On 03/04/2011 02:10 AM, Linus Walleij wrote:
2010/12/20 Stephen Boyd<sboyd@xxxxxxxxxxxxxx>:
These patches fix the udelay() issue pointed out on
arm-lkml[1][2]. A quick recap: some SMP machines can scale
their CPU frequencies independent of one another. loops_per_jiffy
is calibrated globally and used in __const_udelay(). If one CPU
is running faster than what the loops_per_jiffy is calculated
(or scaled) for, udelay() will be incorrect and not wait long
enough (or too long). A similar problem occurs if the cpu
frequency is scaled during a udelay() call.
Hwt's happening to this patch set? We have applied it and
implemented a timer for the U8500.
Tested-by: Linus Walleij<linus.walleij@xxxxxxxxxx>
Mattias WALLIN can probably also provide a Tested-by:
from ST-Ericsson if it helps.
Generally I think this is good and important stuff that should
be merged, will you be submitting it to Russells patch tracker
or pull request for 2.6.39?
Thanks for testing and reporting it Linus. We are certainly interested
in getting this in. If I'm not mistaken, the last time we sent it out,
there was a C vs. assembly argument and got side tracked or no one acked
or responded to it. Will try to send out the patches again within the
next few weeks.
Thanks,
Saravana
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
--
To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
