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platform/x86: p2sb: Don't fail if unknown CPU is found

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We have accessing P2SB from a very few places for quite known hardware.

When a new SoC appears in intel-family.h it's not obvious that it needs
to be added to p2sb.c as well. Instead, provide default BDF and refactor
p2sb_get_devfn() to always succeed. If in the future we would need to
exclude something, we may add a list of unsupported IDs.

Without this change the iTCO on Intel Comet Lake SoCs became unavailable:

  i801_smbus 0000:00:1f.4: failed to create iTCO device

Fixes: 5c7b9167dd ("i2c: i801: convert to use common P2SB accessor")
Reported-and-tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20221104154916.35231-1-andriy.shevchenko@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Andy Shevchenko 2022-11-04 17:49:16 +02:00 committed by Hans de Goede
parent a977ece577
commit 53eb64c88f
1 changed files with 6 additions and 9 deletions
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15
drivers/platform/x86/p2sb.c
View File

@ -19,26 +19,23 @@
#define P2SBC 0xe0
#define P2SBC_HIDE BIT(8)
#define P2SB_DEVFN_DEFAULT PCI_DEVFN(31, 1)
static const struct x86_cpu_id p2sb_cpu_ids[] = {
X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, PCI_DEVFN(13, 0)),
X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, PCI_DEVFN(31, 1)),
X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, PCI_DEVFN(31, 1)),
X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, PCI_DEVFN(31, 1)),
X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, PCI_DEVFN(31, 1)),
X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, PCI_DEVFN(31, 1)),
X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, PCI_DEVFN(31, 1)),
{}
};
static int p2sb_get_devfn(unsigned int *devfn)
{
unsigned int fn = P2SB_DEVFN_DEFAULT;
const struct x86_cpu_id *id;
id = x86_match_cpu(p2sb_cpu_ids);
if (!id)
return -ENODEV;
if (id)
fn = (unsigned int)id->driver_data;
*devfn = (unsigned int)id->driver_data;
*devfn = fn;
return 0;
}