Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-29 Thread Hans-Christian Egtvedt
Around Wed 29 Jul 2015 17:09:59 +0200 or thereabout, Nicolas Ferre wrote: > Le 29/07/2015 16:51, Andy Shevchenko a écrit : >> On Thu, Jul 2, 2015 at 4:18 PM, Cyrille Pitchen >> wrote: >>> Depending on the hardware, TX and RX FIFOs may be available. The RX >>> FIFO can avoid receive overruns,

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-29 Thread Alexandre Belloni
Hi Andy, On 29/07/2015 at 17:51:38 +0300, Andy Shevchenko wrote : > On Thu, Jul 2, 2015 at 4:18 PM, Cyrille Pitchen > wrote: > > Depending on the hardware, TX and RX FIFOs may be available. The RX > > FIFO can avoid receive overruns, especially when DMA transfers are > > not used to read data

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-29 Thread Andy Shevchenko
On Thu, Jul 2, 2015 at 4:18 PM, Cyrille Pitchen wrote: > Depending on the hardware, TX and RX FIFOs may be available. The RX > FIFO can avoid receive overruns, especially when DMA transfers are > not used to read data from the Receive Holding Register. For heavy > system load, The CPU is likely

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-29 Thread Hans-Christian Egtvedt
Around Wed 29 Jul 2015 17:09:59 +0200 or thereabout, Nicolas Ferre wrote: Le 29/07/2015 16:51, Andy Shevchenko a écrit : On Thu, Jul 2, 2015 at 4:18 PM, Cyrille Pitchen cyrille.pitc...@atmel.com wrote: Depending on the hardware, TX and RX FIFOs may be available. The RX FIFO can avoid receive

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-29 Thread Andy Shevchenko
On Thu, Jul 2, 2015 at 4:18 PM, Cyrille Pitchen cyrille.pitc...@atmel.com wrote: Depending on the hardware, TX and RX FIFOs may be available. The RX FIFO can avoid receive overruns, especially when DMA transfers are not used to read data from the Receive Holding Register. For heavy system

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-29 Thread Alexandre Belloni
Hi Andy, On 29/07/2015 at 17:51:38 +0300, Andy Shevchenko wrote : On Thu, Jul 2, 2015 at 4:18 PM, Cyrille Pitchen cyrille.pitc...@atmel.com wrote: Depending on the hardware, TX and RX FIFOs may be available. The RX FIFO can avoid receive overruns, especially when DMA transfers are not

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-20 Thread Nicolas Ferre
Le 02/07/2015 15:18, Cyrille Pitchen a écrit : > Depending on the hardware, TX and RX FIFOs may be available. The RX > FIFO can avoid receive overruns, especially when DMA transfers are > not used to read data from the Receive Holding Register. For heavy > system load, The CPU is likely not be

Re: [PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-20 Thread Nicolas Ferre
Le 02/07/2015 15:18, Cyrille Pitchen a écrit : Depending on the hardware, TX and RX FIFOs may be available. The RX FIFO can avoid receive overruns, especially when DMA transfers are not used to read data from the Receive Holding Register. For heavy system load, The CPU is likely not be able to

[PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-02 Thread Cyrille Pitchen
Depending on the hardware, TX and RX FIFOs may be available. The RX FIFO can avoid receive overruns, especially when DMA transfers are not used to read data from the Receive Holding Register. For heavy system load, The CPU is likely not be able to fetch data fast enough from the RHR. In addition,

[PATCH v4 4/5] tty/serial: at91: add support to FIFOs

2015-07-02 Thread Cyrille Pitchen
Depending on the hardware, TX and RX FIFOs may be available. The RX FIFO can avoid receive overruns, especially when DMA transfers are not used to read data from the Receive Holding Register. For heavy system load, The CPU is likely not be able to fetch data fast enough from the RHR. In addition,