1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
4 #include <linux/acpi.h>
5 #include <linux/delay.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/pm_runtime.h>
8 #include <linux/soundwire/sdw_registers.h>
9 #include <linux/soundwire/sdw.h>
10 #include <linux/soundwire/sdw_type.h>
12 #include "sysfs_local.h"
14 static DEFINE_IDA(sdw_ida);
16 static int sdw_get_id(struct sdw_bus *bus)
18 int rc = ida_alloc(&sdw_ida, GFP_KERNEL);
28 * sdw_bus_master_add() - add a bus Master instance
30 * @parent: parent device
31 * @fwnode: firmware node handle
33 * Initializes the bus instance, read properties and create child
36 int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
37 struct fwnode_handle *fwnode)
39 struct sdw_master_prop *prop = NULL;
43 pr_err("SoundWire parent device is not set\n");
47 ret = sdw_get_id(bus);
49 dev_err(parent, "Failed to get bus id\n");
53 ret = sdw_master_device_add(bus, parent, fwnode);
55 dev_err(parent, "Failed to add master device at link %d\n",
61 dev_err(bus->dev, "SoundWire Bus ops are not set\n");
65 if (!bus->compute_params) {
67 "Bandwidth allocation not configured, compute_params no set\n");
71 mutex_init(&bus->msg_lock);
72 mutex_init(&bus->bus_lock);
73 INIT_LIST_HEAD(&bus->slaves);
74 INIT_LIST_HEAD(&bus->m_rt_list);
77 * Initialize multi_link flag
78 * TODO: populate this flag by reading property from FW node
80 bus->multi_link = false;
81 if (bus->ops->read_prop) {
82 ret = bus->ops->read_prop(bus);
85 "Bus read properties failed:%d\n", ret);
90 sdw_bus_debugfs_init(bus);
93 * Device numbers in SoundWire are 0 through 15. Enumeration device
94 * number (0), Broadcast device number (15), Group numbers (12 and
95 * 13) and Master device number (14) are not used for assignment so
96 * mask these and other higher bits.
99 /* Set higher order bits */
100 *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
102 /* Set enumuration device number and broadcast device number */
103 set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
104 set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
106 /* Set group device numbers and master device number */
107 set_bit(SDW_GROUP12_DEV_NUM, bus->assigned);
108 set_bit(SDW_GROUP13_DEV_NUM, bus->assigned);
109 set_bit(SDW_MASTER_DEV_NUM, bus->assigned);
112 * SDW is an enumerable bus, but devices can be powered off. So,
113 * they won't be able to report as present.
115 * Create Slave devices based on Slaves described in
116 * the respective firmware (ACPI/DT)
118 if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev))
119 ret = sdw_acpi_find_slaves(bus);
120 else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node)
121 ret = sdw_of_find_slaves(bus);
123 ret = -ENOTSUPP; /* No ACPI/DT so error out */
126 dev_err(bus->dev, "Finding slaves failed:%d\n", ret);
131 * Initialize clock values based on Master properties. The max
132 * frequency is read from max_clk_freq property. Current assumption
133 * is that the bus will start at highest clock frequency when
136 * Default active bank will be 0 as out of reset the Slaves have
137 * to start with bank 0 (Table 40 of Spec)
140 bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR;
141 bus->params.curr_dr_freq = bus->params.max_dr_freq;
142 bus->params.curr_bank = SDW_BANK0;
143 bus->params.next_bank = SDW_BANK1;
147 EXPORT_SYMBOL(sdw_bus_master_add);
149 static int sdw_delete_slave(struct device *dev, void *data)
151 struct sdw_slave *slave = dev_to_sdw_dev(dev);
152 struct sdw_bus *bus = slave->bus;
154 pm_runtime_disable(dev);
156 sdw_slave_debugfs_exit(slave);
158 mutex_lock(&bus->bus_lock);
160 if (slave->dev_num) /* clear dev_num if assigned */
161 clear_bit(slave->dev_num, bus->assigned);
163 list_del_init(&slave->node);
164 mutex_unlock(&bus->bus_lock);
166 device_unregister(dev);
171 * sdw_bus_master_delete() - delete the bus master instance
172 * @bus: bus to be deleted
174 * Remove the instance, delete the child devices.
