evie/android_kernel_oneplus_msm8998
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mmc: core: Select HS mode in device first and then in the host

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While switching from hs400 to hs200 mode, high speed mode
timing should be selected in the device before changing the
clock frequency in the host. But current implementation,
(mmc_hs400_to_hs200) first updates the frequency in the host
and then updates mode in the device. This is a spec violation.
Hence update the sequence to comply with the spec.

Change-Id: I0694edac9dd005ec68add9cc38bbe6fa4245ed48
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
This commit is contained in:
Sayali Lokhande 2017-07-05 11:21:28 +05:30 • committed by Gerrit - the friendly Code Review server
parent 3ec8bfc9bb
commit b52748d7fc
1 changed files with 4 additions and 4 deletions
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8
drivers/mmc/core/mmc.c
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@ -1323,10 +1323,6 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
send_status = false;
/* Reduce frequency to HS */
max_dtr = card->ext_csd.hs_max_dtr;
mmc_set_clock(host, max_dtr);
/* Switch HS400 to HS DDR */
val = EXT_CSD_TIMING_HS;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
@ -1337,6 +1333,10 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
/* Reduce frequency to HS */
max_dtr = card->ext_csd.hs_max_dtr;
mmc_set_clock(host, max_dtr);
if (!send_status) {
err = mmc_switch_status(card, false);
if (err)