[PATCH V9 04/15] mmc: mmc: Enable Command Queuing
From: Adrian Hunter <adrian.hunter@intel.com>
Date: 2017-09-22 12:44:15
Also in:
linux-mmc, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
Enable the Command Queue if the host controller supports a command queue engine. It is not compatible with Packed Commands, so make a note of that in the comment. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> --- drivers/mmc/core/mmc.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 3927157207b9..454a5079a90f 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c@@ -1784,6 +1784,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * Enable Command Queue if supported. Note that Packed Commands cannot + * be used with Command Queue. + */ + card->ext_csd.cmdq_en = false; + if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) { + err = mmc_cmdq_enable(card); + if (err && err != -EBADMSG) + goto free_card; + if (err) { + pr_warn("%s: Enabling CMDQ failed\n", + mmc_hostname(card->host)); + card->ext_csd.cmdq_support = false; + card->ext_csd.cmdq_depth = 0; + err = 0; + } + } + /* * In some cases (e.g. RPMB or mmc_test), the Command Queue must be * disabled for a time, so a flag is needed to indicate to re-enable the * Command Queue.
--
1.9.1