[PATCH v2 2/4] mmc: core: changes frequency to hs_max_dtr when selecting hs400es

From: Shawn Lin
Date: Thu Sep 22 2016 - 20:02:58 EST


Per JESD84-B51 P69, 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@xxxxxxxxxxxxxx>
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>

---

Changes in v2:
- improve the changelog

drivers/mmc/core/mmc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index f4ed5ac..39fc5b2 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -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;
--
2.3.7