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libata-sff: Don't scan disabled ports when checking for legacy mode.

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libata-sff.c checks for legacy mode by testing if both primary and
secondary ports on a controller are in legacy mode and selects legacy
if either one is. However on some south bridge chips (e.g AMD
SB600/SB700) the secondary port is not wired, and when it is disabled
by setting the disable bit in the PCI header it appears as a fixed
legacy port.

Prevent incorrect detection by not testing ports that are marked as
'dummy'

tj: Addressed Sergei's review points.  Other style edits.

Signed-off-by: Darren Stevens <darren@stevens-zone.net>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
This commit is contained in:
Darren Stevens 2017-01-23 14:33:36 -05:00 committed by Tejun Heo
parent d786b91f42
commit 589d572671
1 changed files with 13 additions and 3 deletions
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16
drivers/ata/libata-sff.c
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@ -2428,11 +2428,21 @@ int ata_pci_sff_activate_host(struct ata_host *host,
return rc;
if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
u8 tmp8, mask;
u8 tmp8, mask = 0;
/* TODO: What if one channel is in native mode ... */
/*
* ATA spec says we should use legacy mode when one
* port is in legacy mode, but disabled ports on some
* PCI hosts appear as fixed legacy ports, e.g SB600/700
* on which the secondary port is not wired, so
* ignore ports that are marked as 'dummy' during
* this check
*/
pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
mask = (1 << 2) | (1 << 0);
if (!ata_port_is_dummy(host->ports[0]))
mask |= (1 << 0);
if (!ata_port_is_dummy(host->ports[1]))
mask |= (1 << 2);
if ((tmp8 & mask) != mask)
legacy_mode = 1;
}