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SubjectRe: PATA driver patch for 2.6.17
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Ar Maw, 2006-06-20 am 21:12 +0400, ysgrifennodd Andrey Borzenkov:
> Running vanilla 2.6.17 + ide1 patch on ALi M5229 does not find CD-ROM.
> Notice "ata2: command 0xa0 timeout" below.

Not sure immediately but does the following help

--- ../libata-devo/drivers/scsi/pata_ali.c 2006-06-20 11:50:15.000000000 +0100
+++ drivers/scsi/pata_ali.c 2006-06-21 21:42:27.458542280 +0100
@@ -181,11 +181,12 @@
u8 fifo;
int shift = 4 * adev->devno;

- /* Bits 3:2 (7:6 for slave) control the PIO. 00 is off 01
- is on. The FIFO must not be used for ATAPI. We preserve
- BIOS set thresholds */
+ /* ATA - FIFO on set nibble to 0x05, ATAPI - FIFO off, set nibble to
+ 0x00. Not all the docs agree but the behaviour we now use is the
+ one stated in the BIOS Programming Guide */
+
pci_read_config_byte(pdev, pio_fifo, &fifo);
- fifo &= ~(0x0C << shift);
+ fifo &= ~(0x0F << shift);
if (on)
fifo |= (on << shift);
pci_write_config_byte(pdev, pio_fifo, fifo);
@@ -261,10 +262,10 @@

/* PIO FIFO is only permitted on ATA disk */
if (adev->class != ATA_DEV_ATA)
- ali_fifo_control(ap, adev, 0);
+ ali_fifo_control(ap, adev, 0x00);
ali_program_modes(ap, adev, &t, 0);
if (adev->class == ATA_DEV_ATA)
- ali_fifo_control(ap, adev, 0x04);
+ ali_fifo_control(ap, adev, 0x05);

}

-
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