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Fri, 14 Apr 2023 09:40:26 -0500 From: Mario Limonciello To: Herbert Xu , Jarkko Nikula , Andy Shevchenko , Mika Westerberg , Jan Dabros CC: , Mario Limonciello , Mark Hasemeyer , "Wolfram Sang" , , Subject: [PATCH v9 2/2] i2c: designware: Add doorbell support for Mendocino Date: Fri, 14 Apr 2023 09:40:08 -0500 Message-ID: <20230414144008.836-3-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230414144008.836-1-mario.limonciello@amd.com> References: <20230414144008.836-1-mario.limonciello@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT017:EE_|IA0PR12MB8207:EE_ X-MS-Office365-Filtering-Correlation-Id: 00cbae68-dc5e-4e74-1ad8-08db3cf630c7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(346002)(396003)(376002)(136003)(39860400002)(451199021)(46966006)(36840700001)(40470700004)(26005)(36860700001)(5660300002)(36756003)(7416002)(44832011)(2906002)(316002)(40480700001)(8936002)(86362001)(4326008)(8676002)(81166007)(40460700003)(41300700001)(82310400005)(82740400003)(356005)(966005)(426003)(1076003)(70206006)(336012)(47076005)(70586007)(83380400001)(2616005)(54906003)(110136005)(186003)(7696005)(478600001)(16526019)(6666004)(36900700001);DIR:OUT;SFP:1101; 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Detect the platform by the device ID of the root port and choose the appropriate method. Link: https://lore.kernel.org/linux-i2c/20220916131854.687371-3-jsd@semihalf.com/ Signed-off-by: Mario Limonciello Acked-by: Jarkko Nikula Reviewed-by: Mark Hasemeyer Tested-by: Mark Hasemeyer Acked-by: Wolfram Sang --- v8->v9: * Add tag drivers/i2c/busses/Kconfig | 1 + drivers/i2c/busses/i2c-designware-amdpsp.c | 26 +++++++++++++++++++++- 2 files changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 89f8b75043d0..4b4323bbf268 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -568,6 +568,7 @@ config I2C_DESIGNWARE_AMDPSP bool "AMD PSP I2C semaphore support" depends on ACPI depends on CRYPTO_DEV_SP_PSP + depends on PCI depends on I2C_DESIGNWARE_PLATFORM depends on (I2C_DESIGNWARE_PLATFORM=y && CRYPTO_DEV_CCP_DD=y) || \ (I2C_DESIGNWARE_PLATFORM=m && CRYPTO_DEV_CCP_DD) diff --git a/drivers/i2c/busses/i2c-designware-amdpsp.c b/drivers/i2c/busses/i2c-designware-amdpsp.c index 12870dc44bdb..63454b06e5da 100644 --- a/drivers/i2c/busses/i2c-designware-amdpsp.c +++ b/drivers/i2c/busses/i2c-designware-amdpsp.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include #include @@ -32,6 +33,8 @@ static u32 psp_i2c_access_count; static bool psp_i2c_mbox_fail; static struct device *psp_i2c_dev; +static int (*_psp_send_i2c_req)(struct psp_i2c_req *req); + /* Helper to verify status returned by PSP */ static int check_i2c_req_sts(struct psp_i2c_req *req) { @@ -72,6 +75,17 @@ static int psp_send_i2c_req_cezanne(struct psp_i2c_req *req) return ret; } +static int psp_send_i2c_req_doorbell(struct psp_i2c_req *req) +{ + int ret; + + ret = psp_ring_platform_doorbell(req->type, &req->hdr.status); + if (ret == -EIO) + return check_i2c_req_sts(req); + + return ret; +} + static int psp_send_i2c_req(enum psp_i2c_req_type i2c_req_type) { struct psp_i2c_req *req; @@ -87,7 +101,7 @@ static int psp_send_i2c_req(enum psp_i2c_req_type i2c_req_type) req->type = i2c_req_type; start = jiffies; - ret = read_poll_timeout(psp_send_i2c_req_cezanne, status, + ret = read_poll_timeout(_psp_send_i2c_req, status, (status != -EBUSY), PSP_I2C_REQ_RETRY_DELAY_US, PSP_I2C_REQ_RETRY_CNT * PSP_I2C_REQ_RETRY_DELAY_US, @@ -262,6 +276,8 @@ static const struct i2c_lock_operations i2c_dw_psp_lock_ops = { int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev) { + struct pci_dev *rdev; + if (!IS_REACHABLE(CONFIG_CRYPTO_DEV_CCP_DD)) return -ENODEV; @@ -275,6 +291,14 @@ int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev) if (psp_i2c_dev) return -EEXIST; + /* Cezanne uses platform mailbox, Mendocino and later use doorbell */ + rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0)); + if (rdev->device == 0x1630) + _psp_send_i2c_req = psp_send_i2c_req_cezanne; + else + _psp_send_i2c_req = psp_send_i2c_req_doorbell; + pci_dev_put(rdev); + if (psp_check_platform_access_status()) return -EPROBE_DEFER;