Re: [RFC V2 10/11] interconnect: mediatek: Add mt8183 interconnect provider driver

From: Henry Chen <henryc.chen@mediatek.com>
To: Georgi Djakov <georgi.djakov@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Viresh Kumar <vireshk@kernel.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Nicolas Boichat <drinkcat@google.com>,
	Fan Chen <fan.chen@mediatek.com>,
	James Liao <jamesjj.liao@mediatek.com>,
	Weiyi Lu <weiyi.lu@mediatek.com>, <devicetree@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Linux PM list <linux-pm@vger.kernel.org>
Subject: Re: [RFC V2 10/11] interconnect: mediatek: Add mt8183 interconnect provider driver
Date: Mon, 19 Aug 2019 09:53:59 +0800	[thread overview]
Message-ID: <1566179639.6371.14.camel@mtksdaap41> (raw)
In-Reply-To: <b8db4f70-4b95-5a98-38b4-9990bae023b4@linaro.org>

Hi Georgi,

Sorry for late reply.

On Tue, 2019-05-14 at 09:43 +0300, Georgi Djakov wrote:
> Hi Henry,
> 
> On 4/30/19 11:51, Henry Chen wrote:
> > Introduce Mediatek MT8183 specific provider driver using the
> > interconnect framework.
> > 
> > Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> > ---
> >  drivers/interconnect/Kconfig           |   1 +
> >  drivers/interconnect/Makefile          |   1 +
> >  drivers/interconnect/mediatek/Kconfig  |  13 ++
> >  drivers/interconnect/mediatek/Makefile |   5 +
> >  drivers/interconnect/mediatek/mt8183.c | 223 +++++++++++++++++++++++++++++++++
> >  5 files changed, 243 insertions(+)
> >  create mode 100644 drivers/interconnect/mediatek/Kconfig
> >  create mode 100644 drivers/interconnect/mediatek/Makefile
> >  create mode 100644 drivers/interconnect/mediatek/mt8183.c
> > 
> > diff --git a/drivers/interconnect/Kconfig b/drivers/interconnect/Kconfig
> > index 07a8276..ac41ea6 100644
> > --- a/drivers/interconnect/Kconfig
> > +++ b/drivers/interconnect/Kconfig
> > @@ -11,5 +11,6 @@ menuconfig INTERCONNECT
> >  if INTERCONNECT
> >  
> >  source "drivers/interconnect/qcom/Kconfig"
> > +source "drivers/interconnect/mediatek/Kconfig"
> >  
> >  endif
> > diff --git a/drivers/interconnect/Makefile b/drivers/interconnect/Makefile
> > index 28f2ab0..253f24a3 100644
> > --- a/drivers/interconnect/Makefile
> > +++ b/drivers/interconnect/Makefile
> > @@ -4,3 +4,4 @@ icc-core-objs				:= core.o
> >  
> >  obj-$(CONFIG_INTERCONNECT)		+= icc-core.o
> >  obj-$(CONFIG_INTERCONNECT_QCOM)		+= qcom/
> > +obj-$(CONFIG_INTERCONNECT_MTK)		+= mediatek/
> > diff --git a/drivers/interconnect/mediatek/Kconfig b/drivers/interconnect/mediatek/Kconfig
> > new file mode 100644
> > index 0000000..0686494
> > --- /dev/null
> > +++ b/drivers/interconnect/mediatek/Kconfig
> > @@ -0,0 +1,13 @@
> > +config INTERCONNECT_MTK
> > +	bool "Mediatek Network-on-Chip interconnect drivers"
> > +	depends on ARCH_MEDIATEK
> > +	help
> > +	  Support for Mediatek's Network-on-Chip interconnect hardware.
> > +
> > +config INTERCONNECT_MTK_MT8183
> > +	tristate "Mediatek MT8183 interconnect driver"
> > +	depends on INTERCONNECT_MTK
> > +	depends on (MTK_DVFSRC && OF)
> > +	help
> > +	  This is a driver for the Mediatek Network-on-Chip on mt8183-based
> > +	  platforms.
