diff options
| author | Prakash Gupta <guptap@codeaurora.org> | 2017-05-16 12:13:02 +0530 |
|---|---|---|
| committer | Prakash Gupta <guptap@codeaurora.org> | 2017-06-05 10:42:56 +0530 |
| commit | 65f095ea8ff1d62f93a13a2c65fefd985a9951cb (patch) | |
| tree | b05269aa960ee369067e98c62b9667db660be47c /drivers | |
| parent | a62f42964d5606a6ef123f4608f6cb5241598c25 (diff) | |
iommu/arm-smmu: Add support for regulator deferred disable
In case of unmap call, regulator is enabled/disabled. This may introduce
additional delay. For clients who do not detach, it's not possible to keep
regulator vote while smmu is attached.
Add support for regulator deferred disable. The time delay for deferred
disable can be set using dt property qcom,deferred-regulator-disable-delay
in ms.
Change-Id: I462e1999bd81f6332169b24749632d7b247c75c5
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 065379c1397f..f14812fdee6c 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -404,6 +404,7 @@ struct arm_smmu_device { struct msm_bus_scale_pdata *bus_pdata; enum tz_smmu_device_id sec_id; + int regulator_defer; }; struct arm_smmu_cfg { @@ -950,7 +951,8 @@ static int arm_smmu_disable_regulators(struct arm_smmu_device *smmu) arm_smmu_unprepare_clocks(smmu); arm_smmu_unrequest_bus(smmu); if (smmu->gdsc) { - ret = regulator_disable(smmu->gdsc); + ret = regulator_disable_deferred(smmu->gdsc, + smmu->regulator_defer); WARN(ret, "%s: Regulator disable failed\n", dev_name(smmu->dev)); } @@ -3610,6 +3612,12 @@ static int arm_smmu_init_regulators(struct arm_smmu_device *smmu) if (!of_get_property(dev->of_node, "vdd-supply", NULL)) return 0; + if (!of_property_read_u32(dev->of_node, + "qcom,deferred-regulator-disable-delay", + &(smmu->regulator_defer))) + dev_info(dev, "regulator defer delay %d\n", + smmu->regulator_defer); + smmu->gdsc = devm_regulator_get(dev, "vdd"); if (IS_ERR(smmu->gdsc)) return PTR_ERR(smmu->gdsc); |