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/kernel/linux/linux-6.6/Documentation/devicetree/bindings/i2c/
Di2c-arb-gpio-challenge.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-arb-gpio-challenge.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
10 - Doug Anderson <dianders@chromium.org>
11 - Peter Rosin <peda@axentia.se>
18 standard I2C multi-master rules. Using GPIOs is generally useful in the case
30 others can see. These are all active low with pull-ups enabled. We'll
32 * OUR_CLAIM: output from us signaling to other hosts that we want the bus
[all …]
/kernel/linux/linux-5.10/Documentation/devicetree/bindings/i2c/
Di2c-arb-gpio-challenge.txt1 GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
7 the standard I2C multi-master rules. Using GPIOs is generally useful in
21 others can see. These are all active low with pull-ups enabled. We'll
24 - OUR_CLAIM: output from us signaling to other hosts that we want the bus
25 - THEIR_CLAIMS: output from others signaling that they want the bus
37 4. Otherwise, wait for a few milliseconds and see if THEIR_CLAIMS are released.
38 5. If not, back off, release the claim and wait for a few more milliseconds.
39 6. Go back to 1 (until retry time has expired).
43 - compatible: i2c-arb-gpio-challenge
44 - our-claim-gpio: The GPIO that we use to claim the bus.
[all …]
/kernel/linux/linux-6.6/drivers/mtd/chips/
Dcfi_cmdset_0020.c1 // SPDX-License-Identifier: GPL-2.0
9 * - completely revamped method functions so they are aware and
11 * - scalability vs code size is completely set at compile-time
13 * - optimized write buffer method
14 * 06/21/2002 Joern Engel <joern@wh.fh-wedel.de> and others
15 * - modified Intel Command Set 0x0001 to support ST Advanced Architecture
17 * - added a writev function
18 * 07/13/2005 Joern Engel <joern@wh.fh-wedel.de>
19 * - Plugged memory leak in cfi_staa_writev().
69 printk(" Feature/Command Support: %4.4X\n", extp->FeatureSupport); in cfi_tell_features()
[all …]
/kernel/linux/linux-5.10/drivers/mtd/chips/
Dcfi_cmdset_0020.c8 * - completely revamped method functions so they are aware and
10 * - scalability vs code size is completely set at compile-time
12 * - optimized write buffer method
13 * 06/21/2002 Joern Engel <joern@wh.fh-wedel.de> and others
14 * - modified Intel Command Set 0x0001 to support ST Advanced Architecture
16 * - added a writev function
17 * 07/13/2005 Joern Engel <joern@wh.fh-wedel.de>
18 * - Plugged memory leak in cfi_staa_writev().
68 printk(" Feature/Command Support: %4.4X\n", extp->FeatureSupport); in cfi_tell_features()
69 printk(" - Chip Erase: %s\n", extp->FeatureSupport&1?"supported":"unsupported"); in cfi_tell_features()
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/kernel/linux/linux-6.6/Documentation/locking/
Dww-mutex-design.rst2 Wound/Wait Deadlock-Proof Mutex Design
5 Please read mutex-design.rst first, as it applies to wait/wound mutexes too.
7 Motivation for WW-Mutexes
8 -------------------------
14 a handful of situations where the driver needs to wait for buffers to
37 and the deadlock handling approach is called Wait-Die. The name is based on
41 and dies. Hence Wait-Die.
42 There is also another algorithm called Wound-Wait:
46 transaction. Hence Wound-Wait.
48 However, the Wound-Wait algorithm is typically stated to generate fewer backoffs
[all …]
/kernel/linux/linux-5.10/Documentation/locking/
Dww-mutex-design.rst2 Wound/Wait Deadlock-Proof Mutex Design
5 Please read mutex-design.txt first, as it applies to wait/wound mutexes too.
7 Motivation for WW-Mutexes
8 -------------------------
14 a handful of situations where the driver needs to wait for buffers to
37 and the deadlock handling approach is called Wait-Die. The name is based on
41 and dies. Hence Wait-Die.
42 There is also another algorithm called Wound-Wait:
46 transaction. Hence Wound-Wait.
48 However, the Wound-Wait algorithm is typically stated to generate fewer backoffs
[all …]
/kernel/linux/linux-6.6/drivers/i2c/muxes/
Di2c-arb-gpio-challenge.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
12 #include <linux/i2c-mux.h>
19 * struct i2c_arbitrator_data - Driver data for I2C arbitrator
23 * @slew_delay_us: microseconds to wait for a GPIO to go high.
38 * i2c_arbitrator_select - claim the I2C bus
40 * Use the GPIO-based signalling protocol; return -EBUSY if we fail.
