linux-kernel - Re: [PATCH] mmc: add quirk for O2 Micro dev 0x8620 rev 0x01

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Date:   Thu, 27 Sep 2018 14:11:23 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Yu Zhao <yuzhao@...gle.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Guenter Roeck <groeck@...gle.com>
Subject: Re: [PATCH] mmc: add quirk for O2 Micro dev 0x8620 rev 0x01

On 27 September 2018 at 03:40, Yu Zhao <yuzhao@...gle.com> wrote:
> On Thu, Sep 27, 2018 at 01:48:58AM +0200, Ulf Hansson wrote:
>> On 23 September 2018 at 22:39, Yu Zhao <yuzhao@...gle.com> wrote:
>> > This device reports SDHCI_CLOCK_INT_STABLE even though it's not
>> > ready to take SDHCI_CLOCK_CARD_EN. The symptom is that reading
>> > SDHCI_CLOCK_CONTROL after enabling the clock shows absence of the
>> > bit from the register (e.g. expecting 0x0000fa07 = 0x0000fa03 |
>> > SDHCI_CLOCK_CARD_EN but only observed the first operand).
>> >
>> > mmc1: Timeout waiting for hardware cmd interrupt.
>> > mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
>> > mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00000603
>> > mmc1: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
>> > mmc1: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000
>> > mmc1: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
>> > mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
>> > mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000fa03
>> > mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
>> > mmc1: sdhci: Int enab:  0x00ff0083 | Sig enab: 0x00ff0083
>> > mmc1: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000
>> > mmc1: sdhci: Caps:      0x25fcc8bf | Caps_1:   0x00002077
>> > mmc1: sdhci: Cmd:       0x00000000 | Max curr: 0x005800c8
>> > mmc1: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
>> > mmc1: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
>> > mmc1: sdhci: Host ctl2: 0x00000008
>> > mmc1: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0x00000000
>> > mmc1: sdhci: ============================================
>> >
>> > The problem happens during wakeup from S3. Adding a delay quirk
>> > after power up reliably fixes the problem.
>> >
>> > Signed-off-by: Yu Zhao <yuzhao@...gle.com>
>>
>> Applied for next, thanks!
>>
>> Kind regards
>> Uffe
>>
>> > ---
>> >  drivers/mmc/host/sdhci-pci-o2micro.c | 2 ++
>> >  1 file changed, 2 insertions(+)
>> >
>> > diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
>> > index 77e9bc4aaee9..3e5ecf7ce101 100644
>> > --- a/drivers/mmc/host/sdhci-pci-o2micro.c
>> > +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
>> > @@ -490,6 +490,8 @@ int sdhci_pci_o2_probe(struct sdhci_pci_chip *chip)
>> >                 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
>> >                 break;
>> >         case PCI_DEVICE_ID_O2_SEABIRD0:
>> > +               if (chip->pdev->revision == 0x01)
>> > +                       chip->quirks |= SDHCI_QUIRK_DELAY_AFTER_POWER;
>
> Hi Uffe,
>
> I apologize for the missing /* fall through */ here. Could you
> please add it in case it causes any static checker problem?
> Or I can send a v2.

I amended the change, no action needed. Thanks!

Kind regards
Uffe