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pata_via: Handle laptops via DMI

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Oh the joy of saving a fraction of a cent using short 40 wire cables and
not faking 80wire

Teach the VIA driver that there are some systems we need to know are
magically wired for high speeds.

Signed-off-by: Alan Cox <alan@redhat.com>
Tested-by: Francis Russell <FrancisRussell@btinternet.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2007-05-23 22:39:01 +01:00 committed by Jeff Garzik
parent 6dffaf61e2
commit cf5792d20c
1 changed files with 29 additions and 0 deletions
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29
drivers/ata/pata_via.c
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@ -60,6 +60,7 @@
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/dmi.h>
#define DRV_NAME "pata_via"
#define DRV_VERSION "0.3.1"
@ -122,6 +123,31 @@ static const struct via_isa_bridge {
{ NULL }
};
/*
* Cable special cases
*/
static struct dmi_system_id cable_dmi_table[] = {
{
.ident = "Acer Ferrari 3400",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
},
},
{ }
};
static int via_cable_override(struct pci_dev *pdev)
{
/* Systems by DMI */
if (dmi_check_system(cable_dmi_table))
return 1;
return 0;
}
/**
* via_cable_detect - cable detection
* @ap: ATA port
@ -139,6 +165,9 @@ static int via_cable_detect(struct ata_port *ap) {
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 ata66;
if (via_cable_override(pdev))
return ATA_CBL_PATA40_SHORT;
/* Early chips are 40 wire */
if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
return ATA_CBL_PATA40;