+Travis Dirkes (with corrected email),
Could you provide more details on the Micron data error.
> On 2021-04-12 12:44 a.m., Ulf Hansson wrote:
>> + Bean Huo, Luca Porzio
>>
>> On Thu, 8 Apr 2021 at 19:59, Scott Branden <scott.branden@xxxxxxxxxxxx> wrote:
>>>
>>> From: Vladimir Olovyannikov <vladimir.olovyannikov@xxxxxxxxxxxx>
>>>
>>> In certain rare combination of operations, Micron eMMC v5.0 cards
>>> may experience data errors if internal cache is enabled.
>>> This may lead to eMMC related data errors.
>>> Introduce a quirk to disable cache on these eMMC cards.
>>
>> Can you please elaborate on this, what combinations of operations are
>> you referring to - and what kind of data errors?
>>
>> I have also looped in some of the Micron guys, to let them chim in.
>>
>>>
>>> Signed-off-by: Vladimir Olovyannikov <vladimir.olovyannikov@xxxxxxxxxxxx>
>>> Signed-off-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
>>
>> Kind regards
>> Uffe
>>
>>> ---
>>> drivers/mmc/core/card.h | 5 +++++
>>> drivers/mmc/core/mmc.c | 4 ++--
>>> drivers/mmc/core/quirks.h | 8 ++++++++
>>> include/linux/mmc/card.h | 1 +
>>> 4 files changed, 16 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
>>> index 7bd392d55cfa..22cea63ac359 100644
>>> --- a/drivers/mmc/core/card.h
>>> +++ b/drivers/mmc/core/card.h
>>> @@ -222,4 +222,9 @@ static inline int mmc_card_broken_hpi(const struct mmc_card *c)
>>> return c->quirks & MMC_QUIRK_BROKEN_HPI;
>>> }
>>>
>>> +static inline int mmc_card_broken_cache(const struct mmc_card *c)
>>> +{
>>> + return c->quirks & MMC_QUIRK_BROKEN_CACHE;
>>> +}
>>> +
>>> #endif
>>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>>> index 8741271d3971..cd83b7f0e59c 100644
>>> --- a/drivers/mmc/core/mmc.c
>>> +++ b/drivers/mmc/core/mmc.c
>>> @@ -1820,12 +1820,12 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>>> * sudden power failure tests. Let's extend the timeout to a minimum of
>>> * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
>>> */
>>> - if (card->ext_csd.cache_size > 0) {
>>> + if (!mmc_card_broken_cache(card) && card->ext_csd.cache_size > 0) {
>>> unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
>>>
>>> timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
>>> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>>> - EXT_CSD_CACHE_CTRL, 1, timeout_ms);
>>> + EXT_CSD_CACHE_CTRL, 1, timeout_ms);
>>> if (err && err != -EBADMSG)
>>> goto free_card;
>>>
>>> diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
>>> index d68e6e513a4f..23972d87c82a 100644
>>> --- a/drivers/mmc/core/quirks.h
>>> +++ b/drivers/mmc/core/quirks.h
>>> @@ -116,6 +116,14 @@ static const struct mmc_fixup __maybe_unused mmc_ext_csd_fixups[] = {
>>> MMC_FIXUP_EXT_CSD_REV(CID_NAME_ANY, CID_MANFID_NUMONYX,
>>> 0x014e, add_quirk, MMC_QUIRK_BROKEN_HPI, 6),
>>>
>>> + /*
>>> + * In certain rare combination of operations, Micron eMMC v5.0 cards
>>> + * may experience data errors if internal cache is enabled.
>>> + * Disabling cache for these cards eliminates the issue.
>>> + */
>>> + MMC_FIXUP_EXT_CSD_REV(CID_NAME_ANY, CID_MANFID_MICRON,
>>> + 0x014e, add_quirk, MMC_QUIRK_BROKEN_CACHE, 7),
>>> +
>>> END_FIXUP
>>> };
>>>
>>> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
>>> index f9ad35dd6012..22f256a4e54e 100644
>>> --- a/include/linux/mmc/card.h
>>> +++ b/include/linux/mmc/card.h
>>> @@ -270,6 +270,7 @@ struct mmc_card {
>>> #define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake interrupt */
>>> #define MMC_QUIRK_TRIM_BROKEN (1<<12) /* Skip trim */
>>> #define MMC_QUIRK_BROKEN_HPI (1<<13) /* Disable broken HPI support */
>>> +#define MMC_QUIRK_BROKEN_CACHE (1<<14) /* Disable broken cache */
>>>
>>> bool reenable_cmdq; /* Re-enable Command Queue */
>>>
>>> --
>>> 2.17.1
>>>
>
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