From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/soundwire/intel_auxdevice.c | 678 ++++++++++++++++++++++++++++++++++++ 1 file changed, 678 insertions(+) create mode 100644 drivers/soundwire/intel_auxdevice.c (limited to 'drivers/soundwire/intel_auxdevice.c') diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c new file mode 100644 index 000000000..96c6b2112 --- /dev/null +++ b/drivers/soundwire/intel_auxdevice.c @@ -0,0 +1,678 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) +// Copyright(c) 2015-22 Intel Corporation. + +/* + * Soundwire Intel Manager Driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "cadence_master.h" +#include "bus.h" +#include "intel.h" +#include "intel_auxdevice.h" + +/* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */ +#define INTEL_DEV_NUM_IDA_MIN 4 + +#define INTEL_MASTER_SUSPEND_DELAY_MS 3000 + +/* + * debug/config flags for the Intel SoundWire Master. + * + * Since we may have multiple masters active, we can have up to 8 + * flags reused in each byte, with master0 using the ls-byte, etc. + */ + +#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME BIT(0) +#define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP BIT(1) +#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE BIT(2) +#define SDW_INTEL_MASTER_DISABLE_MULTI_LINK BIT(3) + +static int md_flags; +module_param_named(sdw_md_flags, md_flags, int, 0444); +MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)"); + +static int generic_pre_bank_switch(struct sdw_bus *bus) +{ + struct sdw_cdns *cdns = bus_to_cdns(bus); + struct sdw_intel *sdw = cdns_to_intel(cdns); + + return sdw->link_res->hw_ops->pre_bank_switch(sdw); +} + +static int generic_post_bank_switch(struct sdw_bus *bus) +{ + struct sdw_cdns *cdns = bus_to_cdns(bus); + struct sdw_intel *sdw = cdns_to_intel(cdns); + + return sdw->link_res->hw_ops->post_bank_switch(sdw); +} + +static int sdw_master_read_intel_prop(struct sdw_bus *bus) +{ + struct sdw_master_prop *prop = &bus->prop; + struct fwnode_handle *link; + char name[32]; + u32 quirk_mask; + + /* Find master handle */ + snprintf(name, sizeof(name), + "mipi-sdw-link-%d-subproperties", bus->link_id); + + link = device_get_named_child_node(bus->dev, name); + if (!link) { + dev_err(bus->dev, "Master node %s not found\n", name); + return -EIO; + } + + fwnode_property_read_u32(link, + "intel-sdw-ip-clock", + &prop->mclk_freq); + + /* the values reported by BIOS are the 2x clock, not the bus clock */ + prop->mclk_freq /= 2; + + fwnode_property_read_u32(link, + "intel-quirk-mask", + &quirk_mask); + + if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) + prop->hw_disabled = true; + + prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH | + SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY; + + return 0; +} + +static int intel_prop_read(struct sdw_bus *bus) +{ + /* Initialize with default handler to read all DisCo properties */ + sdw_master_read_prop(bus); + + /* read Intel-specific properties */ + sdw_master_read_intel_prop(bus); + + return 0; +} + +static struct sdw_master_ops sdw_intel_ops = { + .read_prop = intel_prop_read, + .override_adr = sdw_dmi_override_adr, + .xfer_msg = cdns_xfer_msg, + .xfer_msg_defer = cdns_xfer_msg_defer, + .reset_page_addr = cdns_reset_page_addr, + .set_bus_conf = cdns_bus_conf, + .pre_bank_switch = generic_pre_bank_switch, + .post_bank_switch = generic_post_bank_switch, + .read_ping_status = cdns_read_ping_status, +}; + +/* + * probe and init (aux_dev_id argument is required by function prototype but not used) + */ +static int intel_link_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *aux_dev_id) + +{ + struct device *dev = &auxdev->dev; + struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev); + struct sdw_intel *sdw; + struct sdw_cdns *cdns; + struct sdw_bus *bus; + int ret; + + sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL); + if (!sdw) + return -ENOMEM; + + cdns = &sdw->cdns; + bus = &cdns->bus; + + sdw->instance = auxdev->id; + sdw->link_res = &ldev->link_res; + cdns->dev = dev; + cdns->registers = sdw->link_res->registers; + cdns->instance = sdw->instance; + cdns->msg_count = 0; + + bus->link_id = auxdev->id; + bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN; + bus->clk_stop_timeout = 1; + + sdw_cdns_probe(cdns); + + /* Set ops */ + bus->ops = &sdw_intel_ops; + + /* set driver data, accessed by snd_soc_dai_get_drvdata() */ + auxiliary_set_drvdata(auxdev, cdns); + + /* use generic bandwidth allocation algorithm */ + sdw->cdns.bus.compute_params = sdw_compute_params; + + /* avoid resuming from pm_runtime suspend if it's not required */ + dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND); + + ret = sdw_bus_master_add(bus, dev, dev->fwnode); + if (ret) { + dev_err(dev, "sdw_bus_master_add fail: %d\n", ret); + return ret; + } + + if (bus->prop.hw_disabled) + dev_info(dev, + "SoundWire master %d is disabled, will be ignored\n", + bus->link_id); + /* + * Ignore BIOS err_threshold, it's a really bad idea when dealing + * with multiple hardware synchronized links + */ + bus->prop.err_threshold = 0; + + return 0; +} + +int intel_link_startup(struct auxiliary_device *auxdev) +{ + struct device *dev = &auxdev->dev; + struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + int link_flags; + bool multi_link; + u32 clock_stop_quirks; + int ret; + + if (bus->prop.hw_disabled) { + dev_info(dev, + "SoundWire master %d is disabled, ignoring\n", + sdw->instance); + return 0; + } + + link_flags = md_flags >> (bus->link_id * 8); + multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK); + if (!multi_link) { + dev_dbg(dev, "Multi-link is disabled\n"); + } else { + /* + * hardware-based synchronization is required regardless + * of the number of segments used by a stream: SSP-based + * synchronization is gated by gsync when the multi-master + * mode is set. + */ + bus->hw_sync_min_links = 1; + } + bus->multi_link = multi_link; + + /* Initialize shim, controller */ + ret = sdw_intel_link_power_up(sdw); + if (ret) + goto err_init; + + /* Register DAIs */ + ret = sdw_intel_register_dai(sdw); + if (ret) { + dev_err(dev, "DAI registration failed: %d\n", ret); + goto err_power_up; + } + + sdw_intel_debugfs_init(sdw); + + /* start bus */ + ret = sdw_intel_start_bus(sdw); + if (ret) { + dev_err(dev, "bus start failed: %d\n", ret); + goto err_power_up; + } + + /* Enable runtime PM */ + if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) { + pm_runtime_set_autosuspend_delay(dev, + INTEL_MASTER_SUSPEND_DELAY_MS); + pm_runtime_use_autosuspend(dev); + pm_runtime_mark_last_busy(dev); + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + } + + clock_stop_quirks = sdw->link_res->clock_stop_quirks; + if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) { + /* + * To keep the clock running we need to prevent + * pm_runtime suspend from happening by increasing the + * reference count. + * This quirk is specified by the parent PCI device in + * case of specific latency requirements. It will have + * no effect if pm_runtime is disabled by the user via + * a module parameter for testing purposes. + */ + pm_runtime_get_noresume(dev); + } + + /* + * The runtime PM status of Slave devices is "Unsupported" + * until they report as ATTACHED. If they don't, e.g. because + * there are no Slave devices populated or if the power-on is + * delayed or dependent on a power switch, the Master will + * remain active and prevent its parent from suspending. + * + * Conditionally force the pm_runtime core to re-evaluate the + * Master status in the absence of any Slave activity. A quirk + * is provided to e.g. deal with Slaves that may be powered on + * with a delay. A more complete solution would require the + * definition of Master properties. + */ + if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) + pm_runtime_idle(dev); + + sdw->startup_done = true; + return 0; + +err_power_up: + sdw_intel_link_power_down(sdw); +err_init: + return ret; +} + +static void intel_link_remove(struct auxiliary_device *auxdev) +{ + struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + + /* + * Since pm_runtime is already disabled, we don't decrease + * the refcount when the clock_stop_quirk is + * SDW_INTEL_CLK_STOP_NOT_ALLOWED + */ + if (!bus->prop.hw_disabled) { + sdw_intel_debugfs_exit(sdw); + sdw_cdns_enable_interrupt(cdns, false); + } + sdw_bus_master_delete(bus); +} + +int intel_link_process_wakeen_event(struct auxiliary_device *auxdev) +{ + struct device *dev = &auxdev->dev; + struct sdw_intel *sdw; + struct sdw_bus *bus; + + sdw = auxiliary_get_drvdata(auxdev); + bus = &sdw->cdns.bus; + + if (bus->prop.hw_disabled || !sdw->startup_done) { + dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", + bus->link_id); + return 0; + } + + if (!sdw_intel_shim_check_wake(sdw)) + return 0; + + /* disable