On Thu, 15 Oct 2009 16:05:13 +0200, Jean Delvare wrote: > On Thu, 15 Oct 2009 22:19:19 +1100, Benjamin Herrenschmidt wrote: > > On Thu, 2009-10-15 at 12:49 +0200, Jean Delvare wrote: > > > Oh. Well, if that was the case, we would see errors all the time, not > > > just during initialization, right? Or does the I2C clock frequency > > > change over time somehow? > > > > No but maybe we are a bit on the "limit" of the device and some > > registers take long to respond than others ? > > Unlikely. The ADT7460 can run at I2C clock rates up to 400 kHz while > the Keywest I2C runs at 25, 50 or 100 kHz if I read the code properly. > I don't know what exact speed is used on Tim's system, apparently it is > read from the hardware in the device tree directly? > > We could have low_i2c.c log the I2C clock frequency and/or try to force > the lowest speed (25 kHz) and see if it helps, but I very much doubt > it. And I'd rather wait for Tim to report the result with my last patch > first.
Ben, wouldn't this recent patch of yours be worth testing too? http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=11a50873ef2b3c1c3fe99a661c22c08f35d93553 If it solves problems at resume time, I guess it might also solve problems at boot time? -- Jean Delvare _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev