This is a note to let you know that I've just added the patch titled PCI: aardvark: Fix checking for link up via LTSSM state to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pci-aardvark-fix-checking-for-link-up-via-ltssm-state.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 661c399a651c11aaf83c45cbfe0b4a1fb7bc3179 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@xxxxxxxxxx> Date: Tue, 5 Oct 2021 20:09:51 +0200 Subject: PCI: aardvark: Fix checking for link up via LTSSM state MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pali Rohár <pali@xxxxxxxxxx> commit 661c399a651c11aaf83c45cbfe0b4a1fb7bc3179 upstream. Current implementation of advk_pcie_link_up() is wrong as it marks also link disabled or hot reset states as link up. Fix it by marking link up only to those states which are defined in PCIe Base specification 3.0, Table 4-14: Link Status Mapped to the LTSSM. To simplify implementation, Define macros for every LTSSM state which aardvark hardware can return in CFG_REG register. Fix also checking for link training according to the same Table 4-14. Define a new function advk_pcie_link_training() for this purpose. Link: https://lore.kernel.org/r/20211005180952.6812-13-kabel@xxxxxxxxxx Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver") Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> Signed-off-by: Marek Behún <kabel@xxxxxxxxxx> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> Reviewed-by: Marek Behún <kabel@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Cc: Remi Pommarel <repk@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/pci/controller/pci-aardvark.c | 76 +++++++++++++++++++++++++++++++--- 1 file changed, 70 insertions(+), 6 deletions(-) --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -164,8 +164,50 @@ #define CFG_REG (LMI_BASE_ADDR + 0x0) #define LTSSM_SHIFT 24 #define LTSSM_MASK 0x3f -#define LTSSM_L0 0x10 #define RC_BAR_CONFIG 0x300 + +/* LTSSM values in CFG_REG */ +enum { + LTSSM_DETECT_QUIET = 0x0, + LTSSM_DETECT_ACTIVE = 0x1, + LTSSM_POLLING_ACTIVE = 0x2, + LTSSM_POLLING_COMPLIANCE = 0x3, + LTSSM_POLLING_CONFIGURATION = 0x4, + LTSSM_CONFIG_LINKWIDTH_START = 0x5, + LTSSM_CONFIG_LINKWIDTH_ACCEPT = 0x6, + LTSSM_CONFIG_LANENUM_ACCEPT = 0x7, + LTSSM_CONFIG_LANENUM_WAIT = 0x8, + LTSSM_CONFIG_COMPLETE = 0x9, + LTSSM_CONFIG_IDLE = 0xa, + LTSSM_RECOVERY_RCVR_LOCK = 0xb, + LTSSM_RECOVERY_SPEED = 0xc, + LTSSM_RECOVERY_RCVR_CFG = 0xd, + LTSSM_RECOVERY_IDLE = 0xe, + LTSSM_L0 = 0x10, + LTSSM_RX_L0S_ENTRY = 0x11, + LTSSM_RX_L0S_IDLE = 0x12, + LTSSM_RX_L0S_FTS = 0x13, + LTSSM_TX_L0S_ENTRY = 0x14, + LTSSM_TX_L0S_IDLE = 0x15, + LTSSM_TX_L0S_FTS = 0x16, + LTSSM_L1_ENTRY = 0x17, + LTSSM_L1_IDLE = 0x18, + LTSSM_L2_IDLE = 0x19, + LTSSM_L2_TRANSMIT_WAKE = 0x1a, + LTSSM_DISABLED = 0x20, + LTSSM_LOOPBACK_ENTRY_MASTER = 0x21, + LTSSM_LOOPBACK_ACTIVE_MASTER = 0x22, + LTSSM_LOOPBACK_EXIT_MASTER = 0x23, + LTSSM_LOOPBACK_ENTRY_SLAVE = 0x24, + LTSSM_LOOPBACK_ACTIVE_SLAVE = 0x25, + LTSSM_LOOPBACK_EXIT_SLAVE = 0x26, + LTSSM_HOT_RESET = 0x27, + LTSSM_RECOVERY_EQUALIZATION_PHASE0 = 0x28, + LTSSM_RECOVERY_EQUALIZATION_PHASE1 = 