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Date: Mon, 16 Aug 2021 23:13:05 +0530
From: okukatla@...eaurora.org
To: Alex Elder <elder@...aro.org>
Cc: georgi.djakov@...aro.org, bjorn.andersson@...aro.org,
evgreen@...gle.com, Andy Gross <agross@...nel.org>,
Georgi Djakov <djakov@...nel.org>,
linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, sboyd@...nel.org,
mdtipton@...eaurora.org, sibis@...eaurora.org,
saravanak@...gle.com, seansw@....qualcomm.com,
linux-arm-msm-owner@...r.kernel.org
Subject: Re: [v6 2/3] interconnect: qcom: Add EPSS L3 support on SC7280
On 2021-08-10 18:16, Alex Elder wrote:
> On 8/10/21 1:46 AM, Odelu Kukatla wrote:
>> Add Epoch Subsystem (EPSS) L3 interconnect provider support on
>> SC7280 SoCs.
>>
>> Signed-off-by: Odelu Kukatla <okukatla@...eaurora.org>
>
> I don't have much to say about what this is doing but I
> have a few suggestions.
>
> -Alex
>
Thanks for review Alex!
>> ---
>> drivers/interconnect/qcom/osm-l3.c | 136
>> +++++++++++++++++++++++++++++++------
>> drivers/interconnect/qcom/sc7280.h | 10 +++
>> 2 files changed, 125 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/interconnect/qcom/osm-l3.c
>> b/drivers/interconnect/qcom/osm-l3.c
>> index c7af143..3b16e73 100644
>> --- a/drivers/interconnect/qcom/osm-l3.c
>> +++ b/drivers/interconnect/qcom/osm-l3.c
>> @@ -9,12 +9,14 @@
>> #include <linux/io.h>
>> #include <linux/kernel.h>
>> #include <linux/module.h>
>> +#include <linux/of_address.h>
>> #include <linux/of_device.h>
>> #include <linux/platform_device.h>
>> #include <dt-bindings/interconnect/qcom,osm-l3.h>
>> #include "sc7180.h"
>> +#include "sc7280.h"
>> #include "sc8180x.h"
>> #include "sdm845.h"
>> #include "sm8150.h"
>> @@ -33,17 +35,33 @@
>> /* EPSS Register offsets */
>> #define EPSS_LUT_ROW_SIZE 4
>> +#define EPSS_REG_L3_VOTE 0x90
>> #define EPSS_REG_FREQ_LUT 0x100
>> #define EPSS_REG_PERF_STATE 0x320
>> +#define EPSS_CORE_OFFSET 0x4
>> +#define EPSS_L3_VOTE_REG(base, cpu)\
>> + (((base) + EPSS_REG_L3_VOTE) +\
>> + ((cpu) * EPSS_CORE_OFFSET))
>> -#define OSM_L3_MAX_LINKS 1
>> +#define L3_DOMAIN_CNT 4
>> +#define L3_MAX_LINKS 9
>
> It may not matter much, but if you specified the
> qcom_osm_l3_node->links[] field as the last field
> in the structure, I think it could be a flexible
> array and you wouldn't have to specify the maximum
> number of links. (You are already using the actual
> array size to set ->num_links in __DEFINE_QNODE().)
>
I will address this in next revision, will see if we can move it to
flexible array.
>> #define to_osm_l3_provider(_provider) \
>> container_of(_provider, struct qcom_osm_l3_icc_provider, provider)
>> +/**
>> + * @domain_base: an array of base address for each clock domain
>> + * @max_state: max supported frequency level
>> + * @per_core_dcvs: flag used to indicate whether the frequency
>> scaling
>> + * for each core is enabled
>> + * @reg_perf_state: requested frequency level
>> + * @lut_tables: an array of supported frequency levels
>> + * @provider: interconnect provider of this node
>> + */
>
> Run this to check your kernel doc validity:
> scripts/kernel-doc -none <file> [<file>...]
>
Done!
>> struct qcom_osm_l3_icc_provider {
>> - void __iomem *base;
>> + void __iomem *domain_base[L3_DOMAIN_CNT];
>> unsigned int max_state;
>> + bool per_core_dcvs;
>> unsigned int reg_perf_state;
>> unsigned long lut_tables[LUT_MAX_ENTRIES];
>> struct icc_provider provider;
>
> . . .
