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Commit aeb8a3d1 authored by Jean Delvare's avatar Jean Delvare Committed by Wolfram Sang
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i2c: i801: Check if interrupts are disabled 



There is a control bit in the PCI configuration space which disables
interrupts. If this bit is set, the driver should not try to make use
of interrupts, it won't receive any.

Signed-off-by: default avatarJean Delvare <jdelvare@suse.de>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent ae944717

drivers/i2c/busses/i2c-i801.c

+20 −0
Original line number Diff line number Diff line
@@ -109,12 +109,16 @@ 


/* PCI Address Constants */

#define SMBBAR		4

#define SMBPCICTL	0x004

#define SMBPCISTS	0x006

#define SMBHSTCFG	0x040



/* Host status bits for SMBPCISTS */

#define SMBPCISTS_INTS		0x08



/* Control bits for SMBPCICTL */

#define SMBPCICTL_INTDIS	0x0400



/* Host configuration bits for SMBHSTCFG */

#define SMBHSTCFG_HST_EN	1

#define SMBHSTCFG_SMB_SMI_EN	2
@@ -1231,6 +1235,22 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id) 
	/* Default timeout in interrupt mode: 200 ms */

	priv->adapter.timeout = HZ / 5;



	if (priv->features & FEATURE_IRQ) {

		u16 pcictl, pcists;



		/* Complain if an interrupt is already pending */

		pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);

		if (pcists & SMBPCISTS_INTS)

			dev_warn(&dev->dev, "An interrupt is pending!\n");



		/* Check if interrupts have been disabled */

		pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);

		if (pcictl & SMBPCICTL_INTDIS) {

			dev_info(&dev->dev, "Interrupts are disabled\n");

			priv->features &= ~FEATURE_IRQ;

		}

	}



	if (priv->features & FEATURE_IRQ) {

		init_waitqueue_head(&priv->waitq);