| Message ID | 20230128111114.4049-3-sven@svenpeter.dev |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Apple M1 USB4/Thunderbolt DART support | expand |
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 42666617803d..7d8b2b90cdb6 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -182,6 +182,8 @@ struct apple_dart_hw { u64 ttbr_addr_field_shift; u64 ttbr_shift; int ttbr_count; + + bool disable_bypass; }; /* @@ -1075,6 +1077,9 @@ static int apple_dart_probe(struct platform_device *pdev) dart->pgsize = 1 << FIELD_GET(DART_PARAMS1_PAGE_SHIFT, dart_params[0]); dart->supports_bypass = dart_params[1] & DART_PARAMS2_BYPASS_SUPPORT; + if (dart->hw->disable_bypass) + dart->supports_bypass = 0; + switch (dart->hw->type) { case DART_T8020: case DART_T6000:
The USB4 PCIe DARTs claim to support bypass but we never want to allow that on externally facing ports. Signed-off-by: Sven Peter <sven@svenpeter.dev> --- drivers/iommu/apple-dart.c | 5 +++++ 1 file changed, 5 insertions(+)