176 void sdw_bus_master_delete(struct sdw_bus *bus)
178 device_for_each_child(bus->dev, NULL, sdw_delete_slave);
179 sdw_master_device_del(bus);
181 sdw_bus_debugfs_exit(bus);
182 ida_free(&sdw_ida, bus->id);
184 EXPORT_SYMBOL(sdw_bus_master_delete);
190 static inline int find_response_code(enum sdw_command_response resp)
196 case SDW_CMD_IGNORED:
199 case SDW_CMD_TIMEOUT:
207 static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
209 int retry = bus->prop.err_threshold;
210 enum sdw_command_response resp;
213 for (i = 0; i <= retry; i++) {
214 resp = bus->ops->xfer_msg(bus, msg);
215 ret = find_response_code(resp);
217 /* if cmd is ok or ignored return */
218 if (ret == 0 || ret == -ENODATA)
225 static inline int do_transfer_defer(struct sdw_bus *bus,
227 struct sdw_defer *defer)
229 int retry = bus->prop.err_threshold;
230 enum sdw_command_response resp;
234 defer->length = msg->len;
235 init_completion(&defer->complete);
237 for (i = 0; i <= retry; i++) {
238 resp = bus->ops->xfer_msg_defer(bus, msg, defer);
239 ret = find_response_code(resp);
240 /* if cmd is ok or ignored return */
241 if (ret == 0 || ret == -ENODATA)
248 static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
250 int retry = bus->prop.err_threshold;
251 enum sdw_command_response resp;
254 for (i = 0; i <= retry; i++) {
255 resp = bus->ops->reset_page_addr(bus, dev_num);
256 ret = find_response_code(resp);
257 /* if cmd is ok or ignored return */
258 if (ret == 0 || ret == -ENODATA)
265 static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg)
269 ret = do_transfer(bus, msg);
270 if (ret != 0 && ret != -ENODATA)
271 dev_err(bus->dev, "trf on Slave %d failed:%d %s addr %x count %d\n",
273 (msg->flags & SDW_MSG_FLAG_WRITE) ? "write" : "read",
274 msg->addr, msg->len);
277 sdw_reset_page(bus, msg->dev_num);
283 * sdw_transfer() - Synchronous transfer message to a SDW Slave device
285 * @msg: SDW message to be xfered
287 int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
291 mutex_lock(&bus->msg_lock);
293 ret = sdw_transfer_unlocked(bus, msg);
295 mutex_unlock(&bus->msg_lock);
301 * sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device
303 * @msg: SDW message to be xfered
304 * @defer: Defer block for signal completion
306 * Caller needs to hold the msg_lock lock while calling this
308 int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
309 struct sdw_defer *defer)
313 if (!bus->ops->xfer_msg_defer)
316 ret = do_transfer_defer(bus, msg, defer);
317 if (ret != 0 && ret != -ENODATA)
318 dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
322 sdw_reset_page(bus, msg->dev_num);
327 int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
328 u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
330 memset(msg, 0, sizeof(*msg));
331 msg->addr = addr; /* addr is 16 bit and truncated here */
333 msg->dev_num = dev_num;
337 if (addr < SDW_REG_NO_PAGE) /* no paging area */
340 if (addr >= SDW_REG_MAX) { /* illegal addr */
341 pr_err("SDW: Invalid address %x passed\n", addr);
345 if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */
346 if (slave && !slave->prop.paging_support)
348 /* no need for else as that will fall-through to paging */
351 /* paging mandatory */
352 if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
353 pr_err("SDW: Invalid device for paging :%d\n", dev_num);
358 pr_err("SDW: No slave for paging addr\n");
362 if (!slave->prop.paging_support) {
364 "address %x needs paging but no support\n", addr);
368 msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr);
369 msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr);
370 msg->addr |= BIT(15);
377 * Read/Write IO functions.
378 * no_pm versions can only be called by the bus, e.g. while enumerating or
379 * handling suspend-resume sequences.
380 * all clients need to use the pm versions
384 sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
389 ret = sdw_fill_msg(&msg, slave, addr, count,
390 slave->dev_num, SDW_MSG_FLAG_READ, val);
394 ret = sdw_transfer(slave->bus, &msg);
395 if (slave->is_mockup_device)
401 sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
406 ret = sdw_fill_msg(&msg, slave, addr, count,
407 slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val);
411 ret = sdw_transfer(slave->bus, &msg);
412 if (slave->is_mockup_device)
417 int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
419 return sdw_nwrite_no_pm(slave, addr, 1, &value);
421 EXPORT_SYMBOL(sdw_write_no_pm);
424 sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr)
430 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
431 SDW_MSG_FLAG_READ, &buf);
435 ret = sdw_transfer(bus, &msg);
443 sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
448 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
449 SDW_MSG_FLAG_WRITE, &value);
453 return sdw_transfer(bus, &msg);
456 int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr)
462 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
463 SDW_MSG_FLAG_READ, &buf);
467 ret = sdw_transfer_unlocked(bus, &msg);
473 EXPORT_SYMBOL(sdw_bread_no_pm_unlocked);
475 int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
480 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
481 SDW_MSG_FLAG_WRITE, &value);
485 return sdw_transfer_unlocked(bus, &msg);
487 EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked);
489 int sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
494 ret = sdw_nread_no_pm(slave, addr, 1, &buf);
500 EXPORT_SYMBOL(sdw_read_no_pm);
502 int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
506 tmp = sdw_read_no_pm(slave, addr);
510 tmp = (tmp & ~mask) | val;
