linux-kernel - Re: [PATCH v3 1/5] usb: atmel_usba_udc: Rework at91sam9rl errata handling

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Date:	Mon, 12 Jan 2015 13:15:58 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	David Laight <David.Laight@...LAB.COM>
Subject: Re: [PATCH v3 1/5] usb: atmel_usba_udc: Rework at91sam9rl errata
 handling

On Mon, 2015-01-12 at 11:57 +0100, Boris Brezillon wrote:
> at91sam9rl SoC has an erratum forcing us to toggle the BIAS on USB
> suspend/resume events.
> 
> This specific handling is only activated when CONFIG_ARCH_AT91SAM9RL is
> set and this option is only set when building a non-DT kernel, which is
> problematic since non-DT support for at91sam9rl SoC has been removed.

This sentence is not entirely correct. Commit bcf8c7e7703b ("ARM: at91:
remove at91sam9rl legacy board support") actually removed the Kconfig
symbol ARCH_AT91SAM9RL entirely. So the check for CONFIG_ARCH_AT91SAM9RL
has been pointless since (next-20141110 and) v3.19-rc1. See my report at
https://lkml.org/lkml/2014/11/10/232 .

(I stumbled on this patch because I contemplated sending a patch to
simply remove the check for CONFIG_ARCH_AT91SAM9RL and the currently
useless function toggle_bias.)

> Rework the toggle_bias implementation to attach it to the "at91sam9rl-udc"
> compatible string.
> 
> Add new compatible strings to avoid executing at91sam9rl erratum handling
> on other SoCs.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>


Paul Bolle

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