linux-kernel - Re: [PATCH 2/3] sdhci: sparx5: Add Sparx5 SoC eMMC driver

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Message-ID: <87wo56q2o3.fsf@soft-dev15.microsemi.net>
Date:   Wed, 20 May 2020 13:14:04 +0200
From:   Lars Povlsen <lars.povlsen@...rochip.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
CC:     Ulf Hansson <ulf.hansson@...aro.org>, SoC Team <soc@...nel.org>,
        "Microchip Linux Driver Support" <UNGLinuxDriver@...rochip.com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Subject: Re: [PATCH 2/3] sdhci: sparx5: Add Sparx5 SoC eMMC driver

Lars Povlsen writes:

> Adrian Hunter writes:
>
>> On 13/05/20 4:31 pm, Lars Povlsen wrote:
>>> This adds the eMMC driver for the Sparx5 SoC. It is based upon the
>>> designware IP, but requires some extra initialization and quirks.
>>>
>>> Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
>>> Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
>>> ---
{Snip]
>>> +};
>>> +
>>> +static const struct sdhci_pltfm_data sdhci_sparx5_pdata = {
>>> +     .quirks  = 0,
>>> +     .quirks2 = SDHCI_QUIRK2_HOST_NO_CMD23 | /* Card quirk */
>>
>> If this is a card quirk then it should be in drivers/mmc/core/quirks.h not here.
>

Adrian, I had a go at changing the controller quirk to a card quirk.

Unfortunately, SDHCI_QUIRK2_HOST_NO_CMD23 does not directly translate to
MMC_QUIRK_BLK_NO_CMD23, as for 'do_rel_wr' in mmc_blk_rw_rq_prep(), it
will *still* use MMC_SET_BLOCK_COUNT (cmd23), causing the issue.

We are using a ISSI "IS004G" device, and so I have gone through the
motions of adding it to quirks.h. The comment before the list of devices
using MMC_QUIRK_BLK_NO_CMD23 suggest working around a performance issue,
which is not exactly the issue I'm seeing. I'm seeing combinations of
CMD_TOUT_ERR, DATA_CRC_ERR and DATA_END_BIT_ERR whenever a cmd23 is
issued.

I have not been able to test the controller with another eMMC device
yet, but I expect its not the controller at fault.

So, I'm a little bit in doubt of how to proceed - either keep the quirk
as a controller quirk - or make a *new* card quirk (with
SDHCI_QUIRK2_HOST_NO_CMD23 semantics)?

Anybody else have had experience with ISSI eMMC devices?

I have also tried to use DT sdhci-caps-mask, but MMC_CAP_CMD23 is not
read from the controller just (unconditionally) set in sdhci.c - so that
doesn't fly either.

Any suggestions?

> Yes, its supposedly a card quirk. I'll see to use the card quirks
> methods in place.
>

-- 
Lars Povlsen,
Microchip