2014-09-04 11:43 GMT+02:00 Arnd Bergmann <arnd@xxxxxxxx>:
> On Thursday 04 September 2014 17:37:59 Dong Aisheng wrote:
>> index 49f04bc..83d17a9 100644
>> --- a/drivers/mmc/core/mmc_ops.c
>> +++ b/drivers/mmc/core/mmc_ops.c
>> @@ -440,6 +440,12 @@ int __mmc_switch(struct mmc_card *card, u8 set,
>> u8 index, u8 value,
>> if (!use_busy_signal)
>> return 0;
>>
>> + /*
>> + * WORKAROUND: for Sandisk eMMC cards, it might need certain delay
>> + * before sending CMD13 after CMD6
>> + */
>> + mdelay(1);
>> +
>> /* Must check status to be sure of no errors */
>> timeout = jiffies + msecs_to_jiffies(MMC_OPS_TIMEOUT_MS);
>> do {
>>
>>
>
> mdelay() is a rather nasty function to call because it hogs the CPU.
> Better use msleep(), which will allow another process to use the
> CPU in the meantime.
> It might be worthwhile to check the manufacturer ID field so we
> don't delay the boot process for non-sandisk devices.
OK, so I will also move MFID defines from drivers/mmc/core/block.c to
include/linux/mmc/card.h which will allow the use of these defines
from mmc_ops.c.
I am testing right now and if it works, I will send a patch.
Thanks,
JM
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