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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2022 20:23:25.4001 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4d34794b-cda2-48a2-6324-08d9dac0619a X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT022.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1429 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The driver currently uses a CPU family match of 17h to determine EFCH_PM_DECODEEN_WDT_TMREN register support. This family check will not support future AMD CPUs and instead will require driver updates to add support. Remove the family 17h family check and add a check for SMBus PCI revision ID 0x51 or greater. The MMIO access method has been available since at least SMBus controllers using PCI revision 0x51. This revision check will support family 17h and future AMD processors including EFCH functionality without requiring driver changes. Co-developed-by: Robert Richter Signed-off-by: Robert Richter Signed-off-by: Terry Bowman To: Guenter Roeck To: linux-watchdog@vger.kernel.org To: Jean Delvare To: linux-i2c@vger.kernel.org To: Wolfram Sang To: Andy Shevchenko To: Rafael J. Wysocki Cc: linux-kernel@vger.kernel.org Cc: Wim Van Sebroeck Cc: Robert Richter Cc: Thomas Lendacky --- drivers/watchdog/sp5100_tco.c | 16 ++++------------ drivers/watchdog/sp5100_tco.h | 1 + 2 files changed, 5 insertions(+), 12 deletions(-) diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c index 36519a992ca1..b949dcd9f780 100644 --- a/drivers/watchdog/sp5100_tco.c +++ b/drivers/watchdog/sp5100_tco.c @@ -86,6 +86,10 @@ static enum tco_reg_layout tco_reg_layout(struct pci_dev *dev) dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS && dev->revision < 0x40) { return sp5100; + } else if (dev->vendor == PCI_VENDOR_ID_AMD && + sp5100_tco_pci->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS && + sp5100_tco_pci->revision >= AMD_ZEN_SMBUS_PCI_REV) { + return efch_mmio; } else if (dev->vendor == PCI_VENDOR_ID_AMD && ((dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS && dev->revision >= 0x41) || @@ -461,18 +465,6 @@ static int sp5100_tco_setupdevice(struct device *dev, break; case efch: dev_name = SB800_DEVNAME; - /* - * On Family 17h devices, the EFCH_PM_DECODEEN_WDT_TMREN bit of - * EFCH_PM_DECODEEN not only enables the EFCH_PM_WDT_ADDR memory - * region, it also enables the watchdog itself. - */ - if (boot_cpu_data.x86 == 0x17) { - val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN); - if (!(val & EFCH_PM_DECODEEN_WDT_TMREN)) { - sp5100_tco_update_pm_reg8(EFCH_PM_DECODEEN, 0xff, - EFCH_PM_DECODEEN_WDT_TMREN); - } - } val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN); if (val & EFCH_PM_DECODEEN_WDT_TMREN) mmio_addr = EFCH_PM_WDT_ADDR; diff --git a/drivers/watchdog/sp5100_tco.h b/drivers/watchdog/sp5100_tco.h index 2df8f8b2c55b..4fac39a2f12f 100644 --- a/drivers/watchdog/sp5100_tco.h +++ b/drivers/watchdog/sp5100_tco.h @@ -88,3 +88,4 @@ #define EFCH_PM_ACPI_MMIO_PM_ADDR (EFCH_PM_ACPI_MMIO_ADDR + \ EFCH_PM_ACPI_MMIO_PM_OFFSET) #define EFCH_PM_ACPI_MMIO_PM_SIZE 8 +#define AMD_ZEN_SMBUS_PCI_REV 0x51 -- 2.30.2