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mmc: core: Record card drive strength 

In preparation for adding drive strength support
for eMMC, add drive_strength to struct mmc_card
to record the card drive strength for UHS-I modes
and HS200 / HS400. For eMMC this will be needed
when switching between HS200 and HS400.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2015-02-06 14:12:56 +02:00 committed by Ulf Hansson
parent e23350b35d
commit 3853a04232
3 changed files with 7 additions and 0 deletions
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3
drivers/mmc/core/sd.c
View File

@ -389,6 +389,8 @@ static int sd_select_driver_type(struct mmc_card *card, u8 *status)
int card_drv_type, drive_strength, drv_type; int card_drv_type, drive_strength, drv_type;
int err; int err;
card->drive_strength = 0;
card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
drive_strength = mmc_select_drive_strength(card, drive_strength = mmc_select_drive_strength(card,
@ -404,6 +406,7 @@ static int sd_select_driver_type(struct mmc_card *card, u8 *status)
mmc_hostname(card->host)); mmc_hostname(card->host));
return 0; return 0;
} }
card->drive_strength = drive_strength;
} }
if (drv_type) if (drv_type)

3
drivers/mmc/core/sdio.c
View File

@ -406,6 +406,8 @@ static void sdio_select_driver_type(struct mmc_card *card)
unsigned char card_strength; unsigned char card_strength;
int err; int err;
card->drive_strength = 0;
card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
drive_strength = mmc_select_drive_strength(card, drive_strength = mmc_select_drive_strength(card,
@ -427,6 +429,7 @@ static void sdio_select_driver_type(struct mmc_card *card)
card_strength, NULL); card_strength, NULL);
if (err) if (err)
return; return;
card->drive_strength = drive_strength;
} }
if (drv_type) if (drv_type)

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

@ -305,6 +305,7 @@ struct mmc_card {
unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */ unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */
unsigned int mmc_avail_type; /* supported device type by both host and card */ unsigned int mmc_avail_type; /* supported device type by both host and card */
unsigned int drive_strength; /* for UHS-I, HS200 or HS400 */
struct dentry *debugfs_root; struct dentry *debugfs_root;
struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */ struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */