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... if (olddev) { ... i3c_dev_disable_ibi_locked(olddev); ^^^^^^ The olddev should not receive any commands on the i3c bus as it does not exist and has been assigned a new address. This will result in NACK or timeout. So remove it. } } Fixes: 317bacf960a4 ("i3c: master: add enable(disable) hot join in sys entr= y") Signed-off-by: Frank Li --- drivers/i3c/master.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 7028f03c2c42e..852b32178b722 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -2039,10 +2039,8 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_= controller *master, ibireq.max_payload_len =3D olddev->ibi->max_payload_len; ibireq.num_slots =3D olddev->ibi->num_slots; =20 - if (olddev->ibi->enabled) { + if (olddev->ibi->enabled) enable_ibi =3D true; - i3c_dev_disable_ibi_locked(olddev); - } =20 i3c_dev_free_ibi_locked(olddev); } --=20 2.34.1 From nobody Sun Feb 8 13:39:22 2026 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11011037.outbound.protection.outlook.com [52.101.65.37]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10D6B1A0704 for ; 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Improve maintainability and extensibility of the code. Signed-off-by: Frank Li --- drivers/i3c/master.c | 4 ++-- include/linux/i3c/master.h | 4 +++- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 852b32178b722..85c737554c940 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -348,7 +348,7 @@ static enum i3c_addr_slot_status i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr) { unsigned long status; - int bitpos =3D addr * 2; + int bitpos =3D addr * I3C_ADDR_SLOT_BITS; =20 if (addr > I2C_MAX_ADDR) return I3C_ADDR_SLOT_RSVD; @@ -362,7 +362,7 @@ i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 a= ddr) static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, enum i3c_addr_slot_status status) { - int bitpos =3D addr * 2; + int bitpos =3D addr * I3C_ADDR_SLOT_BITS; unsigned long *ptr; =20 if (addr > I2C_MAX_ADDR) diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index 074f632868d98..4601b6957f799 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -299,6 +299,8 @@ enum i3c_addr_slot_status { I3C_ADDR_SLOT_STATUS_MASK =3D 3, }; =20 +#define I3C_ADDR_SLOT_BITS 2 + /** * struct i3c_bus - I3C bus object * @cur_master: I3C master currently driving the bus. 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This is generally set by the 'assigned-address' in the device tree source (dts) file. When an i3c device is removed from the bus, the old address status is set to FREE, allowing other devices to use the address during hotjoin. The I3C_ADDR_SLOT_EXT_INIT status indicates that an address is preferred by some devices. The function i3c_bus_get_free_addr() will first attempt to use unassigned addresses before searching for assigned addresses of devices that have been removed from the bus, trying to best match the 'assigned-address'. Signed-off-by: Frank Li --- drivers/i3c/master.c | 43 ++++++++++++++++++++++++++++++++++--------- include/linux/i3c/master.h | 6 +++++- 2 files changed, 39 insertions(+), 10 deletions(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 85c737554c940..4281f673e08d8 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -345,7 +345,7 @@ const struct bus_type i3c_bus_type =3D { EXPORT_SYMBOL_GPL(i3c_bus_type); =20 static enum i3c_addr_slot_status -i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr) +i3c_bus_get_addr_slot_status_ext(struct i3c_bus *bus, u16 addr) { unsigned long status; int bitpos =3D addr * I3C_ADDR_SLOT_BITS; @@ -356,11 +356,17 @@ i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16= addr) status =3D bus->addrslots[bitpos / BITS_PER_LONG]; status >>=3D bitpos % BITS_PER_LONG; =20 - return status & I3C_ADDR_SLOT_STATUS_MASK; + return status & I3C_ADDR_SLOT_EXT_STATUS_MASK; } =20 -static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, - enum i3c_addr_slot_status status) +static enum