redonkable/alistair23-linux
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mmc: sdhci: only set 200mA support for 1.8v if 200mA is available

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max_current_caps can return 0 if not available from the sd controller.
If no regulator is present or the regulator specifies a current
less then 200ma, we no longer still set the 200mA caps bit anyway.

Signed-off-by: Philip Rakity <prakity@marvell.com>
Reviewed-by: Aaron Lu <aaron_lu@amd.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Philip Rakity 2012-05-27 18:36:33 -07:00 committed by Chris Ball
parent bad37e1ac6
commit 0aa6770000
3 changed files with 14 additions and 12 deletions
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23
drivers/mmc/core/sd.c
View file

@ -553,13 +553,13 @@ static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
static int sd_set_current_limit(struct mmc_card *card, u8 *status)
{
int current_limit = 0;
int current_limit = SD_SET_CURRENT_NO_CHANGE;
int err;
/*
* Current limit switch is only defined for SDR50, SDR104, and DDR50
* bus speed modes. For other bus speed modes, we set the default
* current limit of 200mA.
* bus speed modes. For other bus speed modes, we do not change the
* current limit.
*/
if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
(card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
@ -595,17 +595,18 @@ static int sd_set_current_limit(struct mmc_card *card, u8 *status)
if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
current_limit = SD_SET_CURRENT_LIMIT_200;
}
} else
current_limit = SD_SET_CURRENT_LIMIT_200;
}
err = mmc_sd_switch(card, 1, 3, current_limit, status);
if (err)
return err;
if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
err = mmc_sd_switch(card, 1, 3, current_limit, status);
if (err)
return err;
if (((status[15] >> 4) & 0x0F) != current_limit)
pr_warning("%s: Problem setting current limit!\n",
mmc_hostname(card->host));
if (((status[15] >> 4) & 0x0F) != current_limit)
pr_warning("%s: Problem setting current limit!\n",
mmc_hostname(card->host));
}
return 0;
}

2
drivers/mmc/host/sdhci.c
View file

@ -2914,7 +2914,7 @@ int sdhci_add_host(struct sdhci_host *host)
mmc->caps |= MMC_CAP_MAX_CURRENT_600;
else if (max_current_180 >= 400)
mmc->caps |= MMC_CAP_MAX_CURRENT_400;
else
else if (max_current_180 >= 200)
mmc->caps |= MMC_CAP_MAX_CURRENT_200;
}

1
include/linux/mmc/card.h
View file

@ -149,6 +149,7 @@ struct sd_switch_caps {
#define SD_SET_CURRENT_LIMIT_400 1
#define SD_SET_CURRENT_LIMIT_600 2
#define SD_SET_CURRENT_LIMIT_800 3
#define SD_SET_CURRENT_NO_CHANGE (-1)
#define SD_MAX_CURRENT_200 (1 << SD_SET_CURRENT_LIMIT_200)
#define SD_MAX_CURRENT_400 (1 << SD_SET_CURRENT_LIMIT_400)