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![Richard Fitzgerald](/assets/img/avatar_default.png)
A previous patch removed unnecessary zeroing of the page registers after a paged transaction, so now the reset_page_addr callback is unused and can be removed. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20230123164949.245898-3-rf@opensource.cirrus.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
677 lines
18 KiB
C
677 lines
18 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// Copyright(c) 2015-22 Intel Corporation.
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/*
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* Soundwire Intel Manager Driver
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*/
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#include <linux/acpi.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/auxiliary_bus.h>
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#include <sound/pcm_params.h>
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#include <linux/pm_runtime.h>
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#include <sound/soc.h>
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#include <linux/soundwire/sdw_registers.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_intel.h>
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#include "cadence_master.h"
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#include "bus.h"
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#include "intel.h"
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#include "intel_auxdevice.h"
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/* IDA min selected to avoid conflicts with HDaudio/iDISP SDI values */
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#define INTEL_DEV_NUM_IDA_MIN 4
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#define INTEL_MASTER_SUSPEND_DELAY_MS 3000
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/*
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* debug/config flags for the Intel SoundWire Master.
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*
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* Since we may have multiple masters active, we can have up to 8
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* flags reused in each byte, with master0 using the ls-byte, etc.
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*/
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#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME BIT(0)
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#define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP BIT(1)
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#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE BIT(2)
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#define SDW_INTEL_MASTER_DISABLE_MULTI_LINK BIT(3)
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static int md_flags;
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module_param_named(sdw_md_flags, md_flags, int, 0444);
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MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");
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static int generic_pre_bank_switch(struct sdw_bus *bus)
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{
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struct sdw_cdns *cdns = bus_to_cdns(bus);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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return sdw->link_res->hw_ops->pre_bank_switch(sdw);
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}
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static int generic_post_bank_switch(struct sdw_bus *bus)
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{
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struct sdw_cdns *cdns = bus_to_cdns(bus);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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return sdw->link_res->hw_ops->post_bank_switch(sdw);
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}
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static int sdw_master_read_intel_prop(struct sdw_bus *bus)
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{
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struct sdw_master_prop *prop = &bus->prop;
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struct fwnode_handle *link;
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char name[32];
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u32 quirk_mask;
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/* Find master handle */
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snprintf(name, sizeof(name),
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"mipi-sdw-link-%d-subproperties", bus->link_id);
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link = device_get_named_child_node(bus->dev, name);
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if (!link) {
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dev_err(bus->dev, "Master node %s not found\n", name);
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return -EIO;
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}
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fwnode_property_read_u32(link,
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"intel-sdw-ip-clock",
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&prop->mclk_freq);
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/* the values reported by BIOS are the 2x clock, not the bus clock */
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prop->mclk_freq /= 2;
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fwnode_property_read_u32(link,
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"intel-quirk-mask",
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&quirk_mask);
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if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
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prop->hw_disabled = true;
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prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
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SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
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return 0;
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}
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static int intel_prop_read(struct sdw_bus *bus)
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{
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/* Initialize with default handler to read all DisCo properties */
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sdw_master_read_prop(bus);
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/* read Intel-specific properties */
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sdw_master_read_intel_prop(bus);
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return 0;
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}
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static struct sdw_master_ops sdw_intel_ops = {
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.read_prop = intel_prop_read,
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.override_adr = sdw_dmi_override_adr,
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.xfer_msg = cdns_xfer_msg,
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.xfer_msg_defer = cdns_xfer_msg_defer,
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.set_bus_conf = cdns_bus_conf,
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.pre_bank_switch = generic_pre_bank_switch,
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.post_bank_switch = generic_post_bank_switch,
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.read_ping_status = cdns_read_ping_status,
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};
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/*
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* probe and init (aux_dev_id argument is required by function prototype but not used)
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*/
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static int intel_link_probe(struct auxiliary_device *auxdev,
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const struct auxiliary_device_id *aux_dev_id)
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{
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struct device *dev = &auxdev->dev;
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struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
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struct sdw_intel *sdw;
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struct sdw_cdns *cdns;
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struct sdw_bus *bus;
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int ret;
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sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
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if (!sdw)
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return -ENOMEM;
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cdns = &sdw->cdns;
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bus = &cdns->bus;
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sdw->instance = auxdev->id;
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sdw->link_res = &ldev->link_res;
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cdns->dev = dev;
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cdns->registers = sdw->link_res->registers;
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cdns->instance = sdw->instance;
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cdns->msg_count = 0;
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bus->link_id = auxdev->id;
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bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
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bus->clk_stop_timeout = 1;
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sdw_cdns_probe(cdns);
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/* Set ops */
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bus->ops = &sdw_intel_ops;
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/* set driver data, accessed by snd_soc_dai_get_drvdata() */
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auxiliary_set_drvdata(auxdev, cdns);
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/* use generic bandwidth allocation algorithm */
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sdw->cdns.bus.compute_params = sdw_compute_params;
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/* avoid resuming from pm_runtime suspend if it's not required */
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dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
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ret = sdw_bus_master_add(bus, dev, dev->fwnode);
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if (ret) {
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dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
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return ret;
