Re: libata PATA patch update

[Matthieu CASTET <castet.matthieu@free.fr>]

Hi Alan,

Le Mon, 08 May 2006 17:06:40 +0100, Alan Cox a écrit :

> I've posted a new patch versus 2.6.17-rc3 up at the usual location.
> 
> http://zeniv.linux.org.uk/~alan/IDE
> 
Aren't there a bug in via cable detect ?

The via ide driver do
pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
for (i = 24; i >= 0; i -= 8)
                                if (((u >> i) & 0x10) ||
                                    (((u >> i) & 0x20) &&
                                     (((u >> i) & 7) < 6))) {
                                        /* BIOS 80-wire bit or
                                         * UDMA w/ < 60ns/cycle
                                         */
                                        vdev->via_80w |= (1 << (1 - (i >> 4)));
                                }
80w = (vdev->via_80w >> hwif->channel) & 1;

upper bit are for channel 0 and lower bit for channel 1.
the pata driver do
pci_read_config_dword(pdev, 0x50, &ata66);
80w = ata66 & (0x1010 << (16 * ap->hard_port_no))
upper bit are for channel 1 and lower bit for channel 0.

at boot VIA_UDMA_TIMING is 0xf1f1e6e6 for a 80w cable on channel 0 and 40w
cable on channel 1.
Pata driver set my UDMA100 disk at UDMA33.

Matthieu.

PS : any idea in order to allow to work my cdrw drive, that don't return
interrupt when setting xfermode ?