Re: [PATCH] bus: mhi: host: Read PK HASH dynamically

[Manivannan Sadhasivam <mani@kernel.org>]

On Tue, Jan 30, 2024 at 09:05:06AM -0700, Jeffrey Hugo wrote:
> On 1/30/2024 1:21 AM, Manivannan Sadhasivam wrote:
> > On Fri, Dec 08, 2023 at 09:59:38AM -0700, Jeffrey Hugo wrote:
> > > The OEM PK HASH registers in the BHI region are read once during firmware
> > > load (boot), cached, and displayed on demand via sysfs. This has a few
> > > problems - if firmware load is skipped, the registers will not be read and
> > > if the register values change over the life of the device the local cache
> > > will be out of sync.
> > > 
> > > Qualcomm Cloud AI 100 can expose both these problems. It is possible for
> > > mhi_async_power_up() to be invoked while the device is in AMSS EE, which
> > > would bypass firmware loading. Also, Qualcomm Cloud AI 100 has 5 PK HASH
> > > slots which can be dynamically provisioned while the device is active,
> > > which would result in the values changing and users may want to know what
> > > keys are active.
> > > 
> > > Address these concerns by reading the PK HASH registers on-demand during
> > > the sysfs read. This will result in showing the most current information.
> > > 
> > > Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> > 
> > Applied to mhi-next!
> > 
> > - Mani
> 
> I hope you applied v2 since this is a reply to v1.  I don't see mhi-next
> with this change published yet, so I can't check.
> 

Sorry, I did apply v2.

- Mani

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