linux-kernel - Re: [PATCH v10 2/5] iommu/arm-smmu: ioremap smmu mmio region before implementation init

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Date:   Wed, 8 Jul 2020 13:05:32 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Krishna Reddy <vdumpa@...dia.com>, <joro@...tes.org>,
        <will@...nel.org>, <robin.murphy@....com>, <robh+dt@...nel.org>,
        <treding@...dia.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <yhsu@...dia.com>,
        <snikam@...dia.com>, <praithatha@...dia.com>, <talho@...dia.com>,
        <bbiswas@...dia.com>, <mperttunen@...dia.com>,
        <nicolinc@...dia.com>, <bhuntsman@...dia.com>,
        <nicoleotsuka@...il.com>
Subject: Re: [PATCH v10 2/5] iommu/arm-smmu: ioremap smmu mmio region before
 implementation init


On 08/07/2020 06:00, Krishna Reddy wrote:
> ioremap smmu mmio region before calling into implementation init.
> This is necessary to allow mapped address available during vendor
> specific implementation init.
> 
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
>  drivers/iommu/arm-smmu.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index d2054178df35..e03e873d3bca 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -2120,10 +2120,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
>  	if (err)
>  		return err;
>  
> -	smmu = arm_smmu_impl_init(smmu);
> -	if (IS_ERR(smmu))
> -		return PTR_ERR(smmu);
> -
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	ioaddr = res->start;
>  	smmu->base = devm_ioremap_resource(dev, res);
> @@ -2135,6 +2131,10 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
>  	 */
>  	smmu->numpage = resource_size(res);
>  
> +	smmu = arm_smmu_impl_init(smmu);
> +	if (IS_ERR(smmu))
> +		return PTR_ERR(smmu);
> +
>  	num_irqs = 0;
>  	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) {
>  		num_irqs++;
> 


Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Thanks!
Jon

-- 
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