linux-kernel - Re: [PATCH 3/4] serial: 8250_dw: Move 16550 compatible & LCR checks to dw8250_verify

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Date:   Tue, 28 Jun 2022 22:06:51 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] serial: 8250_dw: Move 16550 compatible & LCR checks
 to dw8250_verify_write()

On Tue, Jun 28, 2022 at 3:43 PM Ilpo Järvinen
<ilpo.jarvinen@...ux.intel.com> wrote:
>
> Rename dw8250_check_lcr() -> dw8250_verify_write() and add comment.
> Move LCR and 16550_compatible checks there. As offset is now passed and
> dw8250_verify_write() ensures it's UART_LCR, offset can use used
> instead of explicit UART_LCR.

...

> +/*
> + * DW UART can be configured to indicate BUSY in USR (with
> + * UART_16550_COMPATIBLE=NO or version prior to introducing that option).
> + * If BUSY is set while writing to LCR register, the write is ignored and
> + * needs to be retries.

retried

> + */


-- 
With Best Regards,
Andy Shevchenko