[PATCH v6 04/10] iommu/tegra241-cmdqv: Restore PROD and CONS after resume

Pranjal Shrivastava
2026-04-14T19:47:22Z

From: Ashish Mhetre <amhetre@nvidia.com>

PROD and CONS indices for vcmdqs are getting set to 0 after resume.
Because of this the vcmdq is not consuming commands after resume.
Fix this by restoring PROD and CONS indices after resume from
saved pointers.

Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Signed-off-by: Pranjal Shrivastava <praan@google.com>
---
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
index b3ed2149f72b..eff6b7f6d52e 100644
--- a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
+++ b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
@@ -511,6 +511,8 @@ static int tegra241_vcmdq_hw_init(struct tegra241_vcmdq *vcmdq)

/* Configure and enable VCMDQ */
writeq_relaxed(vcmdq->cmdq.q.q_base, REG_VCMDQ_PAGE1(vcmdq, BASE));
+ writel_relaxed(vcmdq->cmdq.q.llq.prod, REG_VCMDQ_PAGE0(vcmdq, PROD));
+ writel_relaxed(vcmdq->cmdq.q.llq.cons, REG_VCMDQ_PAGE0(vcmdq, CONS));

ret = vcmdq_write_config(vcmdq, VCMDQ_EN);
if (ret) {
--
2.54.0.rc0.605.g598a273b03-goog