Re: [PATCH v6 3/4] regulator: qcom-rpmh: readback voltage/bypass/mode set during bootup

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 8/1/26 10:00 AM, Kamal Wadhwa wrote:
> Currently, during regulator registration, regulator framework sends an
> unnecessary `min-microvolts` request for the rpmh-regulator device. This
> happens because in current design, we do not have a way to readback the
> voltage settings that was set during the bootloader stage.
> 
> Fix this by using the rpmh_read() API to read the regulator voltage
> settings done during boot and make it available to regulator framework
> from the very first read after the bootup.
> 
> Also use this API to read the mode/bypass settings as well. This will
> provide the regulator framework a sense of the initial settings done by
> bootloader and thus preventing any redundant writes for any setting post
> bootup incase the same setting was already applied during bootup.
> 
> Signed-off-by: Kamal Wadhwa <kamal.wadhwa@oss.qualcomm.com>
> ---

SC8180X Primus hangs with this patch applied and so does SM8150 HDK.

Interestingly, SDM845 DB845c doesn't

I think we may need to opt some platforms out of this..

Konrad