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Thu, 20 May 2021 14:10:39 +0000 Subject: Re: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy() To: Ryan Chen , Corey Minyard , Rob Herring , Joel Stanley , Andrew Jeffery , Brendan Higgins , Benjamin Herrenschmidt , Wolfram Sang , Philipp Zabel , "openipmi-developer@lists.sourceforge.net" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-aspeed@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , "linux-i2c@vger.kernel.org" Cc: Open Source Submission , "Thang Q . Nguyen" , Phong Vo , "openbmc@lists.ozlabs.org" References: <20210519074934.20712-1-quan@os.amperecomputing.com> <20210519074934.20712-6-quan@os.amperecomputing.com> From: Quan Nguyen Message-ID: <3eba7d01-2507-17c6-2b27-7f1a7e286413@os.amperecomputing.com> Date: Thu, 20 May 2021 21:10:21 +0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 In-Reply-To: Content-Language: en-US X-Originating-IP: [2402:800:623c:5f9b:6031:ff4f:8fc2:44d0] X-ClientProxiedBy: HK2P15301CA0005.APCP153.PROD.OUTLOOK.COM (2603:1096:202:1::15) To MW2PR0102MB3482.prod.exchangelabs.com (2603:10b6:302:c::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2402:800:623c:5f9b:6031:ff4f:8fc2:44d0] (2402:800:623c:5f9b:6031:ff4f:8fc2:44d0) by HK2P15301CA0005.APCP153.PROD.OUTLOOK.COM (2603:1096:202:1::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.2 via Frontend Transport; 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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 20/05/2021 18:06, Ryan Chen wrote: >> -----Original Message----- >> From: openbmc >> On Behalf >> Of Quan Nguyen >> Sent: Wednesday, May 19, 2021 3:50 PM >> To: Corey Minyard ; Rob Herring ; >> Joel Stanley ; Andrew Jeffery ; Brendan >> Higgins ; Benjamin Herrenschmidt >> ; Wolfram Sang ; Philipp Zabel >> ; openipmi-developer@lists.sourceforge.net; >> devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; >> linux-aspeed@lists.ozlabs.org; linux-kernel@vger.kernel.org; >> linux-i2c@vger.kernel.org >> Cc: Open Source Submission ; Thang Q . >> Nguyen ; Phong Vo >> ; openbmc@lists.ozlabs.org >> Subject: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy() >> >> Slave i2c device on AST2500 received a lot of slave irq while it is busy >> processing the response. To handle this case, adds and exports >> aspeed_set_slave_busy() for controller to temporary stop slave irq while slave >> is handling the response, and re-enable them again when the response is ready. >> >> Signed-off-by: Quan Nguyen >> --- >> v3: >> + First introduce in v3 [Quan] >> >> drivers/i2c/busses/i2c-aspeed.c | 20 ++++++++++++++++++++ >> 1 file changed, 20 insertions(+) >> >> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c >> index b2e9c8f0ddf7..9926d04831a2 100644 >> --- a/drivers/i2c/busses/i2c-aspeed.c >> +++ b/drivers/i2c/busses/i2c-aspeed.c >> @@ -944,6 +944,26 @@ static int aspeed_i2c_init(struct aspeed_i2c_bus >> *bus, >> return 0; >> } >> >> +#if IS_ENABLED(CONFIG_I2C_SLAVE) >> +void aspeed_set_slave_busy(struct i2c_adapter *adap, bool busy) { >> + struct aspeed_i2c_bus *bus = i2c_get_adapdata(adap); >> + unsigned long current_mask, flags; >> + >> + spin_lock_irqsave(&bus->lock, flags); >> + >> + current_mask = readl(bus->base + ASPEED_I2C_INTR_CTRL_REG); >> + if (busy) >> + current_mask &= ~(ASPEED_I2CD_INTR_RX_DONE | >> ASPEED_I2CD_INTR_SLAVE_MATCH); >> + else >> + current_mask |= ASPEED_I2CD_INTR_RX_DONE | >> ASPEED_I2CD_INTR_SLAVE_MATCH; >> + writel(current_mask, bus->base + ASPEED_I2C_INTR_CTRL_REG); >> + >> + spin_unlock_irqrestore(&bus->lock, flags); } >> +EXPORT_SYMBOL_GPL(aspeed_set_slave_busy); >> +#endif >> + >> static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus) { >> struct platform_device *pdev = to_platform_device(bus->dev); >> -- >> 2.28.0 > > Hello, > The better idea is use disable i2c slave mode. > Due to if i2c controller running in slave will get slave match, and latch the SCL. > Until cpu clear interrupt status. > Ryan > Thanks Ryan, Do you mean to enable/disable slave function as per example code below ? /* Turn on slave mode. */ func_ctrl_reg_val = readl(bus->base + ASPEED_I2C_FUN_CTRL_REG); func_ctrl_reg_val |= ASPEED_I2CD_SLAVE_EN; writel(func_ctrl_reg_val, bus->base + ASPEED_I2C_FUN_CTRL_REG); Will try this idea. - Quan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel