mmc: mmc: Add functions to enable / disable the Command Queue

Add helper functions to enable or disable the Command Queue.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/mmc/mmc-dev-attrs.txt b/Documentation/mmc/mmc-dev-attrs.txt
index 404a0e9..dcd1252 100644 (file)
--- a/Documentation/mmc/mmc-dev-attrs.txt
+++ b/Documentation/mmc/mmc-dev-attrs.txt
@@ -30,6 +30,7 @@ All attributes are read-only.
        rel_sectors             Reliable write sector count
        ocr                     Operation Conditions Register
        dsr                     Driver Stage Register
+       cmdq_en                 Command Queue enabled: 1 => enabled, 0 => not enabled
 
 Note on Erase Size and Preferred Erase Size:
 

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index b502601..35b2d0f 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -790,6 +790,7 @@ MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
+MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
 
 static ssize_t mmc_fwrev_show(struct device *dev,
                              struct device_attribute *attr,
@@ -845,6 +846,7 @@ static struct attribute *mmc_std_attrs[] = {
        &dev_attr_rel_sectors.attr,
        &dev_attr_ocr.attr,
        &dev_attr_dsr.attr,
+       &dev_attr_cmdq_en.attr,
        NULL,
 };
 ATTRIBUTE_GROUPS(mmc_std);

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index fe80f26..24c58d2 100644 (file)
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -838,3 +838,31 @@ int mmc_can_ext_csd(struct mmc_card *card)
 {
        return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
 }
+
+static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
+{
+       u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
+       int err;
+
+       if (!card->ext_csd.cmdq_support)
+               return -EOPNOTSUPP;
+
+       err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
+                        val, 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, true);
+}
+EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
+
+int mmc_cmdq_disable(struct mmc_card *card)
+{
+       return mmc_cmdq_switch(card, false);
+}
+EXPORT_SYMBOL_GPL(mmc_cmdq_disable);

diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index 74beea8..978bd2e 100644 (file)
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -46,6 +46,8 @@ int mmc_read_bkops_status(struct mmc_card *card);
 void mmc_start_bkops(struct mmc_card *card, bool from_exception);
 int mmc_can_reset(struct mmc_card *card);
 int mmc_flush_cache(struct mmc_card *card);
+int mmc_cmdq_enable(struct mmc_card *card);
+int mmc_cmdq_disable(struct mmc_card *card);
 
 #endif
 

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 119ef8f..9463779 100644 (file)
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -89,6 +89,7 @@ struct mmc_ext_csd {
        unsigned int            boot_ro_lock;           /* ro lock support */
        bool                    boot_ro_lockable;
        bool                    ffu_capable;    /* Firmware upgrade support */
+       bool                    cmdq_en;        /* Command Queue enabled */
        bool                    cmdq_support;   /* Command Queue supported */
        unsigned int            cmdq_depth;     /* Command Queue depth */
 #define MMC_FIRMWARE_LEN 8