Re: [PATCH] arm64: dts: qcom: shikra: Add qcom,vmid to BAM-DMA node

On Tue, Aug 04, 2026 at 09:49:18PM +0530, Vishnu Santhosh wrote:
> 
> On 31-07-2026 02:49 am, Bjorn Andersson wrote:
> > On Tue, Jul 14, 2026 at 02:01:53PM +0530, Vishnu Santhosh wrote:
> > > On the Qualcomm Shikra SoC the mDSP (VMID 43 / QCOM_SCM_VMID_NAV) is
> > > the AXI master for BAM descriptor FIFO accesses. The XPU enforces
> > > per-region access control; without an SCM assignment granting NAV
> > > access, the first DMA transfer triggers an XPU violation.
> > > 
> > I'm a bit puzzled about your plan here.
> > 
> > You posted this on July 14th, that's 3 days after I asked you to rebase
> > patch [1]. This patch literally says that [1] is broken and untested.
> 
> The XPU violation itself wasn't visible against the base bam-dmux
> enablement alone. It only showed up once the access-control policy was
> enabled, which happened to land close to when [1] was posted upstream.
> That's why this series followed so soon after.
> 

Are you saying that none of the shikra patches were tested with
access-control enabled?!

Regards,
Bjorn