memory: tegra: Do not try to probe SMMU on Tegra20

Tegra20 doesn't have SMMU. Move out checking of the SMMU presence from
the SMMU driver into the Memory Controller driver. This change makes code
consistent in regards to how GART/SMMU presence checking is performed.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index e684e234361a..3545868c51c0 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -695,11 +695,13 @@ static int tegra_mc_probe(struct platform_device *pdev)
                 dev_err(&pdev->dev, "failed to register reset controller: %d\n",
                         err);
 
-        if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU)) {
+        if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU) && mc->soc->smmu) {
                 mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
-                if (IS_ERR(mc->smmu))
+                if (IS_ERR(mc->smmu)) {
                         dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
                                 PTR_ERR(mc->smmu));
+                        mc->smmu = NULL;
+                }
         }
 
         if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && !mc->soc->smmu) {