linux-kernel - Re: [PATCH] mmc: sdhci-iproc: fix spurious interrupts on Multiblock reads with bcm2711

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Date:   Fri, 04 Oct 2019 14:59:35 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Cc:     wahrenst@....net, Matthias Brugger <mbrugger@...e.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci-iproc: fix spurious interrupts on Multiblock
 reads with bcm2711

On Fri, 2019-10-04 at 14:52 +0200, Nicolas Saenz Julienne wrote:
> The Raspberry Pi 4 SDHCI hardware seems to automatically issue CMD12
> after multiblock reads even when ACMD12 is disabled. This triggers
> spurious interrupts after the data transfer is done with the following
> message:
> 
>   mmc1: Got data interrupt 0x00000002 even though no data operation was in
> progress.
>   mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
>   mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00001002
>   mmc1: sdhci: Blk size:  0x00007200 | Blk cnt:  0x00000000
>   mmc1: sdhci: Argument:  0x00000000 | Trn mode: 0x00000033
>   mmc1: sdhci: Present:   0x1fff0000 | Host ctl: 0x00000017
>   mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000080
>   mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x00000107
>   mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
>   mmc1: sdhci: Int enab:  0x03ff100b | Sig enab: 0x03ff100b
>   mmc1: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000000
>   mmc1: sdhci: Caps:      0x45ee6432 | Caps_1:   0x0000a525
>   mmc1: sdhci: Cmd:       0x00000c1a | Max curr: 0x00080008
>   mmc1: sdhci: Resp[0]:   0x00000b00 | Resp[1]:  0x00edc87f
>   mmc1: sdhci: Resp[2]:   0x325b5900 | Resp[3]:  0x00400e00
>   mmc1: sdhci: Host ctl2: 0x00000001
>   mmc1: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0xf3025208
>   mmc1: sdhci: ============================================
> 
> Enable SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 to enable ACMD12 on multiblock
> reads and suppress the spurious interrupts.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> Tested-by: Matthias Brugger <mbrugger@...e.com>

Forgot to add:

Fixes: f84e411c85be ("mmc: sdhci-iproc: Add support for emmc2 of the BCM2711")

I'll resend if needed.

Regards,
Nicolas


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