3.3-rc1 console lag (was: Re: [PATCH v8 00/20] OMAP2+: UART: Runtime adaptation + cleanup)

[Ramirez Luna, Omar]

Hi Paul,

On Wed, Jan 25, 2012 at 9:00 PM, Paul Walmsley <paul at pwsan.com> wrote:
...
>> > Ensure CONFIG_OMAP_PRM is set while testing irq_chaining with uart.
>> > And for pm_qos usage ensure CONFIG_CPU_IDLE is selected other wise
>> > console might be sluggish.
>>
>> There is console lag for omap2plus_defconfig given that
>> CONFIG_CPU_IDLE is not enabled. Is the intention to force CPU_IDLE
>> into the defconfig or find an alternative for the new pm_qos when cpu
>> idle is disabled.
>>
>> Seen on beagle-xm and 3.3-rc1.
>
> Try this
>
> http://marc.info/?l=linux-arm-kernel&m=132754676814391&w=2

I tried the series and the console returned to normal, I can confirm
that the following patch helps:

tty: serial: OMAP: use a 1-byte RX FIFO threshold in PIO mode

Thanks,

Omar