回复: [EXT] Re: [PATCH v3 02/17] firmware: scmi: smt: Interrupt communication enable

[Alice Guo (OSS)]

> On 1/3/25 7:45 AM, Alice Guo wrote:
> > From: Viorel Suman <viorel.suman at nxp.com>
> >
> > When interrupt driven communication is supported
> 
> U-Boot does not use interrupts.
> 
> > , the transport allows
> > the caller to choose between interrupt and polling driven
> > communications. To make the choice, the channel flags are used. i.MX95
> > uses interrupt driven communication so that Channel flags should be
> > set to 1.
> 
> How does this work in U-Boot, which does not use interrupts ?

Hi Marek,

The clearer explanation will be added in the commit log.

This is based on Arm® System Control and Management Interface Platform Design Document Version 3.2 (Document number: DEN0056E) 5.1.2. When Bit[0] of Channel flags is 1, the System Manager runs on M core will trigger general-purpose interrupts to A core. U-Boot polls General-purpose Status (GSR) until GIPn is set.

> > +     /* Command should complete via an interrupt so that set Channel flags
> to 1. */
> > +     if (IS_ENABLED(CONFIG_IMX95))
> > +             scmi_smt_enable_intr(smt, true);
> This SoC specific stuff shouldn't be in generic code.
> 
> Can this be moved elsewhere ?

Will change it in v4.

Best Regards,
Alice Guo