wl1251: Implement delayed entry into ELP mode
Implement (slightly) delayed entry into ELP. This will cure several problems: - It works around a firmware race condition if ELP is entered too fast after commands (resulting in ELP timeout -traces) - It will reduce the number of sleep-wake cycles between already scheduled events such as interrupts and tx, hence improving performance (less delay in switching between RX and TX) Signed-off-by: NJuuso Oikarinen <juuso.oikarinen@nokia.com> Reviewed-by: NVidhya Govindan <vidhya.govindan@nokia.com> Signed-off-by: NKalle Valo <kalle.valo@nokia.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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