2017-05-19 21:24 GMT+09:00 Masahiro Yamada <yamada.masah...@socionext.com>: > The MMC framework in U-Boot does not support a systematic API for > timing switch like mmc_set_timing() in Linux. > > U-Boot just provides a hook to change the clock frequency via > mmc_set_clock(). It is up to drivers if additional register > settings are needed. > > This driver needs to set a correct timing mode into a register when > it migrates to a different speed mode. Only increasing clock frequency > could result in setup/hold timing violation. > > The timing mode should be decided by checking MMC_TIMING_* like > drivers/mmc/host/sdhci-cadence.c in Linux, but "timing" is not > supported by U-Boot for now. Just use mmc->clock to decide the > timing mode. > > Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
I see lots of improvements for MMC core. Looks like it is better to rebase my work after they are merged. I marked this patch Superseded. -- Best Regards Masahiro Yamada _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
