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From: Quan Nguyen <quan@os.amperecomputing.com>
To: Ryan Chen <ryan_chen@aspeedtech.com>,
	Corey Minyard <minyard@acm.org>, Rob Herring <robh+dt@kernel.org>,
	Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>,
	Brendan Higgins <brendanhiggins@google.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Wolfram Sang <wsa@kernel.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	"openipmi-developer@lists.sourceforge.net" 
	<openipmi-developer@lists.sourceforge.net>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>
Cc: Open Source Submission <patches@amperecomputing.com>,
	"Thang Q . Nguyen" <thang@os.amperecomputing.com>,
	Phong Vo <phong@os.amperecomputing.com>,
	"openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: Re: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy()
Date: Thu, 20 May 2021 21:10:21 +0700	[thread overview]
Message-ID: <3eba7d01-2507-17c6-2b27-7f1a7e286413@os.amperecomputing.com> (raw)
In-Reply-To: <HK0PR06MB3380BFA9FD9EF8F51F9DCC23F22A9@HK0PR06MB3380.apcprd06.prod.outlook.com>

On 20/05/2021 18:06, Ryan Chen wrote:
>> -----Original Message-----
>> From: openbmc
>> <openbmc-bounces+ryan_chen=aspeedtech.com@lists.ozlabs.org> On Behalf
>> Of Quan Nguyen
>> Sent: Wednesday, May 19, 2021 3:50 PM
>> To: Corey Minyard <minyard@acm.org>; Rob Herring <robh+dt@kernel.org>;
>> Joel Stanley <joel@jms.id.au>; Andrew Jeffery <andrew@aj.id.au>; Brendan
>> Higgins <brendanhiggins@google.com>; Benjamin Herrenschmidt
>> <benh@kernel.crashing.org>; Wolfram Sang <wsa@kernel.org>; Philipp Zabel
>> <p.zabel@pengutronix.de>; 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 <patches@amperecomputing.com>; Thang Q .
>> Nguyen <thang@os.amperecomputing.com>; Phong Vo
>> <phong@os.amperecomputing.com>; 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 <quan@os.amperecomputing.com>
>> ---
>> 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

  reply	other threads:[~2021-05-20 14:11 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19  7:49 [PATCH v3 0/7] Add Aspeed SSIF BMC driver Quan Nguyen
2021-05-19  7:49 ` [PATCH v3 1/7] i2c: i2c-core-smbus: Expose PEC calculate function for generic use Quan Nguyen
2021-06-25 15:02   ` Wolfram Sang
2021-05-19  7:49 ` [PATCH v3 2/7] ipmi: ssif_bmc: Add SSIF BMC driver Quan Nguyen
2021-05-19 12:30   ` Corey Minyard
2021-05-20 14:19     ` Quan Nguyen
2021-05-19  7:49 ` [PATCH v3 3/7] i2c: aspeed: Fix unhandled Tx done with NAK Quan Nguyen
2021-05-19 23:28   ` Joel Stanley
2021-05-20 11:28     ` Ryan Chen
2021-05-20 14:15       ` Quan Nguyen
2021-05-20 13:48     ` Quan Nguyen
2021-05-19  7:49 ` [PATCH v3 4/7] i2c: aspeed: Acknowledge Tx done w/wo ACK irq late Quan Nguyen
2021-05-19 23:43   ` Joel Stanley
2021-05-20  1:19     ` Guenter Roeck
2021-05-20 14:03       ` Quan Nguyen
2021-05-20 13:52     ` Quan Nguyen
2021-05-19  7:49 ` [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy() Quan Nguyen
2021-05-20 11:06   ` Ryan Chen
2021-05-20 14:10     ` Quan Nguyen [this message]
2021-05-21  6:09       ` Ryan Chen
2021-05-28  1:00         ` Quan Nguyen
2021-05-24 10:06   ` Ryan Chen
2021-05-24 10:20     ` Quan Nguyen
2021-05-24 10:36       ` Ryan Chen
2021-05-24 10:48         ` Quan Nguyen
2021-05-25 10:30           ` Ryan Chen
2021-05-28  0:53             ` Quan Nguyen
2021-05-28  2:57               ` Ryan Chen
2021-06-07 14:57   ` Graeme Gregory
2021-05-19  7:49 ` [PATCH v3 6/7] ipmi: ssif_bmc: Add Aspeed SSIF BMC driver Quan Nguyen
2021-05-19  7:49 ` [PATCH v3 7/7] bindings: ipmi: Add binding for " Quan Nguyen
2021-05-19 15:29   ` Rob Herring
2021-05-20 14:24     ` Quan Nguyen
2021-05-19 12:34 ` [PATCH v3 0/7] Add " Corey Minyard
2021-05-20 14:23   ` Quan Nguyen

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