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Date:   Wed, 25 Sep 2019 17:42:56 +0200
From:   Joerg Roedel <joro@8bytes.org>
To:     Jiri Kosina <jikos@kernel.org>
Cc:     Kurt Garloff <kurt@garloff.de>,
        LKML <linux-kernel@vger.kernel.org>,
        Shah Nehal-Bakulchandra <Nehal-bakulchandra.Shah@amd.com>
Subject: Re: IOMMU vs Ryzen embedded EMMC controller
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On Wed, Sep 25, 2019 at 05:27:32PM +0200, Jiri Kosina wrote:
> On Sat, 21 Sep 2019, Kurt Garloff wrote:
> > [12916.740274] mmc0: sdhci: ============================================
> > [12916.740337] mmc0: error -5 whilst initialising MMC card
> 
> Do you have BAR memory allocation failures in dmesg with IOMMU on? 
> Actually, sharing both working and non-working dmesg, as well as 
> /proc/iomem contents, would be helpful.

Yes, can you please grab dmesg from a boot with iommu enabled and add
'amd_iommu_dump' to the kernel command line? That should give some hints
on what is going on.

Regards,

	Joerg