511 return sdw_write_no_pm(slave, addr, tmp);
513 EXPORT_SYMBOL(sdw_update_no_pm);
515 /* Read-Modify-Write Slave register */
516 int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
520 tmp = sdw_read(slave, addr);
524 tmp = (tmp & ~mask) | val;
525 return sdw_write(slave, addr, tmp);
527 EXPORT_SYMBOL(sdw_update);
530 * sdw_nread() - Read "n" contiguous SDW Slave registers
532 * @addr: Register address
534 * @val: Buffer for values to be read
536 int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
540 ret = pm_runtime_resume_and_get(&slave->dev);
541 if (ret < 0 && ret != -EACCES)
544 ret = sdw_nread_no_pm(slave, addr, count, val);
546 pm_runtime_mark_last_busy(&slave->dev);
547 pm_runtime_put(&slave->dev);
551 EXPORT_SYMBOL(sdw_nread);
554 * sdw_nwrite() - Write "n" contiguous SDW Slave registers
556 * @addr: Register address
558 * @val: Buffer for values to be written
560 int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
564 ret = pm_runtime_resume_and_get(&slave->dev);
565 if (ret < 0 && ret != -EACCES)
568 ret = sdw_nwrite_no_pm(slave, addr, count, val);
570 pm_runtime_mark_last_busy(&slave->dev);
571 pm_runtime_put(&slave->dev);
575 EXPORT_SYMBOL(sdw_nwrite);
578 * sdw_read() - Read a SDW Slave register
580 * @addr: Register address
582 int sdw_read(struct sdw_slave *slave, u32 addr)
587 ret = sdw_nread(slave, addr, 1, &buf);
593 EXPORT_SYMBOL(sdw_read);
596 * sdw_write() - Write a SDW Slave register
598 * @addr: Register address
599 * @value: Register value
601 int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
603 return sdw_nwrite(slave, addr, 1, &value);
605 EXPORT_SYMBOL(sdw_write);
611 /* called with bus_lock held */
612 static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
614 struct sdw_slave *slave;
616 list_for_each_entry(slave, &bus->slaves, node) {
617 if (slave->dev_num == i)
624 int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
626 if (slave->id.mfg_id != id.mfg_id ||
627 slave->id.part_id != id.part_id ||
628 slave->id.class_id != id.class_id ||
629 (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID &&
630 slave->id.unique_id != id.unique_id))
635 EXPORT_SYMBOL(sdw_compare_devid);
637 /* called with bus_lock held */
638 static int sdw_get_device_num(struct sdw_slave *slave)
642 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
643 if (bit == SDW_MAX_DEVICES) {
649 * Do not update dev_num in Slave data structure here,
650 * Update once program dev_num is successful
652 set_bit(bit, slave->bus->assigned);
658 static int sdw_assign_device_num(struct sdw_slave *slave)
660 struct sdw_bus *bus = slave->bus;
662 bool new_device = false;
664 /* check first if device number is assigned, if so reuse that */
665 if (!slave->dev_num) {
666 if (!slave->dev_num_sticky) {
667 mutex_lock(&slave->bus->bus_lock);
668 dev_num = sdw_get_device_num(slave);
669 mutex_unlock(&slave->bus->bus_lock);
671 dev_err(bus->dev, "Get dev_num failed: %d\n",
675 slave->dev_num = dev_num;
676 slave->dev_num_sticky = dev_num;
679 slave->dev_num = slave->dev_num_sticky;
685 "Slave already registered, reusing dev_num:%d\n",
688 /* Clear the slave->dev_num to transfer message on device 0 */
689 dev_num = slave->dev_num;
692 ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
694 dev_err(bus->dev, "Program device_num %d failed: %d\n",
699 /* After xfer of msg, restore dev_num */
700 slave->dev_num = slave->dev_num_sticky;
705 void sdw_extract_slave_id(struct sdw_bus *bus,
706 u64 addr, struct sdw_slave_id *id)
708 dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr);
710 id->sdw_version = SDW_VERSION(addr);
711 id->unique_id = SDW_UNIQUE_ID(addr);
712 id->mfg_id = SDW_MFG_ID(addr);
713 id->part_id = SDW_PART_ID(addr);
714 id->class_id = SDW_CLASS_ID(addr);
717 "SDW Slave class_id 0x%02x, mfg_id 0x%04x, part_id 0x%04x, unique_id 0x%x, version 0x%x\n",
718 id->class_id, id->mfg_id, id->part_id, id->unique_id, id->sdw_version);
720 EXPORT_SYMBOL(sdw_extract_slave_id);
722 static int sdw_program_device_num(struct sdw_bus *bus)
724 u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
725 struct sdw_slave *slave, *_s;
726 struct sdw_slave_id id;
732 /* No Slave, so use raw xfer api */
733 ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
734 SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
739 ret = sdw_transfer(bus, &msg);
740 if (ret == -ENODATA) { /* end of device id reads */
741 dev_dbg(bus->dev, "No more devices to enumerate\n");
746 dev_err(bus->dev, "DEVID read fail:%d\n", ret);
751 * Construct the addr and extract. Cast the higher shift
752 * bits to avoid truncation due to size limit.
754 addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
755 ((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
758 sdw_extract_slave_id(bus, addr, &id);
761 /* Now compare with entries */
762 list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
763 if (sdw_compare_devid(slave, id) == 0) {
767 * Assign a new dev_num to this Slave and
768 * not mark it present. It will be marked
769 * present after it reports ATTACHED on new
772 ret = sdw_assign_device_num(slave);
775 "Assign dev_num failed:%d\n",
785 /* TODO: Park this device in Group 13 */
788 * add Slave device even if there is no platform
789 * firmware description. There will be no driver probe
790 * but the user/integration will be able to see the
791 * device, enumeration status and device number in sysfs
793 sdw_slave_add(bus, &id, NULL);
795 dev_err(bus->dev, "Slave Entry not found\n");
801 * Check till error out or retry (count) exhausts.
802 * Device can drop off and rejoin during enumeration
803 * so count till twice the bound.
