On Wed, Nov 20, 2024 at 08:51:12AM +0100, Arkadiusz Kubalewski wrote:
> Mask admin command returned max phase adjust value for both input and
> output pins. Only 31 bits are relevant, last released data sheet wrongly
> points that 32 bits are valid - see [1] 3.2.6.4.1 Get CCU Capabilities
> Command for reference. Fix of the datasheet itself is in progress.
>
> Fix the min/max assignment logic, previously the value was wrongly
> considered as negative value due to most significant bit being set.
Thanks Arkadiusz,
I understand the most-significant-bit issue and see that is addressed
through the use of ICE_AQC_GET_CGU_MAX_PHASE_ADJ. I also agree that this is
a fix.
But, although I like simplification afforded ice_dpll_phase_range_set()
I'm not convinced it is a part of the fix. Does the code behave correctly
without those changes? If so, I'm wondering if that part should be broken
out into a separate follow-up patch for iwl.
>
> Example of previous broken behavior:
> $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/dpll.yaml \
> --do pin-get --json '{"id":1}'| grep phase-adjust
> 'phase-adjust': 0,
> 'phase-adjust-max': 16723,
> 'phase-adjust-min': -16723,
I'm curious to know if the values for max and min above are inverted.
I.e. if, sude to the most-significant-bit issue they are:
'phase-adjust-max': -16723,
'phase-adjust-min': 16723,
>
> Correct behavior with the fix:
> $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/dpll.yaml \
> --do pin-get --json '{"id":1}'| grep phase-adjust
> 'phase-adjust': 0,
> 'phase-adjust-max': 2147466925,
> 'phase-adjust-min': -2147466925,
>
> [1] https://cdrdv2.intel.com/v1/dl/getContent/613875?explicitVersion=true
>
> Fixes: 90e1c90750d7 ("ice: dpll: implement phase related callbacks")
> Reviewed-by: Przemek Kitszel <[email protected]>
> Signed-off-by: Arkadiusz Kubalewski <[email protected]>
...
