Commit 4f25580f authored Sep 30, 2016 by Shawn Lin Committed by Ulf Hansson Oct 10, 2016

mmc: core: changes frequency to hs_max_dtr when selecting hs400es



Per JESD84-B51 P49, Host need to change frequency to <=52MHz
after setting HS_TIMING to 0x1, and host may changes frequency
to <= 200MHz after setting HS_TIMING to 0x3. That means the card
expects the clock rate to increase from the current used f_init
(which is less than 400KHz, but still being less than 52MHz) to
52MHz, otherwise we find some eMMC devices significantly report
failure when sending status.

Reported-by: Xiao Yao <xiaoyao@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 1720d354

drivers/mmc/core/mmc.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1282,6 +1282,8 @@ static int mmc_select_hs400es(struct mmc_card *card)
		if (err)
		goto out_err;

		mmc_set_clock(host, card->ext_csd.hs_max_dtr);

		err = mmc_switch_status(card);
		if (err)
		goto out_err;