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Message-ID: <bab93283-3b4a-4f39-a4a9-fee8cea1605a@arm.com>
Date: Wed, 13 Mar 2024 10:03:06 +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 06/11] coresight: funnel: Move ACPI support from AMBA
driver to platform driver
On 3/12/24 20:11, Suzuki K Poulose wrote:
> On 12/03/2024 10:23, Anshuman Khandual wrote:
>> Add support for the dynamic funnel device in the platform driver, which can
>> then be used on ACPI based platforms. This change would allow runtime power
>> management for ACPI based systems.
>>
>> The driver would try to enable the APB clock if available. Also, rename the
>> code to reflect the fact that it now handles both static and dynamic
>> funnels. But first this refactors funnel_probe() making sure it can be used
>> both for platform and AMBA drivers, by moving the pm_runtime_put() 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
>> Tested-by: Sudeep Holla <sudeep.holla@....com> # Boot and driver probe only
>> 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_disable_unprepare() for pclk in funnel_probe() error path
>> - Added WARN_ON(!drvdata) check in funnel_platform_remove()
>> - Added additional elements for acpi_device_id[]
>>
>> drivers/acpi/arm64/amba.c | 1 -
>> .../hwtracing/coresight/coresight-funnel.c | 72 ++++++++++++-------
>> 2 files changed, 48 insertions(+), 25 deletions(-)
>>
>> diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c
>> index 270f4e3819a2..afb6afb66967 100644
>> --- a/drivers/acpi/arm64/amba.c
>> +++ b/drivers/acpi/arm64/amba.c
>> @@ -28,7 +28,6 @@ static const struct acpi_device_id amba_id_list[] = {
>> {"ARMHC979", 0}, /* ARM CoreSight TPIU */
>> {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
>> {"ARMHC9CA", 0}, /* ARM CoreSight CATU */
>> - {"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */
>> {"", 0},
>> };
>> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
>> index ff3ea0670a5b..3b4be10a0f0c 100644
>> --- a/drivers/hwtracing/coresight/coresight-funnel.c
>> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
>> @@ -36,6 +36,7 @@ DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
>> * struct funnel_drvdata - specifics associated to a funnel component
>> * @base: memory mapped base address for this component.
>> * @atclk: optional clock for the core parts of the funnel.
>> + * @pclk: APB clock if present, otherwise NULL
>> * @csdev: component vitals needed by the framework.
>> * @priority: port selection order.
>> * @spinlock: serialize enable/disable operations.
>> @@ -43,6 +44,7 @@ DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
>> struct funnel_drvdata {
>> void __iomem *base;
>> struct clk *atclk;
>> + struct clk *pclk;
>> struct coresight_device *csdev;
>> unsigned long priority;
>> spinlock_t spinlock;
>> @@ -236,6 +238,10 @@ static int funnel_probe(struct device *dev, struct resource *res)
>> return ret;
>> }
>> + drvdata->pclk = coresight_get_enable_apb_pclk(dev);
>> + if (IS_ERR(drvdata->pclk))
>> + return -ENODEV;
>> +
>> /*
>> * Map the device base for dynamic-funnel, which has been
>> * validated by AMBA core.
>> @@ -272,12 +278,13 @@ static int funnel_probe(struct device *dev, struct resource *res)
>> goto out_disable_clk;
>> }
>> - pm_runtime_put(dev);
>> ret = 0;
>> out_disable_clk:
>> if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
>> clk_disable_unprepare(drvdata->atclk);
>> + if (ret && !IS_ERR_OR_NULL(drvdata->pclk))
>> + clk_disable_unprepare(drvdata->pclk);
>> return ret;
>> }
>> @@ -298,6 +305,9 @@ static int funnel_runtime_suspend(struct device *dev)
>> if (drvdata && !IS_ERR(drvdata->atclk))
>> clk_disable_unprepare(drvdata->atclk);
>> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
>> + clk_disable_unprepare(drvdata->pclk);
>> +
>> return 0;
>> }
>> @@ -308,6 +318,8 @@ static int funnel_runtime_resume(struct device *dev)
>> if (drvdata && !IS_ERR(drvdata->atclk))
>> clk_prepare_enable(drvdata->atclk);
>> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
>> + clk_prepare_enable(drvdata->pclk);
>> return 0;
>> }
>> #endif
>> @@ -316,55 +328,61 @@ static const struct dev_pm_ops funnel_dev_pm_ops = {
>> SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
>> };
>> -static int static_funnel_probe(struct platform_device *pdev)
>> +static int funnel_platform_probe(struct platform_device *pdev)
>> {
>> + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> int ret;
>> pm_runtime_get_noresume(&pdev->dev);
>> pm_runtime_set_active(&pdev->dev);
>> pm_runtime_enable(&pdev->dev);
>> - /* Static funnel do not have programming base */
>> - ret = funnel_probe(&pdev->dev, NULL);
>> -
>> - if (ret) {
>> - pm_runtime_put_noidle(&pdev->dev);
>> + ret = funnel_probe(&pdev->dev, res);
>> + pm_runtime_put(&pdev->dev);
>> + if (ret)
>> pm_runtime_disable(&pdev->dev);
>> - }
>> return ret;
>> }
>> -static void static_funnel_remove(struct platform_device *pdev)
>> +static void funnel_platform_remove(struct platform_device *pdev)
>> {
>> + struct funnel_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
>> +
>> + if (WARN_ON(!drvdata))
>> + return;
>> +
>> funnel_remove(&pdev->dev);
>> pm_runtime_disable(&pdev->dev);
>> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
>
> Same as the previous patch
Right, unlike in xxx_runtime_suspend/resume() functions, xxx_platform_remove()
functions do have a (!drvdata) check right at the beginning. Hence a redundant
check in such places can be dropped.
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