[PATCH 05/15] tty: serial: Add 8250-core based omap driver

Tony Lindgren tony at atomide.com
Fri Aug 15 14:07:16 PDT 2014

* Sebastian Andrzej Siewior <bigeasy at linutronix.de> [140815 10:46]:
> This patch provides a 8250-core based UART driver for the internal OMAP
> UART. The long term goal is to provide the same functionality as the
> current OMAP uart driver and DMA support.
> I tried to merge omap-serial code together with the 8250-core code.
> There should should be hardly a noticable difference. The trigger levels
> are different compared to omap-serial:

Nice, now it mostly works for me with off-idle too :) That is as long
as I have the DMA channels commented out in the .dts file.

And I'm still seeing an occasional hang with pstore console just

[  289.076538] In-band Error seen by MPU  at address 0
[  289.076538] ------------[ cut here ]------------
[  289.076568] WARNING: CPU: 0 PID: 99 at drivers/bus/omap_l3_smx.c:162 omap3_l3_app_irq+0xdc/0x134()
[  289.076599] Modules linked in:
[  289.076599] CPU: 0 PID: 99 Comm: test-idle-off-8 Tainted: G        W      3.16.0+ #510
[  289.076629] [<c0016c44>] (unwind_backtrace) from [<c00129c8>] (show_stack+0x20/0x24)
[  289.076660] [<c00129c8>] (show_stack) from [<c0714cd4>] (dump_stack+0x88/0xa4)

Which most likely means there's still some glitch with the
runtime PM somewhere and registers are being accessed when
not clocked. I _think_ I did not see it when I did not have
console=ttyS2,115200 in my cmdline but was using just pstore

> The device name is ttyS based instead of ttyO. If a ttyO based node name
> is required please ask udev for it. If both driver are activated (this
> and omap-serial) then this serial driver will take control over the
> device due to the link order

That's still not going to help with the existing kernel cmdlines
and existing installs.. I wonder if we can just do a minimal
dummy serial-omap.c that just proxies all the ttyO read/write
access to ttyS?



More information about the linux-arm-kernel mailing list