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charset="utf-8" Add hotjoin entry in sys file system allow user enable/disable hotjoin feature. Add (*enable(disable)_hotjoin)() to i3c_master_controller_ops. Add api i3c_master_enable(disable)_hotjoin(); Signed-off-by: Frank Li --- Notes: Change from v4 to v5 - using kstrtobool() > + if (!master || > + !master->ops || > + !master->ops->enable_hotjoin || > + !master->ops->disable_hotjoin > + ) =20 break into two if, which will be more clear. and one line is 101 chars. =20 Change from v3 to v4 -none Change from v1 to v2. - Hotjoin control by sys entry, default enable hotjoin, which standard = i3c feature, user can disable by echo 0 > /sys/bus/i3c/i3c-0/hotjoin drivers/i3c/master.c | 83 ++++++++++++++++++++++++++++++++++++++ include/linux/i3c/master.h | 5 +++ 2 files changed, 88 insertions(+) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 08aeb69a78003..d3b56c9f601e2 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -526,6 +526,88 @@ static ssize_t i2c_scl_frequency_show(struct device *d= ev, } static DEVICE_ATTR_RO(i2c_scl_frequency); =20 +static int i3c_set_hotjoin(struct i3c_master_controller *master, bool enab= le) +{ + int ret; + + if (!master || !master->ops) + return -EINVAL; + + if (!master->ops->enable_hotjoin || !master->ops->disable_hotjoin) + return -EINVAL; + + i3c_bus_normaluse_lock(&master->bus); + + if (enable) + ret =3D master->ops->enable_hotjoin(master); + else + ret =3D master->ops->disable_hotjoin(master); + + master->hotjoin =3D enable; + + i3c_bus_normaluse_unlock(&master->bus); + + return ret; +} + +static ssize_t hotjoin_store(struct device *dev, struct device_attribute *= attr, + const char *buf, size_t count) +{ + struct i3c_bus *i3cbus =3D dev_to_i3cbus(dev); + int ret; + bool res; + + if (!i3cbus->cur_master) + return -EINVAL; + + if (kstrtobool(buf, &res)) + return -EINVAL; + + ret =3D i3c_set_hotjoin(i3cbus->cur_master->common.master, res); + if (ret) + return ret; + + return count; +} + +/* + * i3c_master_enable_hotjoin - Enable hotjoin + * @master: I3C master object + * + * Return: a 0 in case of success, an negative error code otherwise. + */ +int i3c_master_enable_hotjoin(struct i3c_master_controller *master) +{ + return i3c_set_hotjoin(master, true); +} +EXPORT_SYMBOL_GPL(i3c_master_enable_hotjoin); + +/* + * i3c_master_disable_hotjoin - Disable hotjoin + * @master: I3C master object + * + * Return: a 0 in case of success, an negative error code otherwise. + */ +int i3c_master_disable_hotjoin(struct i3c_master_controller *master) +{ + return i3c_set_hotjoin(master, false); +} +EXPORT_SYMBOL_GPL(i3c_master_disable_hotjoin); + +static ssize_t hotjoin_show(struct device *dev, struct device_attribute *d= a, char *buf) +{ + struct i3c_bus *i3cbus =3D dev_to_i3cbus(dev); + ssize_t ret; + + i3c_bus_normaluse_lock(i3cbus); + ret =3D sysfs_emit(buf, "%d\n", i3cbus->cur_master->common.master->hotjoi= n); + i3c_bus_normaluse_unlock(i3cbus); + + return ret; +} + +static DEVICE_ATTR_RW(hotjoin); + static struct attribute *i3c_masterdev_attrs[] =3D { &dev_attr_mode.attr, &dev_attr_current_master.attr, @@ -536,6 +618,7 @@ static struct attribute *i3c_masterdev_attrs[] =3D { &dev_attr_pid.attr, &dev_attr_dynamic_address.attr, &dev_attr_hdrcap.attr, + &dev_attr_hotjoin.attr, NULL, }; ATTRIBUTE_GROUPS(i3c_masterdev); diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index 0b52da4f23467..65b8965968af2 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -452,6 +452,8 @@ struct i3c_master_controller_ops { int (*disable_ibi)(struct i3c_dev_desc *dev); void (*recycle_ibi_slot)(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot); + int (*enable_hotjoin)(struct i3c_master_controller *master); + int (*disable_hotjoin)(struct i3c_master_controller *master); }; =20 /** @@ -487,6 +489,7 @@ struct i3c_master_controller { const struct i3c_master_controller_ops *ops; unsigned int secondary : 1; unsigned int init_done : 1; + unsigned int hotjoin: 1; struct { struct list_head i3c; struct