Some eMMC will fail at the first switch, but would succeed in a subsequent
one.
Make sure we try several times to cover those cases. The number of retries
(and the behaviour) is currently what is being used in Linux.
Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com>
---
drivers/mmc/mmc.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 4380c7c195a6..d6b7e4f510c9 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -494,6 +494,7 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
{
struct mmc_cmd cmd;
int timeout = 1000;
+ int retries = 3;
int ret;
cmd.cmdidx = MMC_CMD_SWITCH;
@@ -502,11 +503,17 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8
value)
(index << 16) |
(value << 8);
- ret = mmc_send_cmd(mmc, &cmd, NULL);
+ while (retries > 0) {
+ ret = mmc_send_cmd(mmc, &cmd, NULL);
- /* Waiting for the ready status */
- if (!ret)
- ret = mmc_send_status(mmc, timeout);
+ /* Waiting for the ready status */
+ if (!ret) {
+ ret = mmc_send_status(mmc, timeout);
+ return ret;
+ }
+
+ retries--;
+ }
return ret;
--
git-series 0.8.11
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