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(unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgC3GqPeEL5pv06sAQ--.26642S4; Sat, 21 Mar 2026 11:30:44 +0800 (CST) From: Hans Zhang <18255117159@163.com> To: bhelgaas@google.com, lpieralisi@kernel.org, kwilczynski@kernel.org, mani@kernel.org, hans.zhang@cixtech.com Cc: robh@kernel.org, mpillai@cadence.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Zhang <18255117159@163.com> Subject: [PATCH v2 2/2] PCI: cadence: Add debugfs property to provide LTSSM status of the PCIe link Date: Sat, 21 Mar 2026 11:30:35 +0800 Message-Id: <20260321033035.3008585-3-18255117159@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260321033035.3008585-1-18255117159@163.com> References: <20260321033035.3008585-1-18255117159@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PigvCgC3GqPeEL5pv06sAQ--.26642S4 X-Coremail-Antispam: 1Uf129KBjvAXoWfXr43Kr4xCrW7ZF47Zr4xJFb_yoW8KrWfto W3Gw4fW3WxZa4DAas3W3ZrGFyxXr1293W7ta18KF1rGFsFk3ZrtrWUXr18ta1Fgr1UArW5 Ar1DZ3W2kr4xWwsrn29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7v73VFW2AGmfu7bjvjm3 AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvj4ippBUUUUUU X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/xtbCwwRH6mm+EORaUwAA3A Content-Type: text/plain; charset="utf-8" Add the debugfs property to provide a view of the current link's LTSSM status from the Root Port device. Test example: # cat /sys/kernel/debug/cdns_pcie_a0c0000.pcie/ltssm_status L0_STATE (0x29) Signed-off-by: Hans Zhang <18255117159@163.com> --- Documentation/ABI/testing/debugfs-cdns-pcie | 5 + drivers/pci/controller/cadence/Kconfig | 9 + drivers/pci/controller/cadence/Makefile | 1 + .../controller/cadence/pcie-cadence-debugfs.c | 214 ++++++++++++++++++ .../pci/controller/cadence/pcie-cadence-ep.c | 2 + .../cadence/pcie-cadence-host-hpa.c | 8 +- .../controller/cadence/pcie-cadence-host.c | 8 +- drivers/pci/controller/cadence/pcie-cadence.h | 145 ++++++++++++ 8 files changed, 390 insertions(+), 2 deletions(-) create mode 100644 Documentation/ABI/testing/debugfs-cdns-pcie create mode 100644 drivers/pci/controller/cadence/pcie-cadence-debugfs.c diff --git a/Documentation/ABI/testing/debugfs-cdns-pcie b/Documentation/AB= I/testing/debugfs-cdns-pcie new file mode 100644 index 000000000000..659ad2ab70e4 --- /dev/null +++ b/Documentation/ABI/testing/debugfs-cdns-pcie @@ -0,0 +1,5 @@ +What: /sys/kernel/debug/cdns_pcie_/ltssm_status +Date: March 2026 +Contact: Hans Zhang <18255117159@163.com> +Description: (RO) Read will return the current PCIe LTSSM state in both + string and raw value. diff --git a/drivers/pci/controller/cadence/Kconfig b/drivers/pci/controlle= r/cadence/Kconfig index 9e651d545973..b277c5f6e196 100644 --- a/drivers/pci/controller/cadence/Kconfig +++ b/drivers/pci/controller/cadence/Kconfig @@ -6,6 +6,15 @@ menu "Cadence-based PCIe controllers" config PCIE_CADENCE tristate =20 +config PCIE_CADENCE_DEBUGFS + bool "Cadence PCIe debugfs entries" + depends on DEBUG_FS + depends on PCIE_CADENCE_HOST || PCIE_CADENCE_EP + help + Say Y here to enable debugfs entries for the PCIe controller. These + entries provide various debug features related to the controller and + the LTSSM status of link can be displayed. + config PCIE_CADENCE_HOST tristate depends on OF diff --git a/drivers/pci/controller/cadence/Makefile b/drivers/pci/controll= er/cadence/Makefile index b8ec1cecfaa8..2cdc4617e0c2 100644 --- a/drivers/pci/controller/cadence/Makefile +++ b/drivers/pci/controller/cadence/Makefile @@ -4,6 +4,7 @@ pcie-cadence-host-mod-y :=3D pcie-cadence-host-common.o pci= e-cadence-host.o pcie-c pcie-cadence-ep-mod-y :=3D pcie-cadence-ep.o =20 obj-$(CONFIG_PCIE_CADENCE) =3D pcie-cadence-mod.o +obj-$(CONFIG_PCIE_CADENCE_DEBUGFS) +=3D pcie-cadence-debugfs.o obj-$(CONFIG_PCIE_CADENCE_HOST) +=3D pcie-cadence-host-mod.o obj-$(CONFIG_PCIE_CADENCE_EP) +=3D pcie-cadence-ep-mod.o obj-$(CONFIG_PCIE_CADENCE_PLAT) +=3D pcie-cadence-plat.o diff --git a/drivers/pci/controller/cadence/pcie-cadence-debugfs.c b/driver= s/pci/controller/cadence/pcie-cadence-debugfs.c new file mode 100644 index 000000000000..16addd919eae --- /dev/null +++ b/drivers/pci/controller/cadence/pcie-cadence-debugfs.