list_head i2c; @@ -543,6 +546,8 @@ int i3c_master_register(struct i3c_master_controller *m= aster, const struct i3c_master_controller_ops *ops, bool secondary); void i3c_master_unregister(struct i3c_master_controller *master); +int i3c_master_enable_hotjoin(struct i3c_master_controller *master); +int i3c_master_disable_hotjoin(struct i3c_master_controller *master); =20 /** * i3c_dev_get_master_data() - get master private data attached to an I3C --=20 2.34.1 From nobody Tue Dec 16 18:23:10 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB5FCC4167B for ; Fri, 1 Dec 2023 22:26:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1441844AbjLAW0D (ORCPT ); Fri, 1 Dec 2023 17:26:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1441839AbjLAWZ4 (ORCPT ); Fri, 1 Dec 2023 17:25:56 -0500 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2088.outbound.protection.outlook.com [40.107.22.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A3A1194 for ; 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Fri, 1 Dec 2023 22:26:00 +0000 From: Frank Li To: miquel.raynal@bootlin.com Cc: Frank.li@nxp.com, alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, imx@lists.linux.dev, joe@perches.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, zbigniew.lukwinski@linux.intel.com Subject: [v5 resend 2/6] i3c: master: svc: add hot join support Date: Fri, 1 Dec 2023 17:25:28 -0500 Message-Id: <20231201222532.2431484-3-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201222532.2431484-1-Frank.Li@nxp.com> References: <20231201222532.2431484-1-Frank.Li@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BY5PR17CA0022.namprd17.prod.outlook.com (2603:10b6:a03:1b8::35) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|AS4PR04MB9573:EE_ X-MS-Office365-Filtering-Correlation-Id: 51db0ffc-456d-40c5-c01b-08dbf2bc7f00 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" Add hot join support for svc master controller. Disable hot join defaultly. User can use sys entry to enable hot join. Signed-off-by: Frank Li --- Notes: Change from v4 to v5 - default disable hotjoin - add help func is_events_enabled() =20 Change from v3 to v4 -fix build warning =20 All warnings (new ones prefixed by >>): =20 drivers/i3c/master/svc-i3c-master.c:212: warning: Function parameter= or member 'lock' not described in 'svc_i3c_master' >> drivers/i3c/master/svc-i3c-master.c:212: warning: Function parameter= or member 'enabled_events' not described in 'svc_i3c_master' 2 warnings as Errors drivers/i3c/master/svc-i3c-master.c | 61 +++++++++++++++++++++++++++-- 1 file changed, 57 insertions(+), 4 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index 6b6bdd163af4f..f2058a36f869b 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -128,6 +128,9 @@ /* This parameter depends on the implementation and may be tuned */ #define SVC_I3C_FIFO_SIZE 16 =20 +#define SVC_I3C_EVENT_IBI BIT(0) +#define SVC_I3C_EVENT_HOTJOIN BIT(1) + struct svc_i3c_cmd { u8 addr; bool rnw; @@ -176,6 +179,7 @@ struct svc_i3c_regs_save { * @ibi.tbq_slot: To be queued IBI slot * @ibi.lock: IBI lock * @lock: Transfer lock, protect between IBI work thread and callbacks fro= m master + * @enabled_events: Bit masks for enable events (IBI, HotJoin). */ struct svc_i3c_master { struct i3c_master_controller base; @@ -205,6 +209,7 @@ struct svc_i3c_master { spinlock_t lock; } ibi; struct mutex lock; + int enabled_events; }; =20 /** @@ -219,6 +224,11 @@ struct svc_i3c_i2c_dev_data { struct i3c_generic_ibi_pool *ibi_pool; }; =20 +static inline bool is_events_enabled(struct svc_i3c_master *master, u32 ma= sk) +{ + return !!