Hi Fugang, Am Montag, den 06.06.2016, 02:00 +0000 schrieb Fugang Duan: > From: Lucas Stach <l.st...@pengutronix.de> Sent: Saturday, June 04, > 2016 12:31 AM > > > > To: Shawn Guo <shawn...@kernel.org>; Fugang Duan <fugang.duan@nxp.c > > om> > > Cc: devicet...@vger.kernel.org; patchwork-...@pengutronix.de; > > ker...@pengutronix.de; linux-arm-ker...@lists.infradead.org; > > netdev@vger.kernel.org > > Subject: [PATCH v2 1/2] ARM: imx6: disable deeper idle states when > > FEC is > > active w/o HW workaround > > > > The 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. > > > > This allows to safely run a kernel with CPUidle enabled on all > > i.MX6 boards. > > > > Signed-off-by: Lucas Stach <l.st...@pengutronix.de> > > Acked-by: David S. Miller <da...@davemloft.net> (for network > > changes) > > ---
[...] > Hi, Lucas, > > FEC irq cannot wake up CPUs when system is in wait mode. But we can > use GPIO_6 for FEC interrupt that GPIO irq wake up CPUs. > No need to disable wait mode as your such patches. > > You just config the gpio irq like below patches: > bc20a5d6da71 (ARM: dts: imx6qdl-sabreauto: use GPIO_6 for FEC > interrupt.) > 6261c4c8f13e (ARM: dts: imx6qdl-sabrelite: use GPIO_6 for FEC > interrupt.) > Please look at the description of this series again. The changes don't disable the deeper idle states on boards where the HW waorkaround is available. There is a large number of boards in the wild which can not use the HW workaround, as they use GPIO_6 for other purposes. The aim of this series is to have an automatic software workaround available for those boards. Regards, Lucas
