netdev - Re: [PATCH 1/2] ARM: imx6: disable deeper idle states when FEC is active w/o HW workaround

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Date:	Thu, 16 Jun 2016 17:47:26 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Lucas Stach <l.stach@...gutronix.de>
Cc:	Shawn Guo <shawnguo@...nel.org>, Fugang Duan <fugang.duan@....com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org, kernel@...gutronix.de,
	patchwork-lst@...gutronix.de
Subject: Re: [PATCH 1/2] ARM: imx6: disable deeper idle states when FEC is active w/o HW workaround

On Wednesday, June 1, 2016 5:29:42 PM CEST Lucas Stach wrote:
> +/*
> + * i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the
> + * CPUs when they are in wait(unclocked) state. As the hardware workaround isn't
> + * applicable to all boards, disable the deeper idle state when the workaround
> + * isn't present and the FEC is in use.
> + */
> +void imx6q_cpuidle_fec_irqs_used(void)
> +{
> +       imx6q_cpuidle_driver.states[1].disabled = true;
> +}
> +
> +void imx6q_cpuidle_fec_irqs_unused(void)
> +{
> +       imx6q_cpuidle_driver.states[1].disabled = false;
> +}
> +

These functions need to be exported, I just saw a build error in
an allmodconfig test:

ERROR: "imx6q_cpuidle_fec_irqs_unused" [drivers/net/ethernet/freescale/fec.ko] undefined!
ERROR: "imx6q_cpuidle_fec_irqs_used" [drivers/net/ethernet/freescale/fec.ko] undefined!

	Arnd