staging: wfx: use more power-efficient sleep for reset

Replace udelay() with usleep_range() as all uses are in a sleepable context.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Link: https://lore.kernel.org/r/59e1e4e5bd80c1879ef36eaa59916e47005dbb04.1581416843.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/bh.c

@@ -26,7 +26,7 @@ static void device_wakeup(struct wfx_dev *wdev)
 	gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
 	if (wfx_api_older_than(wdev, 1, 4)) {
 		if (!completion_done(&wdev->hif.ctrl_ready))
-			udelay(2000);
+			usleep_range(2000, 2500);
 	} else {
 		// completion.h does not provide any function to wait
 		// completion without consume it (a kind of

drivers/staging/wfx/bus_spi.c

@@ -211,9 +211,9 @@ static int wfx_spi_probe(struct spi_device *func)
 		if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED)
 			gpiod_toggle_active_low(bus->gpio_reset);
 		gpiod_set_value_cansleep(bus->gpio_reset, 1);
-		udelay(100);
+		usleep_range(100, 150);
 		gpiod_set_value_cansleep(bus->gpio_reset, 0);
-		udelay(2000);
+		usleep_range(2000, 2500);
 	}
 
 	INIT_WORK(&bus->request_rx, wfx_spi_request_rx);

drivers/staging/wfx/hwio.c

@@ -142,7 +142,7 @@ static int indirect_read(struct wfx_dev *wdev, int reg, u32 addr, void *buf,
 			goto err;
 		if (!(cfg & prefetch))
 			break;
-		udelay(200);
+		usleep_range(200, 250);
 	}
 	if (i == 20) {
 		ret = -ETIMEDOUT;