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Date: Sat, 2 Jul 2022 12:50:01 +0000
From: Peng Fan <peng.fan@....com>
To: Lucas Stach <l.stach@...gutronix.de>,
"Peng Fan (OSS)" <peng.fan@....nxp.com>,
"djakov@...nel.org" <djakov@...nel.org>,
"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>,
"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
>
> Am Donnerstag, dem 16.06.2022 um 15:33 +0800 schrieb Peng Fan (OSS):
> > 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
> > --- a/drivers/interconnect/imx/imx.c
> > +++ b/drivers/interconnect/imx/imx.c
> > @@ -10,6 +10,7 @@
> >
> > #include <linux/device.h>
> > #include <linux/interconnect-provider.h>
> > +#include <linux/io.h>
> > #include <linux/module.h>
> > #include <linux/of.h>
> > #include <linux/of_platform.h>
> > @@ -21,8 +22,10 @@
> > /* private icc_node data */
> > struct imx_icc_node {
> > const struct imx_icc_node_desc *desc;
> > + const struct imx_icc_noc_setting *setting;
> > struct device *qos_dev;
> > struct dev_pm_qos_request qos_req;
> > + struct imx_icc_provider *imx_provider;
> > };
> >
> > static int imx_icc_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
> > @@ -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;
> > + }
> > + }
> > +
> > if (!node_data->qos_dev)
> > return 0;
> >
> > @@ -135,7 +154,8 @@ static int imx_icc_node_init_qos(struct
> > icc_provider *provider, }
> >
> > static struct icc_node *imx_icc_node_add(struct imx_icc_provider
> *imx_provider,
> > - const struct imx_icc_node_desc
> *node_desc)
> > + const struct imx_icc_node_desc
> *node_desc,
> > + const struct imx_icc_noc_setting
> *setting)
> > {
> > struct icc_provider *provider = &imx_provider->provider;
> > struct device *dev = provider->dev;
> > @@ -164,6 +184,8 @@ static struct icc_node *imx_icc_node_add(struct
> imx_icc_provider *imx_provider,
> > node->name = node_desc->name;
> > node->data = node_data;
> > node_data->desc = node_desc;
> > + node_data->setting = setting;
> > + node_data->imx_provider = imx_provider;
> > icc_node_add(node, provider);
> >
> > if (node_desc->adj) {
> > @@ -187,7 +209,8 @@ static void imx_icc_unregister_nodes(struct
> > icc_provider *provider)
> >
> > static int imx_icc_register_nodes(struct imx_icc_provider *imx_provider,
> > const struct imx_icc_node_desc *descs,
> > - int count)
> > + int count,
> > + const struct imx_icc_noc_setting *settings)
> > {
> > struct icc_provider *provider = &imx_provider->provider;
> > struct icc_onecell_data *provider_data = provider->data; @@ -
> 199,7
> > +222,10 @@ static int imx_icc_register_nodes(struct imx_icc_provider
> *imx_provider,
> > const struct imx_icc_node_desc *node_desc = &descs[i];
> > size_t j;
> >
> > - node = imx_icc_node_add(imx_provider, node_desc);
> > + if (settings)
> > + node = imx_icc_node_add(imx_provider, node_desc,
> &settings[node_desc->id]);
> > + else
> > + node = imx_icc_node_add(imx_provider, node_desc,
> NULL);
>
> Maybe just write as
> node = imx_icc_node_add(imx_provider, node_desc, settings ?
> &settings[node_desc->id] : NULL);
Sure, cleaner.
>
> But I don't really care, so feel free to ignore this suggestion if you don't like it.
>
> > if (IS_ERR(node)) {
> > ret = dev_err_probe(provider->dev, PTR_ERR(node),
> > "failed to add %s\n",
> > node_desc->name);
> > @@ -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)
> > + 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;
> >
> > diff --git a/drivers/interconnect/imx/imx.h
> > b/drivers/interconnect/imx/imx.h index 0ad2c654c222..1da87cfe27da
> > 100644
> > --- a/drivers/interconnect/imx/imx.h
> > +++ b/drivers/interconnect/imx/imx.h
> > @@ -15,6 +15,31 @@
> >
> > #define IMX_ICC_MAX_LINKS 4
> >
> > +/*
> > + * High throughput priority level in Regulator mode
> > + * Read Priority in Fixed/Limiter mode */
> > +#define PRIORITY0_SHIFT 0
> > +/*
> > + * Low throughput priority level in Regulator mode
> > + * Write Priority in Fixed/Limiter mode */
> > +#define PRIORITY1_SHIFT 8
> > +#define PRIORITY_MASK 0x7
> > +
> > +#define PRIORITY_COMP_MARK BIT(31) /* Must set */
> > +
> > +#define IMX_NOC_MODE_FIXED 0
> > +#define IMX_NOC_MODE_LIMITER 1
> > +#define IMX_NOC_MODE_BYPASS 2
> > +#define IMX_NOC_MODE_REGULATOR 3
> > +
> > +#define IMX_NOC_PRIO_REG 0x8
> > +#define IMX_NOC_MODE_REG 0xC
> > +#define IMX_NOC_BANDWIDTH_REG 0x10
> > +#define IMX_NOC_SATURATION 0x14
> > +#define IMX_NOC_EXT_CTL_REG 0x18
> > +
> > struct imx_icc_provider {
> > void __iomem *noc_base;
> > struct icc_provider provider;
> > @@ -44,6 +69,22 @@ struct imx_icc_node_desc {
> > const struct imx_icc_node_adj_desc *adj; };
> >
> > +/*
> > + * struct imx_icc_noc_setting - Describe an interconnect node
> > setting
> > + * @ignore: indicate whether need apply this setting
> > + * @reg: register offset inside the NoC
> > + * @prio_level: priority level
> > + * @mode: functional mode
> > + * @ext_control: external input control */ struct
> > +imx_icc_noc_setting {
> > + bool ignore;
>
> I don't like this ignore member. Can we get rid of this and make the "don't
> touch" a special mode, like IMX_NOC_MODE_UNCONFIGURED?
I'll address in V3.
Thanks,
Peng.
>
> Other than those two nitpicks, the patch looks good.
>
> Regards,
> Lucas
>
> > + u32 reg;
> > + u32 prio_level;
> > + u32 mode;
> > + u32 ext_control;
> > +};
> > +
> > #define DEFINE_BUS_INTERCONNECT(_name, _id, _adj, ...)
> \
> > { \
> > .id = _id, \
> > @@ -61,7 +102,8 @@ struct imx_icc_node_desc {
> >
> > int imx_icc_register(struct platform_device *pdev,
> > struct imx_icc_node_desc *nodes,
> > - int nodes_count);
> > + int nodes_count,
> > + struct imx_icc_noc_setting *noc_settings);
> > int imx_icc_unregister(struct platform_device *pdev);
> >
> > #endif /* __DRIVERS_INTERCONNECT_IMX_H */ diff --git
> > a/drivers/interconnect/imx/imx8mm.c
> > b/drivers/interconnect/imx/imx8mm.c
> > index 1083490bb391..ae797412db96 100644
> > --- a/drivers/interconnect/imx/imx8mm.c
> > +++ b/drivers/interconnect/imx/imx8mm.c
> > @@ -83,7 +83,7 @@ static struct imx_icc_node_desc nodes[] = {
> >
> > static int imx8mm_icc_probe(struct platform_device *pdev) {
> > - return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
> > + return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes), NULL);
> > }
> >
> > static int imx8mm_icc_remove(struct platform_device *pdev) diff --git
> > a/drivers/interconnect/imx/imx8mn.c
> > b/drivers/interconnect/imx/imx8mn.c
> > index ad97e55fd4e5..1ce94c5bdd8c 100644
> > --- a/drivers/interconnect/imx/imx8mn.c
> > +++ b/drivers/interconnect/imx/imx8mn.c
> > @@ -72,7 +72,7 @@ static struct imx_icc_node_desc nodes[] = {
> >
> > static int imx8mn_icc_probe(struct platform_device *pdev) {
> > - return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
> > + return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes), NULL);
> > }
> >
> > static int imx8mn_icc_remove(struct platform_device *pdev) diff --git
> > a/drivers/interconnect/imx/imx8mq.c
> > b/drivers/interconnect/imx/imx8mq.c
> > index d7768d3c6d8a..7f00a0511c6e 100644
> > --- a/drivers/interconnect/imx/imx8mq.c
> > +++ b/drivers/interconnect/imx/imx8mq.c
> > @@ -82,7 +82,7 @@ static struct imx_icc_node_desc nodes[] = {
> >
> > static int imx8mq_icc_probe(struct platform_device *pdev) {
> > - return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
> > + return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes), NULL);
> > }
> >
> > static int imx8mq_icc_remove(struct platform_device *pdev)
>
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