-----Original Message-----
From: openbmc
[off-list ref] On Behalf
Of Quan Nguyen
Sent: Wednesday, May 19, 2021 3:50 PM
To: Corey Minyard <redacted>; Rob Herring <robh+dt@kernel.org>;
Joel Stanley [off-list ref]; Andrew Jeffery [off-list ref]; Brendan
Higgins [off-list ref]; Benjamin Herrenschmidt
[off-list ref]; Wolfram Sang [off-list ref]; Philipp Zabel
[off-list ref]; 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 <redacted>; Thang Q .
Nguyen [off-list ref]; Phong Vo
[off-list ref]; 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);