806 } while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
811 static void sdw_modify_slave_status(struct sdw_slave *slave,
812 enum sdw_slave_status status)
814 struct sdw_bus *bus = slave->bus;
816 mutex_lock(&bus->bus_lock);
819 "%s: changing status slave %d status %d new status %d\n",
820 __func__, slave->dev_num, slave->status, status);
822 if (status == SDW_SLAVE_UNATTACHED) {
824 "%s: initializing enumeration and init completion for Slave %d\n",
825 __func__, slave->dev_num);
827 init_completion(&slave->enumeration_complete);
828 init_completion(&slave->initialization_complete);
830 } else if ((status == SDW_SLAVE_ATTACHED) &&
831 (slave->status == SDW_SLAVE_UNATTACHED)) {
833 "%s: signaling enumeration completion for Slave %d\n",
834 __func__, slave->dev_num);
836 complete(&slave->enumeration_complete);
838 slave->status = status;
839 mutex_unlock(&bus->bus_lock);
842 static int sdw_slave_clk_stop_callback(struct sdw_slave *slave,
843 enum sdw_clk_stop_mode mode,
844 enum sdw_clk_stop_type type)
848 mutex_lock(&slave->sdw_dev_lock);
851 struct device *dev = &slave->dev;
852 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
854 if (drv->ops && drv->ops->clk_stop)
855 ret = drv->ops->clk_stop(slave, mode, type);
858 mutex_unlock(&slave->sdw_dev_lock);
863 static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
864 enum sdw_clk_stop_mode mode,
871 wake_en = slave->prop.wake_capable;
874 val = SDW_SCP_SYSTEMCTRL_CLK_STP_PREP;
876 if (mode == SDW_CLK_STOP_MODE1)
877 val |= SDW_SCP_SYSTEMCTRL_CLK_STP_MODE1;
880 val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
882 ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
885 dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
889 val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
892 ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val);
894 if (ret < 0 && ret != -ENODATA)
895 dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL write failed:%d\n", ret);
900 static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
902 int retry = bus->clk_stop_timeout;
906 val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
909 dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
912 val &= SDW_SCP_STAT_CLK_STP_NF;
914 dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d\n",
919 usleep_range(1000, 1500);
923 dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d\n",
930 * sdw_bus_prep_clk_stop: prepare Slave(s) for clock stop
932 * @bus: SDW bus instance
934 * Query Slave for clock stop mode and prepare for that mode.
936 int sdw_bus_prep_clk_stop(struct sdw_bus *bus)
938 bool simple_clk_stop = true;
939 struct sdw_slave *slave;
940 bool is_slave = false;
944 * In order to save on transition time, prepare
945 * each Slave and then wait for all Slave(s) to be
946 * prepared for clock stop.
947 * If one of the Slave devices has lost sync and
948 * replies with Command Ignored/-ENODATA, we continue
951 list_for_each_entry(slave, &bus->slaves, node) {
955 if (slave->status != SDW_SLAVE_ATTACHED &&
956 slave->status != SDW_SLAVE_ALERT)
959 /* Identify if Slave(s) are available on Bus */
962 ret = sdw_slave_clk_stop_callback(slave,
964 SDW_CLK_PRE_PREPARE);
965 if (ret < 0 && ret != -ENODATA) {
966 dev_err(&slave->dev, "clock stop pre-prepare cb failed:%d\n", ret);
970 /* Only prepare a Slave device if needed */
971 if (!slave->prop.simple_clk_stop_capable) {
972 simple_clk_stop = false;
974 ret = sdw_slave_clk_stop_prepare(slave,
977 if (ret < 0 && ret != -ENODATA) {
978 dev_err(&slave->dev, "clock stop prepare failed:%d\n", ret);
984 /* Skip remaining clock stop preparation if no Slave is attached */
989 * Don't wait for all Slaves to be ready if they follow the simple
992 if (!simple_clk_stop) {
993 ret = sdw_bus_wait_for_clk_prep_deprep(bus,
994 SDW_BROADCAST_DEV_NUM);
996 * if there are no Slave devices present and the reply is
997 * Command_Ignored/-ENODATA, we don't need to continue with the
998 * flow and can just return here. The error code is not modified
999 * and its handling left as an exercise for the caller.
1005 /* Inform slaves that prep is done */
1006 list_for_each_entry(slave, &bus->slaves, node) {
1007 if (!slave->dev_num)
1010 if (slave->status != SDW_SLAVE_ATTACHED &&
1011 slave->status != SDW_SLAVE_ALERT)
1014 ret = sdw_slave_clk_stop_callback(slave,
1016 SDW_CLK_POST_PREPARE);
1018 if (ret < 0 && ret != -ENODATA) {
1019 dev_err(&slave->dev, "clock stop post-prepare cb failed:%d\n", ret);
1026 EXPORT_SYMBOL(sdw_bus_prep_clk_stop);
1029 * sdw_bus_clk_stop: stop bus clock
1031 * @bus: SDW bus instance
1033 * After preparing the Slaves for clock stop, stop the clock by broadcasting
1034 * write to SCP_CTRL register.
1036 int sdw_bus_clk_stop(struct sdw_bus *bus)
1041 * broadcast clock stop now, attached Slaves will ACK this,
1042 * unattached will ignore
1044 ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
1045 SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
1047 if (ret != -ENODATA)
1048 dev_err(bus->dev, "ClockStopNow Broadcast msg failed %d\n", ret);
1054 EXPORT_SYMBOL(sdw_bus_clk_stop);
1057 * sdw_bus_exit_clk_stop: Exit clock stop mode
1059 * @bus: SDW bus instance
1061 * This De-prepares the Slaves by exiting Clock Stop Mode 0. For the Slaves
1062 * exiting Clock Stop Mode 1, they will be de-prepared after they enumerate
1065 int sdw_bus_exit_clk_stop(struct sdw_bus *bus)
1067 bool simple_clk_stop = true;
1068 struct sdw_slave *slave;
1069 bool is_slave = false;
1073 * In order to save on transition time, de-prepare
1074 * each Slave and then wait for all Slave(s) to be
1075 * de-prepared after clock resume.
