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Message-ID: <47c70fb9-144b-45ce-9670-85f2ec6744f5@arm.com>
Date: Wed, 13 Mar 2024 10:05:12 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
linux-arm-kernel@...ts.infradead.org
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
Sudeep Holla <sudeep.holla@....com>, Mike Leach <mike.leach@...aro.org>,
James Clark <james.clark@....com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V6 07/11] coresight: catu: Move ACPI support from AMBA
driver to platform driver
On 3/12/24 20:35, Suzuki K Poulose wrote:
> On 12/03/2024 10:23, Anshuman Khandual wrote:
>> Add support for the catu devices in a new platform driver, which can then
>> be used on ACPI based platforms. This change would now allow runtime power
>> management for ACPI based systems. The driver would try to enable the APB
>> clock if available. But first this renames and then refactors catu_probe()
>> and catu_remove(), making sure it can be used both for platform and AMBA
>> drivers. This also moves pm_runtime_put() from catu_probe() to the callers.
>>
>> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
>> Cc: Sudeep Holla <sudeep.holla@....com>
>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>> Cc: Mike Leach <mike.leach@...aro.org>
>> Cc: James Clark <james.clark@....com>
>> Cc: linux-acpi@...r.kernel.org
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-kernel@...r.kernel.org
>> Cc: coresight@...ts.linaro.org
>> Acked-by: Sudeep Holla <sudeep.holla@....com> # For ACPI related changes
>> Reviewed-by: James Clark <james.clark@....com>
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>> Changes in V6:
>>
>> - Added clk_put() for pclk in catu_platform_probe() error path
>> - Added WARN_ON(!drvdata) check in catu_platform_remove()
>> - Added additional elements for acpi_device_id[]
>>
>> drivers/acpi/arm64/amba.c | 1 -
>> drivers/hwtracing/coresight/coresight-catu.c | 146 ++++++++++++++++---
>> drivers/hwtracing/coresight/coresight-catu.h | 1 +
>> 3 files changed, 125 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c
>> index afb6afb66967..587061b0fd2f 100644
>> --- a/drivers/acpi/arm64/amba.c
>> +++ b/drivers/acpi/arm64/amba.c
>> @@ -27,7 +27,6 @@ static const struct acpi_device_id amba_id_list[] = {
>> {"ARMHC503", 0}, /* ARM CoreSight Debug */
>> {"ARMHC979", 0}, /* ARM CoreSight TPIU */
>> {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
>> - {"ARMHC9CA", 0}, /* ARM CoreSight CATU */
>> {"", 0},
>> };
>> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
>> index 3949ded0d4fa..8fa035e5a0e8 100644
>> --- a/drivers/hwtracing/coresight/coresight-catu.c
>> +++ b/drivers/hwtracing/coresight/coresight-catu.c
>> @@ -7,6 +7,8 @@
>> * Author: Suzuki K Poulose <suzuki.poulose@....com>
>> */
>> +#include <linux/platform_device.h>
>> +#include <linux/acpi.h>
>
> minor nit: Please retain the alphabetic order.
Sure, will do that.
>
>> #include <linux/amba/bus.h>
>> #include <linux/device.h>
>> #include <linux/dma-mapping.h>
>> @@ -502,31 +504,25 @@ static const struct coresight_ops catu_ops = {
>> .helper_ops = &catu_helper_ops,
>> };
>> -static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>> +static int __catu_probe(struct device *dev, struct resource *res)
>> {
>> int ret = 0;
>> u32 dma_mask;
>> - struct catu_drvdata *drvdata;
>> + struct catu_drvdata *drvdata = dev_get_drvdata(dev);
>> struct coresight_desc catu_desc;
>> struct coresight_platform_data *pdata = NULL;
>> - struct device *dev = &adev->dev;
>> void __iomem *base;
>> catu_desc.name = coresight_alloc_device_name(&catu_devs, dev);
>> if (!catu_desc.name)
>> return -ENOMEM;
>> - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>> - if (!drvdata) {
>> - ret = -ENOMEM;
>> - goto out;
>> - }
>> -
>> - dev_set_drvdata(dev, drvdata);
>> - base = devm_ioremap_resource(dev, &adev->res);
>> - if (IS_ERR(base)) {
>> - ret = PTR_ERR(base);
>> - goto out;
>> + if (res) {
>
> We don't have a case where res == NULL and we shouldn't support that.
Sure, will drop that here and in cpu debug driver as well.
>
>> + base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(base)) {
>> + ret = PTR_ERR(base);
>> + goto out;
>> + }
>> }
>> /* Setup dma mask for the device */
>> @@ -567,19 +563,39 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>> drvdata->csdev = coresight_register(&catu_desc);
>> if (IS_ERR(drvdata->csdev))
>> ret = PTR_ERR(drvdata->csdev);
>> - else
>> - pm_runtime_put(&adev->dev);
>> out:
>> return ret;
>> }
>> -static void catu_remove(struct amba_device *adev)
>> +static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>> +{
>> + struct catu_drvdata *drvdata;
>> + int ret;
>> +
>> + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL);
>> + if (!drvdata)
>> + return -ENOMEM;
>> +
>> + amba_set_drvdata(adev, drvdata);
>> + ret = __catu_probe(&adev->dev, &adev->res);
>> + if (!ret)
>> + pm_runtime_put(&adev->dev);
>> +
>> + return ret;
>> +}
>> +
>> +static void __catu_remove(struct device *dev)
>> {
>> - struct catu_drvdata *drvdata = dev_get_drvdata(&adev->dev);
>> + struct catu_drvdata *drvdata = dev_get_drvdata(dev);
>> coresight_unregister(drvdata->csdev);
>> }
>> +static void catu_remove(struct amba_device *adev)
>> +{
>> + __catu_remove(&adev->dev);
>> +}
>> +
>> static struct amba_id catu_ids[] = {
>> CS_AMBA_ID(0x000bb9ee),
>> {},
>> @@ -598,13 +614,99 @@ static struct amba_driver catu_driver = {
>> .id_table = catu_ids,
>> };
>> +static int catu_platform_probe(struct platform_device *pdev)
>> +{
>> + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + struct catu_drvdata *drvdata;
>> + int ret = 0;
>> +
>> + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
>> + if (!drvdata)
>> + return -ENOMEM;
>> +
>> + drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev);
>> + if (IS_ERR(drvdata->pclk))
>> + return -ENODEV;
>> +
>> + pm_runtime_get_noresume(&pdev->dev);
>> + pm_runtime_set_active(&pdev->dev);
>> + pm_runtime_enable(&pdev->dev);
>> +
>> + dev_set_drvdata(&pdev->dev, drvdata);
>> + ret = __catu_probe(&pdev->dev, res);
>> + pm_runtime_put(&pdev->dev);
>> + if (ret) {
>> + pm_runtime_disable(&pdev->dev);
>> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
>
> Here drvdata is guaranteed to be valid and the check is not required.
Sure, will drop.
>
>> + clk_put(drvdata->pclk);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int catu_platform_remove(struct platform_device *pdev)
>> +{
>> + struct catu_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
>> +
>> + if (WARN_ON(!drvdata))
>> + return -ENODEV;
>> +
>> + __catu_remove(&pdev->dev);
>> + pm_runtime_disable(&pdev->dev);
>> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
>
> Same here. Rest looks fine.
Sure, will drop.
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