[PATCH 4/7] can: m_can: add a bit delay after setting CCCR_INIT bit
From: mkl@pengutronix.de (Marc Kleine-Budde)
Date: 2014-11-03 16:52:11
Also in:
linux-can, netdev
On 10/29/2014 11:45 AM, Dong Aisheng wrote:
The spec mentions there may be a delay until the value written to INIT can be read back due to the synchronization mechanism between the two clock domains. But it does not indicate the exact clock cycles needed. The 5us delay is a test value and seems ok. Without the delay, CCCR.CCE bit may fail to be set and then the initialization fail sometimes when do repeatly up and down. Signed-off-by: Dong Aisheng <redacted>
Applied to can/master. Thanks, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: OpenPGP digital signature URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20141103/634797a0/attachment.sig>