linux-kernel - Re: [PATCH 1/2] remoteproc: ingenic: Move clock handling to prepare/unprepare callbacks

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Date:   Wed, 1 Jul 2020 16:27:24 -0500
From:   Suman Anna <s-anna@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>, <ohad@...ery.com>,
        <bjorn.andersson@...aro.org>, <paul@...pouillou.net>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] remoteproc: ingenic: Move clock handling to
 prepare/unprepare callbacks

Hi Mathieu,

On 6/30/20 11:31 AM, Mathieu Poirier wrote:
> This patch moves clock related operations to the remoteproc prepare()
> and unprepare() callbacks so that the PM runtime framework doesn't
> have to be involved needlessly.  This provides a simpler approach and
> requires less code.
> 
> Based on the work from Paul Cercueil published here:
> https://lore.kernel.org/linux-remoteproc/20191116170846.67220-4-paul@crapouillou.net/
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>   drivers/remoteproc/ingenic_rproc.c | 84 +++++++++---------------------
>   1 file changed, 26 insertions(+), 58 deletions(-)
> 
> diff --git a/drivers/remoteproc/ingenic_rproc.c b/drivers/remoteproc/ingenic_rproc.c
> index 189020d77b25..b0fc8eace6ec 100644
> --- a/drivers/remoteproc/ingenic_rproc.c
> +++ b/drivers/remoteproc/ingenic_rproc.c
> @@ -11,7 +11,6 @@
>   #include <linux/io.h>
>   #include <linux/module.h>
>   #include <linux/platform_device.h>
> -#include <linux/pm_runtime.h>
>   #include <linux/remoteproc.h>
>   
>   #include "remoteproc_internal.h"
> @@ -62,6 +61,28 @@ struct vpu {
>   	struct device *dev;
>   };
>   
> +static int ingenic_rproc_prepare(struct rproc *rproc)
> +{
> +	struct vpu *vpu = rproc->priv;
> +	int ret;
> +
> +	/* The clocks must be enabled for the firmware to be loaded in TCSM */
> +	ret = clk_bulk_prepare_enable(ARRAY_SIZE(vpu->clks), vpu->clks);
> +	if (ret)
> +		dev_err(vpu->dev, "Unable to start clocks: %d", ret);

Minor nit, add a newline character at the end of the trace statement.

With that,
Reviewed-by: Suman Anna <s-anna@...com>

> +
> +	return ret;
> +}
> +
> +static int ingenic_rproc_unprepare(struct rproc *rproc)
> +{
> +	struct vpu *vpu = rproc->priv;
> +
> +	clk_bulk_disable_unprepare(ARRAY_SIZE(vpu->clks), vpu->clks);
> +
> +	return 0;
> +}
> +
>   static int ingenic_rproc_start(struct rproc *rproc)
>   {
>   	struct vpu *vpu = rproc->priv;
> @@ -115,6 +136,8 @@ static void *ingenic_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
>   }
>   
>   static struct rproc_ops ingenic_rproc_ops = {
> +	.prepare = ingenic_rproc_prepare,
> +	.unprepare = ingenic_rproc_unprepare,
>   	.start = ingenic_rproc_start,
>   	.stop = ingenic_rproc_stop,
>   	.kick = ingenic_rproc_kick,
> @@ -135,16 +158,6 @@ static irqreturn_t vpu_interrupt(int irq, void *data)
>   	return rproc_vq_interrupt(rproc, vring);
>   }
>   
> -static void ingenic_rproc_disable_clks(void *data)
> -{
> -	struct vpu *vpu = data;
> -
> -	pm_runtime_resume(vpu->dev);
> -	pm_runtime_disable(vpu->dev);
> -
> -	clk_bulk_disable_unprepare(ARRAY_SIZE(vpu->clks), vpu->clks);
> -}
> -
>   static int ingenic_rproc_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> @@ -206,35 +219,13 @@ static int ingenic_rproc_probe(struct platform_device *pdev)
>   
>   	disable_irq(vpu->irq);
>   
> -	/* The clocks must be enabled for the firmware to be loaded in TCSM */
> -	ret = clk_bulk_prepare_enable(ARRAY_SIZE(vpu->clks), vpu->clks);
> -	if (ret) {
> -		dev_err(dev, "Unable to start clocks\n");
> -		return ret;
> -	}
> -
> -	pm_runtime_irq_safe(dev);
> -	pm_runtime_set_active(dev);
> -	pm_runtime_enable(dev);
> -	pm_runtime_get_sync(dev);
> -	pm_runtime_use_autosuspend(dev);
> -
> -	ret = devm_add_action_or_reset(dev, ingenic_rproc_disable_clks, vpu);
> -	if (ret) {
> -		dev_err(dev, "Unable to register action\n");
> -		goto out_pm_put;
> -	}
> -
>   	ret = devm_rproc_add(dev, rproc);
>   	if (ret) {
>   		dev_err(dev, "Failed to register remote processor\n");
> -		goto out_pm_put;
> +		return ret;
>   	}
>   
> -out_pm_put:
> -	pm_runtime_put_autosuspend(dev);
> -
> -	return ret;
> +	return 0;
>   }
>   
>   static const struct of_device_id ingenic_rproc_of_matches[] = {
> @@ -243,33 +234,10 @@ static const struct of_device_id ingenic_rproc_of_matches[] = {
>   };
>   MODULE_DEVICE_TABLE(of, ingenic_rproc_of_matches);
>   
> -static int __maybe_unused ingenic_rproc_suspend(struct device *dev)
> -{
> -	struct vpu *vpu = dev_get_drvdata(dev);
> -
> -	clk_bulk_disable(ARRAY_SIZE(vpu->clks), vpu->clks);
> -
> -	return 0;
> -}
> -
> -static int __maybe_unused ingenic_rproc_resume(struct device *dev)
> -{
> -	struct vpu *vpu = dev_get_drvdata(dev);
> -
> -	return clk_bulk_enable(ARRAY_SIZE(vpu->clks), vpu->clks);
> -}
> -
> -static const struct dev_pm_ops __maybe_unused ingenic_rproc_pm = {
> -	SET_RUNTIME_PM_OPS(ingenic_rproc_suspend, ingenic_rproc_resume, NULL)
> -};
> -
>   static struct platform_driver ingenic_rproc_driver = {
>   	.probe = ingenic_rproc_probe,
>   	.driver = {
>   		.name = "ingenic-vpu",
> -#ifdef CONFIG_PM
> -		.pm = &ingenic_rproc_pm,
> -#endif
>   		.of_match_table = ingenic_rproc_of_matches,
>   	},
>   };
>