linux-kernel - RE: [PATCH v2 tty-next 2/3] 8250: microchip: pci1xxxx: Add rs485 support to quad-uart driver.

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Date:   Tue, 1 Nov 2022 14:53:25 +0000
From:   <Tharunkumar.Pasumarthi@...rochip.com>
To:     <ilpo.jarvinen@...ux.intel.com>,
        <Kumaravel.Thiagarajan@...rochip.com>
CC:     <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>,
        <andy.shevchenko@...il.com>, <u.kleine-koenig@...gutronix.de>,
        <johan@...nel.org>, <wander@...hat.com>,
        <etremblay@...tech-controls.com>, <macro@...am.me.uk>,
        <geert+renesas@...der.be>, <jk@...abs.org>,
        <phil.edworthy@...esas.com>, <lukas@...ner.de>,
        <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>
Subject: RE: [PATCH v2 tty-next 2/3] 8250: microchip: pci1xxxx: Add rs485
 support to quad-uart driver.

> From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Sent: Monday, October 3, 2022 2:34 PM
> To: Kumaravel Thiagarajan - I21417
> <Kumaravel.Thiagarajan@...rochip.com>
> Subject: Re: [PATCH v2 tty-next 2/3] 8250: microchip: pci1xxxx: Add rs485
> support to quad-uart driver.
> 
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> 
> > +     if (rs485->flags & SER_RS485_ENABLED) {
> > +             memset(rs485->padding, 0, sizeof(rs485->padding));
> 
> Core handles this for you.

I went through the code and it seems like this is not taken care by the core.
Do you suggest calling 'serial8250_em485_config' inside 'pci1xxxx_rs485_config' callback?
This has not been done since we do not need all the configurations done inside 'serial8250_em485_config'.

> > +             if (!(rs485->flags & SER_RS485_RTS_ON_SEND)) {
> > +                     data |= ADCL_CFG_POL_SEL;
> > +                     rs485->flags |=  SER_RS485_RTS_AFTER_SEND;
> > +             } else {
> > +                     rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
> > +             }
> 
> Core handles that flags sanitization for you.

I went through the code and it seems like this is not taken care by the core.
Do you suggest calling 'serial8250_em485_config' inside 'pci1xxxx_rs485_config' callback?
This has not been done since we do not need all the configurations done inside 'serial8250_em485_config'.

> > +     } else {
> > +             memset(rs485, 0, sizeof(*rs485));
> 
> Core handles this.

I went through the code and it seems like this is not taken care by the core.
Do you suggest calling 'serial8250_em485_config' inside 'pci1xxxx_rs485_config' callback?
This has not been done since we do not need all the configurations done inside 'serial8250_em485_config'.

> > +     writeb(data, (port->membase + ADCL_CFG_REG));
> > +     port->rs485 = *rs485;
> 
> Core handles this.

I went through the code and it seems like this is not taken care by the core.
Do you suggest calling 'serial8250_em485_config' inside 'pci1xxxx_rs485_config' callback?
This has not been done since we do not need all the configurations done inside 'serial8250_em485_config'.

Thanks,
Tharun Kumar P