Re: [PATCH v2 18/20] mips: csrc-r4k: Decrease r4k-clocksource rating if CPU_FREQ enabled

Thomas Bogendoerfer
2020-05-18T16:32:23Z

On Mon, May 18, 2020 at 04:48:20PM +0300, Serge Semin wrote:
> On Fri, May 15, 2020 at 11:06:47PM +0200, Thomas Bogendoerfer wrote:
> > On Fri, May 15, 2020 at 10:48:27AM +0300, Serge Semin wrote:
> > > Thomas,
> > > Could you take a look at my comment below so I could proceed with the
> > > patchset v3 development?
> >
> > I can't help, but using r4k clocksource with changing frequency is
> > probaly only usefull as a random generator. So IMHO the only two
> > options are disabling it or implement what arch/x86/kernel/tsc.c does.
> >
> > Thomas.
>
> Thomas, could you proceed with the rest of the patches review?
> ├─>[PATCH v2 16/20] bus: cdmm: Add MIPS R5 arch support
> ├─>[PATCH v2 15/20] mips: cdmm: Add mti,mips-cdmm dtb node support

both are not my call, but look ok to me.

> ├─>[PATCH v2 13/20] mips: early_printk_8250: Use offset-sized IO-mem accessors

that's broken. A reg shift of 2 doesn't mean we could use 32bit access
to the registers on other platforms. As I don't think adding some ifdefery
makes things nicer, just implement the your prom_putchar in board code.

> ├─>[PATCH v2 12/20] mips: MAAR: Add XPA mode support

looks ok so far.

> ├─>[PATCH v2 10/20] mips: Add CONFIG/CONFIG6/Cause reg fields macro

that is fine

> └─>[PATCH v2 09/20] mips: Add CP0 Write Merge config support

this is IMHO a dangerous change. Enabling write merging for any
CPU supporting it might triggers bugs. Do it in your board bringup
code and at the moment I don't see a reason for the rest of that
patch.

Thomas.

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