48 stop_time = jiffies + usecs_to_jiffies(arb->wait_free_us) + 1; in i2c_arbitrator_select()
51 gpiod_set_value(arb->our_gpio, 1); in i2c_arbitrator_select()
52 udelay(arb->slew_delay_us); in i2c_arbitrator_select()
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/kernel/linux/linux-5.10/drivers/i2c/muxes/
Di2c-arb-gpio-challenge.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
12 #include <linux/i2c-mux.h>
19 * struct i2c_arbitrator_data - Driver data for I2C arbitrator
23 * @slew_delay_us: microseconds to wait for a GPIO to go high.
38 * i2c_arbitrator_select - claim the I2C bus
40 * Use the GPIO-based signalling protocol; return -EBUSY if we fail.
48 stop_time = jiffies + usecs_to_jiffies(arb->wait_free_us) + 1; in i2c_arbitrator_select()
51 gpiod_set_value(arb->our_gpio, 1); in i2c_arbitrator_select()
52 udelay(arb->slew_delay_us); in i2c_arbitrator_select()
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/kernel/linux/linux-5.10/drivers/gpu/drm/i915/gem/
Di915_gem_busy.c2 * SPDX-License-Identifier: MIT
4 * Copyright © 2014-2016 Intel Corporation
29 * last_read - hence we always set both read and write busy for in __busy_write_id()
46 * to eventually flush us, but to minimise latency just ask the in __busy_set_if_active()
59 /* Beware type-expansion follies! */ in __busy_set_if_active()
60 BUILD_BUG_ON(!typecheck(u16, rq->engine->uabi_class)); in __busy_set_if_active()
61 return flag(rq->engine->uabi_class); in __busy_set_if_active()
89 err = -ENOENT; in i915_gem_busy_ioctl()
91 obj = i915_gem_object_lookup_rcu(file, args->handle); in i915_gem_busy_ioctl()
97 * non-i915 fences, i.e. even though we may report the object as idle, in i915_gem_busy_ioctl()
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/kernel/linux/linux-6.6/drivers/gpu/drm/i915/display/
Dintel_fdi.c1 // SPDX-License-Identifier: MIT
32 * so pipe->transcoder cast is fine here. in assert_fdi_tx()
117 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); in intel_fdi_link_train()
119 dev_priv->display.funcs.fdi->fdi_link_train(crtc, crtc_state); in intel_fdi_link_train()
125 if (crtc_state->hw.enable && crtc_state->has_pch_encoder) in pipe_required_fdi_lanes()
126 return crtc_state->fdi_lanes; in pipe_required_fdi_lanes()
135 struct drm_atomic_state *state = pipe_config->uapi.state; in ilk_check_fdi_lanes()
139 drm_dbg_kms(&dev_priv->drm, in ilk_check_fdi_lanes()
141 pipe_name(pipe), pipe_config->fdi_lanes); in ilk_check_fdi_lanes()
142 if (pipe_config->fdi_lanes > 4) { in ilk_check_fdi_lanes()
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/kernel/linux/linux-5.10/drivers/usb/storage/
Dtransport.c1 // SPDX-License-Identifier: GPL-2.0+
6 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
9 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
20 * similar to commands in the SCSI-II and ATAPI specifications.
23 * exhibits class-specific exemptions from the USB specification.
25 * that they are used to communicate wait, failed and OK on commands.
58 * ---------------------------------
61 * only to transactions resulting from a scsi queued-command, since only
63 * as those occurring during device-specific initialization, must be handled
67 * sets the machine state and the ABORTING bit in us->dflags to prevent
[all …]
/kernel/linux/linux-6.6/drivers/usb/storage/
Dtransport.c1 // SPDX-License-Identifier: GPL-2.0+
6 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
9 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
20 * similar to commands in the SCSI-II and ATAPI specifications.
23 * exhibits class-specific exemptions from the USB specification.
25 * that they are used to communicate wait, failed and OK on commands.
