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iommu/arm-smmu: Reorganize code to allow no gdsc

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Some SMMUs may not have a dedicated gdsc for it.
Allow for the enable code to prepare clocks and vote
for bus requests even if there is no gdsc provided.

Change-Id: Iaedfb73d8ae7f12895472893468e5c32d2bf2462
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
This commit is contained in:
Rohit Vaswani 2015-08-28 15:33:14 -07:00 • committed by David Keitel
parent 6408533e2a
commit 25e3f17849
1 changed files with 18 additions and 17 deletions
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35
drivers/iommu/arm-smmu.c
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@ -751,11 +751,10 @@ static int arm_smmu_unrequest_bus(struct arm_smmu_device *smmu)
static int arm_smmu_disable_regulators(struct arm_smmu_device *smmu)
{
if (!smmu->gdsc)
return 0;
arm_smmu_unprepare_clocks(smmu);
arm_smmu_unrequest_bus(smmu);
if (!smmu->gdsc)
return 0;
return regulator_disable(smmu->gdsc);
}
@ -763,25 +762,27 @@ static int arm_smmu_enable_regulators(struct arm_smmu_device *smmu)
{
int ret;
if (!smmu->gdsc)
return 0;
ret = regulator_enable(smmu->gdsc);
if (ret)
return ret;
if (smmu->gdsc) {
ret = regulator_enable(smmu->gdsc);
if (ret)
goto out;
}
ret = arm_smmu_request_bus(smmu);
if (ret) {
regulator_disable(smmu->gdsc);
goto out;
}
if (ret)
goto out_reg;
ret = arm_smmu_prepare_clocks(smmu);
if (ret) {
arm_smmu_unrequest_bus(smmu);
regulator_disable(smmu->gdsc);
}
if (ret)
goto out_bus;
return ret;
out_bus:
arm_smmu_unrequest_bus(smmu);
out_reg:
if (smmu->gdsc)
regulator_disable(smmu->gdsc);
out:
return ret;
}