On 12/05/2013 05:25 AM, Hiroshi Doyu wrote: > SMMU used to depend on AHB bus. AHB driver needs to be populated and > AHB_XBAR_CTRL_SMMU_INIT_DONE bit needs to be set earliear than SMMU > being populated. Later Tegra SoC (>= T124) doesn't need AHB to enable > SMMU on AHB_XBAR_CTRL for AHB_XBAR_CTRL_SMMU_INIT_DONE any more. This > setting bit is now optional, depending on DT passing ahb phandle or > not.
This patch should happen after 1/3, and the "platform data" should indicate whether tegra_ahb_enable_smmu() needs to be called, so that on Tegra30... > diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c > @@ -1284,9 +1287,6 @@ static int tegra_smmu_probe(struct platform_device > *pdev) > smmu->ahb = of_parse_phandle(dev->of_node, "nvidia,ahb", 0); > - if (!smmu->ahb) > - return -ENODEV; ... that error-checking is still in place, yet on Tegra124, of_parse_phandle() isn't even called. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