i3c_addr_slot_status +i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr) +{ + return i3c_bus_get_addr_slot_status_ext(bus, addr) & I3C_ADDR_SLOT_STATUS= _MASK; +} + +static void i3c_bus_set_addr_slot_status_mask(struct i3c_bus *bus, u16 add= r, + enum i3c_addr_slot_status status, int mask) { int bitpos =3D addr * I3C_ADDR_SLOT_BITS; unsigned long *ptr; @@ -369,11 +375,22 @@ static void i3c_bus_set_addr_slot_status(struct i3c_b= us *bus, u16 addr, return; =20 ptr =3D bus->addrslots + (bitpos / BITS_PER_LONG); - *ptr &=3D ~((unsigned long)I3C_ADDR_SLOT_STATUS_MASK << - (bitpos % BITS_PER_LONG)); + *ptr &=3D ~((unsigned long)mask << (bitpos % BITS_PER_LONG)); *ptr |=3D (unsigned long)status << (bitpos % BITS_PER_LONG); } =20 +static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, + enum i3c_addr_slot_status status) +{ + i3c_bus_set_addr_slot_status_mask(bus, addr, status, I3C_ADDR_SLOT_STATUS= _MASK); +} + +static void i3c_bus_set_addr_slot_status_ext(struct i3c_bus *bus, u16 addr, + enum i3c_addr_slot_status status) +{ + i3c_bus_set_addr_slot_status_mask(bus, addr, status, I3C_ADDR_SLOT_EXT_ST= ATUS_MASK); +} + static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr) { enum i3c_addr_slot_status status; @@ -388,6 +405,14 @@ static int i3c_bus_get_free_addr(struct i3c_bus *bus, = u8 start_addr) enum i3c_addr_slot_status status; u8 addr; =20 + /* try find an address, which have not pre-allocated by assigned-address = */ + for (addr =3D start_addr; addr < I3C_MAX_ADDR; addr++) { + status =3D i3c_bus_get_addr_slot_status_ext(bus, addr); + if (status =3D=3D I3C_ADDR_SLOT_FREE) + return addr; + } + + /* use pre-allocoated by assigned-address because such device was removed= at bus*/ for (addr =3D start_addr; addr < I3C_MAX_ADDR; addr++) { status =3D i3c_bus_get_addr_slot_status(bus, addr); if (status =3D=3D I3C_ADDR_SLOT_FREE) @@ -1906,9 +1931,9 @@ static int i3c_master_bus_init(struct i3c_master_cont= roller *master) goto err_rstdaa; } =20 - i3c_bus_set_addr_slot_status(&master->bus, - i3cboardinfo->init_dyn_addr, - I3C_ADDR_SLOT_I3C_DEV); + i3c_bus_set_addr_slot_status_ext(&master->bus, + i3cboardinfo->init_dyn_addr, + I3C_ADDR_SLOT_I3C_DEV | I3C_ADDR_SLOT_EXT_INIT); =20 /* * Only try to create/attach devices that have a static diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index 4601b6957f799..c923b76bbc321 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -284,6 +284,8 @@ enum i3c_bus_mode { * @I3C_ADDR_SLOT_I2C_DEV: address is assigned to an I2C device * @I3C_ADDR_SLOT_I3C_DEV: address is assigned to an I3C device * @I3C_ADDR_SLOT_STATUS_MASK: address slot mask + * @I3C_ADDR_SLOT_EXT_INIT: the bit mask display of addresses is preferred= by some devices, + * such as the "assigned-address" in device tree source (dts). * * On an I3C bus, addresses are assigned dynamically, and we need to know = which * addresses are free to use and which ones are already assigned. @@ -297,9 +299,11 @@ enum i3c_addr_slot_status { I3C_ADDR_SLOT_I2C_DEV, I3C_ADDR_SLOT_I3C_DEV, I3C_ADDR_SLOT_STATUS_MASK =3D 3, + I3C_ADDR_SLOT_EXT_STATUS_MASK =3D 7, + I3C_ADDR_SLOT_EXT_INIT =3D BIT(2), }; 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Assume a device have assigned-address 0xb. - Device issue Hotjoin - Call i3c_master_do_daa() - Call driver xxx_do_daa() - Call i3c_master_get_free_addr() to get dynamic address 0x9 - i3c_master_add_i3c_dev_locked(0x9) - expected_dyn_addr =3D newdev->boardinfo->init_dyn_addr (0xb); - i3c_master_reattach_i3c_dev(newdev(0xb), old_dyn_addr(0x9)); - if (dev->info.dyn_addr !=3D old_dyn_addr && ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 0xb !=3D 0x9 -> TRUE (!dev->boardinfo || ^^^^^^^^^^^^^^^ -> FALSE dev->info.dyn_addr !=3D dev->boardinfo->init_dyn_addr)) { ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 0xb !=3D 0xb -> FALSE ... i3c_bus_set_addr_slot_status(&master->bus, old_dyn_addr, I3C_ADDR_SLOT_FREE); ^^^ This will be skipped. So old_dyn_addr never free } - i3c_master_get_free_addr() will return increased sequence number. Remove dev->info.dyn_addr !