(master->enabled_events & mask); +} + static bool svc_i3c_master_error(struct svc_i3c_master *master) { u32 mstatus, merrwarn; @@ -428,13 +438,16 @@ static void svc_i3c_master_ibi_work(struct work_struc= t *work) switch (ibitype) { case SVC_I3C_MSTATUS_IBITYPE_IBI: dev =3D svc_i3c_master_dev_from_addr(master, ibiaddr); - if (!dev) + if (!dev || !is_events_enabled(master, SVC_I3C_EVENT_IBI)) svc_i3c_master_nack_ibi(master); else svc_i3c_master_handle_ibi(master, dev); break; case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: - svc_i3c_master_ack_ibi(master, false); + if (is_events_enabled(master, SVC_I3C_EVENT_HOTJOIN)) + svc_i3c_master_ack_ibi(master, false); + else + svc_i3c_master_nack_ibi(master); break; case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: svc_i3c_master_nack_ibi(master); @@ -471,7 +484,9 @@ static void svc_i3c_master_ibi_work(struct work_struct = *work) svc_i3c_master_emit_stop(master); break; case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN: - queue_work(master->base.wq, &master->hj_work); + svc_i3c_master_emit_stop(master); + if (is_events_enabled(master, SVC_I3C_EVENT_HOTJOIN)) + queue_work(master->base.wq, &master->hj_work); break; case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST: default: @@ -1471,6 +1486,7 @@ static int svc_i3c_master_enable_ibi(struct i3c_dev_d= esc *dev) return ret; } =20 + master->enabled_events |=3D SVC_I3C_EVENT_IBI; svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); =20 return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); @@ -1482,7 +1498,9 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_= desc *dev) struct svc_i3c_master *master =3D to_svc_i3c_master(m); int ret; =20 - svc_i3c_master_disable_interrupts(master); + master->enabled_events &=3D ~SVC_I3C_EVENT_IBI; + if (!master->enabled_events) + svc_i3c_master_disable_interrupts(master); =20 ret =3D i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); =20 @@ -1492,6 +1510,39 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev= _desc *dev) return ret; } =20 +static int svc_i3c_master_enable_hotjoin(struct i3c_master_controller *m) +{ + struct svc_i3c_master *master =3D to_svc_i3c_master(m); + int ret; + + ret =3D pm_runtime_resume_and_get(master->dev); + if (ret < 0) { + dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__); + return ret; + } + + master->enabled_events |=3D SVC_I3C_EVENT_HOTJOIN; + + svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); + + return 0; +} + +static int svc_i3c_master_disable_hotjoin(struct i3c_master_controller *m) +{ + struct svc_i3c_master *master =3D to_svc_i3c_master(m); + + master->enabled_events &=3D ~SVC_I3C_EVENT_HOTJOIN; + + if (!master->enabled_events) + svc_i3c_master_disable_interrupts(master); + + pm_runtime_mark_last_busy(master->dev); + pm_runtime_put_autosuspend(master->dev); + + return 0; +} + static void svc_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) { @@ -1518,6 +1569,8 @@ static const struct i3c_master_controller_ops svc_i3c= _master_ops =3D { .recycle_ibi_slot =3D svc_i3c_master_recycle_ibi_slot, .enable_ibi =3D svc_i3c_master_enable_ibi, .disable_ibi =3D svc_i3c_master_disable_ibi, + .enable_hotjoin =3D svc_i3c_master_enable_hotjoin, + .disable_hotjoin =3D svc_i3c_master_disable_hotjoin, }; =20 static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master) --=20 2.34.1 From nobody Tue Dec 16 18:23:10 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2CA7DC4167B for ; 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By contrast, in I3C this bit allows the Target to end a Read, and allows the Controller to Abort a Read. In SDR terms, the ninth bit of Read data is referred to as the T-Bit (for =E2=80=98Transition=E2=80=99)" I3C allow devices early terminate data transfer. So need "actual_len" field to indicate how much get by i3c_priv_xfer. Reviewed-by: Miquel Raynal Signed-off-by: Frank Li --- Notes: change from v4 to v5 - Add Miquel review tag include/linux/i3c/device.