Re: [PATCH 6/9] interconnect: qcom: let platforms declare their bugginess

[Brian Masney]

On Mon, Mar 23, 2026 at 03:17:22AM +0200, Dmitry Baryshkov wrote:
> On MSM8974 programming some of the RPM resources results in the
> "resource does not exist" messages from the firmware. This occurs even
> with the downstream bus driver, which happily ignores the errors. My
> assumption is that these resources existed in the earlier firmware
> revisions but were later switched to be programmed differently (for the
> later platforms corresponding nodes use qos.ap_owned, which prevents
> those resources from being programmed.
> 
> In preparation for conversion of the MSM8974 driver (which doesn't have
> QoS code yet) to the main icc-rpm set of helpers, let the driver declare
> that those -ENXIO errors must be ignored (for now). Later, when the QoS
> programming is sorted out (and more interconnects are added to the DT),
> this quirk might be removed.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>

Reviewed-by: Brian Masney <bmasney@xxxxxxxxxx>

When I wrote the msm8974 icc driver, I spent a fair bit of time trying
to make it so that we didn't have to ignore those errors. As you
mentioned, the downstream msm bus code gives the same errors. That
downstream code was the only reference material that I had access to
when I wrote this driver.