58 * ---------------------------------
61 * only to transactions resulting from a scsi queued-command, since only
63 * as those occurring during device-specific initialization, must be handled
67 * sets the machine state and the ABORTING bit in us->dflags to prevent
[all …]
/kernel/linux/linux-6.6/drivers/gpu/drm/amd/display/dc/dce/
Ddmub_replay.c41 struct dmub_srv *srv = dmub->ctx->dmub_srv->dmub; in dmub_replay_get_state()
47 // Send gpint command and wait for ack in dmub_replay_get_state()
58 // Assert if max retry hit in dmub_replay_get_state()
61 /* To-do: Add retry fail log */ in dmub_replay_get_state()
68 static void dmub_replay_enable(struct dmub_replay *dmub, bool enable, bool wait, uint8_t panel_inst) in dmub_replay_enable() argument
71 struct dc_context *dc = dmub->ctx; in dmub_replay_enable()
89 /* Below loops 1000 x 500us = 500 ms. in dmub_replay_enable()
90 * Exit REPLAY may need to wait 1-2 frames to power up. Timeout after at in dmub_replay_enable()
91 * least a few frames. Should never hit the max retry assert below. in dmub_replay_enable()
93 if (wait) { in dmub_replay_enable()
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/kernel/linux/linux-6.6/kernel/futex/
Dpi.c1 // SPDX-License-Identifier: GPL-2.0-or-later
16 if (likely(current->pi_state_cache)) in refill_pi_state_cache()
22 return -ENOMEM; in refill_pi_state_cache()
24 INIT_LIST_HEAD(&pi_state->list); in refill_pi_state_cache()
26 pi_state->owner = NULL; in refill_pi_state_cache()
27 refcount_set(&pi_state->refcount, 1); in refill_pi_state_cache()
28 pi_state->key = FUTEX_KEY_INIT; in refill_pi_state_cache()
30 current->pi_state_cache = pi_state; in refill_pi_state_cache()
37 struct futex_pi_state *pi_state = current->pi_state_cache; in alloc_pi_state()
40 current->pi_state_cache = NULL; in alloc_pi_state()
[all …]
Dwaitwake.c1 // SPDX-License-Identifier: GPL-2.0-or-later
35 * sys_futex(WAIT, futex, val);
49 * This would cause the waiter on CPU 0 to wait forever because it
59 * sys_futex(WAIT, futex, val);
63 * smp_mb(); (A) <-- paired with -.
72 * `--------> smp_mb(); (B)
79 * waiters--; (b) unlock(hash_bucket(futex));
98 * the wait call can return error, in which case we backtrack from it in (b).
103 * acquiring the lock. It then decrements them again after releasing it -
117 struct task_struct *p = q->task; in futex_wake_mark()
[all …]
/kernel/linux/linux-5.10/kernel/futex/
Dcore.c1 // SPDX-License-Identifier: GPL-2.0-or-later
16 * PI-futex support started by Ingo Molnar and Thomas Gleixner
23 * Requeue-PI support by Darren Hart <dvhltc@us.ibm.com>
29 * Kirkwood for proof-of-concept implementation.
40 #include <linux/fault-inject.h>
73 * sys_futex(WAIT, futex, val);
87 * This would cause the waiter on CPU 0 to wait forever because it
97 * sys_futex(WAIT, futex, val);
101 * smp_mb(); (A) <-- paired with -.
110 * `--------> smp_mb(); (B)
[all …]
/kernel/linux/linux-6.6/sound/soc/au1x/
Dac97c.c1 // SPDX-License-Identifier: GPL-2.0-only
8 * Charles Eidsness <charles@cooper-street.com>
23 #include <asm/mach-au1x00/au1000.h>
57 /* how often to retry failed codec register reads/writes */
74 return __raw_readl(ctx->mmio + reg); in RD()
79 __raw_writel(v, ctx->mmio + reg); in WR()
87 unsigned int tmo, retry; in au1xac97c_ac97_read() local
91 retry = AC97_RW_RETRIES; in au1xac97c_ac97_read()
93 mutex_lock(&ctx->lock); in au1xac97c_ac97_read()
96 while ((RD(ctx, AC97_STATUS) & STAT_CP) && --tmo) in au1xac97c_ac97_read()
[all …]
/kernel/linux/linux-5.10/sound/soc/au1x/
Dac97c.c1 // SPDX-License-Identifier: GPL-2.0-only
8 * Charles Eidsness <charles@cooper-street.com>
23 #include <asm/mach-au1x00/au1000.h>
57 /* how often to retry failed codec register reads/writes */
74 return __raw_readl(ctx->mmio + reg); in RD()
79 __raw_writel(v, ctx->mmio + reg); in WR()
87 unsigned int tmo, retry; in au1xac97c_ac97_read() local
91 retry = AC97_RW_RETRIES; in au1xac97c_ac97_read()
93 mutex_lock(&ctx->lock); in au1xac97c_ac97_read()
96 while ((RD(ctx, AC97_STATUS) & STAT_CP) && --tmo) in au1xac97c_ac97_read()
[all …]
/kernel/linux/linux-6.6/drivers/infiniband/hw/hfi1/
Dfirmware.c1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
3 * Copyright(c) 2015 - 2017 Intel Corporation.
103 #define AUGMENT_SIZE (sizeof(struct augmented_firmware_file) - \
161 /* 8051 memory access timeout, in us */
162 #define DC8051_ACCESS_TIMEOUT 100 /* us */
217 * Read a single 64-bit value from 8051 data memory.
