target/linux/d1/patches-6.1/0051-iommu-sun50i-Ensure-bypass-is-disabled.patch

   1 From 384e2ca3c049fe36f4e679fc76fcc8dfdc9297f9 Mon Sep 17 00:00:00 2001
   2 From: Samuel Holland <samuel@sholland.org>
   3 Date: Wed, 27 Apr 2022 19:06:28 -0500
   4 Subject: [PATCH 051/117] iommu/sun50i: Ensure bypass is disabled
   5
   6 The H6 variant of the hardware disables bypass by default. The D1
   7 variant of the hardware enables bypass for all masters by default.
   8
   9 Since the driver expects bypass to be disabled, ensure that is the case.
  10
  11 Signed-off-by: Samuel Holland <samuel@sholland.org>
  12 ---
  13  drivers/iommu/sun50i-iommu.c | 2 ++
  14  1 file changed, 2 insertions(+)
  15
  16 --- a/drivers/iommu/sun50i-iommu.c
  17 +++ b/drivers/iommu/sun50i-iommu.c
  18 @@ -445,6 +445,8 @@ static int sun50i_iommu_enable(struct su
  19
  20         spin_lock_irqsave(&iommu->iommu_lock, flags);
  21
  22 +       iommu_write(iommu, IOMMU_BYPASS_REG, 0);
  23 +
  24         iommu_write(iommu, IOMMU_TTB_REG, sun50i_domain->dt_dma);
  25         iommu_write(iommu, IOMMU_TLB_PREFETCH_REG,
  26                     IOMMU_TLB_PREFETCH_MASTER_ENABLE(0) |