linux-kernel - RE: [PATCH V2 8/9] interconnect: imx: configure NoC mode/prioriry/ext

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Message-ID: <DU0PR04MB94173A39251811928E28A5E788BC9@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Sat, 2 Jul 2022 12:41:14 +0000
From:   Peng Fan <peng.fan@....com>
To:     Georgi Djakov <djakov@...nel.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>, Abel Vesa <abel.vesa@....com>,
        "abailon@...libre.com" <abailon@...libre.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "marex@...x.de" <marex@...x.de>,
        "paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
        "Markus.Niebel@...tq-group.com" <Markus.Niebel@...tq-group.com>,
        "aford173@...il.com" <aford173@...il.com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "abelvesa@...nel.org" <abelvesa@...nel.org>
Subject: RE: [PATCH V2 8/9] interconnect: imx: configure NoC
 mode/prioriry/ext_control

> Subject: Re: [PATCH V2 8/9] interconnect: imx: configure NoC
> mode/prioriry/ext_control
> 
> Hi Peng,
> 
> On 16.06.22 10:33, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > Introduce imx_icc_noc_setting structure to describe a master port
> > setting Pass imx_icc_noc_setting as a parameter from specific driver
> > Set priority level, mode, ext control in imx_icc_node_set
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >   drivers/interconnect/imx/imx.c    | 43 ++++++++++++++++++++++++++----
> >   drivers/interconnect/imx/imx.h    | 44
> ++++++++++++++++++++++++++++++-
> >   drivers/interconnect/imx/imx8mm.c |  2 +-
> >   drivers/interconnect/imx/imx8mn.c |  2 +-
> >   drivers/interconnect/imx/imx8mq.c |  2 +-
> >   5 files changed, 84 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/interconnect/imx/imx.c
> > b/drivers/interconnect/imx/imx.c index 78557fe6da2c..bd728caf2b85
> > 100644
> 
> [..]
> 
> > @@ -37,8 +40,24 @@ static int imx_icc_node_set(struct icc_node *node)
> >   {
> >   	struct device *dev = node->provider->dev;
> >   	struct imx_icc_node *node_data = node->data;
> > +	void __iomem *base;
> > +	u32 prio;
> >   	u64 freq;
> >
> > +	if (node_data->setting && !node_data->setting->ignore && node-
> >peak_bw) {
> > +		base = node_data->setting->reg + node_data-
> >imx_provider->noc_base;
> > +		if (node_data->setting->mode == IMX_NOC_MODE_FIXED) {
> > +			prio = node_data->setting->prio_level;
> > +			prio = PRIORITY_COMP_MARK | (prio << 8) | prio;
> > +			writel(prio, base + IMX_NOC_PRIO_REG);
> > +			writel(node_data->setting->mode, base +
> IMX_NOC_MODE_REG);
> > +			writel(node_data->setting->ext_control, base +
> IMX_NOC_EXT_CTL_REG);
> > +		} else {
> > +			dev_info(dev, "mode: %d not supported\n",
> node_data->setting->mode);
> > +			return -ENOTSUPP;
> 
> Nit: I believe that -EOPNOTSUPP is the preferred error code.

Fix in V3.

> 
> > +		}
> > +	}
> > +
> >   	if (!node_data->qos_dev)
> >   		return 0;
> >
> 
> [..]
> 
> > @@ -237,7 +263,8 @@ static int get_max_node_id(struct
> imx_icc_node_desc *nodes, int nodes_count)
> >   }
> >
> >   int imx_icc_register(struct platform_device *pdev,
> > -		     struct imx_icc_node_desc *nodes, int nodes_count)
> > +		     struct imx_icc_node_desc *nodes, int nodes_count,
> > +		     struct imx_icc_noc_setting *settings)
> >   {
> >   	struct device *dev = &pdev->dev;
> >   	struct icc_onecell_data *data;
> > @@ -267,13 +294,19 @@ int imx_icc_register(struct platform_device
> *pdev,
> >   	provider->dev->of_node = dev->parent->of_node;
> >   	platform_set_drvdata(pdev, imx_provider);
> >
> > +	if (settings) {
> > +		imx_provider->noc_base = devm_of_iomap(dev, provider-
> >dev->of_node, 0, NULL);
> > +		if (!imx_provider->noc_base)
> 
> devm_of_iomap() returns ERR_PTR(). So we should check it with IS_ERR().

Oops, fix in V3.

Thanks,
Peng.

> 
> Thanks,
> Georgi
> 
> > +			return PTR_ERR(imx_provider->noc_base);
> > +	}
> > +
> >   	ret = icc_provider_add(provider);
> >   	if (ret) {
> >   		dev_err(dev, "error adding interconnect provider: %d\n",
> ret);
> >   		return ret;
> >   	}
> >
> > -	ret = imx_icc_register_nodes(imx_provider, nodes, nodes_count);
> > +	ret = imx_icc_register_nodes(imx_provider, nodes, nodes_count,
> > +settings);
> >   	if (ret)
> >   		goto provider_del;
> >