hpi_time_threshold can be set to configure elapsed time in ms,
after which an ongoing request will not be preempted.
Explain the hpi_time_threhold parameter for MMC devices.

Signed-off-by: Venkatraman S <svenkatr@ti.com>
---
 Documentation/ABI/testing/sysfs-devices-mmc |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-devices-mmc b/Documentation/ABI/testing/sysfs-devices-mmc
index 5a50ab6..133dba5 100644
--- a/Documentation/ABI/testing/sysfs-devices-mmc
+++ b/Documentation/ABI/testing/sysfs-devices-mmc
@@ -19,3 +19,15 @@ Description:
 		is enabled, this attribute will indicate the size of enhanced
 		data area. If not, this attribute will be -EINVAL.
 		Unit KByte. Format decimal.
+
+What:		/sys/devices/.../mmc_host/mmcX/mmcX:XXXX/hpi_time_threshold
+Date:		April 2012
+Contact:	Venkatraman S <svenkatr@ti.com>
+Description:
+		High Priority Interrupt is a new feature defined in eMMC4.4
+		standard. If this feature is enabled, stack needs to decide
+		till what time since the last issued request is considered
+		preemptible. This attribute value (in milliseconds) is
+		used for arriving at the most optimal value for a specific
+		card. Default is zero, which also disables the feature, as
+		the request becomes non-preemptible immediately.
-- 
1.7.10.rc2