diff options
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 3268fcd..16cf6ea 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -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; } |
