From: ryan_chen <ryan_chen@aspeedtech.com>
To: Brendan Higgins <brendanhiggins@google.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>,
<linux-i2c@vger.kernel.org>, <openbmc@lists.ozlabs.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>
Cc: ryan_chen <ryan_chen@aspeedtech.com>
Subject: [PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status clear race condition.
Date: Wed, 29 Apr 2020 11:37:37 +0800 [thread overview]
Message-ID: <20200429033737.2781-1-ryan_chen@aspeedtech.com> (raw)
In AST2600 there have a slow peripheral bus between CPU
and i2c controller.
Therefore GIC i2c interrupt status clear have delay timing,
when CPU issue write clear i2c controller interrupt status.
To avoid this issue, the driver need have read after write
clear at i2c ISR.
Signed-off-by: ryan_chen <ryan_chen@aspeedtech.com>
---
drivers/i2c/busses/i2c-aspeed.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
index 07c1993274c5..f51702d86a90 100644
--- a/drivers/i2c/busses/i2c-aspeed.c
+++ b/drivers/i2c/busses/i2c-aspeed.c
@@ -603,6 +603,7 @@ static irqreturn_t aspeed_i2c_bus_irq(int irq, void *dev_id)
/* Ack all interrupts except for Rx done */
writel(irq_received & ~ASPEED_I2CD_INTR_RX_DONE,
bus->base + ASPEED_I2C_INTR_STS_REG);
+ readl(bus->base + ASPEED_I2C_INTR_STS_REG);
irq_remaining = irq_received;
#if IS_ENABLED(CONFIG_I2C_SLAVE)
@@ -645,9 +646,11 @@ static irqreturn_t aspeed_i2c_bus_irq(int irq, void *dev_id)
irq_received, irq_handled);
/* Ack Rx done */
- if (irq_received & ASPEED_I2CD_INTR_RX_DONE)
+ if (irq_received & ASPEED_I2CD_INTR_RX_DONE) {
writel(ASPEED_I2CD_INTR_RX_DONE,
bus->base + ASPEED_I2C_INTR_STS_REG);
+ readl(bus->base + ASPEED_I2C_INTR_STS_REG);
+ }
spin_unlock(&bus->lock);
return irq_remaining ? IRQ_NONE : IRQ_HANDLED;
}
--
2.17.1
next reply other threads:[~2020-04-29 3:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-29 3:37 ryan_chen [this message]
2020-04-29 7:53 ` [PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status clear race condition Wolfram Sang
2020-04-29 8:12 ` Ryan Chen
2020-04-29 9:03 ` Wolfram Sang
2020-04-30 10:55 ` Benjamin Herrenschmidt
2020-05-05 1:52 ` Ryan Chen
2020-04-30 10:52 ` Benjamin Herrenschmidt
2020-04-30 14:17 ` Wolfram Sang
2020-05-05 1:51 ` Ryan Chen
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