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}
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if (bus->prop.hw_disabled)
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dev_info(dev,
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"SoundWire master %d is disabled, will be ignored\n",
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bus->link_id);
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/*
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* Ignore BIOS err_threshold, it's a really bad idea when dealing
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* with multiple hardware synchronized links
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*/
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bus->prop.err_threshold = 0;
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return 0;
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}
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int intel_link_startup(struct auxiliary_device *auxdev)
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{
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struct device *dev = &auxdev->dev;
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struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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struct sdw_bus *bus = &cdns->bus;
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int link_flags;
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bool multi_link;
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u32 clock_stop_quirks;
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int ret;
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if (bus->prop.hw_disabled) {
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dev_info(dev,
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"SoundWire master %d is disabled, ignoring\n",
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sdw->instance);
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return 0;
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}
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link_flags = md_flags >> (bus->link_id * 8);
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multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
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if (!multi_link) {
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dev_dbg(dev, "Multi-link is disabled\n");
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} else {
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/*
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* hardware-based synchronization is required regardless
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* of the number of segments used by a stream: SSP-based
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* synchronization is gated by gsync when the multi-master
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* mode is set.
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*/
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bus->hw_sync_min_links = 1;
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}
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bus->multi_link = multi_link;
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/* Initialize shim, controller */
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ret = sdw_intel_link_power_up(sdw);
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if (ret)
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goto err_init;
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/* Register DAIs */
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ret = sdw_intel_register_dai(sdw);
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if (ret) {
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dev_err(dev, "DAI registration failed: %d\n", ret);
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goto err_power_up;
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}
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sdw_intel_debugfs_init(sdw);
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/* start bus */
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ret = sdw_intel_start_bus(sdw);
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if (ret) {
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dev_err(dev, "bus start failed: %d\n", ret);
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goto err_power_up;
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}
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/* Enable runtime PM */
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if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
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pm_runtime_set_autosuspend_delay(dev,
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INTEL_MASTER_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_mark_last_busy(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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}
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clock_stop_quirks = sdw->link_res->clock_stop_quirks;
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if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
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/*
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* To keep the clock running we need to prevent
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* pm_runtime suspend from happening by increasing the
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* reference count.
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* This quirk is specified by the parent PCI device in
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* case of specific latency requirements. It will have
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* no effect if pm_runtime is disabled by the user via
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* a module parameter for testing purposes.
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*/
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pm_runtime_get_noresume(dev);
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}
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/*
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* The runtime PM status of Slave devices is "Unsupported"
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* until they report as ATTACHED. If they don't, e.g. because
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* there are no Slave devices populated or if the power-on is
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* delayed or dependent on a power switch, the Master will
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* remain active and prevent its parent from suspending.
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*
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* Conditionally force the pm_runtime core to re-evaluate the
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* Master status in the absence of any Slave activity. A quirk
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* is provided to e.g. deal with Slaves that may be powered on
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* with a delay. A more complete solution would require the
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* definition of Master properties.
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*/
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if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
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pm_runtime_idle(dev);
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sdw->startup_done = true;
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return 0;
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err_power_up:
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sdw_intel_link_power_down(sdw);
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err_init:
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return ret;
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}
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static void intel_link_remove(struct auxiliary_device *auxdev)
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{
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struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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struct sdw_bus *bus = &cdns->bus;
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/*
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* Since pm_runtime is already disabled, we don't decrease
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* the refcount when the clock_stop_quirk is
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* SDW_INTEL_CLK_STOP_NOT_ALLOWED
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*/
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if (!bus->prop.hw_disabled) {
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sdw_intel_debugfs_exit(sdw);
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sdw_cdns_enable_interrupt(cdns, false);
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}
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sdw_bus_master_delete(bus);
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}
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int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
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{
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struct device *dev = &auxdev->dev;
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struct sdw_intel *sdw;
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struct sdw_bus *bus;
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sdw = auxiliary_get_drvdata(auxdev);
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bus = &sdw->cdns.bus;
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if (bus->prop.hw_disabled || !sdw->startup_done) {
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dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
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bus->link_id);
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return 0;
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}
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if (!sdw_intel_shim_check_wake(sdw))
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return 0;
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/* disable WAKEEN interrupt ASAP to prevent interrupt flood */
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sdw_intel_shim_wake(sdw, false);
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/*
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* resume the Master, which will generate a bus reset and result in
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* Slaves re-attaching and be re-enumerated. The SoundWire physical
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* device which generated the wake will trigger an interrupt, which
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* will in turn cause the corresponding Linux Slave device to be
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* resumed and the Slave codec driver to check the status.
