linux-kernel - RE: [PATCH 2/3] tty: serial: lpuart: support UPIO

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Message-ID: <AM0PR04MB4481D6C5CD27F410359F53A788530@AM0PR04MB4481.eurprd04.prod.outlook.com>
Date:   Wed, 18 Dec 2019 12:26:09 +0000
From:   Peng Fan <peng.fan@....com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jslaby@...e.com" <jslaby@...e.com>
CC:     "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>, Alice Guo <alice.guo@....com>
Subject: RE: [PATCH 2/3] tty: serial: lpuart: support UPIO_MEM32 for lpuart32

Hi Greg,

> Subject: [PATCH 2/3] tty: serial: lpuart: support UPIO_MEM32 for lpuart32

This patch was sent out wrongly. Not affect the other three patches which
belongs the whole patch set described in cover-letter.

Should I sent out v2? Or you are fine if the other 3 patches are ok?

Thanks,
Peng.

> 
> From: Peng Fan <peng.fan@....com>
> 
> "earlycon" no need to specify the value string since it uses stdout-path
> parameters. However when earlycon and normal console are not using the
> same uart port, we need specify value string to earlycon, this is what we need
> to do when support dual linux using jailhouse hypervisor. The 2nd linux will
> use the uart of the 1st linux as earlycon.
> 
> earlycon=lpuart32,mmio32,0x5a060010,115200 not work for i.MX8QXP.
> It is because lpuart32_early_console_setup not support little endian.
> 
> Since the original code is to support UPIO_MEM32BE, so if not UPIO_MEM32,
> we still take it as UPIO_MEM32BE
> 
> Acked-by: Fugang Duan <fugang.duan@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/tty/serial/fsl_lpuart.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index
> 54c7735406f8..6ad0af073e62 100644
> --- a/drivers/tty/serial/fsl_lpuart.c
> +++ b/drivers/tty/serial/fsl_lpuart.c
> @@ -2376,7 +2376,9 @@ static int __init
> lpuart32_early_console_setup(struct earlycon_device *device,
>  	if (!device->port.membase)
>  		return -ENODEV;
> 
> -	device->port.iotype = UPIO_MEM32BE;
> +	if (device->port.iotype != UPIO_MEM32)
> +		device->port.iotype = UPIO_MEM32BE;
> +
>  	device->con->write = lpuart32_early_write;
>  	return 0;
>  }
> --
> 2.16.4