mmc: When switching partition, use the timeout specified in the ext_csd
The e-MMC spec allows the e-MMC to specify a timeout for the partition
switch command. It can take up to 2550 ms. There is no lower limit to this
value in the spec, but do as the the linux driver does and force it to be
at least 300ms.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index ff56c3dd..e5cee7d 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -748,12 +748,17 @@
{
struct mmc_cmd cmd;
int timeout = DEFAULT_CMD6_TIMEOUT_MS;
+ bool is_part_switch = (set == EXT_CSD_CMD_SET_NORMAL) &&
+ (index == EXT_CSD_PART_CONF);
int retries = 3;
int ret;
if (mmc->gen_cmd6_time)
timeout = mmc->gen_cmd6_time * 10;
+ if (is_part_switch && mmc->part_switch_time)
+ timeout = mmc->part_switch_time * 10;
+
cmd.cmdidx = MMC_CMD_SWITCH;
cmd.resp_type = MMC_RSP_R1b;
cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
@@ -2152,6 +2157,11 @@
part_completed = !!(ext_csd[EXT_CSD_PARTITION_SETTING] &
EXT_CSD_PARTITION_SETTING_COMPLETED);
+ mmc->part_switch_time = ext_csd[EXT_CSD_PART_SWITCH_TIME];
+ /* Some eMMC set the value too low so set a minimum */
+ if (mmc->part_switch_time < MMC_MIN_PART_SWITCH_TIME && mmc->part_switch_time)
+ mmc->part_switch_time = MMC_MIN_PART_SWITCH_TIME;
+
/* store the partition info of emmc */
mmc->part_support = ext_csd[EXT_CSD_PARTITIONING_SUPPORT];
if ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) ||