> > diff --git a/drivers/interconnect/mediatek/Makefile b/drivers/interconnect/mediatek/Makefile
> > new file mode 100644
> > index 0000000..a39ceee
> > --- /dev/null
> > +++ b/drivers/interconnect/mediatek/Makefile
> > @@ -0,0 +1,5 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +mtk-mt8183-objs			:= mt8183.o
> > +
> > +obj-$(CONFIG_INTERCONNECT_MTK_MT8183) += mtk-mt8183.o
> > \ No newline at end of file
> > diff --git a/drivers/interconnect/mediatek/mt8183.c b/drivers/interconnect/mediatek/mt8183.c
> > new file mode 100644
> > index 0000000..38ffe0b
> > --- /dev/null
> > +++ b/drivers/interconnect/mediatek/mt8183.c
> > @@ -0,0 +1,223 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> > + *
> > + */
> > +
> > +#include <dt-bindings/interconnect/mtk,mt8183.h>
> > +#include <linux/device.h>
> > +#include <linux/interconnect.h>
> 
> This is not needed.
ok, thanks.
> 
> > +#include <linux/interconnect-provider.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/platform_device.h>
> > +#include <soc/mediatek/mtk_dvfsrc.h>
> > +
> > +#define MT8183_MAX_LINKS	6
> > +
> > +/**
> > + * struct mtk_icc_node - Mediatek specific interconnect nodes
> > + * @name: the node name used in debugfs
> > + * @ep: true if the node is an end point.
> > + * @id: a unique node identifier
> > + * @links: an array of nodes where we can go next while traversing
> > + * @num_links: the total number of @links
> > + * @buswidth: width of the interconnect between a node and the bus
> 
> Maybe mention the units?
ok, I will add it.
> 
> > + * @sum_avg: current sum aggregate value of all avg bw requests
> > + * @max_peak: current max aggregate value of all peak bw requests
> 
> units?
> 
> > + */
> > +struct mtk_icc_node {
> > +	unsigned char *name;
> > +	bool ep;
> > +	u16 id;
> > +	u16 links[MT8183_MAX_LINKS];
> > +	u16 num_links;
> > +	u16 buswidth;
> > +	u64 sum_avg;
> > +	u64 max_peak;
> > +};
> > +
> > +struct mtk_icc_desc {
> > +	struct mtk_icc_node **nodes;
> > +	size_t num_nodes;
> > +};
> > +
> > +#define DEFINE_MNODE(_name, _id, _buswidth, _ep, _numlinks, ...)	\
> 
> We can drop the _numlinks and..
ok, thank you for the advice.
> 
> > +		static struct mtk_icc_node _name = {			\
> > +		.name = #_name,						\
> > +		.id = _id,						\
> > +		.buswidth = _buswidth,					\
> > +		.ep = _ep,						\
> > +		.num_links = _numlinks,					\
> 
> ..just use 	.num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ }))
> 
> > +		.links = { __VA_ARGS__ },				\
> > +}
> > +
> > +DEFINE_MNODE(ddr_emi, SLAVE_DDR_EMI, 1024, 1, 0, 0);
> > +DEFINE_MNODE(mcusys, MASTER_MCUSYS, 256, 0, 1, SLAVE_DDR_EMI);
> > +DEFINE_MNODE(gpu, MASTER_GPU, 256, 0, 1, SLAVE_DDR_EMI);
> > +DEFINE_MNODE(mmsys, MASTER_MMSYS, 256, 0, 1, SLAVE_DDR_EMI);
> > +DEFINE_MNODE(mm_vpu, MASTER_MM_VPU, 128, 0, 1, MASTER_MMSYS);
> > +DEFINE_MNODE(mm_disp, MASTER_MM_DISP, 128, 0, 1, MASTER_MMSYS);
> > +DEFINE_MNODE(mm_vdec, MASTER_MM_VDEC, 128, 0, 1, MASTER_MMSYS);
> > +DEFINE_MNODE(mm_venc, MASTER_MM_VENC, 128, 0, 1, MASTER_MMSYS);
> > +DEFINE_MNODE(mm_cam, MASTER_MM_CAM, 128, 0, 1, MASTER_MMSYS);
> > +DEFINE_MNODE(mm_img, MASTER_MM_IMG, 128, 0, 1, MASTER_MMSYS);
> > +DEFINE_MNODE(mm_mdp, MASTER_MM_MDP, 128, 0, 1, MASTER_MMSYS);
> > +
> > +static struct mtk_icc_node *mt8183_icc_nodes[] = {
> > +	&ddr_emi,
> > +	&mcusys,
> > +	&gpu,
> > +	&mmsys,
> > +	&mm_vpu,
> > +	&mm_disp,
> > +	&mm_vdec,
> > +	&mm_venc,
> > +	&mm_cam,
> > +	&mm_img,
> > +	&mm_mdp,
> > +};
> > +
> > +static struct mtk_icc_desc mt8183_icc = {
> > +	.nodes = mt8183_icc_nodes,