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h index 90fa83464f003..ef6217da8253b 100644 --- a/include/linux/i3c/device.h +++ b/include/linux/i3c/device.h @@ -54,6 +54,7 @@ enum i3c_hdr_mode { * struct i3c_priv_xfer - I3C SDR private transfer * @rnw: encodes the transfer direction. true for a read, false for a write * @len: transfer length in bytes of the transfer + * @actual_len: actual length in bytes are transferred by the controller * @data: input/output buffer * @data.in: input buffer. Must point to a DMA-able buffer * @data.out: output buffer. Must point to a DMA-able buffer @@ -62,6 +63,7 @@ enum i3c_hdr_mode { struct i3c_priv_xfer { u8 rnw; u16 len; + u16 actual_len; union { void *in; const void *out; --=20 2.34.1 From nobody Tue Dec 16 18:23:10 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3CFD0C4167B for ; Fri, 1 Dec 2023 22:26:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1441863AbjLAW0J (ORCPT ); Fri, 1 Dec 2023 17:26:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231181AbjLAW0C (ORCPT ); Fri, 1 Dec 2023 17:26:02 -0500 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2062.outbound.protection.outlook.com [40.107.22.62]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDC0894 for ; 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Fri, 1 Dec 2023 22:26:05 +0000 From: Frank Li To: miquel.raynal@bootlin.com Cc: Frank.li@nxp.com, alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, imx@lists.linux.dev, joe@perches.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, zbigniew.lukwinski@linux.intel.com Subject: [v5 resend 4/6] i3c: master: svc: rename read_len as actual_len Date: Fri, 1 Dec 2023 17:25:30 -0500 Message-Id: <20231201222532.2431484-5-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201222532.2431484-1-Frank.Li@nxp.com> References: <20231201222532.2431484-1-Frank.Li@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BY5PR17CA0022.namprd17.prod.outlook.com (2603:10b6:a03:1b8::35) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|AS4PR04MB9573:EE_ X-MS-Office365-Filtering-Correlation-Id: 8ecc0795-faf3-4e4d-d547-08dbf2bc8221 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" I3C transfer (SDR), target can early terminate read transfer. I3C transfer (HDR), target can end write transfer. I2C transfer, target can NACK write transfer. 'actual_len' is better name than 'read_len'. Reviewed-by: Miquel Raynal Signed-off-by: Frank Li --- Notes: change from v4 to v5: use i3c: master: svc: prefix drivers/i3c/master/svc-i3c-master.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index f2058a36f869b..13a8b3c2aa541 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -137,7 +137,7 @@ struct svc_i3c_cmd { u8 *in; const void *out; unsigned int len; - unsigned int read_len; + unsigned int actual_len; bool continued; }; =20 @@ -1038,7 +1038,7 @@ static int svc_i3c_master_write(struct svc_i3c_master= *master, static int svc_i3c_master_xfer(struct svc_i3c_master *master, bool rnw, unsigned int xfer_type, u8 addr, u8 *in, const u8 *out, unsigned int xfer_len, - unsigned int *read_len, bool continued) + unsigned int *actual_len, bool continued) { u32 reg; int ret; @@ -1051,7 +1051,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master = *master, SVC_I3C_MCTRL_IBIRESP_NACK | SVC_I3C_MCTRL_DIR(rnw) | SVC_I3C_MCTRL_ADDR(addr) | - SVC_I3C_MCTRL_RDTERM(*read_len), + SVC_I3C_MCTRL_RDTERM(*actual_len), master->regs + SVC_I3C_MCTRL); =20 ret =3D readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, @@ -1089,7 +1089,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master = *master, goto emit_stop; =20 if (rnw) - *read_len =3D ret; + *actual_len =3D ret; =20 ret =3D readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg, SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000); @@ -1171,7 +1171,7 @@ static void svc_i3c_master_start_xfer_locked(struct s= vc_i3c_master *master) =20 ret =3D svc_i3c_master_xfer(master, cmd->rnw, xfer->type, cmd->addr, cmd->in, cmd->out, - cmd->len, &cmd->read_len, + cmd->len, &cmd->actual_len, cmd->continued); if (ret) break; @@ -1257,7 +1257,7 @@ static int svc_i3c_master_send_bdcast_ccc_cmd(struct = svc_i3c_master *master, cmd->in =3D NULL; cmd->out =3D buf; cmd->len =3D xfer_len; - cmd->read_len =3D 0; + cmd->actual_len =3D 0; cmd->continued =3D false; =20 mutex_lock(&master->lock); @@ -1277,7 +1277,7 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct = svc_i3c_master *master, struct i3c_ccc_cmd *ccc) { unsigned int