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FAILED: patch "[PATCH] i2c: aspeed: Avoid i2c interrupt status clear race condition." failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message May 4, 2020

Subsystems (4)
Stable branch I2C subsystem host drivers Arm/Aspeed machine support Arm/Aspeed I2C driver
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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From c926c87b8e36dcc0ea5c2a0a0227ed4f32d0516a Mon Sep 17 00:00:00 2001
From: ryan_chen <[email protected]>
Date: Wed, 29 Apr 2020 11:37:37 +0800
Subject: [PATCH] i2c: aspeed: Avoid i2c interrupt status clear race condition.

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.

Fixes f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C")
Signed-off-by ryan_chen <[email protected]>
Acked-by Benjamin Herrenschmidt <[email protected]>
[wsa: added Fixes tag]
Signed-off-by Wolfram Sang <[email protected]>
drivers/i2c/busses/i2c-aspeed.c +4 -1
index 07c1993274c5..f51702d86a90 100644
@@ -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;
 }