diff options
Diffstat (limited to 'xen/drivers/passthrough/amd/iommu_map.c')
| -rw-r--r-- | xen/drivers/passthrough/amd/iommu_map.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/xen/drivers/passthrough/amd/iommu_map.c b/xen/drivers/passthrough/amd/iommu_map.c index a65e01ac1f..ea1f2733ce 100644 --- a/xen/drivers/passthrough/amd/iommu_map.c +++ b/xen/drivers/passthrough/amd/iommu_map.c @@ -131,11 +131,9 @@ void flush_command_buffer(struct amd_iommu *iommu) u32 cmd[4], status; int loop_count, comp_wait; - /* clear 'ComWaitInt' in status register (WIC) */ - set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, 0, - IOMMU_STATUS_COMP_WAIT_INT_MASK, - IOMMU_STATUS_COMP_WAIT_INT_SHIFT, &status); - writel(status, iommu->mmio_base + IOMMU_STATUS_MMIO_OFFSET); + /* RW1C 'ComWaitInt' in status register */ + writel(IOMMU_STATUS_COMP_WAIT_INT_MASK, + iommu->mmio_base + IOMMU_STATUS_MMIO_OFFSET); /* send an empty COMPLETION_WAIT command to flush command buffer */ cmd[3] = cmd[2] = 0; @@ -159,9 +157,9 @@ void flush_command_buffer(struct amd_iommu *iommu) if ( comp_wait ) { - /* clear 'ComWaitInt' in status register (WIC) */ - status &= IOMMU_STATUS_COMP_WAIT_INT_MASK; - writel(status, iommu->mmio_base + IOMMU_STATUS_MMIO_OFFSET); + /* RW1C 'ComWaitInt' in status register */ + writel(IOMMU_STATUS_COMP_WAIT_INT_MASK, + iommu->mmio_base + IOMMU_STATUS_MMIO_OFFSET); return; } AMD_IOMMU_DEBUG("Warning: ComWaitInt bit did not assert!\n"); |