Commit 98604588b20db9e7174b03c5d1584e532a9380f2
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25b90cefc9
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smarc-ti-linux-3.14.y
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iommu/omap: add pdata ops for setting powerdomain constraint
Add a new platform data ops to allow the OMAP IOMMU driver to be able to request a specific target power domain state for the domain it belongs to. This ops is being added to resolve a boot issue on OMAP remote processors like IPU that have an AMMU/Unicache, which will be in an invalid state if the particular power domain enters RET between the MMU programming and releasing the reset of the remote processor. See [1] for more details on the issue. The ops will allow to invoke the pwrdm_set_next_pwrst() API in a multi-arch kernel environment. The ops also returns the current power domain state while enforcing the constraint so that the driver can store it and use it to set back the power domain state while releasing the constraint. [1] http://git.ti.com/gitweb/?p=rpmsg/rpmsg.git;a=commit;h=6d6dd44c55638d54a151bf2ae6cc77b2f4e459d0 Signed-off-by: Suman Anna <s-anna@ti.com>
Showing 1 changed file with 2 additions and 0 deletions Side-by-side Diff
include/linux/platform_data/iommu-omap.h
... | ... | @@ -53,5 +53,7 @@ |
53 | 53 | int (*deassert_reset)(struct platform_device *pdev, const char *name); |
54 | 54 | int (*device_enable)(struct platform_device *pdev); |
55 | 55 | int (*device_idle)(struct platform_device *pdev); |
56 | + int (*set_pwrdm_constraint)(struct platform_device *pdev, bool request, | |
57 | + u8 *pwrst); | |
56 | 58 | }; |