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authorOmar Ramirez Luna <omar.luna@linaro.org>2012-11-19 19:05:49 -0600
committerJoerg Roedel <joro@8bytes.org>2012-12-03 18:48:01 +0100
commit87f8e57327bd8d85fb5b46cad29ac281430cc50d (patch)
treed1e3461eaf1e326adb83fde7afd85a710a258a3d /drivers/iommu/omap-iommu.c
parenta33977206cd167cb7541cf9044828552d9cae540 (diff)
downloadlinux-87f8e57327bd8d85fb5b46cad29ac281430cc50d.tar.gz
iommu/omap: Keep mmu enabled when requested
The purpose of the mmu is to handle the memory accesses requested by its users. Typically, the mmu is bundled with the processing unit in a single IP block, which makes them to share the same clock to be functional. Currently, iommu code assumes that its user will be indirectly clocking it, but being a separate mmu driver, it should handle its own clocks, so as long as the mmu is requested it will be powered ON and once detached it will be powered OFF. The remaining clock handling out of iommu_enable and iommu_disable corresponds to paths that can be accessed through debugfs, some of them doesn't work if the module is not enabled first, but in future if the mmu is idled withouth freeing, these are needed to debug. Signed-off-by: Omar Ramirez Luna <omar.luna@linaro.org> Tested-by: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu/omap-iommu.c')
-rw-r--r--drivers/iommu/omap-iommu.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 6b1288cddae..f8082da6179 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -154,7 +154,6 @@ static int iommu_enable(struct omap_iommu *obj)
err = arch_iommu->enable(obj);
- clk_disable(obj->clk);
return err;
}
@@ -163,8 +162,6 @@ static void iommu_disable(struct omap_iommu *obj)
if (!obj)
return;
- clk_enable(obj->clk);
-
arch_iommu->disable(obj);
clk_disable(obj->clk);