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firmware: add firmware_request_cache() to help with cache on reboot

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Some devices have an optimization in place to enable the firmware to
be retaineed during a system reboot, so after reboot the device can skip
requesting and loading the firmware. This can save up to 1s in load
time. The mt7601u 802.11 device happens to be such a device.

When these devices retain the firmware on a reboot and then suspend
they can miss looking for the firmware on resume. To help with this we
need a way to cache the firmware when such an optimization has taken
place.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luis R. Rodriguez 2018-03-21 15:34:29 -07:00 • committed by Greg Kroah-Hartman
parent c6263a4845
commit 5d42c96e1c
3 changed files with 41 additions and 0 deletions
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3
include/linux/firmware.h
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@ -85,4 +85,7 @@ static inline int request_firmware_into_buf(const struct firmware **firmware_p,
}
#endif
int firmware_request_cache(struct device *device, const char *name);
#endif