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Cadence PCIe controller debugfs driver + * + * Copyright (C) 2026 Hans Zhang <18255117159@163.com> + * Author: Hans Zhang <18255117159@163.com> + */ + +#include + +#include "pcie-cadence.h" + +#define CDNS_DEBUGFS_BUF_MAX 128 +#define CDNS_PCIE_LGA_LTSSM_STATUS_MASK GENMASK(29, 24) +#define CDNS_PCIE_HPA_LTSSM_STATUS_MASK GENMASK(27, 20) + +static const char *cdns_pcie_ltssm_status_string(enum cdns_pcie_ltssm ltss= m) +{ + const char *str; + + switch (ltssm) { +#define CDNS_PCIE_LTSSM_NAME(n) case n: str =3D #n; break + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DETECT_QUIET); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DETECT_QUIET_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DETECT_ACTIVE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DETECT_ACTIVE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DETECT_ACTIVE_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DETECT_ACTIVE_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RCVR_DETECTED_ST); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RCVR_DETECTED_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_ACTIVE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_ACTIVE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_ACTIVE_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_ACTIVE_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_CONFIG); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_CONFIG_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_CONFIG_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_START_RC); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_START_RC_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_START_RC_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_ACC_RC); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_RC); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_RC_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_ACC_RC); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_START_EP); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_START_EP_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_START_EP_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LW_ACC_EP); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_EP); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_EP_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_ACC_EP); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_LANENUM_ACC_EP_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DUMMY_STATE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_COMPLETE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_COMPLETE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_COMPLETE_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_IDLE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_CONFIG_IDLE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DUMMY_STATE_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DUMMY_STATE_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DUMMY_STATE_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0_STATE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_RCVR_LOCK); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_RCVR_LOCK_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_RCVR_CFG); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_RCVR_CFG_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_IDLE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_IDLE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_5); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_6); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_DISABLE_LINK_7); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_HOT_RESET); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_HOT_RESET_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_HOT_RESET_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_HOT_RESET_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0S_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0S_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0S_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0S_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0S_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L0S_5); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_WAIT_FOR_LINK_TX); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_FTS_