linux-kernel - Re: [PATCH 8/9] ata: Add support for the Tegra124 SATA controller

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Message-ID: <53A0686F.4000303@wwwdotorg.org>
Date:	Tue, 17 Jun 2014 10:10:23 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Mikko Perttunen <mperttunen@...dia.com>
CC:	thierry.reding@...il.com, tj@...nel.org, pdeschrijver@...dia.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 8/9] ata: Add support for the Tegra124 SATA controller

On 06/17/2014 06:14 AM, Bartlomiej Zolnierkiewicz wrote:
> 
> Hi,
> 
> On Wednesday, June 04, 2014 02:32:38 PM Mikko Perttunen wrote:
>> This adds support for the integrated AHCI-compliant Serial ATA
>> controller present on the NVIDIA Tegra124 system-on-chip.

>> +static inline void sata_writel(struct tegra_ahci_priv *tegra, u32 value,
>> +				 unsigned long offset)
>> +{
>> +	writel(value, tegra->sata_regs + offset);
>> +}
>> +
>> +static inline u32 sata_readl(struct tegra_ahci_priv *tegra,
>> +				unsigned long offset)
>> +{
>> +	return readl(tegra->sata_regs + offset);
>> +}
> 
> sata_writel() and sata_read() static inlines don't seem to add any value.
> 
> Can they be removed?

Such functions are quite idiomatic in drivers, and serve to simplify all
the call-sites by removing the need to write out the addition of the
base address everywhere.

>> +static struct platform_driver tegra_ahci_driver = {
>> +	.probe = tegra_ahci_probe,
>> +	.remove = ata_platform_remove_one,
>> +	.driver = {
>> +		.name = "tegra-ahci",
>> +		.owner = THIS_MODULE,
>> +		.of_match_table = tegra_ahci_of_match,
>> +	},
> 
> This driver lacks PM suspend/resume support.  I assume that
> the Tegra124 platform also doesn't support suspend/resume yet
> (if so a comment in the driver code about this would be useful),
> otherwise the driver should be fixed.

We do have basic system suspend/resume support. However, I don't think
missing suspend/resume in an individual driver should stop it from being
merged. It can certainly be added later.
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