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drivers/storage: Delay after SD SWITCH operations

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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>
This commit is contained in:
Lee Leahy 2017-05-11 14:51:25 -07:00
parent 7723133073
commit f542aca090
1 changed files with 13 additions and 0 deletions
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13
src/drivers/storage/sd.c
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@ -136,6 +136,7 @@ static void sd_recalculate_clock(struct storage_media *media)
int sd_change_freq(struct storage_media *media) int sd_change_freq(struct storage_media *media)
{ {
int delay;
int err, timeout; int err, timeout;
struct mmc_command cmd; struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr; 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))) if (!((ctrlr->caps & DRVR_CAP_HS52) && (ctrlr->caps & DRVR_CAP_HS)))
goto out; 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, err = sd_switch(ctrlr, SD_SWITCH_SWITCH, 0, 1,
(uint8_t *)switch_status); (uint8_t *)switch_status);
if (err) if (err)
return 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) { if ((ntohl(switch_status[4]) & 0x0f000000) == 0x01000000) {
media->caps |= DRVR_CAP_HS; media->caps |= DRVR_CAP_HS;
SET_TIMING(ctrlr, BUS_TIMING_SD_HS); SET_TIMING(ctrlr, BUS_TIMING_SD_HS);