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| author |  Adrian Hunter <adrian.hunter@intel.com>
| 2016-12-02 15:14:23 +0200 |
|---|---|---|
| committer |  Ulf Hansson <ulf.hansson@linaro.org>
| 2016-12-05 14:16:22 +0100 |
| commit | e711f0309109701cb422aab44ace4ea0dccb89ea (patch) | |
| tree | 43032d7231d650cca2d35bcd90afeadcdff0a61c /drivers/mmc | |
| parent | mmc: sdhci: Always allow tuning to fall back to fixed sampling (diff) | |
| download | linux-e711f0309109701cb422aab44ace4ea0dccb89ea.tar.gz linux-e711f0309109701cb422aab44ace4ea0dccb89ea.tar.bz2 linux-e711f0309109701cb422aab44ace4ea0dccb89ea.zip | |
mmc: mmc: Introduce mmc_abort_tuning()
If a tuning command times out, the card could still be processing it, which
will cause problems for recovery. The eMMC specification says that CMD12
can be used to stop CMD21, so add a function that does that.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/mmc_ops.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 81ce63bb0773..b11c3455b040 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -678,6 +678,31 @@ out: } EXPORT_SYMBOL_GPL(mmc_send_tuning); +int mmc_abort_tuning(struct mmc_host *host, u32 opcode) +{ + struct mmc_command cmd = {0}; + + /* + * eMMC specification specifies that CMD12 can be used to stop a tuning + * command, but SD specification does not, so do nothing unless it is + * eMMC. + */ + if (opcode != MMC_SEND_TUNING_BLOCK_HS200) + return 0; + + cmd.opcode = MMC_STOP_TRANSMISSION; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; + + /* + * For drivers that override R1 to R1b, set an arbitrary timeout based + * on the tuning timeout i.e. 150ms. + */ + cmd.busy_timeout = 150; + + return mmc_wait_for_cmd(host, &cmd, 0); +} +EXPORT_SYMBOL_GPL(mmc_abort_tuning); + static int mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode, u8 len) |