linux-kernel - Re: [PATCH] pch_uart: Add MSI support

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Date:	Thu, 23 Jun 2011 09:14:52 +0900
From:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
CC:	Alan Cox <alan@...ux.intel.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pch_uart: Add MSI support

(2011/06/22 18:50), Alexander Stein wrote:
> Signed-off-by: Alexander Stein<alexander.stein@...tec-electronic.com>
> ---
>   drivers/tty/serial/pch_uart.c |   12 ++++++++++++
>   1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
> index 4652109..9db9773 100644
> --- a/drivers/tty/serial/pch_uart.c
> +++ b/drivers/tty/serial/pch_uart.c
> @@ -234,6 +234,7 @@ struct eg20t_port {
>   	int				tx_dma_use;
>   	void				*rx_buf_virt;
>   	dma_addr_t			rx_buf_dma;
> +	int				use_msi;
>   };
> 
>   /**
> @@ -1429,6 +1430,12 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
>   		goto init_port_hal_free;
>   	}
> 
> +	ret = pci_enable_msi(pdev);
> +	if (ret)
> +		priv->use_msi = 0;
> +	else
> +		priv->use_msi = 1;
> +
>   	iobase = pci_resource_start(pdev, 0);
>   	mapbase = pci_resource_start(pdev, 1);
>   	priv->mapbase = mapbase;
> @@ -1485,6 +1492,9 @@ static void pch_uart_pci_remove(struct pci_dev *pdev)
>   	struct eg20t_port *priv;
> 
>   	priv = (struct eg20t_port *)pci_get_drvdata(pdev);
> +
> +	if (priv->use_msi)
> +		pci_disable_msi(pdev);
>   	pch_uart_exit_port(priv);
>   	pci_disable_device(pdev);
>   	kfree(priv);
> @@ -1568,6 +1578,8 @@ static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
>   	return ret;
> 
>   probe_disable_device:
> +	if (priv->use_msi)
> +		pci_disable_msi(pdev);
>   	pci_disable_device(pdev);
>   probe_error:
>   	return ret;

Thank you for your updating.

-- 
tomoya
OKI SEMICONDUCTOR CO., LTD.
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