Re: [PATCH v2 2/5] iommu/arm-smmu: Emulate bypass by using context banks

2020-07-20 Thread Jordan Crouse
On Mon, Jul 20, 2020 at 09:58:42AM +0100, Will Deacon wrote: > On Thu, Jul 16, 2020 at 05:16:16PM -0700, Bjorn Andersson wrote: > > Some firmware found on various Qualcomm platforms traps writes to S2CR > > of type BYPASS and writes FAULT into the register. This prevents us from > > marking the str

Re: [PATCH v2 2/5] iommu/arm-smmu: Emulate bypass by using context banks

2020-07-20 Thread Will Deacon
On Thu, Jul 16, 2020 at 05:16:16PM -0700, Bjorn Andersson wrote: > Some firmware found on various Qualcomm platforms traps writes to S2CR > of type BYPASS and writes FAULT into the register. This prevents us from > marking the streams for the display controller as BYPASS to allow > continued scanou

[PATCH v2 2/5] iommu/arm-smmu: Emulate bypass by using context banks

2020-07-16 Thread Bjorn Andersson
Some firmware found on various Qualcomm platforms traps writes to S2CR of type BYPASS and writes FAULT into the register. This prevents us from marking the streams for the display controller as BYPASS to allow continued scanout of the screen through the initialization of the ARM SMMU. This adds a