From 9ccd921792e5b6719ff9e561438e095cba757727 Mon Sep 17 00:00:00 2001 From: Juuso Oikarinen Date: Fri, 11 Dec 2009 15:41:01 +0200 Subject: [PATCH] wl1271: Implement chipset boot retry The wl1271 has a hardware bug which causes it to randomly (very infrequently) to fail powering up properly. This patch implements retry for the chipset boot sequence, to work around the hardware problem. Signed-off-by: Juuso Oikarinen Reviewed-by: Luciano Coelho Signed-off-by: Luciano Coelho Signed-off-by: John W. Linville --- drivers/net/wireless/wl12xx/wl1271_main.c | 130 +++++++++++++--------- 1 file changed, 77 insertions(+), 53 deletions(-) diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c index d07f03565196..0795bf3c60da 100644 --- a/drivers/net/wireless/wl12xx/wl1271_main.c +++ b/drivers/net/wireless/wl12xx/wl1271_main.c @@ -47,6 +47,8 @@ #include "wl1271_cmd.h" #include "wl1271_boot.h" +#define WL1271_BOOT_RETRIES 3 + static struct conf_drv_settings default_conf = { .sg = { .per_threshold = 7500, @@ -645,7 +647,7 @@ static int wl1271_chip_wakeup(struct wl1271 *wl) ret = wl1271_setup(wl); if (ret < 0) - goto out_power_off; + goto out; break; case CHIP_ID_1271_PG20: wl1271_debug(DEBUG_BOOT, "chip id 0x%x (1271 PG20)", @@ -653,38 +655,34 @@ static int wl1271_chip_wakeup(struct wl1271 *wl) ret = wl1271_setup(wl); if (ret < 0) - goto out_power_off; + goto out; break; default: - wl1271_error("unsupported chip id: 0x%x", wl->chip.id); + wl1271_warning("unsupported chip id: 0x%x", wl->chip.id); ret = -ENODEV; - goto out_power_off; + goto out; } if (wl->fw == NULL) { ret = wl1271_fetch_firmware(wl); if (ret < 0) - goto out_power_off; + goto out; } /* No NVS from netlink, try to get it from the filesystem */ if (wl->nvs == NULL) { ret = wl1271_fetch_nvs(wl); if (ret < 0) - goto out_power_off; + goto out; } - goto out; - -out_power_off: - wl1271_power_off(wl); - out: return ret; } int wl1271_plt_start(struct wl1271 *wl) { + int retries = WL1271_BOOT_RETRIES; int ret; mutex_lock(&wl->mutex); @@ -698,35 +696,48 @@ int wl1271_plt_start(struct wl1271 *wl) goto out; } - wl->state = WL1271_STATE_PLT; - - ret = wl1271_chip_wakeup(wl); - if (ret < 0) - goto out; - - ret = wl1271_boot(wl); - if (ret < 0) - goto out_power_off; - - wl1271_notice("firmware booted in PLT mode (%s)", wl->chip.fw_ver); + while (retries) { + retries--; + ret = wl1271_chip_wakeup(wl); + if (ret < 0) + goto power_off; - ret = wl1271_plt_init(wl); - if (ret < 0) - goto out_irq_disable; + ret = wl1271_boot(wl); + if (ret < 0) + goto power_off; - /* Make sure power saving is disabled */ - ret = wl1271_acx_sleep_auth(wl, WL1271_PSM_CAM); - if (ret < 0) - goto out_irq_disable; + ret = wl1271_plt_init(wl); + if (ret < 0) + goto irq_disable; - goto out; + /* Make sure power saving is disabled */ + ret = wl1271_acx_sleep_auth(wl, WL1271_PSM_CAM); + if (ret < 0) + goto irq_disable; -out_irq_disable: - wl1271_disable_interrupts(wl); + wl->state = WL1271_STATE_PLT; + wl1271_notice("firmware booted in PLT mode (%s)", + wl->chip.fw_ver); + goto out; -out_power_off: - wl1271_power_off(wl); +irq_disable: + wl1271_disable_interrupts(wl); + mutex_unlock(&wl->mutex); + /* Unlocking the mutex in the middle of handling is + inherently unsafe. In this case we deem it safe to do, + because we need to let any possibly pending IRQ out of + the system (and while we are WL1271_STATE_OFF the IRQ + work function will not do anything.) Also, any other + possible concurrent operations will fail due to the + current state, hence the wl1271 struct should be safe. */ + cancel_work_sync(&wl->irq_work); + mutex_lock(&wl->mutex); +power_off: + wl1271_power_off(wl); + } + wl1271_error("firmware boot in PLT mode failed despite %d retries", + WL1271_BOOT_RETRIES); out: mutex_unlock(&wl->mutex); @@ -882,6 +893,7 @@ static struct notifier_block wl1271_dev_notifier = { static int wl1271_op_start(struct ieee80211_hw *hw) { struct wl1271 *wl = hw->priv; + int retries = WL1271_BOOT_RETRIES; int ret = 0; wl1271_debug(DEBUG_MAC80211, "mac80211 start"); @@ -895,30 +907,42 @@ static int wl1271_op_start(struct ieee80211_hw *hw) goto out; } - ret = wl1271_chip_wakeup(wl); - if (ret < 0) - goto out; - - ret = wl1271_boot(wl); - if (ret < 0) - goto out_power_off; - - ret = wl1271_hw_init(wl); - if (ret < 0) - goto out_irq_disable; - - wl->state = WL1271_STATE_ON; + while (retries) { + retries--; + ret = wl1271_chip_wakeup(wl); + if (ret < 0) + goto power_off; - wl1271_info("firmware booted (%s)", wl->chip.fw_ver); + ret = wl1271_boot(wl); + if (ret < 0) + goto power_off; - goto out; + ret = wl1271_hw_init(wl); + if (ret < 0) + goto irq_disable; -out_irq_disable: - wl1271_disable_interrupts(wl); + wl->state = WL1271_STATE_ON; + wl1271_info("firmware booted (%s)", wl->chip.fw_ver); + goto out; -out_power_off: - wl1271_power_off(wl); +irq_disable: + wl1271_disable_interrupts(wl); + mutex_unlock(&wl->mutex); + /* Unlocking the mutex in the middle of handling is + inherently unsafe. In this case we deem it safe to do, + because we need to let any possibly pending IRQ out of + the system (and while we are WL1271_STATE_OFF the IRQ + work function will not do anything.) Also, any other + possible concurrent operations will fail due to the + current state, hence the wl1271 struct should be safe. */ + cancel_work_sync(&wl->irq_work); + mutex_lock(&wl->mutex); +power_off: + wl1271_power_off(wl); + } + wl1271_error("firmware boot failed despite %d retries", + WL1271_BOOT_RETRIES); out: mutex_unlock(&wl->mutex); -- 2.39.5