linux-kernel - Re: [Patch v1 01/10] memory: tegra: add interconnect support for DRAM scaling in Tegra234

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Message-ID: <5fe5cd77-c82c-23f5-800f-16a7beebf26a@nvidia.com>
Date:   Fri, 13 Jan 2023 18:05:15 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <treding@...dia.com>,
        <krzysztof.kozlowski@...aro.org>, <dmitry.osipenko@...labora.com>,
        <viresh.kumar@...aro.org>, <rafael@...nel.org>,
        <jonathanh@...dia.com>, <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     <sanjayc@...dia.com>, <ksitaraman@...dia.com>, <ishah@...dia.com>,
        <bbasu@...dia.com>, Sumit Gupta <sumitg@...dia.com>
Subject: Re: [Patch v1 01/10] memory: tegra: add interconnect support for DRAM
 scaling in Tegra234



On 22/12/22 21:26, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
> 
> 
> 21.12.2022 22:20, Dmitry Osipenko пишет:
>> 20.12.2022 19:02, Sumit Gupta пишет:
>>> +static int tegra_emc_icc_set_bw(struct icc_node *src, struct icc_node *dst)
>>> +{
>>> +    struct tegra186_emc *emc = to_tegra186_emc(dst->provider);
>>> +    struct tegra_mc *mc = dev_get_drvdata(emc->dev->parent);
>>> +    struct mrq_bwmgr_int_request bwmgr_req = { 0 };
>>> +    struct mrq_bwmgr_int_response bwmgr_resp = { 0 };
>>> +    struct tegra_icc_node *tnode = mc->curr_tnode;
>>> +    struct tegra_bpmp_message msg;
>>> +    int ret = 0;
>>> +
>>> +    /*
>>> +     * Same Src and Dst node will happen during boot from icc_node_add().
>>> +     * This can be used to pre-initialize and set bandwidth for all clients
>>> +     * before their drivers are loaded. We are skipping this case as for us,
>>> +     * the pre-initialization already happened in Bootloader(MB2) and BPMP-FW.
>>> +     */
>>> +    if (src->id == dst->id)
>>> +            return 0;
>>> +
>>> +    if (mc->curr_tnode->type == TEGRA_ICC_NISO)
>>
>> The mc->curr_tnode usage looks suspicious, why you can't use src node?
>>
> 
> This function sets memory BW for a memory client and not for EMC.
> Apparently, you should move the BW setting to tegra234_mc_icc_set() and
> then tegra_emc_icc_set_bw() will be a noop.
> 
Yes, will move this code to set_bw() in MC driver. The set_bw call in 
EMC will be a dummy function after change.
This change will also help to remove "struct tegra_icc_node 
*curr_tnode;" from "struct tegra_mc" which is used for passing data 
between MC and EMC drivers to transfer to BPMP.

static int tegra_emc_icc_set_bw(struct icc_node *src, struct icc_node *dst)
{
         return 0;
}