224 * ignored - i.e. the hardware will always do aligned 8-byte reads as if
227 * Return 0 on success, -ENXIO on a read error (timeout).
242 /* wait until ACCESS_COMPLETED is set */ in __read_8051_data()
250 return -ENXIO; in __read_8051_data()
[all …]
/kernel/linux/linux-6.6/drivers/scsi/bfa/
Dbfa_defs_fcs.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
4 * Copyright (c) 2014- QLogic Corporation.
8 * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
73 * - FCP IM and FCP TM roles cannot be enabled together for a FCS port
74 * - Create multiple ports if both IM and TM functions required.
75 * - Atleast one role must be specified.
228 u32 rport_plogi_timeouts; /* Rport plogi retry timeout count */
230 * (max retry of plogi) */
276 * TODO - remove
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/kernel/linux/linux-5.10/drivers/scsi/bfa/
Dbfa_defs_fcs.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
4 * Copyright (c) 2014- QLogic Corporation.
8 * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
73 * - FCP IM and FCP TM roles cannot be enabled together for a FCS port
74 * - Create multiple ports if both IM and TM functions required.
75 * - Atleast one role must be specified.
228 u32 rport_plogi_timeouts; /* Rport plogi retry timeout count */
230 * (max retry of plogi) */
276 * TODO - remove
[all …]
/kernel/linux/linux-5.10/drivers/infiniband/hw/hfi1/
Dfirmware.c2 * Copyright(c) 2015 - 2017 Intel Corporation.
24 * - Redistributions of source code must retain the above copyright
26 * - Redistributions in binary form must reproduce the above copyright
30 * - Neither the name of Intel Corporation nor the names of its
146 #define AUGMENT_SIZE (sizeof(struct augmented_firmware_file) - \
204 /* 8051 memory access timeout, in us */
205 #define DC8051_ACCESS_TIMEOUT 100 /* us */
260 * Read a single 64-bit value from 8051 data memory.
267 * ignored - i.e. the hardware will always do aligned 8-byte reads as if
270 * Return 0 on success, -ENXIO on a read error (timeout).
[all …]
/kernel/linux/linux-6.6/drivers/gpu/drm/i915/gt/
Dintel_reset.c1 // SPDX-License-Identifier: MIT
3 * Copyright © 2008-2018 Intel Corporation
40 struct drm_i915_file_private *file_priv = ctx->file_priv; in client_mark_guilty()
51 prev_hang = xchg(&file_priv->hang_timestamp, jiffies); in client_mark_guilty()
56 atomic_add(score, &file_priv->ban_score); in client_mark_guilty()
58 drm_dbg(&ctx->i915->drm, in client_mark_guilty()
60 ctx->name, score, in client_mark_guilty()
61 atomic_read(&file_priv->ban_score)); in client_mark_guilty()
72 if (intel_context_is_closed(rq->context)) in mark_guilty()
76 ctx = rcu_dereference(rq->context->gem_context); in mark_guilty()
[all …]
/kernel/linux/linux-6.6/drivers/usb/typec/tcpm/
Dtcpci_rt1711h.c1 // SPDX-License-Identifier: GPL-2.0+
5 * Richtek RT1711H Type-C Chip Driver
65 return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16)); in rt1711h_read16()
70 return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16)); in rt1711h_write16()
75 return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8)); in rt1711h_read8()
80 return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8)); in rt1711h_write8()
98 struct regmap *regmap = chip->data.regmap; in rt1711h_init()
108 if (chip->did == RT1715_DID) { in rt1711h_init()
121 /* tTCPCfilter : (26.7 * val) us */ in rt1711h_init()
136 /* Enable phy discard retry, retry count 7, rx filter deglitch 100 us */ in rt1711h_init()
[all …]
/kernel/linux/linux-6.6/drivers/parport/
Dieee1284_ops.c1 // SPDX-License-Identifier: GPL-2.0
2 /* IEEE-1284 operations for parport.
5 * they are used by the low-level drivers. If they have a special way
7 * the function pointers in port->ops); if not, they can just use these
31 * One-way data transfer functions. *
43 struct pardevice *dev = port->physport->cad; in parport_ieee1284_write_compat()
47 if (port->irq != PARPORT_IRQ_NONE) { in parport_ieee1284_write_compat()
52 port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA; in parport_ieee1284_write_compat()
56 unsigned long expire = jiffies + dev->timeout; in parport_ieee1284_write_compat()
57 long wait = msecs_to_jiffies(10); in parport_ieee1284_write_compat() local
[all …]

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