1077 list_for_each_entry(slave, &bus->slaves, node) {
1078 if (!slave->dev_num)
1081 if (slave->status != SDW_SLAVE_ATTACHED &&
1082 slave->status != SDW_SLAVE_ALERT)
1085 /* Identify if Slave(s) are available on Bus */
1088 ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
1089 SDW_CLK_PRE_DEPREPARE);
1091 dev_warn(&slave->dev, "clock stop pre-deprepare cb failed:%d\n", ret);
1093 /* Only de-prepare a Slave device if needed */
1094 if (!slave->prop.simple_clk_stop_capable) {
1095 simple_clk_stop = false;
1097 ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0,
1101 dev_warn(&slave->dev, "clock stop deprepare failed:%d\n", ret);
1105 /* Skip remaining clock stop de-preparation if no Slave is attached */
1110 * Don't wait for all Slaves to be ready if they follow the simple
1113 if (!simple_clk_stop) {
1114 ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);
1116 dev_warn(bus->dev, "clock stop deprepare wait failed:%d\n", ret);
1119 list_for_each_entry(slave, &bus->slaves, node) {
1120 if (!slave->dev_num)
1123 if (slave->status != SDW_SLAVE_ATTACHED &&
1124 slave->status != SDW_SLAVE_ALERT)
1127 ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
1128 SDW_CLK_POST_DEPREPARE);
1130 dev_warn(&slave->dev, "clock stop post-deprepare cb failed:%d\n", ret);
1135 EXPORT_SYMBOL(sdw_bus_exit_clk_stop);
1137 int sdw_configure_dpn_intr(struct sdw_slave *slave,
1138 int port, bool enable, int mask)
1144 if (slave->bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) {
1145 dev_dbg(&slave->dev, "TEST FAIL interrupt %s\n",
1146 enable ? "on" : "off");
1147 mask |= SDW_DPN_INT_TEST_FAIL;
1150 addr = SDW_DPN_INTMASK(port);
1152 /* Set/Clear port ready interrupt mask */
1155 val |= SDW_DPN_INT_PORT_READY;
1158 val &= ~SDW_DPN_INT_PORT_READY;
1161 ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
1163 dev_err(&slave->dev,
1164 "SDW_DPN_INTMASK write failed:%d\n", val);
1169 static int sdw_slave_set_frequency(struct sdw_slave *slave)
1171 u32 mclk_freq = slave->bus->prop.mclk_freq;
1172 u32 curr_freq = slave->bus->params.curr_dr_freq >> 1;
1179 * frequency base and scale registers are required for SDCA
1180 * devices. They may also be used for 1.2+/non-SDCA devices,
1181 * but we will need a DisCo property to cover this case
1183 if (!slave->id.class_id)
1187 dev_err(&slave->dev,
1188 "no bus MCLK, cannot set SDW_SCP_BUS_CLOCK_BASE\n");
1193 * map base frequency using Table 89 of SoundWire 1.2 spec.
1194 * The order of the tests just follows the specification, this
1195 * is not a selection between possible values or a search for
1196 * the best value but just a mapping. Only one case per platform
1198 * Some BIOS have inconsistent values for mclk_freq but a
1199 * correct root so we force the mclk_freq to avoid variations.
1201 if (!(19200000 % mclk_freq)) {
1202 mclk_freq = 19200000;
1203 base = SDW_SCP_BASE_CLOCK_19200000_HZ;
1204 } else if (!(24000000 % mclk_freq)) {
1205 mclk_freq = 24000000;
1206 base = SDW_SCP_BASE_CLOCK_24000000_HZ;
1207 } else if (!(24576000 % mclk_freq)) {
1208 mclk_freq = 24576000;
1209 base = SDW_SCP_BASE_CLOCK_24576000_HZ;
1210 } else if (!(22579200 % mclk_freq)) {
1211 mclk_freq = 22579200;
1212 base = SDW_SCP_BASE_CLOCK_22579200_HZ;
1213 } else if (!(32000000 % mclk_freq)) {
1214 mclk_freq = 32000000;
1215 base = SDW_SCP_BASE_CLOCK_32000000_HZ;
1217 dev_err(&slave->dev,
1218 "Unsupported clock base, mclk %d\n",
1223 if (mclk_freq % curr_freq) {
1224 dev_err(&slave->dev,
1225 "mclk %d is not multiple of bus curr_freq %d\n",
1226 mclk_freq, curr_freq);
1230 scale = mclk_freq / curr_freq;
1233 * map scale to Table 90 of SoundWire 1.2 spec - and check
1234 * that the scale is a power of two and maximum 64
1236 scale_index = ilog2(scale);
1238 if (BIT(scale_index) != scale || scale_index > 6) {
1239 dev_err(&slave->dev,
1240 "No match found for scale %d, bus mclk %d curr_freq %d\n",
1241 scale, mclk_freq, curr_freq);
1246 ret = sdw_write_no_pm(slave, SDW_SCP_BUS_CLOCK_BASE, base);
1248 dev_err(&slave->dev,
1249 "SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret);
1253 /* initialize scale for both banks */
1254 ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
1256 dev_err(&slave->dev,
1257 "SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret);
1260 ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
1262 dev_err(&slave->dev,
1263 "SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret);
1265 dev_dbg(&slave->dev,
1266 "Configured bus base %d, scale %d, mclk %d, curr_freq %d\n",
1267 base, scale_index, mclk_freq, curr_freq);
1272 static int sdw_initialize_slave(struct sdw_slave *slave)
1274 struct sdw_slave_prop *prop = &slave->prop;
1279 ret = sdw_slave_set_frequency(slave);
1283 if (slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH) {
1284 /* Clear bus clash interrupt before enabling interrupt mask */
1285 status = sdw_read_no_pm(slave, SDW_SCP_INT1);
1287 dev_err(&slave->dev,
1288 "SDW_SCP_INT1 (BUS_CLASH) read failed:%d\n", status);
1291 if (status & SDW_SCP_INT1_BUS_CLASH) {
1292 dev_warn(&slave->dev, "Bus clash detected before INT mask is enabled\n");
1293 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH);
1295 dev_err(&slave->dev,
1296 "SDW_SCP_INT1 (BUS_CLASH) write failed:%d\n", ret);
1301 if ((slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY) &&
1302 !(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY)) {
1303 /* Clear parity interrupt before enabling interrupt mask */
1304 status = sdw_read_no_pm(slave, SDW_SCP_INT1);
1306 dev_err(&slave->dev,
1307 "SDW_SCP_INT1 (PARITY) read failed:%d\n", status);
1310 if (status & SDW_SCP_INT1_PARITY) {
1311 dev_warn(&slave->dev, "PARITY error detected before INT mask is enabled\n");
1312 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_PARITY);
1314 dev_err(&slave->dev,
1315 "SDW_SCP_INT1 (PARITY) write failed:%d\n", ret);
1322 * Set SCP_INT1_MASK register, typically bus clash and
1323 * implementation-defined interrupt mask. The Parity detection
1324 * may not always be correct on startup so its use is
1325 * device-dependent, it might e.g. only be enabled in
1326 * steady-state after a couple of frames.
