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mmc: mmc: Add Command Queue definitions

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Add definitions relating to Command Queuing.

Signed-off-by: Adrian Hunter <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
This commit is contained in:
Adrian Hunter 2016-11-29 12:09:16 +02:00 • committed by Ulf Hansson
commit 925ff3a7a3
3 changed files with 37 additions and 0 deletions
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18
drivers/mmc/core/mmc.c
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@ -618,6 +618,24 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
(ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
!(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
}
/* eMMC v5.1 or later */
if (card->ext_csd.rev >= 8) {
card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
EXT_CSD_CMDQ_SUPPORTED;
card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
EXT_CSD_CMDQ_DEPTH_MASK) + 1;
/* Exclude inefficiently small queue depths */
if (card->ext_csd.cmdq_depth <= 2) {
card->ext_csd.cmdq_support = false;
card->ext_csd.cmdq_depth = 0;
}
if (card->ext_csd.cmdq_support) {
pr_debug("%s: Command Queue supported depth %u\n",
mmc_hostname(card->host),
card->ext_csd.cmdq_depth);
}
}
out:
return err;
}