linux-kernel - [PATCH AUTOSEL 5.15 79/82] iommu/dart: Initialize DART_STREAMS

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Message-Id: <20211109221641.1233217-79-sashal@kernel.org>
Date:   Tue,  9 Nov 2021 17:16:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sven Peter <sven@...npeter.dev>,
        Martin Povišer <povik@...tonmail.com>,
        Hector Martin <marcan@...can.st>,
        Joerg Roedel <jroedel@...e.de>,
        Sasha Levin <sashal@...nel.org>, joro@...tes.org,
        iommu@...ts.linux-foundation.org
Subject: [PATCH AUTOSEL 5.15 79/82] iommu/dart: Initialize DART_STREAMS_ENABLE

From: Sven Peter <sven@...npeter.dev>

[ Upstream commit 5a009fc1364170b240a4d351b345e69bb3728b3e ]

DART has an additional global register to control which streams are
isolated. This register is a bit redundant since DART_TCR can already
be used to control isolation and is usually initialized to DART_STREAM_ALL
by the time we get control. Some DARTs (namely the one used for the audio
controller) however have some streams disabled initially. Make sure those
work by initializing DART_STREAMS_ENABLE during reset.

Reported-by: Martin Povišer <povik@...tonmail.com>
Signed-off-by: Sven Peter <sven@...npeter.dev>
Reviewed-by: Hector Martin <marcan@...can.st>
Link: https://lore.kernel.org/r/20211019162253.45919-1-sven@svenpeter.dev
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/apple-dart.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index fdfa39ec2a4d4..ad69eeb5ac5ba 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -70,6 +70,8 @@
 #define DART_ERROR_ADDR_HI 0x54
 #define DART_ERROR_ADDR_LO 0x50
 
+#define DART_STREAMS_ENABLE 0xfc
+
 #define DART_TCR(sid) (0x100 + 4 * (sid))
 #define DART_TCR_TRANSLATE_ENABLE BIT(7)
 #define DART_TCR_BYPASS0_ENABLE BIT(8)
@@ -301,6 +303,9 @@ static int apple_dart_hw_reset(struct apple_dart *dart)
 	apple_dart_hw_disable_dma(&stream_map);
 	apple_dart_hw_clear_all_ttbrs(&stream_map);
 
+	/* enable all streams globally since TCR is used to control isolation */
+	writel(DART_STREAM_ALL, dart->regs + DART_STREAMS_ENABLE);
+
 	/* clear any pending errors before the interrupt is unmasked */
 	writel(readl(dart->regs + DART_ERROR), dart->regs + DART_ERROR);
 
-- 
2.33.0