[PATCH V4 06/11] mmc: mmc: Enable Command Queuing

Adrian Hunter
2017-07-21T09:56:39Z

Enable the Command Queue if the host controller supports i a command queue
engine. It is not compatible with Packed Commands, so do not enable that
at the same time.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/core/mmc.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 4ffea14b7eb6..2ff0caf92bc8 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1783,6 +1783,20 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
}

+ /* Enable Command Queue if supported */
+ 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
@@ -1796,7 +1810,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
*/
if (card->ext_csd.max_packed_writes >= 3 &&
card->ext_csd.max_packed_reads >= 5 &&
- host->caps2 & MMC_CAP2_PACKED_CMD) {
+ host->caps2 & MMC_CAP2_PACKED_CMD &&
+ !card->ext_csd.cmdq_en) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_EXP_EVENTS_CTRL,
EXT_CSD_PACKED_EVENT_EN,
--
1.9.1