diff options
| author | Lee Leahy <leroy.p.leahy@intel.com> | 2017-05-11 14:51:25 -0700 |
|---|---|---|
| committer | Lee Leahy <leroy.p.leahy@intel.com> | 2017-05-12 18:20:08 +0200 |
| commit | f542aca0908ead68314a6d9603dde8849abcff19 (patch) | |
| tree | 778ddd24e4ea3b5ca888ee1826b0dd153df9dba0 /src/drivers/storage/sd.c | |
| parent | 77231330739962e4a76ae23f42a840558a0c675f (diff) | |
drivers/storage: Delay after SD SWITCH operations
Delay for a while after the switch operations to let the card recover.
TEST=Build and run on Galileo Gen2
Change-Id: I938e227a142e43ed6afda80d56af90df0bae1b05
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/19671
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/drivers/storage/sd.c')
| -rw-r--r-- | src/drivers/storage/sd.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/drivers/storage/sd.c b/src/drivers/storage/sd.c index 18d2c0e245..6f4887a1a1 100644 --- a/src/drivers/storage/sd.c +++ b/src/drivers/storage/sd.c @@ -136,6 +136,7 @@ static void sd_recalculate_clock(struct storage_media *media) int sd_change_freq(struct storage_media *media) { + int delay; int err, timeout; struct mmc_command cmd; struct sd_mmc_ctrlr *ctrlr = media->ctrlr; @@ -225,11 +226,23 @@ int sd_change_freq(struct storage_media *media) if (!((ctrlr->caps & DRVR_CAP_HS52) && (ctrlr->caps & DRVR_CAP_HS))) goto out; + /* Give the card time to recover afer the switch operation. Wait for + * 9 (>= 8) clock cycles receiving the switch status. + */ + delay = (9000000 + ctrlr->bus_hz - 1) / ctrlr->bus_hz; + udelay(delay); + + /* Switch to high speed */ err = sd_switch(ctrlr, SD_SWITCH_SWITCH, 0, 1, (uint8_t *)switch_status); if (err) return err; + /* Give the card time to perform the switch operation. Wait for 9 + * (>= 8) clock cycles receiving the switch status. + */ + udelay(delay); + if ((ntohl(switch_status[4]) & 0x0f000000) == 0x01000000) { media->caps |= DRVR_CAP_HS; SET_TIMING(ctrlr, BUS_TIMING_SD_HS); |