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Date: Wed, 29 Jun 2022 17:14:55 +0200
From: Lucas Stach <l.stach@...gutronix.de>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>, djakov@...nel.org,
shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
abel.vesa@....com, abailon@...libre.com,
laurent.pinchart@...asonboard.com, marex@...x.de,
paul.elder@...asonboard.com, Markus.Niebel@...tq-group.com,
aford173@...il.com
Cc: kernel@...gutronix.de, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-imx@....com,
abelvesa@...nel.org, Peng Fan <peng.fan@....com>
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);
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?
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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