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>
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@ -136,6 +136,7 @@ static void sd_recalculate_clock(struct storage_media *media)
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int sd_change_freq(struct storage_media *media)
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{
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int delay;
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int err, timeout;
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struct mmc_command cmd;
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struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
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@ -225,11 +226,23 @@ int sd_change_freq(struct storage_media *media)
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if (!((ctrlr->caps & DRVR_CAP_HS52) && (ctrlr->caps & DRVR_CAP_HS)))
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goto out;
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/* Give the card time to recover afer the switch operation. Wait for
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* 9 (>= 8) clock cycles receiving the switch status.
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*/
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delay = (9000000 + ctrlr->bus_hz - 1) / ctrlr->bus_hz;
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udelay(delay);
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/* Switch to high speed */
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err = sd_switch(ctrlr, SD_SWITCH_SWITCH, 0, 1,
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(uint8_t *)switch_status);
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if (err)
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return err;
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/* Give the card time to perform the switch operation. Wait for 9
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* (>= 8) clock cycles receiving the switch status.
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*/
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udelay(delay);
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if ((ntohl(switch_status[4]) & 0x0f000000) == 0x01000000) {
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media->caps |= DRVR_CAP_HS;
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SET_TIMING(ctrlr, BUS_TIMING_SD_HS);
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