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

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Message-Id: <1308736219-19975-1-git-send-email-alexander.stein@systec-electronic.com>
Date:	Wed, 22 Jun 2011 11:50:19 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tomoya MORINAGA <tomoya-linux@....okisemi.com>,
	Alexander Stein <alexander.stein@...tec-electronic.com>
Subject: [PATCH] pch_uart: Add MSI support

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;
-- 
1.7.3.4

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