# Modify SDHC power management states

Modify the following SDHC power management states to optimize power management.

SDHC power management states

| State | Description |
| --- | --- |
| Runtime suspend or resume | <ul class="simple"><br><li><p>The SD card enters the runtime suspend state after 50 ms of inactivity.</p></li><br><li><p>Resume occurs with the next SD card operation. This state is enabled by default and is not configurable.</p></li><br><li><p>The eMMC transitions to the runtime suspend state after 50 milliseconds of inactivity. It resumes with the next I/O operation. This feature is always enabled and cannot be configured.</p></li><br></ul> |
| System suspend or resume | <ul class="simple"><br><li><p>The SD card enters system suspend state with the suspend event.</p></li><br><li><p>SD card system resume state occurs with the system resume event.</p></li><br><li><p>This state is enabled by default and is not configurable.</p></li><br><li><p>The eMMC enters system suspend mode upon receiving a suspend event and resumes operation with a system resume event. This functionality is always enabled and cannot be configured.</p></li><br></ul> |

Last Published: Mar 12, 2026

[Previous Topic
Enable eMMC using device tree properties](https://docs.qualcomm.com/bundle/publicresource/80-80021-6/topics/linux-device-tree.md) [Next Topic
Configure device using UFS parameters](https://docs.qualcomm.com/bundle/publicresource/80-80021-6/topics/bootloader-uefi-device-tree.md)