Re: [PATCH 0/3] mmc: omap_hsmmc: support SDIO cards

[Mike Rapoport <mike@compulab.co.il>]

David Vrabel wrote:
> Mike Rapoport wrote:
>> I've started to apply the patches one by one and after the first patch
>> is applied, the SD card works Ok, but libertas fails to initialize with
>> the following messages:
>>
>>> modprobe libertas_sdio
>> [   82.233489] lib80211: common routines for IEEE802.11 drivers
>> [   82.833251] cfg80211: Calling CRDA to update world regulatory domain
>> [   83.327911] libertas_sdio: Libertas SDIO driver
>> [   83.332489] libertas_sdio: Copyright Pierre Ossman
>> [   83.348510] libertas_sdio mmc1:0001:1: firmware: requesting
>> sd8686_helper.bin
>> [   83.497619] libertas_sdio mmc1:0001:1: firmware: requesting sd8686.bin
>> [   83.679229] DMA synchronization event drop occurred with device 47
> 
> What block size are you using?  It looks like you're using something
> less than 512. I've checked the spec again and the DMA packet size
> should be the block size in words (and not the FIFO depth).

It's quite possible. I haven't dig too much and I really don't know how exactly
libertas driver sends/receives the data... I'll continue testing and will try to get
some more meaningful info

> Also, keep in mind that the buffers for transfers must begin and end on
> a word boundary.  The OMAP's DMA controller can only transfer whole
> words to the MMC FIFO.
> 
> David


-- 
Sincerely yours,
Mike.