Add helper functions to enable or disable the Command Queue.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/mmc/core/mmc_ops.c | 27 +++++++++++++++++++++++++++
include/linux/mmc/core.h | 2 ++
2 files changed, 29 insertions(+)
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index ad6e9798e949..7ec7d62922b0 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -797,3 +797,30 @@ int mmc_can_ext_csd(struct mmc_card *card)
{
return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
}
+
+int mmc_cmdq_switch(struct mmc_card *card, int enable)
+{
+ int err;
+
+ if (!card->ext_csd.cmdq_support)
+ return -EOPNOTSUPP;
+
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
+ enable, card->ext_csd.generic_cmd6_time);
+ if (!err)
+ card->ext_csd.cmdq_en = enable;
+
+ return err;
+}
+
+int mmc_cmdq_enable(struct mmc_card *card)
+{
+ return mmc_cmdq_switch(card, EXT_CSD_CMDQ_MODE_ENABLED);
+}
+EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
+
+int mmc_cmdq_disable(struct mmc_card *card)
+{
+ return mmc_cmdq_switch(card, 0);
+}
+EXPORT_SYMBOL_GPL(mmc_cmdq_disable);
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 368bed70aa9d..63dc01257852 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -161,6 +161,8 @@ extern void mmc_start_bkops(struct mmc_card *card, bool from_exception);
extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);
extern int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error);
extern int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd);
+extern int mmc_cmdq_enable(struct mmc_card *card);
+extern int mmc_cmdq_disable(struct mmc_card *card);
#define MMC_ERASE_ARG 0x00000000
#define MMC_SECURE_ERASE_ARG 0x80000000
--
1.9.1
--
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