Hello, On Wed, 21 Mar 2018 12:18:58 +0100 Maxime Ripard <maxime.rip...@bootlin.com> wrote:
> From: Philipp Tomsich <philipp.toms...@theobroma-systems.com> > > Throughput tests have shown the sunxi_mmc driver to take over 10s to > read 10MB from a fast eMMC device due to excessive delays in polling > loops. > > This commit restructures the main polling loops to use get_timer(...) > to determine whether a (millisecond) timeout has expired. We choose > not to use the wait_bit function, as we don't need interruptability > with ctrl-c and have at least one case where two bits (one for an > error condition and another one for completion) need to be read and > using wait_bit would have not added to the clarity. > > The observed speedup in testing on a A31 is greater than 10x (e.g. a > 10MB write decreases from 9.302s to 0.884s). > > Signed-off-by: Philipp Tomsich <philipp.toms...@theobroma-systems.com> > Signed-off-by: Maxime Ripard <maxime.rip...@bootlin.com> Tested-by: Mylène Josserand <mylene.josser...@bootlin.com> Thanks, -- Mylène Josserand, Bootlin (formerly Free Electrons) Embedded Linux and Kernel engineering http://bootlin.com _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
