linux-kernel - RE: [PATCH] mmc: sdhci-of-arasan: Add quirk to avoid erroneous msg

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Message-ID: <HK2PR0601MB13939B7510C1A4726197797CF5C00@HK2PR0601MB1393.apcprd06.prod.outlook.com>
Date:   Tue, 27 Feb 2018 14:14:15 +0000
From:   Phil Edworthy <phil.edworthy@...esas.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
CC:     Michal Simek <michal.simek@...inx.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH] mmc: sdhci-of-arasan: Add quirk to avoid erroneous msg

Hi Adrian,

On 27 February 2018 14:08, Adrian Hunter wrote:
> On 27/02/18 15:55, Phil Edworthy wrote:
> > Since the controller does not support the end-of-busy IRQ, don't use it.
> > Otherwise, on older SD cards you will get lots of these messages:
> > "mmc0: Got data interrupt 0x00000002 even though no data operation was
> in progress"
> 
> SDHCI_QUIRK2_STOP_WITH_TC may be the quirk you want but it doesn't
> match your description.  SDHCI_QUIRK2_STOP_WITH_TC is when we always
> get a TC
> (end-of-busy) IRQ with the STOP command even when we didn't ask for
> one.
> Hence the TC interrupt (0x00000002) comes when we think we are already
> finished.
Right, thanks for clarifying, I'll fixup the message.

> >
> > This has been reported on Xilinx devices that also use the Arasan IP.
> > See https://patchwork.kernel.org/patch/8062871/
> >
> > This has been tested on the Renesas RZ/ND-DB board with the RZ/N1 SoC.
> >
> > Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
> > ---
> >  drivers/mmc/host/sdhci-of-arasan.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-of-arasan.c
> > b/drivers/mmc/host/sdhci-of-arasan.c
> > index c33a5f7..ab66e32 100644
> > --- a/drivers/mmc/host/sdhci-of-arasan.c
> > +++ b/drivers/mmc/host/sdhci-of-arasan.c
> > @@ -290,7 +290,8 @@ static const struct sdhci_pltfm_data
> sdhci_arasan_pdata = {
> >  	.ops = &sdhci_arasan_ops,
> >  	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> >  	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> > -			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> > +			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
> > +			SDHCI_QUIRK2_STOP_WITH_TC,
> >  };
> >
> >  static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32
> > intmask)
> >