On Tue, Jul 13, 2021 at 11:54 AM Vignesh Raghavendra [off-list ref] wrote:

On 7/13/21 1:57 AM, andy@surfacebook.localdomain wrote:

quoted

Tue, Jun 22, 2021 at 11:53:38AM +0530, Vignesh Raghavendra kirjoitti:

...

quoted

https://lore.kernel.org/linux-serial/20170206233000.3021-1-dianders@chromium.org/ (local)

I am not sure if reading UART_LSR is a good idea in the above patch.
Some flags in LSR register are cleared on read (at least that's the case
for UARTs on TI SoCs) and thus can result in loss of error/FIFO status
information.

quoted

https://lore.kernel.org/linux-serial/1440015124-28393-1-git-send-email-california.l.sullivan@intel.com/ (local)

Looks like this never made it.

Forgot to react to the above. Yes, they never made it because I
believe due to the exact reason you mentioned above. Also California
set up different experiments IIRC and it shows that the problem didn;t
fully disappear with his approach. But maybe yours will work better
(at least it's not the first time I have seen it on different hardware
according to people's contributions).

-- 
With Best Regards,
Andy Shevchenko