Re: [PATCH V3 0/8] ARM: Add minimal Raspberry Pi 4 support

From: Nicolas Saenz Julienne <nsaenzjulienne@suse•de>
To: Stefan Wahren <wahrenst@gmx•net>,
	Rob Herring <robh+dt@kernel•org>,
	Mark Rutland <mark.rutland@arm•com>,
	Eric Anholt <eric@anholt•net>,
	Florian Fainelli <f.fainelli@gmail•com>,
	Ray Jui <rjui@broadcom•com>,
	Scott Branden <sbranden@broadcom•com>,
	Matthias Brugger <mbrugger@suse•com>,
	Guillaume Gardet <Guillaume.Gardet@arm•com>,
	Adrian Hunter <adrian.hunter@intel•com>
Cc: devicetree@vger•kernel.org,
	bcm-kernel-feedback-list@broadcom•com,
	linux-arm-kernel@lists•infradead.org,
	Will Deacon <will@kernel•org>,
	Catalin Marinas <catalin.marinas@arm•com>
Subject: Re: [PATCH V3 0/8] ARM: Add minimal Raspberry Pi 4 support
Date: Thu, 03 Oct 2019 19:09:30 +0200	[thread overview]
Message-ID: <3853cd8425743b4991f5d599ec1c0fbbf4232f95.camel@suse.de> (raw)
In-Reply-To: <1569672435-19823-1-git-send-email-wahrenst@gmx.net>

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On Sat, 2019-09-28 at 14:07 +0200, Stefan Wahren wrote:
> This series adds minimal support for the new Raspberry Pi 4, so we are able
> to login via debug UART.
> 
> Patch 1-2:   Fix some DT schema warnings
> Patch 3-4:   Prepare DTS for the new SoC BMC2711
> Patch 5-7:   Add Raspberry Pi 4 DTS support
> Patch 8:     Update MAINTAINERS
> 
> Unfortunately the Raspberry Pi Foundation didn't released a
> peripheral documentation for the new SoC yet. So we only have a preliminary
> datasheet [1] and reduced schematics [2].
> 
> Known issues:
> Since Linux 5.3-rc1 DMA doesn't work properly on that platform.
> Nicolas Saenz Julienne investigates on that issue. As a temporary workaround
> i reverted the following patch to test this series:
> 
> 79a98672 "dma-mapping: remove dma_max_pfn"
> 7559d612 "mmc: core: let the dma map ops handle bouncing"

[ adding Matthias and Guillaume who first saw this ]
[ also adding Adrian Hunter just in case ]

Hi,
we stubled upon a bug in RPi's sdhci-iproc while testing this series.

It only shows-up on slow SD cards, the class 4 ones. On each SD operation we
get the following warning:

[    2.093328] mmc1: Got data interrupt 0x00000002 even though no data operation was in progress.
[    2.102072] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
[    2.108603] mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00001002
[    2.115134] mmc1: sdhci: Blk size:  0x00007200 | Blk cnt:  0x00000000
[    2.121664] mmc1: sdhci: Argument:  0x00000000 | Trn mode: 0x00000033
[    2.128195] mmc1: sdhci: Present:   0x1fff0000 | Host ctl: 0x00000017
[    2.134725] mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000080
[    2.141255] mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x00000107
[    2.147785] mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
[    2.154314] mmc1: sdhci: Int enab:  0x03ff100b | Sig enab: 0x03ff100b
[    2.160843] mmc1: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000000
[    2.167373] mmc1: sdhci: Caps:      0x45ee6432 | Caps_1:   0x0000a525
[    2.173902] mmc1: sdhci: Cmd:       0x00000c1a | Max curr: 0x00080008
[    2.180432] mmc1: sdhci: Resp[0]:   0x00000b00 | Resp[1]:  0x00edc87f
[    2.186961] mmc1: sdhci: Resp[2]:   0x325b5900 | Resp[3]:  0x00400e00
[    2.193490] mmc1: sdhci: Host ctl2: 0x00000001
[    2.197992] mmc1: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0xec040208
[    2.204521] mmc1: sdhci: ============================================

Aside from the serial console noise the RPi still boots alright. But as it's
printing one of these per SD operation which is a lot...

I've been able to reproduce this both with arm and arn64 on multiple SD cards.
Just copying the contents of a class 4 card into a class 10 one fixes the
issue.

Any ideas?

Regards,
Nicolas

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