Re: [PATCH v2 1/1] drm/tyr: make SRAM supply optional like panthor

[Onur Özkan]

On Thu, 12 Feb 2026 11:34:41 +0000
Mark Brown <broonie@xxxxxxxxxx> wrote:

> On Thu, Feb 12, 2026 at 01:05:38PM +0300, Onur Özkan wrote:
> > On rk3588s, `dmesg | grep 'tyr'` logs:
> > 
> >   tyr fb000000.gpu: supply SRAM not found, using dummy regulator
> > 
> > This happens because Tyr calls Regulator<Enabled>::get() for SRAM,
> > which goes through the non-optional regulator_get() path. If the
> > device tree doesn't provide sram-supply, regulator core falls back
> > to a dummy regulator and writes that log.
> 
> > Panthor handles SRAM as optional and tolerates missing sram-supply.
> 
> Does the RAM really work without power?

If the platform has no separate sram-supply (meaning that rail is
coupled to mali), RAM should still be powered and work fine. Panthor
already relies on this model by treating sram-supply as optional and
as far as I can see there are no RAM issues on Panthor.

- Onur