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

From: Frieder Schrempf <frieder.schrempf@kontron.de>
To: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>,
	robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de
Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
	p.zabel@pengutronix.de, l.stach@pengutronix.de, krzk@kernel.org,
	agx@sigxcpu.org, marex@denx.de, andrew.smirnov@gmail.com,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, ping.bai@nxp.com,
	aford173@gmail.com, abel.vesa@nxp.com
Subject: Re: [PATCH 02/16] soc: imx: gpcv2: move domain mapping to domain driver probe
Date: Mon, 3 May 2021 15:27:46 +0200	[thread overview]
Message-ID: <6c4e6934-c0f0-7838-4dbc-3a639dfd06d0@kontron.de> (raw)
In-Reply-To: <20210429073050.21039-3-peng.fan@oss.nxp.com>

On 29.04.21 09:30, Peng Fan (OSS) wrote:
> From: Lucas Stach <l.stach@pengutronix.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@pengutronix.de>

Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.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;
> 

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