diff options
Diffstat (limited to 'drivers/platform/x86/amd/hsmp.c')
| -rw-r--r-- | drivers/platform/x86/amd/hsmp.c | 50 |
1 files changed, 43 insertions, 7 deletions
diff --git a/drivers/platform/x86/amd/hsmp.c b/drivers/platform/x86/amd/hsmp.c index d84ea66eecc6..8fcf38eed7f0 100644 --- a/drivers/platform/x86/amd/hsmp.c +++ b/drivers/platform/x86/amd/hsmp.c @@ -907,16 +907,44 @@ static int hsmp_plat_dev_register(void) return ret; } +/* + * This check is only needed for backward compatibility of previous platforms. + * All new platforms are expected to support ACPI based probing. + */ +static bool legacy_hsmp_support(void) +{ + if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) + return false; + + switch (boot_cpu_data.x86) { + case 0x19: + switch (boot_cpu_data.x86_model) { + case 0x00 ... 0x1F: + case 0x30 ... 0x3F: + case 0x90 ... 0x9F: + case 0xA0 ... 0xAF: + return true; + default: + return false; + } + case 0x1A: + switch (boot_cpu_data.x86_model) { + case 0x00 ... 0x1F: + return true; + default: + return false; + } + default: + return false; + } + + return false; +} + static int __init hsmp_plt_init(void) { int ret = -ENODEV; - if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD || boot_cpu_data.x86 < 0x19) { - pr_err("HSMP is not supported on Family:%x model:%x\n", - boot_cpu_data.x86, boot_cpu_data.x86_model); - return ret; - } - /* * amd_nb_num() returns number of SMN/DF interfaces present in the system * if we have N SMN/DF interfaces that ideally means N sockets @@ -930,7 +958,15 @@ static int __init hsmp_plt_init(void) return ret; if (!plat_dev.is_acpi_device) { - ret = hsmp_plat_dev_register(); + if (legacy_hsmp_support()) { + /* Not ACPI device, but supports HSMP, register a plat_dev */ + ret = hsmp_plat_dev_register(); + } else { + /* Not ACPI, Does not support HSMP */ + pr_info("HSMP is not supported on Family:%x model:%x\n", + boot_cpu_data.x86, boot_cpu_data.x86_model); + ret = -ENODEV; + } if (ret) platform_driver_unregister(&amd_hsmp_driver); } |