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| author | Seungwon Jeon <tgih.jun@samsung.com> | 2012-04-25 16:18:01 +0900 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-05-09 10:04:12 -0400 |
| commit | 10942aa40a595d7ff8b4e90f8a762e816367cac3 (patch) | |
| tree | dcb9491d20361d05065274c3107cdc75abd25173 /drivers/mmc/core/mmc.c | |
| parent | 96cf5f02aee8bbeff38824b18b9ec583d687f846 (diff) | |
| download | lwn-10942aa40a595d7ff8b4e90f8a762e816367cac3.tar.gz lwn-10942aa40a595d7ff8b4e90f8a762e816367cac3.zip | |
mmc: core: fix the signaling 1.8V for HS200
Currently only 1.2V is treated for HS200 mode. If the host has only
1.8V I/O capability not 1.2V, mmc_set_signal_voltage can't be called
for 1.8V HS200. EXT_CSD_CARD_TYPE_SDR_1_8V needs to be considered.
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 0477769a8841..2a9b7b1a4801 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -728,7 +728,7 @@ static int mmc_select_powerclass(struct mmc_card *card, */ static int mmc_select_hs200(struct mmc_card *card) { - int idx, err = 0; + int idx, err = -EINVAL; struct mmc_host *host; static unsigned ext_csd_bits[] = { EXT_CSD_BUS_WIDTH_4, @@ -744,10 +744,12 @@ static int mmc_select_hs200(struct mmc_card *card) host = card->host; if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V && - host->caps2 & MMC_CAP2_HS200_1_2V_SDR) - if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0)) - err = mmc_set_signal_voltage(host, - MMC_SIGNAL_VOLTAGE_180, 0); + host->caps2 & MMC_CAP2_HS200_1_2V_SDR) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0); + + if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V && + host->caps2 & MMC_CAP2_HS200_1_8V_SDR) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0); /* If fails try again during next card power cycle */ if (err) |