xfer_len =3D ccc->dests[0].payload.len; - unsigned int read_len =3D ccc->rnw ? xfer_len : 0; + unsigned int actual_len =3D ccc->rnw ? xfer_len : 0; struct svc_i3c_xfer *xfer; struct svc_i3c_cmd *cmd; int ret; @@ -1295,7 +1295,7 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct = svc_i3c_master *master, cmd->in =3D NULL; cmd->out =3D &ccc->id; cmd->len =3D 1; - cmd->read_len =3D 0; + cmd->actual_len =3D 0; cmd->continued =3D true; =20 /* Directed message */ @@ -1305,7 +1305,7 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct = svc_i3c_master *master, cmd->in =3D ccc->rnw ? ccc->dests[0].payload.data : NULL; cmd->out =3D ccc->rnw ? NULL : ccc->dests[0].payload.data, cmd->len =3D xfer_len; - cmd->read_len =3D read_len; + cmd->actual_len =3D actual_len; cmd->continued =3D false; =20 mutex_lock(&master->lock); @@ -1314,8 +1314,8 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct = svc_i3c_master *master, svc_i3c_master_dequeue_xfer(master, xfer); mutex_unlock(&master->lock); =20 - if (cmd->read_len !=3D xfer_len) - ccc->dests[0].payload.len =3D cmd->read_len; + if (cmd->actual_len !=3D xfer_len) + ccc->dests[0].payload.len =3D cmd->actual_len; =20 ret =3D xfer->ret; svc_i3c_master_free_xfer(xfer); @@ -1365,7 +1365,7 @@ static int svc_i3c_master_priv_xfers(struct i3c_dev_d= esc *dev, cmd->in =3D xfers[i].rnw ? xfers[i].data.in : NULL; cmd->out =3D xfers[i].rnw ? NULL : xfers[i].data.out; cmd->len =3D xfers[i].len; - cmd->read_len =3D xfers[i].rnw ? xfers[i].len : 0; + cmd->actual_len =3D xfers[i].rnw ? xfers[i].len : 0; cmd->continued =3D (i + 1) < nxfers; } =20 @@ -1405,7 +1405,7 @@ static int svc_i3c_master_i2c_xfers(struct i2c_dev_de= sc *dev, cmd->in =3D cmd->rnw ? xfers[i].buf : NULL; cmd->out =3D cmd->rnw ? 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Fri, 1 Dec 2023 22:26:08 +0000 From: Frank Li To: miquel.raynal@bootlin.com Cc: Frank.li@nxp.com, alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, imx@lists.linux.dev, joe@perches.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, zbigniew.lukwinski@linux.intel.com Subject: [v5 resend 5/6] i3c: master: svc: return actual transfer data len Date: Fri, 1 Dec 2023 17:25:31 -0500 Message-Id: <20231201222532.2431484-6-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201222532.2431484-1-Frank.Li@nxp.com> References: <20231201222532.2431484-1-Frank.Li@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BY5PR17CA0022.namprd17.prod.outlook.com (2603:10b6:a03:1b8::35) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|AS4PR04MB9573:EE_ X-MS-Office365-Filtering-Correlation-Id: 366b7918-1f91-4312-e94a-08dbf2bc83bb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="utf-8" I3C allow devices early terminate data transfer. So set "actual_len" to indicate how much data get by i3c_priv_xfer. Reviewed-by: Miquel Raynal Signed-off-by: Frank Li --- Notes: change from v4 to v5 update prefix add Miquel's review tag drivers/i3c/master/svc-i3c-master.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i= 3c-master.c index 13a8b3c2aa541..bd10bb698da0f 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -138,6 +138,7 @@ struct svc_i3c_cmd { const void *out; unsigned int len; unsigned int actual_len; + struct i3c_priv_xfer *xfer; bool continued; }; =20 @@ -1061,6 +1062,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master = *master, =20 if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) { ret =3D -ENXIO; + *actual_len =3D 0; goto emit_stop; } =20 @@ -1078,6 +1080,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master = *master, */ if (SVC_I3C_MSTATUS_IBIWON(reg)) { ret =3D -ENXIO; + *actual_len =3D 0; goto emit_stop; } =20 @@ -1173,6 +1176,10 @@ static void svc_i3c_master_start_xfer_locked(struct = svc_i3c_master *master) cmd->addr, cmd->in, cmd->out, cmd->len, &cmd->actual_len, cmd->continued); + /* cmd->xfer is NULL if I2C or CCC transfer */ + if (cmd->xfer) + cmd->xfer->actual_len =3D cmd->actual_len; + if (ret) break; } @@ -1360,6 +1367,7 @@ static int svc_i3c_master_priv_xfers(struct