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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>
This commit is contained in:
Adrian Hunter 2017-03-13 14:36:37 +02:00 committed by Ulf Hansson
parent 7b410d074b
commit b658af7184
5 changed files with 34 additions and 0 deletions
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1
Documentation/mmc/mmc-dev-attrs.txt
View File

@ -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:

2
drivers/mmc/core/mmc.c
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@ -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);

28
drivers/mmc/core/mmc_ops.c
View File

@ -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);

2
drivers/mmc/core/mmc_ops.h
View File

@ -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

1
include/linux/mmc/card.h
View File

@ -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