Re: [PATCH v3 2/2] interconnect: qcom: add MSM8x60 NoC driver

[Konrad Dybcio]

On 6/6/26 2:34 PM, Herman van Hazendonk wrote:
> Add a Qualcomm interconnect driver for the MSM8x60 family modelling the
> four NoC fabrics (APPSS, System, MMSS, Daytona) that connect masters
> and slaves on these Scorpion-class SoCs.  The driver implements the
> interconnect-provider API to manage bandwidth between specific masters
> and slaves via the RPM arbitration tables.

[...]


> +/*
> + * Minimum fabric clock rate to prevent bus starvation.
> + *
> + * When no consumers request bandwidth, the rate calculation yields 0,
> + * causing fabric clocks to drop to minimum. This creates bimodal
> + * performance: fast when other subsystems (like display) happen to
> + * request bandwidth, slow otherwise.
> + *
> + * 384 MHz keeps fabric fast during concurrent MDP display scanout
> + * and USB gadget traffic. legacy vendor kernel docs: "AXI bus frequency needs to be
> + * kept at maximum value while USB data transfers are happening."
> + * 266 MHz was insufficient - USB crashed during display activity.
> + */
> +#define MSM8660_FABRIC_MIN_RATE		384000000UL	/* 384 MHz */

Can you ensure that through a vote in the USB driver?

Konrad