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Subject[PATCH] pata_sil680: Assorted fixes
Correct iordy handling and DMA bit flag handling.

Signed-off-by: Alan Cox <alan@redhat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.20-mm2/drivers/ata/pata_sil680.c linux-2.6.20-mm2/drivers/ata/pata_sil680.c
--- linux.vanilla-2.6.20-mm2/drivers/ata/pata_sil680.c 2007-02-20 13:37:58.000000000 +0000
+++ linux-2.6.20-mm2/drivers/ata/pata_sil680.c 2007-02-20 13:56:39.000000000 +0000
@@ -33,7 +33,7 @@
#include <linux/libata.h>

#define DRV_NAME "pata_sil680"
-#define DRV_VERSION "0.4.1"
+#define DRV_VERSION "0.4.5"

/**
* sil680_selreg - return register base
@@ -139,10 +139,13 @@

unsigned long tfaddr = sil680_selreg(ap, 0x02);
unsigned long addr = sil680_seldev(ap, adev, 0x04);
+ unsigned long addr_mask = 0x80 + 4 * ap->port_no;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int pio = adev->pio_mode - XFER_PIO_0;
int lowest_pio = pio;
+ int port_shift = 4 * adev->devno;
u16 reg;
+ u8 mode;

struct ata_device *pair = ata_dev_pair(adev);

@@ -153,10 +156,17 @@
pci_write_config_word(pdev, tfaddr, speed_t[lowest_pio]);

pci_read_config_word(pdev, tfaddr-2, &reg);
+ pci_read_config_byte(pdev, addr_mask, &mode);
+
reg &= ~0x0200; /* Clear IORDY */
- if (ata_pio_need_iordy(adev))
+ mode &= ~(3 << port_shift); /* Clear IORDY and DMA bits */
+
+ if (ata_pio_need_iordy(adev)) {
reg |= 0x0200; /* Enable IORDY */
+ mode |= 1 << port_shift;
+ }
pci_write_config_word(pdev, tfaddr-2, reg);
+ pci_write_config_byte(pdev, addr_mask, mode);
}

/**
-
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