1328 val = slave->prop.scp_int1_mask;
1330 /* Enable SCP interrupts */
1331 ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val);
1333 dev_err(&slave->dev,
1334 "SDW_SCP_INTMASK1 write failed:%d\n", ret);
1338 /* No need to continue if DP0 is not present */
1339 if (!slave->prop.dp0_prop)
1342 /* Enable DP0 interrupts */
1343 val = prop->dp0_prop->imp_def_interrupts;
1344 val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
1346 ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val);
1348 dev_err(&slave->dev,
1349 "SDW_DP0_INTMASK read failed:%d\n", ret);
1353 static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
1355 u8 clear, impl_int_mask;
1356 int status, status2, ret, count = 0;
1358 status = sdw_read_no_pm(slave, SDW_DP0_INT);
1360 dev_err(&slave->dev,
1361 "SDW_DP0_INT read failed:%d\n", status);
1366 clear = status & ~SDW_DP0_INTERRUPTS;
1368 if (status & SDW_DP0_INT_TEST_FAIL) {
1369 dev_err(&slave->dev, "Test fail for port 0\n");
1370 clear |= SDW_DP0_INT_TEST_FAIL;
1374 * Assumption: PORT_READY interrupt will be received only for
1375 * ports implementing Channel Prepare state machine (CP_SM)
1378 if (status & SDW_DP0_INT_PORT_READY) {
1379 complete(&slave->port_ready[0]);
1380 clear |= SDW_DP0_INT_PORT_READY;
1383 if (status & SDW_DP0_INT_BRA_FAILURE) {
1384 dev_err(&slave->dev, "BRA failed\n");
1385 clear |= SDW_DP0_INT_BRA_FAILURE;
1388 impl_int_mask = SDW_DP0_INT_IMPDEF1 |
1389 SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
1391 if (status & impl_int_mask) {
1392 clear |= impl_int_mask;
1393 *slave_status = clear;
1396 /* clear the interrupts but don't touch reserved and SDCA_CASCADE fields */
1397 ret = sdw_write_no_pm(slave, SDW_DP0_INT, clear);
1399 dev_err(&slave->dev,
1400 "SDW_DP0_INT write failed:%d\n", ret);
1404 /* Read DP0 interrupt again */
1405 status2 = sdw_read_no_pm(slave, SDW_DP0_INT);
1407 dev_err(&slave->dev,
1408 "SDW_DP0_INT read failed:%d\n", status2);
1411 /* filter to limit loop to interrupts identified in the first status read */
1416 /* we can get alerts while processing so keep retrying */
1417 } while ((status & SDW_DP0_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
1419 if (count == SDW_READ_INTR_CLEAR_RETRY)
1420 dev_warn(&slave->dev, "Reached MAX_RETRY on DP0 read\n");
1425 static int sdw_handle_port_interrupt(struct sdw_slave *slave,
1426 int port, u8 *slave_status)
1428 u8 clear, impl_int_mask;
1429 int status, status2, ret, count = 0;
1433 return sdw_handle_dp0_interrupt(slave, slave_status);
1435 addr = SDW_DPN_INT(port);
1436 status = sdw_read_no_pm(slave, addr);
1438 dev_err(&slave->dev,
1439 "SDW_DPN_INT read failed:%d\n", status);
1445 clear = status & ~SDW_DPN_INTERRUPTS;
1447 if (status & SDW_DPN_INT_TEST_FAIL) {
1448 dev_err(&slave->dev, "Test fail for port:%d\n", port);
1449 clear |= SDW_DPN_INT_TEST_FAIL;
1453 * Assumption: PORT_READY interrupt will be received only
1454 * for ports implementing CP_SM.