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_FTS_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_FTS_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_ELEC_IDLE_ST); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_ELEC_IDLE_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_ELEC_IDLE_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_TX_ELEC_IDLE_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_SPEED); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_SPEED_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_SPEED_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_SPEED_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_5); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_6); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_7); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_8); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_ENTRY_FROM_RECOVERY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_EXIT_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_EXIT); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_5); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_ACTIVE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_IDLE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L1_EXIT); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_5); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_L2_IDLE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_3); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_4); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_5); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_FROM_RECOVERY); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ACTIVE); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_EXIT); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_EXIT_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_LOOPBACK_MASTER_EXIT_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE0); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE2_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE2_2); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE3_1); + CDNS_PCIE_LTSSM_NAME(CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE3_2); + default: + str =3D "CDNS_PCIE_LTSSM_UNKNOWN"; + break; + } + + return str + strlen("CDNS_PCIE_LTSSM_"); +} + +static int ltssm_status_show(struct seq_file *s, void *v) +{ + struct cdns_pcie *pci =3D s->private; + enum cdns_pcie_ltssm ltssm; + u32 reg; + + if (pci->is_hpa) { + reg =3D cdns_pcie_hpa_readl(pci, REG_BANK_IP_REG, + CDNS_PCIE_HPA_PHY_DBG_STS_REG0); + ltssm =3D FIELD_GET(CDNS_PCIE_HPA_LTSSM_STATUS_MASK, reg); + } else { + reg =3D cdns_pcie_readl(pci, CDNS_PCIE_LM_BASE); + ltssm =3D FIELD_GET(CDNS_PCIE_LGA_LTSSM_STATUS_MASK, reg); + } + + seq_printf(s, "%s (0x%02x)\n", cdns_pcie_ltssm_status_string(ltssm), ltss= m); + + return 0; +} + +static int ltssm_status_open(struct inode *inode, struct file *file) +{ + return single_open(file, ltssm_status_show, inode->i_private); +} + +static const struct file_operations cdns_pcie_ltssm_status_ops =3D { + .open =3D ltssm_status_open, + .read =3D seq_read, +}; + +static void cdns_pcie_ltssm_debugfs_init(struct cdns_pcie *pci, struct den= try *dir) +{ + debugfs_create_file("ltssm_status", 0444, dir, pci, + &cdns_pcie_ltssm_status_ops); +} + +void cdns_pcie_debugfs_deinit(struct cdns_pcie *pci) +{ + if (!pci->debug_dir) + return; + + debugfs_remove_recursive(pci->debug_dir); +} + +void cdns_pcie_debugfs_init(struct cdns_pcie *pci) +{ + char dirname[CDNS_DEBUGFS_BUF_MAX]; + struct device *dev =3D pci->dev; + + /* Create main directory for each platform driver. */ + snprintf(dirname, CDNS_DEBUGFS_BUF_MAX, "cdns_pcie_%s", dev_name(dev)); + pci->debug_dir =3D debugfs_create_dir(dirname, NULL); + + cdns_pcie_ltssm_debugfs_init(pci, pci->debug_dir); +} +EXPORT_SYMBOL_GPL(cdns_pcie_debugfs_init); diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci= /controller/cadence/pcie-cadence-ep.c index c0e1194a936b..7849f63f53ab 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c @@ -761,6 +761,8 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep) =20 pci_epc_init_notify(epc); =20 + cdns_pcie_debugfs_init(pcie); + return 0; =20 free_epc_mem: diff --git a/drivers/pci/controller/cadence/pcie-cadence-host-hpa.c