Re: [PATCH 3/3] arm64: Add KRYO4XX silver CPU cores to erratum list 1530923 and 1024718

On Fri, Jul 03, 2020 at 08:04:04PM +0530, Sai Prakash Ranjan wrote:

On 2020-07-03 19:25, Will Deacon wrote:

quoted

On Tue, Jun 30, 2020 at 11:30:55PM +0530, Sai Prakash Ranjan wrote:

quoted

KRYO4XX silver/LITTLE CPU cores with revision r1p0 are affected by
erratum 1530923 and 1024718, so add them to the respective list.
The variant and revision bits are implementation defined and are
different from the their Cortex CPU counterparts on which they are
based on, i.e., r1p0 is equivalent to rdpe.

So just to confirm, revisions prior to rdpe are unaffected, or do those
parts simply not exist?

There is one revision prior to this r0p1(r7pc) which has a different part
number and are used in v1 of SoCs which are limited to only internal test
platforms in the early stages of bringup and not used in actual devices out
there, so I did not add it to the list but they are affected. Plus we would
need to add another MIDR_QCOM_KRYO_4XX_SILVER_V1 if we are supporting them
which I thought was not worth it when devices with those CPUs are not
available.

Thanks, just wanted to make sure. Sounds like we can safely assume those
parts don't exist.

Will

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