[PATCH v2 1/1] nvme: disable CC.CRIME (NVME_CC_CRIME)

[gjoyce at linux.ibm.com]

From: Greg Joyce <gjoyce at linux.ibm.com>

Disable NVME_CC_CRIME so that CSTS.RDY indicates that the media
is ready and able to handle commands without returning
NVME_SC_ADMIN_COMMAND_MEDIA_NOT_READY.

Signed-off-by: Greg Joyce <gjoyce at linux.ibm.com>
---
 drivers/nvme/host/core.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ba6508455e18..10eca7660ca7 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2458,8 +2458,13 @@ int nvme_enable_ctrl(struct nvme_ctrl *ctrl)
 	else
 		ctrl->ctrl_config = NVME_CC_CSS_NVM;
 
-	if (ctrl->cap & NVME_CAP_CRMS_CRWMS && ctrl->cap & NVME_CAP_CRMS_CRIMS)
-		ctrl->ctrl_config |= NVME_CC_CRIME;
+	/*
+	 * Setting CRIME results in CSTS.RDY before the media is ready. This
+	 * make it possible for media related commands to return the error
+	 * NVME_SC_ADMIN_COMMAND_MEDIA_NOT_READY. Until the driver is
+	 * restructurade to handle retries, disable CC.CRIME.
+	 */
+	ctrl->ctrl_config &= ~NVME_CC_CRIME;
 
 	ctrl->ctrl_config |= (NVME_CTRL_PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT;
 	ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
@@ -2489,10 +2494,7 @@ int nvme_enable_ctrl(struct nvme_ctrl *ctrl)
 		 * devices are known to get this wrong. Use the larger of the
 		 * two values.
 		 */
-		if (ctrl->ctrl_config & NVME_CC_CRIME)
-			ready_timeout = NVME_CRTO_CRIMT(crto);
-		else
-			ready_timeout = NVME_CRTO_CRWMT(crto);
+		ready_timeout = NVME_CRTO_CRWMT(crto);
 
 		if (ready_timeout < timeout)
 			dev_warn_once(ctrl->device, "bad crto:%x cap:%llx\n",
-- 
gjoyce at linux.ibm.com