WAKEEN interrupt ASAP to prevent interrupt flood */ + sdw_intel_shim_wake(sdw, false); + + /* + * resume the Master, which will generate a bus reset and result in + * Slaves re-attaching and be re-enumerated. The SoundWire physical + * device which generated the wake will trigger an interrupt, which + * will in turn cause the corresponding Linux Slave device to be + * resumed and the Slave codec driver to check the status. + */ + pm_request_resume(dev); + + return 0; +} + +/* + * PM calls + */ + +static int intel_resume_child_device(struct device *dev, void *data) +{ + int ret; + struct sdw_slave *slave = dev_to_sdw_dev(dev); + + if (!slave->probed) { + dev_dbg(dev, "skipping device, no probed driver\n"); + return 0; + } + if (!slave->dev_num_sticky) { + dev_dbg(dev, "skipping device, never detected on bus\n"); + return 0; + } + + ret = pm_request_resume(dev); + if (ret < 0) + dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); + + return ret; +} + +static int __maybe_unused intel_pm_prepare(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + u32 clock_stop_quirks; + int ret; + + if (bus->prop.hw_disabled || !sdw->startup_done) { + dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", + bus->link_id); + return 0; + } + + clock_stop_quirks = sdw->link_res->clock_stop_quirks; + + if (pm_runtime_suspended(dev) && + pm_runtime_suspended(dev->parent) && + ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || + !clock_stop_quirks)) { + /* + * if we've enabled clock stop, and the parent is suspended, the SHIM registers + * are not accessible and the shim wake cannot be disabled. + * The only solution is to resume the entire bus to full power + */ + + /* + * If any operation in this block fails, we keep going since we don't want + * to prevent system suspend from happening and errors should be recoverable + * on resume. + */ + + /* + * first resume the device for this link. This will also by construction + * resume the PCI parent device. + */ + ret = pm_request_resume(dev); + if (ret < 0) { + dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); + return 0; + } + + /* + * Continue resuming the entire bus (parent + child devices) to exit + * the clock stop mode. If there are no devices connected on this link + * this is a no-op. + * The resume to full power could have been implemented with a .prepare + * step in SoundWire codec drivers. This would however require a lot + * of code to handle an Intel-specific corner case. It is simpler in + * practice to add a loop at the link level. + */ + ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device); + + if (ret < 0) + dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret); + } + + return 0; +} + +static int __maybe_unused intel_suspend(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + u32 clock_stop_quirks; + int ret; + + if (bus->prop.hw_disabled || !sdw->startup_done) { + dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", + bus->link_id); + return 0; + } + + if (pm_runtime_suspended(dev)) { + dev_dbg(dev, "pm_runtime status: suspended\n"); + + clock_stop_quirks = sdw->link_res->clock_stop_quirks; + + if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) || + !clock_stop_quirks) { + + if (pm_runtime_suspended(dev->parent)) { + /* + * paranoia check: this should not happen with the .prepare + * resume to full power + */ + dev_err(dev, "%s: invalid config: parent is suspended\n", __func__); + } else { + sdw_intel_shim_wake(sdw, false); + } + } + + return 0; + } + + ret = sdw_intel_stop_bus(sdw, false); + if (ret < 0) { + dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret); + return ret; + } + + return 0; +} + +static int __maybe_unused intel_suspend_runtime(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + u32 clock_stop_quirks; + int ret; + + if (bus->prop.hw_disabled || !sdw->startup_done) { + dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", + bus->link_id); + return 0; + } + + clock_stop_quirks = sdw->link_res->clock_stop_quirks; + + if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { + ret = sdw_intel_stop_bus(sdw, false); + if (ret < 0) { + dev_err(dev, "%s: cannot stop bus during teardown: %d\n", + __func__, ret); + return ret; + } + } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) { + ret = sdw_intel_stop_bus(sdw, true); + if (ret < 0) { + dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n", + __func__, ret); + return