linux-kernel - Re: [RESEND 0/3] mfd: twl6040: Updates for i2s speed and fix for chip deadlock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 24 Apr 2014 12:12:36 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<lee.jones@...aro.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<sameo@...ux.intel.com>, <nm@...com>
Subject: Re: [RESEND 0/3] mfd: twl6040: Updates for i2s speed and fix for
 chip deadlock

Lee,

On 04/01/2014 04:44 PM, Peter Ujfalusi wrote:
> Hi,
> 
> While looking into a report by Florian Vaussard [1] I have noticed couple of most
> likely unrelated issues:
> - all boards using twl6040 configures the i2c bus to 400KHz while twl6040 is set
>   to 100KHz as default.
> - if I set the audpwron GPIO high [2] in the bootloader the i2c communication towards
>   twl6040 will be broken
> - got confirmation from HW design teams that twl6040 can work on a bus with
>   400KHz even if after hard reset but it is optimal to swithc to 400KHz mode as
>   soon as possible.
> 
> The solution or these are:
> set the twl6040 to i2c fast mode with regmap patch
> Clear the INTID register right after we request the audpwron GPIO and set it to
> low.

Do you want me to resend this series again?

Thanks,
Péter

> 
> Generated on top of:
> git://git.linaro.org/people/lee.jones/mfd.git for-mfd-next
> 
> Tested on PandaBoard, PandaBoardES, OMAP4-blaze (SDP)
> 
> [1] http://www.spinics.net/lists/arm-kernel/msg310725.html
> [2] Command in u-boot to enable the audpwron on PandaBoards: gpio set 127
> 
> Regards,
> Peter
> ---
> Peter Ujfalusi (3):
>   mfd: twl6040: Select i2c fast mode as default with regmap patch
>   mfd: twl6040: Move register patching earlier in probe
>   mfd: twl6040: Clear the interrupt ID register before requesting IRQ
> 
>  drivers/mfd/twl6040.c       | 19 +++++++++++++------
>  include/linux/mfd/twl6040.h |  1 +
>  2 files changed, 14 insertions(+), 6 deletions(-)
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/