[U-Boot] [RFC PATCH 2/2] mmc: add support for block device cache

[Eric Nelson]

Hi Tom,

On 03/20/2016 03:13 PM, Tom Rini wrote:
> On Sun, Mar 20, 2016 at 12:35:53PM -0700, Eric Nelson wrote:
>> Hi Stephen,
>>
>> On 03/17/2016 02:23 PM, Stephen Warren wrote:
>>> On 03/16/2016 03:40 PM, Eric Nelson wrote:
>>>> Signed-off-by: Eric Nelson <eric at nelint.com>
>>>
>>> Patch description.
>>>
>>>> ---
>>>>   drivers/mmc/mmc.c       | 10 +++++++++-
>>>>   drivers/mmc/mmc_write.c |  7 +++++++
>>>
>>> Presumably it makes sense for the cache to work for IDE, SATA, USB,
>>> SCSI, ... too. I wonder if it's possible to put this code somewhere more
>>> central than mmc*.c so it automatically applies to
>>> dev_desc->block_read() (see include/part.h). Perhaps not since each
>>> implementation supplies its own block_read function directly, so the
>>> cache calls do need to be duplicated everywhere.
>>>
>>
>> Yeah. I haven't found a spot that would allow interception of
>> the various block_read/write functions.
> 
> Shouldn't DM also help here?
> 

I haven't yet looked, but this may be true.

I'm seeing some build breakage on master surrounding the use
of DM though.

If I select DM and BLK on top of nitrogen6q_defconfig, I get
lots of build errors.

I want to get a V2 RFC patch out before digging through the
details of that.

Regards,


Eric