[U-Boot] [PATCH V2] i.MX: fsl_esdhc: allow use with cache enabled.

[Dirk Behme <dirk.behme@de.bosch.com>]

On 09.05.2012 07:45, Stefano Babic wrote:
> On 09/05/2012 01:31, Eric Nelson wrote:
>> Thanks Andy,
>>
>> On 05/08/2012 03:59 PM, Andy Fleming wrote:
>>>> --- a/drivers/mmc/fsl_esdhc.c
>>>> +++ b/drivers/mmc/fsl_esdhc.c
>>>> @@ -190,6 +190,10 @@ static int esdhc_setup_data(struct mmc *mmc,
>>>> struct mmc_data *data)
>>>>                 esdhc_clrsetbits32(&regs->wml, WML_RD_WML_MASK,
>>>> wml_value);
>>>>                 esdhc_write32(&regs->dsaddr, (u32)data->dest);
>>>>         } else {
>>>> +               flush_dcache_range((ulong)data->src,
>>>> +                                  (ulong)data->src+data->blocks
>>>> +                                        *data->blocksize);
>>>> +
>>>
>>> This still won't work. I don't believe this is implemented at all on
>>> the FSL PowerPC parts that use this controller.
>>>
>>> At the very least, it needs to be protected by an ifdef.
>>>
>> It seems more generally useful to implement a PowerPC cache layer
>> than to instrument each driver that supports cache.
> 
> Some PowerPC (MPC86xx,  arch/powerpc/cpu/mpc86xx/cache.S) have this
> layer, some other not. This driver is used by MPC85xx and
> flush_dcache_range is not implemented. The reason is that this SOC  uses
> its internal snooping mechanism and does not need to explicitely flush
> the buffers in the drivers.
> 
> The problem with an #ifdef is that it is not very generic - we should
> add some #if (defined(CONFIG_MX51) || defined(CONFIG_MX53) || ...
> and update the driver for each new SOCs. I think also that maybe the
> best way is to add an empty flush_dcache_range() to the MPC85xx, maybe
> as weak function.

You might have noticed that I'm looking through my list of open patches. 
So: Any news regarding V3 of this patch? ;)

Many thanks

Dirk