1456 if (status & SDW_DPN_INT_PORT_READY) {
1457 complete(&slave->port_ready[port]);
1458 clear |= SDW_DPN_INT_PORT_READY;
1461 impl_int_mask = SDW_DPN_INT_IMPDEF1 |
1462 SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
1464 if (status & impl_int_mask) {
1465 clear |= impl_int_mask;
1466 *slave_status = clear;
1469 /* clear the interrupt but don't touch reserved fields */
1470 ret = sdw_write_no_pm(slave, addr, clear);
1472 dev_err(&slave->dev,
1473 "SDW_DPN_INT write failed:%d\n", ret);
1477 /* Read DPN interrupt again */
1478 status2 = sdw_read_no_pm(slave, addr);
1480 dev_err(&slave->dev,
1481 "SDW_DPN_INT read failed:%d\n", status2);
1484 /* filter to limit loop to interrupts identified in the first status read */
1489 /* we can get alerts while processing so keep retrying */
1490 } while ((status & SDW_DPN_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
1492 if (count == SDW_READ_INTR_CLEAR_RETRY)
1493 dev_warn(&slave->dev, "Reached MAX_RETRY on port read");
1498 static int sdw_handle_slave_alerts(struct sdw_slave *slave)
1500 struct sdw_slave_intr_status slave_intr;
1501 u8 clear = 0, bit, port_status[15] = {0};
1502 int port_num, stat, ret, count = 0;
1505 u8 sdca_cascade = 0;
1506 u8 buf, buf2[2], _buf, _buf2[2];
1510 sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
1512 ret = pm_runtime_resume_and_get(&slave->dev);
1513 if (ret < 0 && ret != -EACCES) {
1514 dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
1518 /* Read Intstat 1, Intstat 2 and Intstat 3 registers */
1519 ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
1521 dev_err(&slave->dev,
1522 "SDW_SCP_INT1 read failed:%d\n", ret);
1527 ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, buf2);
1529 dev_err(&slave->dev,
1530 "SDW_SCP_INT2/3 read failed:%d\n", ret);
1534 if (slave->prop.is_sdca) {
1535 ret = sdw_read_no_pm(slave, SDW_DP0_INT);
1537 dev_err(&slave->dev,
1538 "SDW_DP0_INT read failed:%d\n", ret);
1541 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
1545 slave_notify = false;
1548 * Check parity, bus clash and Slave (impl defined)
1551 if (buf & SDW_SCP_INT1_PARITY) {
1552 parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY;
1553 parity_quirk = !slave->first_interrupt_done &&
1554 (slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY);
1556 if (parity_check && !parity_quirk)
1557 dev_err(&slave->dev, "Parity error detected\n");
1558 clear |= SDW_SCP_INT1_PARITY;
1561 if (buf & SDW_SCP_INT1_BUS_CLASH) {
1562 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH)
1563 dev_err(&slave->dev, "Bus clash detected\n");
1564 clear |= SDW_SCP_INT1_BUS_CLASH;
1568 * When bus clash or parity errors are detected, such errors
1569 * are unlikely to be recoverable errors.
1570 * TODO: In such scenario, reset bus. Make this configurable
1571 * via sysfs property with bus reset being the default.
1574 if (buf & SDW_SCP_INT1_IMPL_DEF) {
1575 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) {
1576 dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
1577 slave_notify = true;
1579 clear |= SDW_SCP_INT1_IMPL_DEF;
1582 /* the SDCA interrupts are cleared in the codec driver .interrupt_callback() */
1584 slave_notify = true;
1586 /* Check port 0 - 3 interrupts */
1587 port = buf & SDW_SCP_INT1_PORT0_3;
1589 /* To get port number corresponding to bits, shift it */
1590 port = FIELD_GET(SDW_SCP_INT1_PORT0_3, port);
1591 for_each_set_bit(bit, &port, 8) {
1592 sdw_handle_port_interrupt(slave, bit,
1596 /* Check if cascade 2 interrupt is present */
1597 if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
1598 port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
1599 for_each_set_bit(bit, &port, 8) {
1600 /* scp2 ports start from 4 */
1602 sdw_handle_port_interrupt(slave,
1604 &port_status[port_num]);
1608 /* now check last cascade */
1609 if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
1610 port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
1611 for_each_set_bit(bit, &port, 8) {
1612 /* scp3 ports start from 11 */
1613 port_num = bit + 10;
1614 sdw_handle_port_interrupt(slave,
1616 &port_status[port_num]);
1620 /* Update the Slave driver */
1622 mutex_lock(&slave->sdw_dev_lock);
1624 if (slave->probed) {
1625 struct device *dev = &slave->dev;
1626 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
1628 if (drv->ops && drv->ops->interrupt_callback) {
1629 slave_intr.sdca_cascade = sdca_cascade;
1630 slave_intr.control_port = clear;
1631 memcpy(slave_intr.port, &port_status,
1632 sizeof(slave_intr.port));
1634 drv->ops->interrupt_callback(slave, &slave_intr);
1638 mutex_unlock(&slave->sdw_dev_lock);
1642 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, clear);
1644 dev_err(&slave->dev,
1645 "SDW_SCP_INT1 write failed:%d\n", ret);
1649 /* at this point all initial interrupt sources were handled */
1650 slave->first_interrupt_done = true;
1653 * Read status again to ensure no new interrupts arrived
1654 * while servicing interrupts.
1656 ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
1658 dev_err(&slave->dev,
1659 "SDW_SCP_INT1 recheck read failed:%d\n", ret);
1664 ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, _buf2);
1666 dev_err(&slave->dev,
1667 "SDW_SCP_INT2/3 recheck read failed:%d\n", ret);
1671 if (slave->prop.is_sdca) {
1672 ret = sdw_read_no_pm(slave, SDW_DP0_INT);
1674 dev_err(&slave->dev,
1675 "SDW_DP0_INT recheck read failed:%d\n", ret);
1678 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
1682 * Make sure no interrupts are pending, but filter to limit loop
1683 * to interrupts identified in the first status read
1686 buf2[0] &= _buf2[0];
1687 buf2[1] &= _buf2[1];
1688 stat = buf || buf2[0] || buf2[1] || sdca_cascade;
1691 * Exit loop if Slave is continuously in ALERT state even
1692 * after servicing the interrupt multiple times.
