linux-kernel - Re: [PATCH v2] ata: add AMD Seattle platform driver

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Date:	Fri, 29 Jan 2016 21:31:27 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Brijesh Singh <brijesh.singh@....com>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org, hdegoede@...hat.com,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH v2] ata: add AMD Seattle platform driver

> For the ACPI case, I still think that an AML call from the AHCI driver
> is the most logical solution. You mentioned that you believe that calling
> into the AML interpreter up to 100 times per second is a noticeable
> overhead, but I doubt that and would like to see actual number backing
> that up. Note that most of the time, the status of the LEDs won't even
> change, so the driver does not have to call into the AML while I/O
> is in progress, or while it is stopped, only for the transition or in
> case of locate and fault events that should be extremely rare.

It can also be delayed - you don't need to adjust the LED at any great
rate - it's for a human not a machine to read.

Alan