From 849be516c57501ec4729bde51babc25a7b073b65 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Tue, 13 Feb 2007 22:08:57 +0100 Subject: [PATCH] i2c-ali1563: Fix device initialization The i2c-ali1563 initialization looks quite broken to me: * If the I/O space isn't enabled, we forcibly set 3 bits in the PCI configuration space instead of just the one enabling the I/O space. * After that we pretend to check if the write worked, but we don't actually read the new value from the register. * It's probably not a good idea to enable the I/O space if no base address has been set. So I propose the following changes to that part of the driver: * Merge ali1563_enable() into ali1563_setup(). * Check the base address before the I/O space enabled bit. Signed-off-by: Jean Delvare Acked-by: Rudolf Marek --- drivers/i2c/busses/i2c-ali1563.c | 41 ++++++++++++++------------------ 1 file changed, 18 insertions(+), 23 deletions(-) diff --git a/drivers/i2c/busses/i2c-ali1563.c b/drivers/i2c/busses/i2c-ali1563.c index 3b0e79b1e871..55ebbef41e97 100644 --- a/drivers/i2c/busses/i2c-ali1563.c +++ b/drivers/i2c/busses/i2c-ali1563.c @@ -314,35 +314,12 @@ static u32 ali1563_func(struct i2c_adapter * a) } -static void ali1563_enable(struct pci_dev * dev) -{ - u16 ctrl; - - pci_read_config_word(dev,ALI1563_SMBBA,&ctrl); - ctrl |= 0x7; - pci_write_config_word(dev,ALI1563_SMBBA,ctrl); -} - static int __devinit ali1563_setup(struct pci_dev * dev) { u16 ctrl; pci_read_config_word(dev,ALI1563_SMBBA,&ctrl); - /* Check if device is even enabled first */ - if (!(ctrl & ALI1563_SMB_IOEN)) { - dev_warn(&dev->dev,"I/O space not enabled, trying manually\n"); - ali1563_enable(dev); - } - if (!(ctrl & ALI1563_SMB_IOEN)) { - dev_warn(&dev->dev,"I/O space still not enabled, giving up\n"); - goto Err; - } - if (!(ctrl & ALI1563_SMB_HOSTEN)) { - dev_warn(&dev->dev,"Host Controller not enabled\n"); - goto Err; - } - /* SMB I/O Base in high 12 bits and must be aligned with the * size of the I/O space. */ ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1); @@ -350,6 +327,24 @@ static int __devinit ali1563_setup(struct pci_dev * dev) dev_warn(&dev->dev,"ali1563_smba Uninitialized\n"); goto Err; } + + /* Check if device is enabled */ + if (!(ctrl & ALI1563_SMB_HOSTEN)) { + dev_warn(&dev->dev, "Host Controller not enabled\n"); + goto Err; + } + if (!(ctrl & ALI1563_SMB_IOEN)) { + dev_warn(&dev->dev, "I/O space not enabled, trying manually\n"); + pci_write_config_word(dev, ALI1563_SMBBA, + ctrl | ALI1563_SMB_IOEN); + pci_read_config_word(dev, ALI1563_SMBBA, &ctrl); + if (!(ctrl & ALI1563_SMB_IOEN)) { + dev_err(&dev->dev, "I/O space still not enabled, " + "giving up\n"); + goto Err; + } + } + if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE, ali1563_pci_driver.name)) { dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n", -- 2.30.2