[coreboot-gerrit] Change in coreboot[master]: drivers/storage: Delay after SD SWITCH operations
Lee Leahy (Code Review)
gerrit at coreboot.org
Fri May 12 18:20:10 CEST 2017
Lee Leahy has submitted this change and it was merged. ( https://review.coreboot.org/19671 )
Change subject: drivers/storage: Delay after SD SWITCH operations
......................................................................
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 at intel.com>
Reviewed-on: https://review.coreboot.org/19671
Tested-by: build bot (Jenkins) <no-reply at coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi at google.com>
---
M src/drivers/storage/sd.c
1 file changed, 13 insertions(+), 0 deletions(-)
Approvals:
build bot (Jenkins): Verified
Patrick Georgi: Looks good to me, approved
diff --git a/src/drivers/storage/sd.c b/src/drivers/storage/sd.c
index 18d2c0e..6f4887a 100644
--- a/src/drivers/storage/sd.c
+++ b/src/drivers/storage/sd.c
@@ -136,6 +136,7 @@
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 @@
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);
--
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Gerrit-MessageType: merged
Gerrit-Change-Id: I938e227a142e43ed6afda80d56af90df0bae1b05
Gerrit-PatchSet: 2
Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Owner: Lee Leahy <leroy.p.leahy at intel.com>
Gerrit-Reviewer: Aaron Durbin <adurbin at chromium.org>
Gerrit-Reviewer: Lee Leahy <leroy.p.leahy at intel.com>
Gerrit-Reviewer: Martin Roth <martinroth at google.com>
Gerrit-Reviewer: Patrick Georgi <pgeorgi at google.com>
Gerrit-Reviewer: Paul Menzel <paulepanter at users.sourceforge.net>
Gerrit-Reviewer: Philippe Mathieu-Daudé <philippe.mathieu.daude at gmail.com>
Gerrit-Reviewer: build bot (Jenkins) <no-reply at coreboot.org>
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