ret; + } + } else { + dev_err(dev, "%s clock_stop_quirks %x unsupported\n", + __func__, clock_stop_quirks); + ret = -EINVAL; + } + + return ret; +} + +static int __maybe_unused intel_resume(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + int link_flags; + int ret; + + if (bus->prop.hw_disabled || !sdw->startup_done) { + dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", + bus->link_id); + return 0; + } + + link_flags = md_flags >> (bus->link_id * 8); + + if (pm_runtime_suspended(dev)) { + dev_dbg(dev, "pm_runtime status was suspended, forcing active\n"); + + /* follow required sequence from runtime_pm.rst */ + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_enable(dev); + + link_flags = md_flags >> (bus->link_id * 8); + + if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) + pm_runtime_idle(dev); + } + + ret = sdw_intel_link_power_up(sdw); + if (ret) { + dev_err(dev, "%s failed: %d\n", __func__, ret); + return ret; + } + + /* + * make sure all Slaves are tagged as UNATTACHED and provide + * reason for reinitialization + */ + sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); + + ret = sdw_intel_start_bus(sdw); + if (ret < 0) { + dev_err(dev, "cannot start bus during resume\n"); + sdw_intel_link_power_down(sdw); + return ret; + } + + /* + * after system resume, the pm_runtime suspend() may kick in + * during the enumeration, before any children device force the + * master device to remain active. Using pm_runtime_get() + * routines is not really possible, since it'd prevent the + * master from suspending. + * A reasonable compromise is to update the pm_runtime + * counters and delay the pm_runtime suspend by several + * seconds, by when all enumeration should be complete. + */ + pm_runtime_mark_last_busy(dev); + + return 0; +} + +static int __maybe_unused intel_resume_runtime(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + u32 clock_stop_quirks; + int ret; + + if (bus->prop.hw_disabled || !sdw->startup_done) { + dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n", + bus->link_id); + return 0; + } + + /* unconditionally disable WAKEEN interrupt */ + sdw_intel_shim_wake(sdw, false); + + clock_stop_quirks = sdw->link_res->clock_stop_quirks; + + if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) { + ret = sdw_intel_link_power_up(sdw); + if (ret) { + dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret); + return ret; + } + + /* + * make sure all Slaves are tagged as UNATTACHED and provide + * reason for reinitialization + */ + sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); + + ret = sdw_intel_start_bus(sdw); + if (ret < 0) { + dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret); + sdw_intel_link_power_down(sdw); + return ret; + } + + } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) { + ret = sdw_intel_link_power_up(sdw); + if (ret) { + dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret); + return ret; + } + + ret = sdw_intel_start_bus_after_reset(sdw); + if (ret < 0) { + dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret); + sdw_intel_link_power_down(sdw); + return ret; + } + } else if (!clock_stop_quirks) { + + sdw_intel_check_clock_stop(sdw); + + ret = sdw_intel_link_power_up(sdw); + if (ret) { + dev_err(dev, "%s: power_up failed: %d\n", __func__, ret); + return ret; + } + + ret = sdw_intel_start_bus_after_clock_stop(sdw); + if (ret < 0) { + dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret); + sdw_intel_link_power_down(sdw); + return ret; + } + } else { + dev_err(dev, "%s: clock_stop_quirks %x unsupported\n", + __func__, clock_stop_quirks); + ret = -EINVAL; + } + + return ret; +} + +static const struct dev_pm_ops intel_pm = { + .prepare = intel_pm_prepare, + SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) + SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL) +}; + +static const struct auxiliary_device_id intel_link_id_table[] = { + { .name = "soundwire_intel.link" }, + {}, +}; +MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table); + +static struct auxiliary_driver sdw_intel_drv = { + .probe = intel_link_probe, + .remove = intel_link_remove, + .driver = { + /* auxiliary_driver_register() sets .name to be the modname */ + .pm = &intel_pm, + }, + .id_table = intel_link_id_table +}; +module_auxiliary_driver(sdw_intel_drv); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("Intel Soundwire Link Driver"); -- cgit v1.2.3