linux-kernel - Re: [PATCH 1/2 v4] USB: serial: mos7840: Adjust port settings for read and write registers

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Date:   Wed, 5 Dec 2018 07:03:59 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Jackychou <jackychou@...x.com.tw>
Cc:     johan@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        louis@...x.com.tw
Subject: Re: [PATCH 1/2 v4] USB: serial: mos7840: Adjust port settings for
 read and write registers

On Fri, Nov 30, 2018 at 02:31:21PM +0800, Jackychou wrote:
> From: JackyChou <jackychou@...x.com.tw>
> 
> In the read/write function, set port 2 independently in the 2-port case.
> 
> When setting the offset of port registers, the offset between port 1 and
> other ports is different, so port 1 is set independently.
> Then in the rest of ports, the port 2 between 2-ports case and 4-ports case
> is different, so port 2 in 2-ports case is set independently.
> 
> Signed-off-by: JackyChou <jackychou@...x.com.tw>
> ---

Thanks for the update.

> +	} else {
> +		u8 port_offset;
> +
> +		if ((mos7840_port->port_num == 2) && (serial->num_ports == 2))
> +			port_offset = 1;
> +		else
> +			port_offset = mos7840_port->port_num - 2;
> +		mos7840_port->SpRegOffset = 0x8 + (2 * port_offset);
> +		mos7840_port->ControlRegOffset = 0x9 + (2 * port_offset);
> +		mos7840_port->DcrRegOffset = 0x16 + (3 * port_offset);

I simplified this further as:

	} else {
		u8 phy_num = mos7840_port->port_num;

		/* Port 2 in the 2-port case uses registers of port 3 */
		if (serial->num_ports == 2)
			phy_num = 3;

		mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
		mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
		mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);

before applying.

Johan