linux-kernel - Re: [PATCH v3] serial: samsung: Re-factors UART IRQ resource for various Samsung SoC

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Message-ID: <20200706081307.GA13025@kozik-lap>
Date:   Mon, 6 Jul 2020 10:13:07 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Tamseel Shams <m.shams@...sung.com>
Cc:     kgene@...nel.org, gregkh@...uxfoundation.org, jslaby@...e.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, alim.akhtar@...sung.com
Subject: Re: [PATCH v3] serial: samsung: Re-factors UART IRQ resource for
 various Samsung SoC

On Sat, Jul 04, 2020 at 07:36:46PM +0530, Tamseel Shams wrote:
> In few older Samsung SoCs like s3c2410, s3c2412
> and s3c2440, UART IP is having 2 interrupt lines.
> However, in other SoCs like s3c6400, s5pv210,
> exynos5433, and exynos4210 UART is having only 1
> interrupt line. Due to this, "platform_get_irq(platdev, 1)"
> call in the driver gives the following warning:
> "IRQ index 1 not found" on recent platforms.
> 
> This patch re-factors the IRQ resources handling for
> each platform and hence fixing the above warnings seen
> on some platforms.
> 
> Signed-off-by: Tamseel Shams <m.shams@...sung.com>
> ---
> Removed the logic of irq_cnt and directly using
> s3c24xx_serial_has_interrupt_mask() to check for
> number of interrupt lines.
> 
>  drivers/tty/serial/samsung_tty.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 6ef614d8648c..8a955f3d8975 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -1908,10 +1908,13 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
>  	else {
>  		port->irq = ret;
>  		ourport->rx_irq = ret;
> -		ourport->tx_irq = ret + 1;
> +		if (s3c24xx_serial_has_interrupt_mask(port))
> +			ourport->tx_irq = ret;

Hi,

I don't understand: Why do you assign here the same interrupt as RX?

Best regards,
Krzysztof

> +		else
> +			ourport->tx_irq = ret + 1;
>  	}
>  
> -	ret = platform_get_irq(platdev, 1);
> +	ret = platform_get_irq_optional(platdev, 1);
>  	if (ret > 0)
>  		ourport->tx_irq = ret;
>  	/*
> -- 
> 2.17.1
>