[PATCH 0/5 RFC] mmc: sdhci-iproc: add bcm2835 support
stefan.wahren at i2se.com
Wed Jan 20 13:18:06 PST 2016
> Eric Anholt <eric at anholt.net> hat am 19. Januar 2016 um 22:00 geschrieben:
> Stefan Wahren <stefan.wahren at i2se.com> writes:
> > This patch series based on the suggestion of Scott Branden to implement
> > bcm2835 support into sdhci-iproc .
> > These changes provide the following advantages:
> > * no need to maintain a separate driver for bcm2835
> > * improve support and test coverage of bcm2835 mmc support
> > * get the rid of SDHCI_CAPABILITIES hack in bcm2835_sdhci_readl
> > * increase write performance by avoiding delays in write ops
> > Patch 1 and 2 adopt two sdhci-bcm2835 fixes to sdhci-iproc. The third patch
> > tries to specify as much quirks as possible in the bcm283x.dtsi as possible.
> > Patch 4 and 5 are the actually changes for bcm2835 support.
> > These series has been tested on Raspberry Pi B with dd (direct I/O):
> > sdhci-bcm2835
> > 378 kB/s WRITE
> > 10,6 MB/s READ
> > sdhci-iproc (after applying patch series)
> > 881 kB/s WRITE
> > 10,8 MB/s READ
> I started a while ago at looking at merging the sdhost driver (for the
> other controller on these boards that you can use instead), since
> apparently the hardware's a better choice to use. This looks like a
> really nice simplification for us for the Arasan mode, though. Would
> you also want to delete the old 2835 driver after this series?
Yes, that would be a necessary step. I don't know when it's the right time.
What is the usual procedure for such a necessary driver?
> These patches are all:
> Acked-by: Eric Anholt <eric at anholt.net>
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