Re: [PATCH v2] arm64: dts: qcom: sdm845: Add cpu OPP tables

[Bjorn Andersson]

On Wed 08 Jul 19:22 PDT 2020, Steev Klimaszewski wrote:

> 
> On 7/2/20 3:46 PM, Sibi Sankar wrote:
> > Add OPP tables required to scale DDR/L3 per freq-domain on SDM845 SoCs.
> >
> > Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
> > ---
> 
> 
> Hi Sibi,
> 
> 
> Bjorn asked me to give this patch a whirl, and I have to say, I like it
> but I'm not sure if I'm missing a dependency somewhere...
> 
> 
> In 5.8.0-rc4, I'm seeing a couple probe defers
> 
> [    0.131341] cpu cpu0: _allocate_opp_table: Error finding interconnect
> paths: -517
> 
> [    0.132694] cpu cpu4: _allocate_opp_table: Error finding interconnect
> paths: -517
> 
> And then a bit later on,
> 
> [    0.625837] cpu cpu0: failed to get clock: -2
> 
> 
> If these aren't anything to worry about, you can throw my Tested-by on
> 
> Tested-by: Steev Klimaszewski <steev@xxxxxxxx>
> 

You need to enable:
CONFIG_INTERCONNECT=y
CONFIG_INTERCONNECT_QCOM=y
CONFIG_INTERCONNECT_QCOM_OSM_L3=m
CONFIG_INTERCONNECT_QCOM_SDM845=m

With this I can see the interconnect_summary in debugfs change with the
CPU frequency.

Regards,
Bjorn