iommu/apple-dart: Clear stream error indicator bits for T8110 DARTs

[ Upstream commit ecf6508 ]

These registers exist and at least on the t602x variant the IRQ only
clears when theses are cleared.

Signed-off-by: Hector Martin <[email protected]>
Signed-off-by: Janne Grunau <[email protected]>
Reviewed-by: Sven Peter <[email protected]>
Reviewed-by: Neal Gompa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit aa98b4c1f84cee4a1dc962942921aa24187b48c3)
Signed-off-by: Wentao Guan <[email protected]>

Author: marcan

drivers/iommu/apple-dart.c

@@ -121,6 +121,8 @@
 #define DART_T8110_ERROR_ADDR_LO 0x170
 #define DART_T8110_ERROR_ADDR_HI 0x174
 
+#define DART_T8110_ERROR_STREAMS 0x1c0
+
 #define DART_T8110_PROTECT 0x200
 #define DART_T8110_UNPROTECT 0x204
 #define DART_T8110_PROTECT_LOCK 0x208
@@ -1041,6 +1043,9 @@ static irqreturn_t apple_dart_t8110_irq(int irq, void *dev)
 		error, stream_idx, error_code, fault_name, addr);
 
 	writel(error, dart->regs + DART_T8110_ERROR);
+	for (int i = 0; i < BITS_TO_U32(dart->num_streams); i++)
+		writel(U32_MAX, dart->regs + DART_T8110_ERROR_STREAMS + 4 * i);
+
 	return IRQ_HANDLED;
 }