Messages in this thread | | | Subject | Re: [PATCH v2 5/5] iommu/mediatek: Always tlb_flush_all when each PM resume | From | AngeloGioacchino Del Regno <> | Date | Mon, 10 Jan 2022 12:44:32 +0100 |
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Il 08/12/21 13:07, Dafna Hirschfeld ha scritto: > From: Yong Wu <yong.wu@mediatek.com> > > Prepare for 2 HWs that sharing pgtable in different power-domains. > > When there are 2 M4U HWs, it may has problem in the flush_range in which > we get the pm_status via the m4u dev, BUT that function don't reflect the > real power-domain status of the HW since there may be other HW also use > that power-domain. > > DAM allocation is often done while the allocating device is runtime > suspended. In such a case the iommu will also be suspended and partial > flushing of the tlb will not be executed. > Therefore, we add a tlb_flush_all in the pm_runtime_resume to make > sure the tlb is always clean. > > In other case, the iommu's power should be active via device > link with smi. > > Signed-off-by: Yong Wu <yong.wu@mediatek.com> > [move the call to mtk_iommu_tlb_flush_all to the bottom of resume cb, improve doc/log] > Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
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