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wl1271: Add pre-power-on sleep

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This patch adds a short delay before powering on the wl1271. Normally, it is
not needed, but if the wl1271 has been powered off shortly before, for reliable
firmware-booting this small stabilization delay is required.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Juuso Oikarinen 2009-12-11 15:41:02 +02:00 committed by John W. Linville
parent 9ccd921792
commit 01ac17ecb6
2 changed files with 4 additions and 1 deletions
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4
drivers/net/wireless/wl12xx/wl1271.h
View file

@ -458,7 +458,9 @@ int wl1271_plt_stop(struct wl1271 *wl);
#define WL1271_TX_QUEUE_MAX_LENGTH 20
/* WL1271 needs a 200ms sleep after power on */
/* WL1271 needs a 200ms sleep after power on, and a 20ms sleep before power
on in case is has been shut down shortly before */
#define WL1271_PRE_POWER_ON_SLEEP 20 /* in miliseconds */
#define WL1271_POWER_ON_SLEEP 200 /* in miliseconds */
static inline bool wl1271_11a_enabled(void)

1
drivers/net/wireless/wl12xx/wl1271_main.c
View file

@ -618,6 +618,7 @@ static int wl1271_chip_wakeup(struct wl1271 *wl)
struct wl1271_partition_set partition;
int ret = 0;
msleep(WL1271_PRE_POWER_ON_SLEEP);
wl1271_power_on(wl);
msleep(WL1271_POWER_ON_SLEEP);
wl1271_spi_reset(wl);