linux-kernel - Re: [PATCH 1/4] ata: ahci_platform: Add ACPI support for AMD Seattle SATA controller

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Message-ID: <542C6FE9.10903@amd.com>
Date:	Wed, 1 Oct 2014 16:19:37 -0500
From:	Suravee Suthikulanit <suravee.suthikulpanit@....com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	<catalin.marinas@....com>, <will.deacon@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-acpi@...r.kernel.org>, <mark.rutland@....com>,
	<arnd@...db.de>, <graeme.gregory@...aro.org>,
	<marc.zyngier@....com>, <rjw@...ysocki.net>,
	<linux-kernel@...r.kernel.org>, <astone@...hat.com>,
	<grant.likely@...aro.org>, <hanjun.guo@...aro.org>,
	<Sudeep.Holla@....com>, <olof@...om.net>, <jason@...edaemon.net>,
	"Duran, Leo" <leo.duran@....com>, Jon Masters <jcm@...hat.com>
Subject: Re: [PATCH 1/4] ata: ahci_platform: Add ACPI support for AMD Seattle
 SATA controller

On 9/16/2014 8:26 PM, Matthew Garrett wrote:
> On Mon, Sep 15, 2014 at 07:47:23PM -0500, suravee.suthikulpanit@....com wrote:
>> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>>
>> This patch adds ACPI match table in ahci_platform. The table includes
>> the acpi_device_id to match AMD Seattle SATA controller with following
>> asl structure in DSDT:
>>
>>      Device (SATA0)
>>      {
>>        Name(_HID, "AMDI0600")	// Seattle AHSATA
>
> There really ought to be a well-defined PNPID for AHCI, so you can _HID
> to AMD and _CID to something generic. That way we won't have:
>
>> +#ifdef CONFIG_ATA_ACPI
>> +static const struct acpi_device_id ahci_acpi_match[] = {
>> +	{ "AMDI0600", 0 }, /* AMD Seattle AHCI */
>> +	{ },
>> +};
>
> utter sadness here. Really, please don't end up in a situation where we
> need to add device-specific IDs to a generic driver.
>
Matthew,

Currently, there is no _CID defined for generic AHCI. We will work on 
proposing one, and provide update patches for including the new ID.

Thanks,
Suravee

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