0x29, + LTSSM_RECOVERY_EQUALIZATION_PHASE2 = 0x2a, + LTSSM_RECOVERY_EQUALIZATION_PHASE3 = 0x2b, +}; + #define VENDOR_ID_REG (LMI_BASE_ADDR + 0x44) /* PCIe core controller registers */ @@ -262,13 +304,35 @@ static inline u16 advk_read16(struct adv return advk_readl(pcie, (reg & ~0x3)) >> ((reg & 0x3) * 8); } -static int advk_pcie_link_up(struct advk_pcie *pcie) +static u8 advk_pcie_ltssm_state(struct advk_pcie *pcie) { - u32 val, ltssm_state; + u32 val; + u8 ltssm_state; val = advk_readl(pcie, CFG_REG); ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK; - return ltssm_state >= LTSSM_L0; + return ltssm_state; +} + +static inline bool advk_pcie_link_up(struct advk_pcie *pcie) +{ + /* check if LTSSM is in normal operation - some L* state */ + u8 ltssm_state = advk_pcie_ltssm_state(pcie); + return ltssm_state >= LTSSM_L0 && ltssm_state < LTSSM_DISABLED; +} + +static inline bool advk_pcie_link_training(struct advk_pcie *pcie) +{ + /* + * According to PCIe Base specification 3.0, Table 4-14: Link + * Status Mapped to the LTSSM is Link Training mapped to LTSSM + * Configuration and Recovery states. + */ + u8 ltssm_state = advk_pcie_ltssm_state(pcie); + return ((ltssm_state >= LTSSM_CONFIG_LINKWIDTH_START && + ltssm_state < LTSSM_L0) || + (ltssm_state >= LTSSM_RECOVERY_EQUALIZATION_PHASE0 && + ltssm_state <= LTSSM_RECOVERY_EQUALIZATION_PHASE3)); } static int advk_pcie_wait_for_link(struct advk_pcie *pcie) @@ -291,7 +355,7 @@ static void advk_pcie_wait_for_retrain(s size_t retries; for (retries = 0; retries < RETRAIN_WAIT_MAX_RETRIES; ++retries) { - if (!advk_pcie_link_up(pcie)) + if (advk_pcie_link_training(pcie)) break; udelay(RETRAIN_WAIT_USLEEP_US); } @@ -738,7 +802,7 @@ advk_pci_bridge_emul_pcie_conf_read(stru /* u32 contains both PCI_EXP_LNKCTL and PCI_EXP_LNKSTA */ u32 val = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg) & ~(PCI_EXP_LNKSTA_LT << 16); - if (!advk_pcie_link_up(pcie)) + if (advk_pcie_link_training(pcie)) val |= (PCI_EXP_LNKSTA_LT << 16); *value = val; return PCI_BRIDGE_EMUL_HANDLED; Patches currently in stable-queue which might be from pali@xxxxxxxxxx are queue-5.15/pci-aardvark-fix-reporting-data-link-layer-link-active.patch queue-5.15/pci-aardvark-fix-configuring-reference-clock.patch queue-5.15/pci-aardvark-fix-support-for-bus-mastering-and-pci_command-on-emulated-bridge.patch queue-5.15/pci-mark-atheros-qca6174-to-avoid-bus-reset.patch queue-5.15/serial-core-fix-initializing-and-restoring-termios-speed.patch queue-5.15/pci-pci-bridge-emul-fix-emulation-of-w1c-bits.patch queue-5.15/pci-aardvark-fix-support-for-pci_bridge_ctl_bus_reset-on-emulated-bridge.patch queue-5.15/pci-aardvark-fix-checking-for-link-up-via-ltssm-state.patch queue-5.15/pci-aardvark-fix-return-value-of-msi-domain-.alloc-method.patch queue-5.15/pci-aardvark-read-all-16-bits-from-pcie_msi_payload_reg.patch queue-5.15/pci-aardvark-do-not-unmask-unused-interrupts.patch queue-5.15/pci-aardvark-do-not-clear-status-bits-of-masked-interrupts.patch queue-5.15/pci-aardvark-set-pci-bridge-class-code-to-pci-bridge.patch queue-5.15/pci-aardvark-fix-support-for-pci_rom_address1-on-emulated-bridge.patch