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Message-ID: <2dbef82c-96a0-419f-9950-8ee4169fb634@arm.com>
Date: Tue, 12 Mar 2024 14:41:54 +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 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
Suzuki
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