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>
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@ -30,6 +30,7 @@ All attributes are read-only.
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rel_sectors Reliable write sector count
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ocr Operation Conditions Register
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dsr Driver Stage Register
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cmdq_en Command Queue enabled: 1 => enabled, 0 => not enabled
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Note on Erase Size and Preferred Erase Size:
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@ -790,6 +790,7 @@ MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
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MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
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MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
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MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
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MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
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static ssize_t mmc_fwrev_show(struct device *dev,
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struct device_attribute *attr,
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@ -845,6 +846,7 @@ static struct attribute *mmc_std_attrs[] = {
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&dev_attr_rel_sectors.attr,
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&dev_attr_ocr.attr,
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&dev_attr_dsr.attr,
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&dev_attr_cmdq_en.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(mmc_std);
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@ -838,3 +838,31 @@ int mmc_can_ext_csd(struct mmc_card *card)
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{
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return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
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}
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static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
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{
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u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
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int err;
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if (!card->ext_csd.cmdq_support)
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return -EOPNOTSUPP;
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err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
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val, card->ext_csd.generic_cmd6_time);
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if (!err)
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card->ext_csd.cmdq_en = enable;
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return err;
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}
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int mmc_cmdq_enable(struct mmc_card *card)
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{
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return mmc_cmdq_switch(card, true);
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}
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EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
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int mmc_cmdq_disable(struct mmc_card *card)
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{
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return mmc_cmdq_switch(card, false);
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}
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EXPORT_SYMBOL_GPL(mmc_cmdq_disable);
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@ -46,6 +46,8 @@ int mmc_read_bkops_status(struct mmc_card *card);
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void mmc_start_bkops(struct mmc_card *card, bool from_exception);
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int mmc_can_reset(struct mmc_card *card);
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int mmc_flush_cache(struct mmc_card *card);
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int mmc_cmdq_enable(struct mmc_card *card);
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int mmc_cmdq_disable(struct mmc_card *card);
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#endif
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@ -89,6 +89,7 @@ struct mmc_ext_csd {
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unsigned int boot_ro_lock; /* ro lock support */
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bool boot_ro_lockable;
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bool ffu_capable; /* Firmware upgrade support */
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bool cmdq_en; /* Command Queue enabled */
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bool cmdq_support; /* Command Queue supported */
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unsigned int cmdq_depth; /* Command Queue depth */
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#define MMC_FIRMWARE_LEN 8
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