From 01ac17ecb6292ceab9bfc498145491b78552b239 Mon Sep 17 00:00:00 2001 From: Juuso Oikarinen <juuso.oikarinen@nokia.com> Date: Fri, 11 Dec 2009 15:41:02 +0200 Subject: [PATCH] wl1271: Add pre-power-on sleep 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> --- drivers/net/wireless/wl12xx/wl1271.h | 4 +++- drivers/net/wireless/wl12xx/wl1271_main.c | 1 + 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/wl12xx/wl1271.h b/drivers/net/wireless/wl12xx/wl1271.h index 81e1c9531a3a4..c965c4a718f36 100644 --- a/drivers/net/wireless/wl12xx/wl1271.h +++ b/drivers/net/wireless/wl12xx/wl1271.h @@ -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) diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c index 0795bf3c60da8..0520b38e8e727 100644 --- a/drivers/net/wireless/wl12xx/wl1271_main.c +++ b/drivers/net/wireless/wl12xx/wl1271_main.c @@ -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); -- 2.30.2