linux-kernel - Re: [PATCH] iommu: dart: Use readl instead of readl

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Message-ID: <ZWN4OHtr-c4XzOFL@blossom>
Date:   Sun, 26 Nov 2023 12:54:16 -0400
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Hector Martin <marcan@...can.st>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: dart: Use readl instead of readl_relaxed for
 consistency

r-b

On Sun, Nov 26, 2023 at 05:20:09PM +0100, Sven Peter wrote:
> While the readl_relaxed in apple_dart_suspend is correct the rest of the
> driver uses the non-relaxed variants everywhere and the single
> readl_relaxed is inconsistent and possibly confusing.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
>  drivers/iommu/apple-dart.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
> index 59cf256bf40f..c7f047ce0a7a 100644
> --- a/drivers/iommu/apple-dart.c
> +++ b/drivers/iommu/apple-dart.c
> @@ -1272,7 +1272,7 @@ static __maybe_unused int apple_dart_suspend(struct device *dev)
>  	unsigned int sid, idx;
>  
>  	for (sid = 0; sid < dart->num_streams; sid++) {
> -		dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(dart, sid));
> +		dart->save_tcr[sid] = readl(dart->regs + DART_TCR(dart, sid));
>  		for (idx = 0; idx < dart->hw->ttbr_count; idx++)
>  			dart->save_ttbr[sid][idx] =
>  				readl(dart->regs + DART_TTBR(dart, sid, idx));
> -- 
> 2.34.1
>