Re: [PATCH v2 11/29] iommu/mediatek: Always pm_runtime_get while tlb flush
From: Hsin-Yi Wang <hidden>
Date: 2021-08-24 07:10:42
Also in:
linux-devicetree, linux-iommu, linux-mediatek, lkml
On Fri, Aug 13, 2021 at 2:57 PM Yong Wu [off-list ref] wrote:
Prepare for 2 HWs that sharing pgtable in different power-domains. The previous SoC don't have PM. Only mt8192 has power-domain, and it is display's power-domain which nearly always is enabled. When there are 2 M4U HWs, it may has problem. In this function, we get the pm_status via the m4u dev, but it don't reflect the real power-domain status of the HW since there may be other HW also use that power-domain. Currently we could not get the real power-domain status, thus always pm_runtime_get here. Prepare for mt8195, thus, no need fix tags here. This patch may drop the performance, we expect the user could pm_runtime_get_sync before dma_alloc_attrs which need tlb ops.
Can you check if there are existing users that need to add this change?
Signed-off-by: Yong Wu <yong.wu@mediatek.com> ---
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