Re: [PATCH] USB: serial: ftdi_sio: fix extreme low-latency setting

2017-01-25 Thread Johan Hovold
On Wed, Jan 25, 2017 at 04:42:01PM +0100, Greg Kroah-Hartman wrote: > On Wed, Jan 25, 2017 at 04:14:36PM +0100, Johan Hovold wrote: > > On Wed, Jan 25, 2017 at 04:06:47PM +0100, Greg Kroah-Hartman wrote: > > > On Wed, Jan 25, 2017 at 03:35:20PM +0100, Johan Hovold wrote: > > > > Since commit

Re: [PATCH] USB: serial: ftdi_sio: fix extreme low-latency setting

2017-01-25 Thread Greg Kroah-Hartman
On Wed, Jan 25, 2017 at 04:14:36PM +0100, Johan Hovold wrote: > On Wed, Jan 25, 2017 at 04:06:47PM +0100, Greg Kroah-Hartman wrote: > > On Wed, Jan 25, 2017 at 03:35:20PM +0100, Johan Hovold wrote: > > > Since commit 557aaa7ffab6 ("ft232: support the ASYNC_LOW_LATENCY > > > flag") the FTDI driver

RE: [PATCH] USB: serial: ftdi_sio: fix extreme low-latency setting

2017-01-25 Thread David Laight
From: Johan Hovold > Sent: 25 January 2017 14:35 > Since commit 557aaa7ffab6 ("ft232: support the ASYNC_LOW_LATENCY > flag") the FTDI driver has been using a receive latency-timer value of > 1 ms instead of the device default of 16 ms. > > The latency timer is used to periodically empty a

Re: [PATCH] USB: serial: ftdi_sio: fix extreme low-latency setting

2017-01-25 Thread Johan Hovold
On Wed, Jan 25, 2017 at 04:06:47PM +0100, Greg Kroah-Hartman wrote: > On Wed, Jan 25, 2017 at 03:35:20PM +0100, Johan Hovold wrote: > > Since commit 557aaa7ffab6 ("ft232: support the ASYNC_LOW_LATENCY > > flag") the FTDI driver has been using a receive latency-timer value of > > 1 ms instead of

Re: [PATCH] USB: serial: ftdi_sio: fix extreme low-latency setting

2017-01-25 Thread Greg Kroah-Hartman
On Wed, Jan 25, 2017 at 03:35:20PM +0100, Johan Hovold wrote: > Since commit 557aaa7ffab6 ("ft232: support the ASYNC_LOW_LATENCY > flag") the FTDI driver has been using a receive latency-timer value of > 1 ms instead of the device default of 16 ms. > > The latency timer is used to periodically

[PATCH] USB: serial: ftdi_sio: fix extreme low-latency setting

2017-01-25 Thread Johan Hovold
Since commit 557aaa7ffab6 ("ft232: support the ASYNC_LOW_LATENCY flag") the FTDI driver has been using a receive latency-timer value of 1 ms instead of the device default of 16 ms. The latency timer is used to periodically empty a non-full receive buffer, but a status header is always sent when