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pata_sis: add mode_filter method for certain sis5513 chipsets 

This mirrors a very old commit (3160d5416f, "sis5513: add
->udma_filter method for chipset_family >= ATA_133") to the old sis5513
IDE driver that prevents certain setups from working.

UDMA6 (ATA/133) is not supported on some chipsets and we need to ensure
this mode is not chosen even if a connected drive supports it. Port this
old patch forward to the new PATA driver to ensure UDMA5 is the highest
mode used if that is what is supported.

Kernel bugzilla #41582.

Reviewed-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Dan McGee 2011-09-07 11:23:19 -05:00 committed by Jeff Garzik
parent 023a0175ad
commit f30f9a5e7b
1 changed files with 26 additions and 1 deletions
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27
drivers/ata/pata_sis.c
View File

@ -509,6 +509,27 @@ static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
pci_write_config_dword(pdev, port, t1);
}
/**
* sis_133_mode_filter - mode selection filter
* @adev: ATA device
*
* Block UDMA6 on devices that do not support it.
*/
static unsigned long sis_133_mode_filter(struct ata_device *adev, unsigned long mask)
{
struct ata_port *ap = adev->link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int port = sis_port_base(adev);
u32 t1;
pci_read_config_dword(pdev, port, &t1);
/* if ATA133 is disabled, mask it out */
if (!(t1 & 0x08))
mask &= ~(0xC0 << ATA_SHIFT_UDMA);
return mask;
}
static struct scsi_host_template sis_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
@ -530,6 +551,7 @@ static struct ata_port_operations sis_133_ops = {
.set_piomode = sis_133_set_piomode,
.set_dmamode = sis_133_set_dmamode,
.cable_detect = sis_133_cable_detect,
.mode_filter = sis_133_mode_filter,
};
static struct ata_port_operations sis_133_early_ops = {
@ -779,10 +801,13 @@ static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
switch(trueid) {
case 0x5518: /* SIS 962/963 */
dev_info(&pdev->dev,
"SiS 962/963 MuTIOL IDE UDMA133 controller\n");
chipset = &sis133;
if ((idemisc & 0x40000000) == 0) {
pci_write_config_dword(pdev, 0x54, idemisc | 0x40000000);
printk(KERN_INFO "SIS5513: Switching to 5513 register mapping\n");
dev_info(&pdev->dev,
"Switching to 5513 register mapping\n");
}
break;
case 0x0180: /* SIS 965/965L */