx_rproc *drproc = rproc->priv; > + struct device *dev = rproc->dev.parent; > + int ret; > + > + ret = reset_control_assert(drproc->dsp_reset); > + if (ret) { > + dev_err(dev, "reset_control_assert() failed: %d\n", ret); > + return ret; > + } > > - davinci_clk_reset_assert(drproc->dsp_clk); > clk_disable_unprepare(drproc->dsp_clk); > > return 0; > @@ -232,6 +245,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev) > struct resource *bootreg_res; > struct resource *chipsig_res; > struct clk *dsp_clk; > + struct reset_control *dsp_reset; > void __iomem *chipsig; > void __iomem *bootreg; > int irq; > @@ -268,6 +282,15 @@ static int da8xx_rproc_probe(struct platform_device *pdev) > return PTR_ERR(dsp_clk); > } > > + dsp_reset = devm_reset_control_get_exclusive(dev, NULL); > + if (IS_ERR(dsp_reset)) { > + if (PTR_ERR(dsp_reset) != -EPROBE_DEFER) > + dev_err(dev, "unable to get reset control: %ld\n", > + PTR_ERR(dsp_reset)); > + > + return PTR_ERR(dsp_reset); > + } > + > if (dev->of_node) { > ret = of_reserved_mem_device_init(dev); > if (ret) { > @@ -309,7 +332,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev) > * *not* in reset, but da8xx_rproc_start() needs the DSP to be > * held in reset at the time it is called. > */ > - ret = davinci_clk_reset_assert(drproc->dsp_clk); > + ret = reset_control_assert(dsp_reset); > if (ret) > goto free_rproc; > Tested your previous branch, need one more change in this patch to have the remoteproc boot be actually executing some code. The acquired dsp_reset is not stored in the drproc, so the start and stop were not effective. The issue was masked because reset_control_assert() and deassert() return 0 when a NULL pointer is passed in. regards Suman --- To unsubscribe from this list: send the line "unsubscribe linux-clk" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- a/drivers/remoteproc/da8xx_remoteproc.c +++ b/drivers/remoteproc/da8xx_remoteproc.c @@ -311,6 +311,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev) drproc = rproc->priv; drproc->rproc = rproc; drproc->dsp_clk = dsp_clk; + drproc->dsp_reset = dsp_reset; rproc->has_iommu = false;