diff options
| author | Sven Peter <sven@svenpeter.dev> | 2021-10-19 18:22:53 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-10-27 10:08:17 +0200 |
| commit | 5a009fc1364170b240a4d351b345e69bb3728b3e (patch) | |
| tree | d93938cfd52380031fc517f08e010ac625a3cf13 | |
| parent | 260aecd643fc129c1771cefdd2aaaedf0485fa59 (diff) | |
| download | linux-5a009fc1364170b240a4d351b345e69bb3728b3e.tar.gz | |
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 PoviĊĦer <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>
| -rw-r--r-- | drivers/iommu/apple-dart.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 13ba258b7413..f0f4d1f74f92 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); |