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*/
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pm_request_resume(dev);
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return 0;
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}
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/*
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* PM calls
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*/
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static int intel_resume_child_device(struct device *dev, void *data)
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{
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int ret;
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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if (!slave->probed) {
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dev_dbg(dev, "skipping device, no probed driver\n");
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return 0;
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}
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if (!slave->dev_num_sticky) {
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dev_dbg(dev, "skipping device, never detected on bus\n");
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return 0;
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}
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ret = pm_request_resume(dev);
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if (ret < 0)
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dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
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return ret;
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}
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static int __maybe_unused intel_pm_prepare(struct device *dev)
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{
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struct sdw_cdns *cdns = dev_get_drvdata(dev);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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struct sdw_bus *bus = &cdns->bus;
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u32 clock_stop_quirks;
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int ret;
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if (bus->prop.hw_disabled || !sdw->startup_done) {
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dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
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bus->link_id);
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return 0;
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}
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clock_stop_quirks = sdw->link_res->clock_stop_quirks;
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if (pm_runtime_suspended(dev) &&
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pm_runtime_suspended(dev->parent) &&
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((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
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!clock_stop_quirks)) {
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/*
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* if we've enabled clock stop, and the parent is suspended, the SHIM registers
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* are not accessible and the shim wake cannot be disabled.
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* The only solution is to resume the entire bus to full power
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*/
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/*
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* If any operation in this block fails, we keep going since we don't want
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* to prevent system suspend from happening and errors should be recoverable
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* on resume.
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*/
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/*
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* first resume the device for this link. This will also by construction
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* resume the PCI parent device.
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*/
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ret = pm_request_resume(dev);
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if (ret < 0) {
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dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret);
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return 0;
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}
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/*
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* Continue resuming the entire bus (parent + child devices) to exit
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* the clock stop mode. If there are no devices connected on this link
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* this is a no-op.
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* The resume to full power could have been implemented with a .prepare
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* step in SoundWire codec drivers. This would however require a lot
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* of code to handle an Intel-specific corner case. It is simpler in
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* practice to add a loop at the link level.
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*/
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ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
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if (ret < 0)
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dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
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}
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return 0;
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}
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static int __maybe_unused intel_suspend(struct device *dev)
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{
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struct sdw_cdns *cdns = dev_get_drvdata(dev);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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struct sdw_bus *bus = &cdns->bus;
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u32 clock_stop_quirks;
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int ret;
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if (bus->prop.hw_disabled || !sdw->startup_done) {
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dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
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bus->link_id);
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return 0;
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}
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if (pm_runtime_suspended(dev)) {
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dev_dbg(dev, "pm_runtime status: suspended\n");
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clock_stop_quirks = sdw->link_res->clock_stop_quirks;
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if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
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!clock_stop_quirks) {
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if (pm_runtime_suspended(dev->parent)) {
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/*
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* paranoia check: this should not happen with the .prepare
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* resume to full power
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*/
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dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
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} else {
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sdw_intel_shim_wake(sdw, false);
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}
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}
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return 0;
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}
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ret = sdw_intel_stop_bus(sdw, false);
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if (ret < 0) {
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dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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static int __maybe_unused intel_suspend_runtime(struct device *dev)
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{
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struct sdw_cdns *cdns = dev_get_drvdata(dev);
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struct sdw_intel *sdw = cdns_to_intel(cdns);
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struct sdw_bus *bus = &cdns->bus;
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u32 clock_stop_quirks;
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int ret;
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if (bus->prop.hw_disabled || !sdw->startup_done) {
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dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
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bus->link_id);
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return 0;
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}
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clock_stop_quirks = sdw->link_res->clock_stop_quirks;
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if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
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ret = sdw_intel_stop_bus(sdw, false);
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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");
|