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iommu/dart: Initialize DART_STREAMS_ENABLE 

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@protonmail.com>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Reviewed-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20211019162253.45919-1-sven@svenpeter.dev
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sven Peter 2021-10-19 18:22:53 +02:00 committed by Joerg Roedel
parent 260aecd643
commit 5a009fc136
1 changed files with 5 additions and 0 deletions
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5
drivers/iommu/apple-dart.c
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@ -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);