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After USB enumeration, some SD card readers do not send signals to the device when the SD card is inserted or removed. To support SD card hotplugging, this patch enables in-kernel media-presence polling, which will check the SD card status every 2 seconds after a SD card reader is attached. Bug: 186479576 Test: SD card insertion/removal and data copy (see b/301566595) Change-Id: I044aeffd9386c0bee6138402e5130c39e1adbc9f Signed-off-by: Kuen-Han Tsai <khtsai@google.com>