linux-kernel - Re: [RFC] tty: pl011: Work around stuck BUSY bit on QDF2400

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Date:   Tue, 31 Jan 2017 18:42:47 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Christopher Covington <cov@...eaurora.org>
Cc:     Peter Hurley <peter@...leysoftware.com>, timur@...eaurora.org,
        pelcan@...eaurora.org, nleeder@...eaurora.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [RFC] tty: pl011: Work around stuck BUSY bit on QDF2400

On Mon, Jan 30, 2017 at 06:44:17PM -0500, Christopher Covington wrote:
>  {
>  	struct uart_amba_port *uap =
>  	    container_of(port, struct uart_amba_port, port);
> -	unsigned int status = pl011_read(uap, REG_FR);
> +	unsigned int status = pl011_read(uap, REG_FR) ^ uap->vendor->inv_fr;
>  	return status & (uap->vendor->fr_busy | UART01x_FR_TXFF) ?
>  							0 : TIOCSER_TEMT;
>  }

I'd much prefer the reg & mask == val approach, but the above makes that
difficult.

So for the PL011 changes:

Acked-by: Russell King <rmk+kernel@...linux.org.uk>

Thanks.

-- 
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