1696 /* we can get alerts while processing so keep retrying */
1697 } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
1699 if (count == SDW_READ_INTR_CLEAR_RETRY)
1700 dev_warn(&slave->dev, "Reached MAX_RETRY on alert read\n");
1703 pm_runtime_mark_last_busy(&slave->dev);
1704 pm_runtime_put_autosuspend(&slave->dev);
1709 static int sdw_update_slave_status(struct sdw_slave *slave,
1710 enum sdw_slave_status status)
1714 mutex_lock(&slave->sdw_dev_lock);
1716 if (slave->probed) {
1717 struct device *dev = &slave->dev;
1718 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
1720 if (drv->ops && drv->ops->update_status)
1721 ret = drv->ops->update_status(slave, status);
1724 mutex_unlock(&slave->sdw_dev_lock);
1730 * sdw_handle_slave_status() - Handle Slave status
1731 * @bus: SDW bus instance
1732 * @status: Status for all Slave(s)
1734 int sdw_handle_slave_status(struct sdw_bus *bus,
1735 enum sdw_slave_status status[])
1737 enum sdw_slave_status prev_status;
1738 struct sdw_slave *slave;
1739 bool attached_initializing;
1742 /* first check if any Slaves fell off the bus */
1743 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1744 mutex_lock(&bus->bus_lock);
1745 if (test_bit(i, bus->assigned) == false) {
1746 mutex_unlock(&bus->bus_lock);
1749 mutex_unlock(&bus->bus_lock);
1751 slave = sdw_get_slave(bus, i);
1755 if (status[i] == SDW_SLAVE_UNATTACHED &&
1756 slave->status != SDW_SLAVE_UNATTACHED) {
1757 dev_warn(&slave->dev, "Slave %d state check1: UNATTACHED, status was %d\n",
1759 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1763 if (status[0] == SDW_SLAVE_ATTACHED) {
1764 dev_dbg(bus->dev, "Slave attached, programming device number\n");
1765 ret = sdw_program_device_num(bus);
1767 dev_err(bus->dev, "Slave attach failed: %d\n", ret);
1769 * programming a device number will have side effects,
1770 * so we deal with other devices at a later time
1775 /* Continue to check other slave statuses */
1776 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1777 mutex_lock(&bus->bus_lock);
1778 if (test_bit(i, bus->assigned) == false) {
1779 mutex_unlock(&bus->bus_lock);
1782 mutex_unlock(&bus->bus_lock);
1784 slave = sdw_get_slave(bus, i);
1788 attached_initializing = false;
1790 switch (status[i]) {
1791 case SDW_SLAVE_UNATTACHED:
1792 if (slave->status == SDW_SLAVE_UNATTACHED)
1795 dev_warn(&slave->dev, "Slave %d state check2: UNATTACHED, status was %d\n",
1798 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1801 case SDW_SLAVE_ALERT:
1802 ret = sdw_handle_slave_alerts(slave);
1804 dev_err(&slave->dev,
1805 "Slave %d alert handling failed: %d\n",
1809 case SDW_SLAVE_ATTACHED:
1810 if (slave->status == SDW_SLAVE_ATTACHED)
1813 prev_status = slave->status;
1814 sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
1816 if (prev_status == SDW_SLAVE_ALERT)
1819 attached_initializing = true;
1821 ret = sdw_initialize_slave(slave);
1823 dev_err(&slave->dev,
1824 "Slave %d initialization failed: %d\n",
1830 dev_err(&slave->dev, "Invalid slave %d status:%d\n",
1835 ret = sdw_update_slave_status(slave, status[i]);
1837 dev_err(&slave->dev,
1838 "Update Slave status failed:%d\n", ret);
1839 if (attached_initializing) {
1840 dev_dbg(&slave->dev,
1841 "%s: signaling initialization completion for Slave %d\n",
1842 __func__, slave->dev_num);
1844 complete(&slave->initialization_complete);
1847 * If the manager became pm_runtime active, the peripherals will be
1848 * restarted and attach, but their pm_runtime status may remain
1849 * suspended. If the 'update_slave_status' callback initiates
1850 * any sort of deferred processing, this processing would not be
1851 * cancelled on pm_runtime suspend.
1852 * To avoid such zombie states, we queue a request to resume.
1853 * This would be a no-op in case the peripheral was being resumed
1854 * by e.g. the ALSA/ASoC framework.
1856 pm_request_resume(&slave->dev);
1862 EXPORT_SYMBOL(sdw_handle_slave_status);
1864 void sdw_clear_slave_status(struct sdw_bus *bus, u32 request)
1866 struct sdw_slave *slave;
1869 /* Check all non-zero devices */
1870 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1871 mutex_lock(&bus->bus_lock);
1872 if (test_bit(i, bus->assigned) == false) {
1873 mutex_unlock(&bus->bus_lock);
1876 mutex_unlock(&bus->bus_lock);
1878 slave = sdw_get_slave(bus, i);
1882 if (slave->status != SDW_SLAVE_UNATTACHED) {
1883 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1884 slave->first_interrupt_done = false;
1885 sdw_update_slave_status(slave, SDW_SLAVE_UNATTACHED);
1888 /* keep track of request, used in pm_runtime resume */
1889 slave->unattach_request = request;
1892 EXPORT_SYMBOL(sdw_clear_slave_status);