diff options
Diffstat (limited to 'drivers/iommu/mtk_iommu.c')
| -rw-r--r-- | drivers/iommu/mtk_iommu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 7cbfe3bfaaab..eb43e7edb9dc 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -975,6 +975,13 @@ static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev) writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR); writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG); writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK, base + REG_MMU_PT_BASE_ADDR); + + /* + * Users may allocate dma buffer before they call pm_runtime_get, + * in which case it will lack the necessary tlb flush. + * Thus, make sure to update the tlb after each PM resume. + */ + mtk_iommu_tlb_flush_all(data); return 0; } |