> > +	.num_nodes = ARRAY_SIZE(mt8183_icc_nodes),
> > +};
> > +
> > +static int mt8183_icc_aggregate(struct icc_node *node, u32 avg_bw,
> > +			      u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
> > +{
> > +	struct mtk_icc_node *in;
> > +
> > +	in = node->data;
> > +
> > +	*agg_avg += avg_bw;
> > +	*agg_peak = max_t(u32, *agg_peak, peak_bw);
> > +
> > +	in->sum_avg = *agg_avg;
> > +	in->max_peak = *agg_peak;
> > +
> > +	return 0;
> > +}
> > +
> > +static int mt8183_icc_set(struct icc_node *src, struct icc_node *dst)
> > +{
> > +	int ret = 0;
> > +	struct mtk_icc_node *node;
> > +
> > +	node = dst->data;
> > +	if (node->ep) {
> > +		pr_debug("sum_avg (%llu), max_peak (%llu)\n",
> > +			node->sum_avg, node->max_peak);
> > +		mtk_dvfsrc_send_request(src->provider->dev->parent,
> > +					MTK_DVFSRC_CMD_BW_REQUEST,
> > +					node->max_peak);
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > +static int mt8183_icc_probe(struct platform_device *pdev)
> > +{
> > +	int ret;
> > +	const struct mtk_icc_desc *desc;
> > +	struct icc_node *node;
> > +	struct icc_onecell_data *data;
> > +	struct icc_provider *provider;
> > +	struct mtk_icc_node **mnodes;
> > +	size_t num_nodes, i, j;
> > +
> > +	desc = of_device_get_match_data(&pdev->dev);
> > +	if (!desc)
> > +		return -EINVAL;
> > +
> > +	mnodes = desc->nodes;
> > +	num_nodes = desc->num_nodes;
> > +
> > +	provider = devm_kzalloc(&pdev->dev, sizeof(*provider), GFP_KERNEL);
> > +	if (!provider)
> > +		return -ENOMEM;
> > +
> > +	data = devm_kcalloc(&pdev->dev, num_nodes, sizeof(*node), GFP_KERNEL);
> > +	if (!data)
> > +		return -ENOMEM;
> > +
> > +	provider->dev = &pdev->dev;
> > +	provider->set = mt8183_icc_set;
> > +	provider->aggregate = mt8183_icc_aggregate;
> > +	provider->xlate = of_icc_xlate_onecell;
> > +	INIT_LIST_HEAD(&provider->nodes);
> > +	provider->data = data;
> > +
> > +	ret = icc_provider_add(provider);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "error adding interconnect provider\n");
> > +		return ret;
> > +	}
> > +
> > +	for (i = 0; i < num_nodes; i++) {
> > +		node = icc_node_create(mnodes[i]->id);
> > +		if (IS_ERR(node)) {
> > +			ret = PTR_ERR(node);
> > +			goto err;
> > +		}
> > +
> > +		node->name = mnodes[i]->name;
> > +		node->data = mnodes[i];
> > +		icc_node_add(node, provider);
> > +
> > +		dev_dbg(&pdev->dev, "registered node %s, num link: %d\n",
> > +			mnodes[i]->name, mnodes[i]->num_links);
> > +
> > +		/* populate links */
> > +		for (j = 0; j < mnodes[i]->num_links; j++)
> > +			icc_link_create(node, mnodes[i]->links[j]);
> > +
> > +		data->nodes[i] = node;
> > +	}
> > +	data->num_nodes = num_nodes;
> > +
> > +	platform_set_drvdata(pdev, provider);
> > +
> > +	return ret;
> 
> just return 0;
ok.
> 
> > +err:
> > +	list_for_each_entry(node, &provider->nodes, node_list) {
> > +		icc_node_del(node);
> > +		icc_node_destroy(node->id);
> > +	}
> > +
> > +	icc_provider_del(provider);
> > +	return ret;
> > +}
> > +
> > +static int mt8183_icc_remove(struct platform_device *pdev)
> > +{
> > +	struct icc_provider *provider = platform_get_drvdata(pdev);
> > +	struct icc_node *n;
> > +
> > +	list_for_each_entry(n, &provider->nodes, node_list) {
> > +		icc_node_del(n);
> > +		icc_node_destroy(n->id);
> > +	}
> > +
> > +	return icc_provider_del(provider);
> > +}
> > +
> > +static const struct of_device_id mt8183_icc_of_match[] = {
> > +	{ .compatible = "mediatek,mt8183-emi-icc", .data = &mt8183_icc },
> 
> A separate -icc compatible should not be needed.
ok.
> 
> Thanks,
> Georgi