>
>> @@ -235,12 +322,17 @@ static int qcom_osm_l3_probe(struct
>> platform_device *pdev)
>> if (!qp)
>> return -ENOMEM;
>> - qp->base = devm_platform_ioremap_resource(pdev, 0);
>> - if (IS_ERR(qp->base))
>> - return PTR_ERR(qp->base);
>> + while (of_get_address(pdev->dev.of_node, i++, NULL, NULL))
>> + nr_domain_bases++;
>
> Maybe you could combine these two loops by counting as you go.
> I.e.:
>
> i = 0;
> while (true) {
> void __iomem *base;
>
> if (of_get_address(pdev->dev.of_node, i, NULL, NULL))
> break;
> base = devm_platform_ioremap_resource(pdev, i);
> if (IS_ERR(base))
> return PTR_ERR(base);
> qp->domain_base[i++] = base
> }
> nr_domain_bases = i;
>
Not exactly as above, but will merge these two loops.
>> +
>> + for (i = 0; i < nr_domain_bases ; i++) {
>> + qp->domain_base[i] = devm_platform_ioremap_resource(pdev, i);
>> + if (IS_ERR(qp->domain_base[i]))
>> + return PTR_ERR(qp->domain_base[i]);
>> + }
>> /* HW should be in enabled state to proceed */
>> - if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
>> + if (!(readl_relaxed(qp->domain_base[0] + REG_ENABLE) & 0x1)) {
>> dev_err(&pdev->dev, "error hardware not enabled\n");
>> return -ENODEV;
>> }
>> @@ -252,7 +344,7 @@ static int qcom_osm_l3_probe(struct
>> platform_device *pdev)
>> qp->reg_perf_state = desc->reg_perf_state;
>> for (i = 0; i < LUT_MAX_ENTRIES; i++) {
>> - info = readl_relaxed(qp->base + desc->reg_freq_lut +
>> + info = readl_relaxed(qp->domain_base[0] + desc->reg_freq_lut +
>> i * desc->lut_row_size);
>
> Maybe you could define a macro to encapsulate computing this
> register offset, along the lines of EPSS_L3_VOTE_REG(). (Here
> and elsewhere.)
>
This register OFFSET calculation is here only, will keep this code as
is.
>> src = FIELD_GET(LUT_SRC, info);
>> lval = FIELD_GET(LUT_L_VAL, info);
>> @@ -271,6 +363,7 @@ static int qcom_osm_l3_probe(struct
>> platform_device *pdev)
>> prev_freq = freq;
>> }
>> qp->max_state = i;
>> + qp->per_core_dcvs = desc->per_core_dcvs;
>> qnodes = desc->nodes;
>> num_nodes = desc->num_nodes;
>> @@ -326,6 +419,7 @@ static int qcom_osm_l3_probe(struct
>> platform_device *pdev)
>> static const struct of_device_id osm_l3_of_match[] = {
>> { .compatible = "qcom,sc7180-osm-l3", .data = &sc7180_icc_osm_l3 },
>> + { .compatible = "qcom,sc7280-epss-l3", .data = &sc7280_icc_epss_l3
>> },
>> { .compatible = "qcom,sdm845-osm-l3", .data = &sdm845_icc_osm_l3 },
>> { .compatible = "qcom,sm8150-osm-l3", .data = &sm8150_icc_osm_l3 },
>> { .compatible = "qcom,sc8180x-osm-l3", .data = &sc8180x_icc_osm_l3
>> },
>> diff --git a/drivers/interconnect/qcom/sc7280.h
>> b/drivers/interconnect/qcom/sc7280.h
>> index 175e400..5df7600 100644
>> --- a/drivers/interconnect/qcom/sc7280.h
>> +++ b/drivers/interconnect/qcom/sc7280.h
>> @@ -150,5 +150,15 @@
>> #define SC7280_SLAVE_PCIE_1 139
>> #define SC7280_SLAVE_QDSS_STM 140
>> #define SC7280_SLAVE_TCU 141
>> +#define SC7280_MASTER_EPSS_L3_APPS 142
>> +#define SC7280_SLAVE_EPSS_L3_SHARED 143
>> +#define SC7280_SLAVE_EPSS_L3_CPU0 144
>> +#define SC7280_SLAVE_EPSS_L3_CPU1 145
>> +#define SC7280_SLAVE_EPSS_L3_CPU2 146
>> +#define SC7280_SLAVE_EPSS_L3_CPU3 147
>> +#define SC7280_SLAVE_EPSS_L3_CPU4 148
>> +#define SC7280_SLAVE_EPSS_L3_CPU5 149
>> +#define SC7280_SLAVE_EPSS_L3_CPU6 150
>> +#define SC7280_SLAVE_EPSS_L3_CPU7 151
>> #endif
>>
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