[PATCH v4 20/23] iommu/tegra241-cmdqv: Simplify deinit flow in tegra241_cmdqv_remove_vintf()

Nicolin Chen
2025-05-09T03:04:03Z

The current flow of tegra241_cmdqv_remove_vintf() is:
1. For each LVCMDQ, tegra241_vintf_remove_lvcmdq():
a. Disable the LVCMDQ HW
b. Release the LVCMDQ SW resource
2. For current VINTF, tegra241_vintf_hw_deinit():
c. Disable all LVCMDQ HWs
d. Disable VINTF HW

Obviously, the step 1.a and the step 2.c are redundant.

Since tegra241_vintf_hw_deinit() disables all of its LVCMDQ HWs, it could
simplify the flow in tegra241_cmdqv_remove_vintf() by calling that first:
1. For current VINTF, tegra241_vintf_hw_deinit():
a. Disable all LVCMDQ HWs
b. Disable VINTF HW
2. Release all LVCMDQ SW resources

Drop tegra241_vintf_remove_lvcmdq(), and move tegra241_vintf_free_lvcmdq()
as the new step 2.

Acked-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
index ba029f7d24ce..8d418c131b1b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
+++ b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
@@ -628,24 +628,17 @@ static int tegra241_cmdqv_init_vintf(struct tegra241_cmdqv *cmdqv, u16 max_idx,

/* Remove Helpers */

-static void tegra241_vintf_remove_lvcmdq(struct tegra241_vintf *vintf, u16 lidx)
-{
- tegra241_vcmdq_hw_deinit(vintf->lvcmdqs[lidx]);
- tegra241_vintf_free_lvcmdq(vintf, lidx);
-}
-
static void tegra241_cmdqv_remove_vintf(struct tegra241_cmdqv *cmdqv, u16 idx)
{
struct tegra241_vintf *vintf = cmdqv->vintfs[idx];
u16 lidx;

+ tegra241_vintf_hw_deinit(vintf);
+
/* Remove LVCMDQ resources */
for (lidx = 0; lidx < vintf->cmdqv->num_lvcmdqs_per_vintf; lidx++)
if (vintf->lvcmdqs[lidx])
- tegra241_vintf_remove_lvcmdq(vintf, lidx);
-
- /* Remove VINTF resources */
- tegra241_vintf_hw_deinit(vintf);
+ tegra241_vintf_free_lvcmdq(vintf, lidx);

dev_dbg(cmdqv->dev, "VINTF%u: deallocated\n", vintf->idx);
tegra241_cmdqv_deinit_vintf(cmdqv, idx);
--
2.43.0