linux-kernel - Re: [PATCH 06/16] soc: imx: gpcv2: add runtime PM support for power-domains

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Date:   Mon, 3 May 2021 16:18:44 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        p.zabel@...gutronix.de, l.stach@...gutronix.de, krzk@...nel.org,
        agx@...xcpu.org, marex@...x.de, andrew.smirnov@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ping.bai@....com, aford173@...il.com,
        abel.vesa@....com
Subject: Re: [PATCH 06/16] soc: imx: gpcv2: add runtime PM support for
 power-domains

On 29.04.21 09:30, Peng Fan (OSS) wrote:
> From: Lucas Stach <l.stach@...gutronix.de>
> 
> This allows to nest domains into other power domains and have the
> parent domain powered up/down as required by the child domains.
> 
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>

With the fix from patch 13/16 squashed:

Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>

> ---
>   drivers/soc/imx/gpcv2.c | 18 +++++++++++++++++-
>   1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index d27025e37a9e..87165619a689 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -12,6 +12,7 @@
>   #include <linux/of_device.h>
>   #include <linux/platform_device.h>
>   #include <linux/pm_domain.h>
> +#include <linux/pm_runtime.h>
>   #include <linux/regmap.h>
>   #include <linux/regulator/consumer.h>
>   #include <linux/sizes.h>
> @@ -141,11 +142,17 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
>   	u32 reg_val;
>   	int ret;
>   
> +	ret = pm_runtime_get_sync(domain->dev);
> +	if (ret) {
> +		pm_runtime_put_noidle(domain->dev);
> +		return ret;
> +	}
> +
>   	if (!IS_ERR(domain->regulator)) {
>   		ret = regulator_enable(domain->regulator);
>   		if (ret) {
>   			dev_err(domain->dev, "failed to enable regulator\n");
> -			return ret;
> +			goto out_put_pm;
>   		}
>   	}
>   
> @@ -200,6 +207,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
>   out_regulator_disable:
>   	if (!IS_ERR(domain->regulator))
>   		regulator_disable(domain->regulator);
> +out_put_pm:
> +	pm_runtime_put(domain->dev);
>   
>   	return ret;
>   }
> @@ -262,6 +271,8 @@ static int imx_pgc_power_down(struct generic_pm_domain *genpd)
>   		}
>   	}
>   
> +	pm_runtime_put(domain->dev);
> +
>   	return 0;
>   
>   out_clk_disable:
> @@ -519,6 +530,8 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>   		return dev_err_probe(domain->dev, domain->num_clks,
>   				     "Failed to get domain's clocks\n");
>   
> +	pm_runtime_enable(domain->dev);
> +
>   	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
>   			   domain->bits.map, domain->bits.map);
>   
> @@ -542,6 +555,7 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>   out_domain_unmap:
>   	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
>   			   domain->bits.map, 0);
> +	pm_runtime_disable(domain->dev);
>   
>   	return ret;
>   }
> @@ -556,6 +570,8 @@ static int imx_pgc_domain_remove(struct platform_device *pdev)
>   	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
>   			   domain->bits.map, 0);
>   
> +	pm_runtime_disable(domain->dev);
> +
>   	return 0;
>   }
>   
>