i3c_dev_d= esc *dev, for (i =3D 0; i < nxfers; i++) { struct svc_i3c_cmd *cmd =3D &xfer->cmds[i]; =20 + cmd->xfer =3D &xfers[i]; cmd->addr =3D master->addrs[data->index]; cmd->rnw =3D xfers[i].rnw; cmd->in =3D xfers[i].rnw ? xfers[i].data.in : NULL; --=20 2.34.1 From nobody Tue Dec 16 18:23:10 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AEAA5C4167B for ; Fri, 1 Dec 2023 22:26:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1441878AbjLAW0W (ORCPT ); Fri, 1 Dec 2023 17:26:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1441866AbjLAW0K (ORCPT ); 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charset="utf-8" I3C standard 5.1.9.3.15 Get Device Status (GETSTATUS): Get request for one I3C Target Device to return its current status. Add API to fetch it with format1. Signed-off-by: Frank Li --- Notes: See below patch, which call i3c_dev_gettstatus_format1() https://lore.kernel.org/imx/202311070330.5mylauLR-lkp@intel.com/T/#t =20 Change from v4 to v5 - none drivers/i3c/device.c | 24 ++++++++++++++++++++++++ drivers/i3c/internals.h | 1 + drivers/i3c/master.c | 26 ++++++++++++++++++++++++++ include/linux/i3c/device.h | 1 + 4 files changed, 52 insertions(+) diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c index 1a6a8703dbc3a..aa26cf50ab9c6 100644 --- a/drivers/i3c/device.c +++ b/drivers/i3c/device.c @@ -196,6 +196,30 @@ void i3c_device_free_ibi(struct i3c_device *dev) } EXPORT_SYMBOL_GPL(i3c_device_free_ibi); =20 +/** + * i3c_device_getstatus_format1() - Get device status with format 1. + * @dev: device for which you want to get status. + * @status: I3C status format 1 + * + * Return: 0 in case of success, a negative error core otherwise. + */ +int i3c_device_getstatus_format1(struct i3c_device *dev, u16 *status) +{ + int ret =3D -EINVAL; + + if (!status) + return -EINVAL; + + i3c_bus_normaluse_lock(dev->bus); + if (dev->desc) + ret =3D i3c_dev_getstatus_format1_locked(dev->desc, status); + + i3c_bus_normaluse_unlock(dev->bus); + + return ret; +} +EXPORT_SYMBOL_GPL(i3c_device_getstatus_format1); + /** * i3cdev_to_dev() - Returns the device embedded in @i3cdev * @i3cdev: I3C device diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h index 908a807badaf9..976ad26ca79c2 100644 --- a/drivers/i3c/internals.h +++ b/drivers/i3c/internals.h @@ -24,4 +24,5 @@ int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev); int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev, const struct i3c_ibi_setup *req); void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev); +int i3c_dev_getstatus_format1_locked(struct i3c_dev_desc *dev, u16 *status= ); #endif /* I3C_INTERNAL_H */ diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index d3b56c9f601e2..81611a3e3585a 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -2923,6 +2923,32 @@ void i3c_dev_free_ibi_locked(struct i3c_dev_desc *de= v) dev->ibi =3D NULL; } =20 +int i3c_dev_getstatus_format1_locked(struct i3c_dev_desc *dev, u16 *status) +{ + struct i3c_master_controller *master =3D i3c_dev_get_master(dev); + struct i3c_ccc_getstatus *format1; + struct i3c_ccc_cmd_dest dest; + struct i3c_ccc_cmd cmd; + int ret; + + format1 =3D i3c_ccc_cmd_dest_init(&dest, dev->info.dyn_addr, sizeof(*form= at1)); + if (!format1) + return -ENOMEM; + + i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETSTATUS, &dest, 1); + + ret =3D i3c_master_send_ccc_cmd_locked(master, &cmd); + if (ret) + goto out; + + *status =3D be16_to_cpu(format1->status); + +out: + i3c_ccc_cmd_dest_cleanup(&dest); + + return ret; +} + static int __init i3c_init(void) { int res; diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h index ef6217da8253b..5f511bd400f11 100644 --- a/include/linux/i3c/device.h +++ b/include/linux/i3c/device.h @@ -345,4 +345,5 @@ void i3c_device_free_ibi(struct i3c_device *dev); int i3c_device_enable_ibi(struct i3c_device *dev); int i3c_device_disable_ibi(struct i3c_device *dev); =20 +int i3c_device_getstatus_format1(struct i3c_device *dev, u16 *status); #endif /* I3C_DEV_H */ --=20 2.34.1