=3D dev->boardinfo->init_dyn_addr condition chec= k. dev->info.dyn_addr should be checked before calling this function because i3c_master_setnewda_locked() has already been called and the target device has already accepted dyn_addr. It is too late to check if dyn_addr is free in i3c_master_reattach_i3c_dev(). Add check to ensure expected_dyn_addr is free before i3c_master_setnewda_locked(). Fixes: cc3a392d69b6 ("i3c: master: fix for SETDASA and DAA process") Cc: stable@kernel.org Signed-off-by: Frank Li --- drivers/i3c/master.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 4281f673e08d8..c8eaeada54781 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -1531,16 +1531,9 @@ static int i3c_master_reattach_i3c_dev(struct i3c_de= v_desc *dev, u8 old_dyn_addr) { struct i3c_master_controller *master =3D i3c_dev_get_master(dev); - enum i3c_addr_slot_status status; int ret; =20 - if (dev->info.dyn_addr !=3D old_dyn_addr && - (!dev->boardinfo || - dev->info.dyn_addr !=3D dev->boardinfo->init_dyn_addr)) { - status =3D i3c_bus_get_addr_slot_status(&master->bus, - dev->info.dyn_addr); - if (status !=3D I3C_ADDR_SLOT_FREE) - return -EBUSY; + if (dev->info.dyn_addr !=3D old_dyn_addr) { i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, I3C_ADDR_SLOT_I3C_DEV); @@ -1931,9 +1924,10 @@ static int i3c_master_bus_init(struct i3c_master_con= troller *master) goto err_rstdaa; } =20 + /* Not mark as occupied until real device exist in bus */ i3c_bus_set_addr_slot_status_ext(&master->bus, i3cboardinfo->init_dyn_addr, - I3C_ADDR_SLOT_I3C_DEV | I3C_ADDR_SLOT_EXT_INIT); + I3C_ADDR_SLOT_EXT_INIT); =20 /* * Only try to create/attach devices that have a static @@ -2094,7 +2088,8 @@ int i3c_master_add_i3c_dev_locked(struct i3c_master_c= ontroller *master, else expected_dyn_addr =3D newdev->info.dyn_addr; =20 - if (newdev->info.dyn_addr !=3D expected_dyn_addr) { + if (newdev->info.dyn_addr !=3D expected_dyn_addr && + i3c_bus_get_addr_slot_status(&master->bus, expected_dyn_addr) =3D=3D = I3C_ADDR_SLOT_FREE) { /* * Try to apply the expected dynamic address. 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Cc: stable@kernel.org Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure") Signed-off-by: Frank Li --- drivers/i3c/master.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index c8eaeada54781..65642e5afdcfb 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -1442,7 +1442,7 @@ static void i3c_master_put_i3c_addrs(struct i3c_dev_d= esc *dev) I3C_ADDR_SLOT_FREE); =20 if (dev->boardinfo && dev->boardinfo->init_dyn_addr) - i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, + i3c_bus_set_addr_slot_status(&master->bus, dev->boardinfo->init_dyn_addr, I3C_ADDR_SLOT_FREE); } =20 --=20 2.34.1 From nobody Sun Feb 8 13:39:22 2026 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11011005.outbound.protection.outlook.com [52.101.65.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AD84D1A0AE0 for ; 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Most of the time, returning -EAGAIN is acceptable, but the case below becomes highly complex. When a Hotjoin event occurs: - i3c_master_do_daa() - i3c_master_add_i3c_dev_locked() - A dynamic address (e.g., 0x9) is already set during DAA. - i3c_master_getpid_locked() - Another device issues HJ or IBI here. Returning -EAGAIN causes failure in adding the new device. However, the dynamic address(0x9) has already been assigned to this device. If another device issues HJ, it will get this address 0x9 again, causing two devices on the bus to use the same dynamic address 0x9. - Attempting to send RSTDAA when the first device fails at i3c_master_getpid_locked() could also fail when sending RSTDAA for the same reason. According to the I3C spec, address arbitration only happens at START, never at REPEAT start. Using repeat start when an IBI WIN occurs simplifies this case, as i3c_master_getpid_locked() will not return an error when another device tries to send HJ or IBI. Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 36 ++++++++++++++++++---------------= --- 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index e80c002991f75..5d19251238ff8 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -1099,6 +1099,24 @@ static int svc_i3c_master_xfer(struct svc_i3c_master= *master, if (ret) goto emit_stop; =20 + /* + * According to I3C spec ver 1.1.1, 5.1.2.2.3 Consequence of Controller = Starting a + * Frame with I3C Target Address. + * + * The I3C Controller normally should start a Frame, the Address may be = arbitrated, + * and so the Controller shall monitor to see whether an In-Band Interru= pt request, + * a Controller Role Request (i.e., Secondary Controller requests to bec= ome the + * Active Controller), or a Hot-Join Request has been made. + * + * If missed IBIWON check, the wrong data will be return. When IBIWON ha= ppen, issue + * repeat start. Address arbitrate only happen at START, never happen at= REPEAT + * start. + */ + if (SVC_I3C_MSTATUS_IBIWON(reg)) { + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + continue; + } + if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) { /* * According to I3C Spec 1.1.1, 11-Jun-2021, section: 5.1.2.2.3. @@ -1132,24 +1150,6 @@ static int svc_i3c_master_xfer(struct svc_i3c_master= *master, } } =20 - /* - * According to I3C spec ver 1.1.1, 5.1.2.2.3 Consequence of Controller S= tarting a Frame - * with I3C Target Address. - * - * The I3C Controller normally should start a Frame, the Address may be a= rbitrated, and so - * the Controller shall monitor to see whether an In-Band Interrupt reque= st, a Controller - * Role Request (i.e., Secondary Controller requests to become the Active= Controller), or - * a Hot-Join Request has been made. - * - * If missed IBIWON check, the wrong data will be return. 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However, manual emission of NACK/ACK is needed for hot join or controller request events. Add help function svc_i3c_master_handle_ibi_won() to check event type and send out NACK if the event is not an IBI. Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index 5d19251238ff8..d665639523e3c 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -405,6 +405,24 @@ static void svc_i3c_master_nack_ibi(struct svc_i3c_mas= ter *master) master->regs + SVC_I3C_MCTRL); } =20 +static int svc_i3c_master_handle_ibi_won(struct svc_i3c_master *master, u3= 2 mstatus) +{ + u32 ibitype; + + ibitype =3D SVC_I3C_MSTATUS_IBITYPE(mstatus); + + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + + /* Hardware can't auto emit NACK for hot join and master request */ + switch (ibitype) { + case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: + case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: + svc_i3c_master_nack_ibi(master); + } + + return 0; +} + static void svc_i3c_master_ibi_work(struct work_struct *work) { struct svc_i3c_master *master =3D container_of(work, struct svc_i3c_maste= r, ibi_work); @@ -1113,7 +1131,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master = *master, * start. */ if (SVC_I3C_MSTATUS_IBIWON(reg)) { - writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + svc_i3c_master_handle_ibi_won(master, reg); continue; } =20 --=20 2.34.1 From nobody Sun Feb 8 13:39:22 2026 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11011005.outbound.protection.outlook.com [52.101.65.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1EAEC1A0B12 for ; Tue, 13 Aug 2024 15:15:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.65.5 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723562149; cv=fail; b=NS012t2VvTnFbSoVRuEiAzitSN8YKbzetdH4UEixkOsmFkbYieXalsRyaiMIKZFFHUlZl/0tOvvf+SqlNf2vNeYwjGfebmwoF+q2uQ4ZzihH1PkyxzbK4KDmHlp3UdhatnoE8RW8fXAnQG2+CiUtdy5qlXMW7UYX6HxKfF2l6/I= ARC-Message-Signature: i=2; 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Address arbitration may occur at this time if other devices trigger HJ, IBI, or CR events. When IBIWON happen at REQUEST_PROC_DAA, nack IBI request then use repeat start to continue current dynamtica address assign. Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index d665639523e3c..161ccd824443b 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -808,6 +808,9 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_= master *master, int ret, i; =20 while (true) { + /* clean SVC_I3C_MINT_IBIWON w1c bits */ + writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS); + /* SVC_I3C_MCTRL_REQUEST_PROC_DAA have two mode, ENTER DAA or PROCESS DA= A. * * ENTER DAA: @@ -859,6 +862,9 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_= master *master, ret =3D svc_i3c_master_readb(master, data, 2); if (ret) break; + } else if (SVC_I3C_MSTATUS_IBIWON(reg)) { + svc_i3c_master_handle_ibi_won(master, reg); + continue; } else if (SVC_I3C_MSTATUS_MCTRLDONE(reg)) { if (SVC_I3C_MSTATUS_STATE_IDLE(reg) && SVC_I3C_MSTATUS_COMPLETE(reg)) { --=20 2.34.1 From nobody Sun Feb 8 13:39:22 2026 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11011037.outbound.protection.outlook.com [52.101.65.37]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5854A1A0714 for ; 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But maximum stall time is 100us. We have to disable irq and schedule during whole I3C transaction, otherwise, I3C bus timeout will happen if any irq or schedule happen during transaction. Replace mutex with spinlock_saveirq() to make sure finish whole i3c transaction without stall SCL more than 100us. Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index 161ccd824443b..fbb6cef405577 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -432,7 +432,16 @@ static void svc_i3c_master_ibi_work(struct work_struct= *work) u32 status, val; int ret; =20 - mutex_lock(&master->lock); + /* + * According to I3C spec ver 1.1, 09-Jun-2021, section 5.1.2.5: + * + * The I3C Controller shall hold SCL Low while the Bus is in I3C/I2C Tran= sfer, ACK/NACK + * Phase. But maximum stall time is 100us. We have to disable irq and sch= edule during whole + * I3C transaction, otherwise, I3C bus timeout will happen if any irq or = schedule happen + * between transaction.. + */ + guard(spinlock_irqsave)(&master->xferqueue.lock); + /* * IBIWON may be set before SVC_I3C_MCTRL_REQUEST_AUTO_IBI, causing * readl_relaxed_poll_timeout() to return immediately. Consequently, @@ -452,7 +461,7 @@ static void svc_i3c_master_ibi_work(struct work_struct = *work) master->regs + SVC_I3C_MCTRL); =20 /* Wait for IBIWON, should take approximately 100us */ - ret =3D readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val, + ret =3D readl_relaxed_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS,= val, SVC_I3C_MSTATUS_IBIWON(val), 0, 1000); if (ret) { dev_err(master->dev, "Timeout when polling for IBIWON\n"); @@ -525,7 +534,6 @@ static void svc_i3c_master_ibi_work(struct work_struct = *work) =20 reenable_ibis: svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); - mutex_unlock(&master->lock); } =20 static irqreturn_t svc_i3c_master_irq_handler(int irq, void *dev_id) --=20 2.34.1 From nobody Sun Feb 8 13:39:22 2026 Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazon11012035.outbound.protection.outlook.com [52.101.66.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E116A1A2C03 for ; 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Add command done check at svc_i3c_master_nack(ack)_ibi() and change return type to int to indicate wait done timeout. Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index fbb6cef405577..0de95f406c95b 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -384,10 +384,12 @@ static int svc_i3c_master_handle_ibi(struct svc_i3c_m= aster *master, return 0; } =20 -static void svc_i3c_master_ack_ibi(struct svc_i3c_master *master, +static int svc_i3c_master_ack_ibi(struct svc_i3c_master *master, bool mandatory_byte) { unsigned int ibi_ack_nack; + int ret; + u32 reg; =20 ibi_ack_nack =3D SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK; if (mandatory_byte) @@ -396,18 +398,31 @@ static void svc_i3c_master_ack_ibi(struct svc_i3c_mas= ter *master, ibi_ack_nack |=3D SVC_I3C_MCTRL_IBIRESP_ACK_WITHOUT_BYTE; =20 writel(ibi_ack_nack, master->regs + SVC_I3C_MCTRL); + + ret =3D readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, reg, + SVC_I3C_MSTATUS_MCTRLDONE(reg), 1, 1000); + return ret; + } =20 -static void svc_i3c_master_nack_ibi(struct svc_i3c_master *master) +static int svc_i3c_master_nack_ibi(struct svc_i3c_master *master) { + int ret; + u32 reg; + writel(SVC_I3C_MCTRL_REQUEST_IBI_ACKNACK | SVC_I3C_MCTRL_IBIRESP_NACK, master->regs + SVC_I3C_MCTRL); + + ret =3D readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, reg, + SVC_I3C_MSTATUS_MCTRLDONE(reg), 1, 1000); + return ret; } =20 static int svc_i3c_master_handle_ibi_won(struct svc_i3c_master *master, u3= 2 mstatus) { u32 ibitype; + int ret =3D 0; =20 ibitype =3D SVC_I3C_MSTATUS_IBITYPE(mstatus); =20 @@ -417,10 +432,10 @@ static int svc_i3c_master_handle_ibi_won(struct svc_i= 3c_master *master, u32 msta switch (ibitype) { case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: - svc_i3c_master_nack_ibi(master); + ret =3D svc_i3c_master_nack_ibi(master); } =20 - return 0; + return ret; } =20 static void svc_i3c_master_ibi_work(struct work_struct *work) @@ -871,7 +886,8 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_= master *master, if (ret) break; } else if (SVC_I3C_MSTATUS_IBIWON(reg)) { - svc_i3c_master_handle_ibi_won(master, reg); + if (svc_i3c_master_handle_ibi_won(master, reg)) + break; continue; } else if (SVC_I3C_MSTATUS_MCTRLDONE(reg)) { if (SVC_I3C_MSTATUS_STATE_IDLE(reg) && @@ -1145,7 +1161,8 @@ static int svc_i3c_master_xfer(struct svc_i3c_master = *master, * start. */ if (SVC_I3C_MSTATUS_IBIWON(reg)) { - svc_i3c_master_handle_ibi_won(master, reg); + if (svc_i3c_master_handle_ibi_won(master, reg)) + goto emit_stop; continue; } =20 --=20 2.34.1 From nobody Sun Feb 8 13:39:22 2026 Received: from AS8PR04CU009.outbound.protection.outlook.com (mail-westeuropeazon11011002.outbound.protection.outlook.com [52.101.70.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 337B01A2564 for ; Tue, 13 Aug 2024 15:16:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.70.2 ARC-Seal: i=2; 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i < dev_nb; i++) { ret =3D i3c_master_add_i3c_dev_locked(m, addrs[i]); if (ret) goto rpm_out; } } If two devices (A and B) are detected in DAA and address 0xa is assigned to device A and 0xb to device B, a failure in i3c_master_add_i3c_dev_locked() for device A (addr: 0xa) could prevent device B (addr: 0xb) from being registered on the bus. The I3C stack might still consider 0xb a free address. If a subsequent Hotjoin occurs, 0xb might be assigned to Device A, causing both devices A and B to use the same address 0xb, violating the I3C specification. The return value for i3c_master_add_i3c_dev_locked() should not be checked because subsequent steps will scan the entire I3C bus, independent of whether i3c_master_add_i3c_dev_locked() returns success. If device A registration fails, there is still a chance to register device B. i3c_master_add_i3c_dev_locked() can reset DAA if a failure occurs while retrieving device information. Cc: stable@kernel.org Fixes: 317bacf960a4 ("i3c: master: add enable(disable) hot join in sys entr= y") Signed-off-by: Frank Li --- drivers/i3c/master/svc-i3c-master.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index 0de95f406c95b..f47e5f4af68c9 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -1041,11 +1041,8 @@ static int svc_i3c_master_do_daa(struct i3c_master_c= ontroller *m) goto rpm_out; =20 /* Register all devices who participated to the core */ - for (i =3D 0; i < dev_nb; i++) { - ret =3D i3c_master_add_i3c_dev_locked(m, addrs[i]); - if (ret) - goto rpm_out; - } + for (i =3D 0; i < dev_nb; i++) + i3c_master_add_i3c_dev_locked(m, addrs[i]); =20 /* Configure IBI auto-rules */ ret =3D svc_i3c_update_ibirules(master); --=20 2.34.1