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Message-ID: <b4450fd4-677d-45a1-8627-bd0b0eb45e7e@arm.com>
Date: Wed, 13 Mar 2024 11:08:37 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Anshuman Khandual <anshuman.khandual@....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 13/03/2024 04:33, Anshuman Khandual wrote:
>
>
> 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.
This applies to almost all the drivers, so please fix it elsewhere
Suzuki
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