Stefan Wahren <stefan.wahren@xxxxxxxx> writes: > Hi Eric, > >> Eric Anholt <eric@xxxxxxxxxx> hat am 3. Januar 2017 um 19:27 geschrieben: >> >> >> Stefan Wahren <stefan.wahren@xxxxxxxx> writes: >> >> > Since the mmc module on bcm2835 neither provide a capabilities register nor >> > free documentation we must rely on the downstream implementation [1]. >> >> Yeah, caps reg is wired to 0, but it can do high speed. >> >> Since we're VDD_330 only, I'm not sure the driver type flags do >> anything, but I'm still good with having consistency. > > yes, the driver type flags currently have no benefit. > >> >> Reviewed-by: Eric Anholt <eric@xxxxxxxxxx> >> >> Interested in porting over the DMA support? :) > > AFAIK the sdhci doesn't support external DMA (required for bcm2835). > So DMA support would result in a new driver, which i'm currently not interested. > > But i've prepared a fixup patch series for the sdhost driver i want to send to Gerd. > >> >> I also noticed that the emmc wrapper module claims it can run with a >> clock from 50-100mhz, and the arasan says it can run at up to 50, 52, or >> 208mhz depending on SD/MMC mode. Could we get a boost from running the >> module at a higher clock rate? > > Sorry, i can't follow. Do you mean DDR mode? Apparently I what I was reading about was SDR104 mode, which also requires 1.8V.
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