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From: Graeme Gregory <graeme@nuviainc.com>
To: Quan Nguyen <quan@os.amperecomputing.com>
Cc: 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,
	Open Source Submission <patches@amperecomputing.com>,
	"Thang Q . Nguyen" <thang@os.amperecomputing.com>,
	Phong Vo <phong@os.amperecomputing.com>,
	openbmc@lists.ozlabs.org
Subject: Re: [PATCH v3 5/7] i2c: aspeed: Add aspeed_set_slave_busy()
Date: Mon, 7 Jun 2021 15:57:22 +0100	[thread overview]
Message-ID: <20210607145722.GA2682@ggregory-linuxws> (raw)
In-Reply-To: <20210519074934.20712-6-quan@os.amperecomputing.com>

On Wed, May 19, 2021 at 02:49:32PM +0700, Quan Nguyen wrote:
> 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);

This as far as I can see is still a recursive spinlock, and the spinlock
debugger seems to agree with me.

Graeme

> +
> +	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
> 

  parent reply	other threads:[~2021-06-07 14:57 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
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 [this message]
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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