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Date:   Sun, 10 Jan 2021 13:00:19 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     WGH <wgh@torlan.ru>
Cc:     Yazen Ghannam <yazen.ghannam@amd.com>, linux-edac@vger.kernel.org
Subject: Re: Unable to set (or read back) sdram_scrub_rate on amd64_edac
 F17h_M70h (Ryzen 3rd gen)
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On Sun, Jan 10, 2021 at 02:46:52PM +0300, WGH wrote:
> > # setpci -s 00:18.6 0x0x48.l
> % sudo setpci  -s 00:18.6 0x48.l
> b214bac4
> % sudo setpci  -s 00:18.6 0x48.l
> b23225c4
> % sudo setpci  -s 00:18.6 0x48.l
> b2648984
> % sudo setpci  -s 00:18.6 0x48.l
> b27b9dc4
> % sudo setpci  -s 00:18.6 0x48.l
> b293f504
> 
> Whatever that means.

Yah, bit 0 is not set so you're getting scrubrate 0 returned.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette