* Russell King - ARM Linux <[email protected]> [120208 08:10]: > Commit 2fd149645eb4 (ARM: OMAP2+: UART: Remove omap_uart_can_sleep and add > pm_qos) > has caused a regression on OMAP3 platforms. > > When the UART is trying to transmit data, if we enter a low power mode, > transmission stops, which makes serial on OMAP3 unusable - a 'dmesg' > takes five minutes to be output at 115200 baud, at a rate of around a > block of 16 characters every couple of seconds. > > Unfortunately, the commit above can't be reverted because of many other > changes in this area, so this implements a dirty fix by disabling > CPU idle in the places the original commit does, irrespective of the > UART state. ...
> --- a/arch/arm/mach-omap2/pm34xx.c > +++ b/arch/arm/mach-omap2/pm34xx.c > @@ -421,7 +421,7 @@ static void omap3_pm_idle(void) > local_irq_disable(); > local_fiq_disable(); > > - if (omap_irq_pending() || need_resched()) > + if (omap_irq_pending() || need_resched() || 1) > goto out; > > trace_power_start(POWER_CSTATE, 1, smp_processor_id()); Argh, this is just too ugly. There has got to be a better fix for the -rc series. Looks like the patches to fix omap-serial.c are queued for v3.4, so that won't help. Kevin, what do you have for the -rc fix here to avoid the if (1) hack? Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