b/drive= rs/pci/controller/cadence/pcie-cadence-host-hpa.c index 0f540bed58e8..38bd74d9e071 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-host-hpa.c +++ b/drivers/pci/controller/cadence/pcie-cadence-host-hpa.c @@ -360,7 +360,13 @@ int cdns_pcie_hpa_host_setup(struct cdns_pcie_rc *rc) if (!bridge->ops) bridge->ops =3D &cdns_pcie_hpa_host_ops; =20 - return pci_host_probe(bridge); + ret =3D pci_host_probe(bridge); + if (ret) + return ret; + + cdns_pcie_debugfs_init(pcie); + + return 0; } EXPORT_SYMBOL_GPL(cdns_pcie_hpa_host_setup); =20 diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/p= ci/controller/cadence/pcie-cadence-host.c index db3154c1eccb..23ca1e703953 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-host.c +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c @@ -416,7 +416,13 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc) if (!bridge->ops) bridge->ops =3D &cdns_pcie_host_ops; =20 - return pci_host_probe(bridge); + ret =3D pci_host_probe(bridge); + if (ret) + return ret; + + cdns_pcie_debugfs_init(pcie); + + return 0; } EXPORT_SYMBOL_GPL(cdns_pcie_host_setup); =20 diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/co= ntroller/cadence/pcie-cadence.h index c8cb19f7622f..6db98b7d24cb 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -42,6 +42,137 @@ enum cdns_pcie_reg_bank { REG_BANKS_MAX, }; =20 +enum cdns_pcie_ltssm { + CDNS_PCIE_LTSSM_DETECT_QUIET =3D 0, + CDNS_PCIE_LTSSM_DETECT_QUIET_ENTRY =3D 1, + CDNS_PCIE_LTSSM_DETECT_ACTIVE =3D 2, + CDNS_PCIE_LTSSM_DETECT_ACTIVE_1 =3D 3, + CDNS_PCIE_LTSSM_DETECT_ACTIVE_2 =3D 4, + CDNS_PCIE_LTSSM_DETECT_ACTIVE_3 =3D 5, + CDNS_PCIE_LTSSM_RCVR_DETECTED_ST =3D 6, + CDNS_PCIE_LTSSM_RCVR_DETECTED_1 =3D 7, + CDNS_PCIE_LTSSM_POLLING_ACTIVE =3D 8, + CDNS_PCIE_LTSSM_POLLING_ACTIVE_1 =3D 9, + CDNS_PCIE_LTSSM_POLLING_ACTIVE_2 =3D 10, + CDNS_PCIE_LTSSM_POLLING_ACTIVE_3 =3D 11, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE =3D 12, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_1 =3D 13, + CDNS_PCIE_LTSSM_POLLING_CONFIG =3D 14, + CDNS_PCIE_LTSSM_POLLING_CONFIG_1 =3D 15, + CDNS_PCIE_LTSSM_POLLING_CONFIG_2 =3D 16, + CDNS_PCIE_LTSSM_CONFIG_LW_START_RC =3D 17, + CDNS_PCIE_LTSSM_CONFIG_LW_START_RC_1 =3D 18, + CDNS_PCIE_LTSSM_CONFIG_LW_START_RC_2 =3D 19, + CDNS_PCIE_LTSSM_CONFIG_LW_ACC_RC =3D 20, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_RC =3D 21, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_RC_1 =3D 22, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_ACC_RC =3D 23, + CDNS_PCIE_LTSSM_CONFIG_LW_START_EP =3D 24, + CDNS_PCIE_LTSSM_CONFIG_LW_START_EP_1 =3D 25, + CDNS_PCIE_LTSSM_CONFIG_LW_START_EP_2 =3D 26, + CDNS_PCIE_LTSSM_CONFIG_LW_ACC_EP =3D 27, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_EP =3D 28, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_WAIT_EP_1 =3D 29, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_ACC_EP =3D 30, + CDNS_PCIE_LTSSM_CONFIG_LANENUM_ACC_EP_1 =3D 31, + CDNS_PCIE_LTSSM_DUMMY_STATE_1 =3D 32, + CDNS_PCIE_LTSSM_CONFIG_COMPLETE =3D 33, + CDNS_PCIE_LTSSM_CONFIG_COMPLETE_1 =3D 34, + CDNS_PCIE_LTSSM_CONFIG_COMPLETE_2 =3D 35, + CDNS_PCIE_LTSSM_CONFIG_IDLE =3D 36, + CDNS_PCIE_LTSSM_CONFIG_IDLE_1 =3D 37, + CDNS_PCIE_LTSSM_DUMMY_STATE_2 =3D 38, + CDNS_PCIE_LTSSM_DUMMY_STATE_3 =3D 39, + CDNS_PCIE_LTSSM_DUMMY_STATE_4 =3D 40, + CDNS_PCIE_LTSSM_L0_STATE =3D 41, + CDNS_PCIE_LTSSM_RECOVERY_RCVR_LOCK =3D 42, + CDNS_PCIE_LTSSM_RECOVERY_RCVR_LOCK_1 =3D 43, + CDNS_PCIE_LTSSM_RECOVERY_RCVR_CFG =3D 44, + CDNS_PCIE_LTSSM_RECOVERY_RCVR_CFG_1 =3D 45, + CDNS_PCIE_LTSSM_RECOVERY_IDLE =3D 46, + CDNS_PCIE_LTSSM_RECOVERY_IDLE_1 =3D 47, + CDNS_PCIE_LTSSM_DISABLE_LINK =3D 48, + CDNS_PCIE_LTSSM_DISABLE_LINK_1 =3D 49, + CDNS_PCIE_LTSSM_DISABLE_LINK_2 =3D 50, + CDNS_PCIE_LTSSM_DISABLE_LINK_3 =3D 51, + CDNS_PCIE_LTSSM_DISABLE_LINK_4 =3D 52, + CDNS_PCIE_LTSSM_DISABLE_LINK_5 =3D 53, + CDNS_PCIE_LTSSM_DISABLE_LINK_6 =3D 54, + CDNS_PCIE_LTSSM_DISABLE_LINK_7 =3D 55, + CDNS_PCIE_LTSSM_HOT_RESET =3D 56, + CDNS_PCIE_LTSSM_HOT_RESET_1 =3D 57, + CDNS_PCIE_LTSSM_HOT_RESET_2 =3D 58, + CDNS_PCIE_LTSSM_HOT_RESET_3 =3D 59, + CDNS_PCIE_LTSSM_L0S_ENTRY =3D 60, + CDNS_PCIE_LTSSM_L0S_1 =3D 61, + CDNS_PCIE_LTSSM_L0S_2 =3D 62, + CDNS_PCIE_LTSSM_L0S_3 =3D 63, + CDNS_PCIE_LTSSM_L0S_4 =3D 64, + CDNS_PCIE_LTSSM_L0S_5 =3D 65, + CDNS_PCIE_LTSSM_WAIT_FOR_LINK_TX =3D 