linux-kernel - Re: [PATCH 02/16] soc: imx: gpcv2: move domain mapping to domain driver probe

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Date:   Mon, 3 May 2021 15:27:46 +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 02/16] soc: imx: gpcv2: move domain mapping to domain
 driver probe

On 29.04.21 09:30, Peng Fan (OSS) wrote:
> From: Lucas Stach <l.stach@...gutronix.de>
> 
> As long as the power domain driver is active we want power control
> over the domain (which is what the mapping bit requests), so there
> is no point in whacking it for every power control action, simply
> set the bit in driver probe and clear it when the driver is removed.
> 
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>

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

> ---
>   drivers/soc/imx/gpcv2.c | 22 +++++++++++++---------
>   1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index 512e6f4acafd..552d3e6bee52 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -140,14 +140,11 @@ static int imx_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain *genpd,
>   	int i, ret = 0;
>   	u32 pxx_req;
>   
> -	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
> -			   domain->bits.map, domain->bits.map);
> -
>   	if (has_regulator && on) {
>   		ret = regulator_enable(domain->regulator);
>   		if (ret) {
>   			dev_err(domain->dev, "failed to enable regulator\n");
> -			goto unmap;
> +			return ret;
>   		}
>   	}
>   
> @@ -203,9 +200,7 @@ static int imx_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain *genpd,
>   		/* Preserve earlier error code */
>   		ret = ret ?: err;
>   	}
> -unmap:
> -	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
> -			   domain->bits.map, 0);
> +
>   	return ret;
>   }
>   
> @@ -499,10 +494,13 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>   	if (ret)
>   		return dev_err_probe(domain->dev, ret, "Failed to get domain's clocks\n");
>   
> +	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
> +			   domain->bits.map, domain->bits.map);
> +
>   	ret = pm_genpd_init(&domain->genpd, NULL, true);
>   	if (ret) {
>   		dev_err(domain->dev, "Failed to init power domain\n");
> -		goto out_put_clocks;
> +		goto out_domain_unmap;
>   	}
>   
>   	ret = of_genpd_add_provider_simple(domain->dev->of_node,
> @@ -516,7 +514,9 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>   
>   out_genpd_remove:
>   	pm_genpd_remove(&domain->genpd);
> -out_put_clocks:
> +out_domain_unmap:
> +	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
> +			   domain->bits.map, 0);
>   	imx_pgc_put_clocks(domain);
>   
>   	return ret;
> @@ -528,6 +528,10 @@ static int imx_pgc_domain_remove(struct platform_device *pdev)
>   
>   	of_genpd_del_provider(domain->dev->of_node);
>   	pm_genpd_remove(&domain->genpd);
> +
> +	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
> +			   domain->bits.map, 0);
> +
>   	imx_pgc_put_clocks(domain);
>   
>   	return 0;
>