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b=pVBR0gUsTPnCxtE1rooJAk/b68qH+ODV2EQv8g3ZFTlLuJ8mQN3t2yy/wzFox6c8EGEEf8sHbdypr8/z3XrucCgoMj3gbZbfzKRJw6kpEIYV25bjdpiGOL6LYIKtDJuKKiqIhfn0OAyCfOrkGmsO7ruUMeTv4ZPf2RVH9znoqcg= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) by AS8PR04MB8851.eurprd04.prod.outlook.com (2603:10a6:20b:42e::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7068.13; Thu, 30 Nov 2023 22:44:34 +0000 Received: from AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::95f5:5118:258f:ee40]) by AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::95f5:5118:258f:ee40%6]) with mapi id 15.20.7046.015; Thu, 30 Nov 2023 22:44:34 +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, gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-serial@vger.kernel.org Subject: [PATCH v5 2/7] i3c: master: svc: add hot join support Date: Thu, 30 Nov 2023 17:44:03 -0500 Message-Id: <20231130224408.3591288-3-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231130224408.3591288-1-Frank.Li@nxp.com> References: <20231130224408.3591288-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0212.namprd03.prod.outlook.com (2603:10b6:a03:39f::7) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|AS8PR04MB8851:EE_ X-MS-Office365-Filtering-Correlation-Id: 2bf35edd-8306-4614-65ee-08dbf1f5ecd7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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() Change from v3 to v4 -fix build warning All warnings (new ones prefixed by >>): 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-i3c-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 +#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 from 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; }; /** @@ -219,6 +224,11 @@ struct svc_i3c_i2c_dev_data { struct i3c_generic_ibi_pool *ibi_pool; }; +static inline bool is_events_enabled(struct svc_i3c_master *master, u32 mask) +{ + 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_struct *work) switch (ibitype) { case SVC_I3C_MSTATUS_IBITYPE_IBI: dev = 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_desc *dev) return ret; } + master->enabled_events |= SVC_I3C_EVENT_IBI; svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART); 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 = to_svc_i3c_master(m); int ret; - svc_i3c_master_disable_interrupts(master); + master->enabled_events &= ~SVC_I3C_EVENT_IBI; + if (!master->enabled_events) + svc_i3c_master_disable_interrupts(master); ret = i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR); @@ -1492,6 +1510,39 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev) return ret; } +static int svc_i3c_master_enable_hotjoin(struct i3c_master_controller *m) +{ + struct svc_i3c_master *master = to_svc_i3c_master(m); + int ret; + + ret = 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 |= 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 = to_svc_i3c_master(m); + + master->enabled_events &= ~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 = { .recycle_ibi_slot = svc_i3c_master_recycle_ibi_slot, .enable_ibi = svc_i3c_master_enable_ibi, .disable_ibi = svc_i3c_master_disable_ibi, + .enable_hotjoin = svc_i3c_master_enable_hotjoin, + .disable_hotjoin = svc_i3c_master_disable_hotjoin, }; static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master)