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iommu/rockchip: ignore isp mmu reset operation 

ISP mmu can't support reset operation, it won't get the
expected result when reset, but rest functions work normally.
Add this patch as a WA for this issue.

Signed-off-by: Simon Xue <xxm@rock-chips.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Simon Xue 2017-07-24 10:37:15 +08:00 committed by Joerg Roedel
parent 03f732f890
commit c3aa474249
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/rockchip-iommu.c
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@ -92,6 +92,7 @@ struct rk_iommu {
int num_mmu;
int *irq;
int num_irq;
bool reset_disabled;
struct iommu_device iommu;
struct list_head node; /* entry in rk_iommu_domain.iommus */
struct iommu_domain *domain; /* domain to which iommu is attached */
@ -415,6 +416,9 @@ static int rk_iommu_force_reset(struct rk_iommu *iommu)
int ret, i;
u32 dte_addr;
if (iommu->reset_disabled)
return 0;
/*
* Check if register DTE_ADDR is working by writing DTE_ADDR_DUMMY
* and verifying that upper 5 nybbles are read back.
@ -1180,6 +1184,9 @@ static int rk_iommu_probe(struct platform_device *pdev)
}
}
iommu->reset_disabled = device_property_read_bool(dev,
"rockchip,disable-mmu-reset");
err = iommu_device_sysfs_add(&iommu->iommu, dev, NULL, dev_name(dev));
if (err)
return err;