linux-kernel - Re: [PATCHv4 2/3] tty/serial: at91: fix hardware handshake with GPIOs

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Message-ID: <CACQ1gAg21UEeyT_yGed58HB1gkwfg4LA8u5AVMkKsY=d5-EbMQ@mail.gmail.com>
Date:   Fri, 30 Sep 2016 13:45:47 +0200
From:   Richard Genoud <richard.genoud@...il.com>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv4 2/3] tty/serial: at91: fix hardware handshake with GPIOs

2016-09-30 13:16 GMT+02:00 Alexandre Belloni
<alexandre.belloni@...e-electrons.com>:
> On 30/09/2016 at 13:04:28 +0200, Richard Genoud wrote :
>> Anyway, the problematics setups are all the setups with USMODE_HWHS
>> enabled on platform without Fifos or PDC,
>> i.e. all platforms but sama5d2 (Cyrille, correct me if I'm wrong).
>>
>
> This is a wrong assumption, at91rm9200 to at91sam9g45 all have a pdc.
> Please, don't break those platforms.
>
> The only affected platforms are sam9x5, sama5d3 and sama5d4.
Have you tested them ?

And why are you saying that rm9200 and g45 will be broken with this patch ?
If they have a pdc, they will fall in the case:
(atmel_use_pdc_rx(port) || atmel_use_fifo(port))
and thus use:
mode |= ATMEL_US_USMODE_HWHS;

won't they ?