Re: [PATCH V3 09/10] interconnect: mediatek: Add mt8183 interconnect provider driver

Georgi Djakov
2019-09-24T23:53:57Z

Hi Henry,

Please CC also the linux-pm@ list.

On 8/28/19 05:28, 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 | 3 +
> drivers/interconnect/mediatek/mtk-emi.c | 246 ++++++++++++++++++++++++++++++++
> 5 files changed, 264 insertions(+)
> create mode 100644 drivers/interconnect/mediatek/Kconfig
> create mode 100644 drivers/interconnect/mediatek/Makefile
> create mode 100644 drivers/interconnect/mediatek/mtk-emi.c
>
[..]
> +
> +#define MT8183_MAX_LINKS 6

Looks like 1 is enough. Sorry for missing this in my earlier review.

> +
> +/**
> + * 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
> + * @sum_avg: current sum aggregate value of all avg bw kBps requests
> + * @max_peak: current max aggregate value of all peak bw kBps requests
> + */
> +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, ...) \
> + static struct mtk_icc_node _name = { \
> + .name = #_name, \
> + .id = _id, \
> + .buswidth = _buswidth, \
> + .ep = _ep, \
> + .num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })), \
> +}
> +
> +DEFINE_MNODE(ddr_emi, SLAVE_DDR_EMI, 1024, 1, 0);
> +DEFINE_MNODE(mcusys, MASTER_MCUSYS, 256, 0, SLAVE_DDR_EMI);
> +DEFINE_MNODE(gpu, MASTER_GPUSYS, 256, 0, SLAVE_DDR_EMI);
> +DEFINE_MNODE(mmsys, MASTER_MMSYS, 256, 0, SLAVE_DDR_EMI);
> +DEFINE_MNODE(mm_vpu, MASTER_MM_VPU, 128, 0, MASTER_MMSYS);
> +DEFINE_MNODE(mm_disp, MASTER_MM_DISP, 128, 0, MASTER_MMSYS);
> +DEFINE_MNODE(mm_vdec, MASTER_MM_VDEC, 128, 0, MASTER_MMSYS);
> +DEFINE_MNODE(mm_venc, MASTER_MM_VENC, 128, 0, MASTER_MMSYS);
> +DEFINE_MNODE(mm_cam, MASTER_MM_CAM, 128, 0, MASTER_MMSYS);
> +DEFINE_MNODE(mm_img, MASTER_MM_IMG, 128, 0, MASTER_MMSYS);
> +DEFINE_MNODE(mm_mdp, MASTER_MM_MDP, 128, 0, MASTER_MMSYS);
> +
[..]

> +static int emi_icc_aggregate(struct icc_node *node, u32 avg_bw,
> + u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
> +{

The prototype of this function has changed meanwhile, so you might want to update.

[..]
> +static int emi_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 = emi_icc_set;
> + provider->aggregate = emi_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 0;
> +err:
> + list_for_each_entry(node, &provider->nodes, node_list) {
> + icc_node_del(node);
> + icc_node_destroy(node->id);
> + }
> +
> + icc_provider_del(provider);

You can just call emi_icc_remove() instead of the above.

Thanks,
Georgi

> + return ret;
> +}
> +
> +static int emi_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);
> +}