66, + CDNS_PCIE_LTSSM_TX_FTS_ENTRY =3D 67, + CDNS_PCIE_LTSSM_TX_FTS_1 =3D 68, + CDNS_PCIE_LTSSM_TX_FTS_2 =3D 69, + CDNS_PCIE_LTSSM_TX_ELEC_IDLE_ST =3D 70, + CDNS_PCIE_LTSSM_TX_ELEC_IDLE_1 =3D 71, + CDNS_PCIE_LTSSM_TX_ELEC_IDLE_2 =3D 72, + CDNS_PCIE_LTSSM_TX_ELEC_IDLE_3 =3D 73, + CDNS_PCIE_LTSSM_RECOVERY_SPEED =3D 74, + CDNS_PCIE_LTSSM_RECOVERY_SPEED_1 =3D 75, + CDNS_PCIE_LTSSM_RECOVERY_SPEED_2 =3D 76, + CDNS_PCIE_LTSSM_RECOVERY_SPEED_3 =3D 77, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23 =3D 78, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_1 =3D 79, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_2 =3D 80, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_3 =3D 81, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_4 =3D 82, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_5 =3D 83, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_6 =3D 84, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_7 =3D 85, + CDNS_PCIE_LTSSM_POLLING_COMPLIANCE_GEN23_8 =3D 86, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_ENTRY =3D 87, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_ENTRY_FROM_RECOVERY =3D 88, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_EXIT_1 =3D 89, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_EXIT =3D 90, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_1 =3D 91, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_2 =3D 92, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_3 =3D 93, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_4 =3D 94, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_GEN2_5 =3D 95, + CDNS_PCIE_LTSSM_LOOPBACK_SLAVE_ACTIVE =3D 96, + CDNS_PCIE_LTSSM_L1_ENTRY =3D 97, + CDNS_PCIE_LTSSM_L1_1 =3D 98, + CDNS_PCIE_LTSSM_L1_2 =3D 99, + CDNS_PCIE_LTSSM_L1_3 =3D 100, + CDNS_PCIE_LTSSM_L1_4 =3D 101, + CDNS_PCIE_LTSSM_L1_IDLE =3D 102, + CDNS_PCIE_LTSSM_L1_EXIT =3D 103, + CDNS_PCIE_LTSSM_L2_ENTRY =3D 104, + CDNS_PCIE_LTSSM_L2_1 =3D 105, + CDNS_PCIE_LTSSM_L2_2 =3D 106, + CDNS_PCIE_LTSSM_L2_3 =3D 107, + CDNS_PCIE_LTSSM_L2_4 =3D 108, + CDNS_PCIE_LTSSM_L2_5 =3D 109, + CDNS_PCIE_LTSSM_L2_IDLE =3D 110, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY =3D 111, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_1 =3D 112, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_2 =3D 113, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_3 =3D 114, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_4 =3D 115, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_5 =3D 116, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ENTRY_FROM_RECOVERY =3D 117, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_ACTIVE =3D 118, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_EXIT =3D 119, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_EXIT_1 =3D 120, + CDNS_PCIE_LTSSM_LOOPBACK_MASTER_EXIT_2 =3D 121, + CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE0 =3D 122, + CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE1 =3D 123, + CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE2_1 =3D 124, + CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE2_2 =3D 125, + CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE3_1 =3D 126, + CDNS_PCIE_LTSSM_RECOVERY_EQUALIZATION_PHASE3_2 =3D 127, +}; + struct cdns_pcie_ops { int (*start_link)(struct cdns_pcie *pcie); void (*stop_link)(struct cdns_pcie *pcie); @@ -87,6 +218,7 @@ struct cdns_plat_pcie_of_data { * @ops: Platform-specific ops to control various inputs from Cadence PCIe * wrapper * @cdns_pcie_reg_offsets: Register bank offsets for different SoC + * @debug_dir: debugfs node */ struct cdns_pcie { void __iomem *reg_base; @@ -100,6 +232,7 @@ struct cdns_pcie { struct device_link **link; const struct cdns_pcie_ops *ops; const struct cdns_plat_pcie_of_data *cdns_pcie_reg_offsets; + struct dentry *debug_dir; }; =20 /** @@ -522,4 +655,16 @@ bool cdns_pcie_hpa_link_up(struct cdns_pcie *pcie); =20 extern const struct dev_pm_ops cdns_pcie_pm_ops; =20 +#ifdef CONFIG_PCIE_CADENCE_DEBUGFS +void cdns_pcie_debugfs_deinit(struct cdns_pcie *pci); +void cdns_pcie_debugfs_init(struct cdns_pcie *pci); +#else +static inline void cdns_pcie_debugfs_deinit(struct cdns_pcie *pci) +{ +} +static inline void cdns_pcie_debugfs_init(struct cdns_pcie *pci) +{ +} +#endif + #endif /* _PCIE_CADENCE_H */ --=20 2.34.1