On Sun, 2014-12-07 at 21:23 +0100, Hans de Goede wrote: > The sunxi mmc controller has both an internal clock divider, as well as > the divider in the mod0-clk for the mmc controller. > > The internal divider cannot be used, as it conflicts with the setting of > clock sampling phases which is done in the mod0-clk, so it must be set to > 0 (divide by 1). > > For some reason while the kernel has had this correct from day one, the > u-boot sunxi mmc code has been using a fixed mod0-clk and setting its > internal divider depending on the desired speed. This is something which > we've inherited from the original Allwinner u-boot sources, but while this > has been fixed in Allwinner's own u-boot code at least for the A23 and later > upstream u-boot was still doing this wrong. > > This commit fixes this, thereby also fixing mmc support not working reliable > on the A23 (which seems more sensitive to this) and possible also fixes some > other sunxi mmc issues. > > Signed-off-by: Hans de Goede <hdego...@redhat.com>
Acked-by: Ian Campbell <i...@hellion.org.uk> _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot