linux-kernel - Re: [PATCH v2 1/2] tty: serial: msm: Add mask value for UART

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5525BA68.7060602@codeaurora.org>
Date:	Wed, 08 Apr 2015 16:31:52 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Pramod Gurav <gpramod@...eaurora.org>,
	linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
CC:	gregkh@...uxfoundation.org, bryanh@...eaurora.org, jslaby@...e.cz
Subject: Re: [PATCH v2 1/2] tty: serial: msm: Add mask value for UART_DM registers

On 04/08/15 06:28, Pramod Gurav wrote:
> diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
> index b73889c..4c1e9ea 100644
> --- a/drivers/tty/serial/msm_serial.c
> +++ b/drivers/tty/serial/msm_serial.c
> @@ -432,8 +432,13 @@ static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
>  	/* RX stale watermark */
>  	rxstale = entry->rxstale;
>  	watermark = UART_IPR_STALE_LSB & rxstale;
> -	watermark |= UART_IPR_RXSTALE_LAST;
> -	watermark |= UART_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
> +	if (msm_port->is_uartdm)
> +		watermark |= UART_DM_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
> +	else {
> +		watermark |= UART_IPR_RXSTALE_LAST;
> +		watermark |= UART_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
> +	}
> +
>  	msm_write(port, watermark, UART_IPR);
>  

This could be written like so:

if (msm_port->is_uartdm) {
	mask = UART_DM_IPR_STALE_TIMEOUT_MSB;
} else {
	watermark |= UART_IPR_RXSTALE_LAST;
	mask = UART_IPR_STALE_TIMEOUT_MSB;
}

watermark |= mask & (rxstale << 2);

so that we don't duplicate the rfr_level << 2 part.

>  	/* set RX watermark */
> @@ -496,9 +501,15 @@ static int msm_startup(struct uart_port *port)
>  
>  	/* set automatic RFR level */
>  	data = msm_read(port, UART_MR1);
> -	data &= ~UART_MR1_AUTO_RFR_LEVEL1;
> +	if (msm_port->is_uartdm) {
> +		data &= ~UART_DM_MR1_AUTO_RFR_LEVEL1;
> +		data |= UART_DM_MR1_AUTO_RFR_LEVEL1 & (rfr_level << 2);
> +	} else {
> +		data &= ~UART_MR1_AUTO_RFR_LEVEL1;
> +		data |= UART_MR1_AUTO_RFR_LEVEL1 & (rfr_level << 2);
> +	}
> +
>  	data &= ~UART_MR1_AUTO_RFR_LEVEL0;
> -	data |= UART_MR1_AUTO_RFR_LEVEL1 & (rfr_level << 2);
>  	data |= UART_MR1_AUTO_RFR_LEVEL0 & rfr_level;
>  	msm_write(port, data, UART_MR1);
>  	return 0;

This could be written like so:

if (msm_port->is_uartdm)
	mask = UART_DM_MR1_AUTO_RFR_LEVEL1;
else
	mask = UART_MR1_AUTO_RFR_LEVE1;

data &= ~mask;
data &= ~UART_MR1_AUTO_RFR_LEVEL0;
data |= mask & (rfr_level << 2);
data |= UART_MR1_AUTO_RFR_LEVEL0 & rfr_level;

so that we don't duplicate the rfr_level << 2 part.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/