From 062caf43d803771b660defe6b147711d8b730364 Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Mon, 12 Jun 2006 17:02:22 +0200 Subject: [PATCH] [PATCH] bcm43xx: suspend MAC while executing long pwork Suspend MAC (and make MAC-suspend refcounting) when doing long periodic work. On long periodic work, we disable IRQs on the device, so we don't want the MAC to stay operating and probably miss packets due do non-delivery of interrupts. Signed-off-by: Michael Buesch Signed-off-by: John W. Linville --- drivers/net/wireless/bcm43xx/bcm43xx.h | 2 + drivers/net/wireless/bcm43xx/bcm43xx_main.c | 49 +++++++++++++-------- 2 files changed, 33 insertions(+), 18 deletions(-) diff --git a/drivers/net/wireless/bcm43xx/bcm43xx.h b/drivers/net/wireless/bcm43xx/bcm43xx.h index ee6571ed706d..bee84b58060c 100644 --- a/drivers/net/wireless/bcm43xx/bcm43xx.h +++ b/drivers/net/wireless/bcm43xx/bcm43xx.h @@ -737,6 +737,8 @@ struct bcm43xx_private { u32 irq_savedstate; /* Link Quality calculation context. */ struct bcm43xx_noise_calculation noisecalc; + /* if > 0 MAC is suspended. if == 0 MAC is enabled. */ + int mac_suspended; /* Threshold values. */ //TODO: The RTS thr has to be _used_. Currently, it is only set via WX. diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_main.c b/drivers/net/wireless/bcm43xx/bcm43xx_main.c index ab3a0ee9fac8..1af330d496fc 100644 --- a/drivers/net/wireless/bcm43xx/bcm43xx_main.c +++ b/drivers/net/wireless/bcm43xx/bcm43xx_main.c @@ -2298,13 +2298,17 @@ static int bcm43xx_gpio_cleanup(struct bcm43xx_private *bcm) /* http://bcm-specs.sipsolutions.net/EnableMac */ void bcm43xx_mac_enable(struct bcm43xx_private *bcm) { - bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, - bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD) - | BCM43xx_SBF_MAC_ENABLED); - bcm43xx_write32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON, BCM43xx_IRQ_READY); - bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD); /* dummy read */ - bcm43xx_read32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON); /* dummy read */ - bcm43xx_power_saving_ctl_bits(bcm, -1, -1); + bcm->mac_suspended--; + assert(bcm->mac_suspended >= 0); + if (bcm->mac_suspended == 0) { + bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, + bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD) + | BCM43xx_SBF_MAC_ENABLED); + bcm43xx_write32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON, BCM43xx_IRQ_READY); + bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD); /* dummy read */ + bcm43xx_read32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON); /* dummy read */ + bcm43xx_power_saving_ctl_bits(bcm, -1, -1); + } } /* http://bcm-specs.sipsolutions.net/SuspendMAC */ @@ -2313,18 +2317,23 @@ void bcm43xx_mac_suspend(struct bcm43xx_private *bcm) int i; u32 tmp; - bcm43xx_power_saving_ctl_bits(bcm, -1, 1); - bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, - bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD) - & ~BCM43xx_SBF_MAC_ENABLED); - bcm43xx_read32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON); /* dummy read */ - for (i = 100000; i; i--) { - tmp = bcm43xx_read32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON); - if (tmp & BCM43xx_IRQ_READY) - return; - udelay(10); + assert(bcm->mac_suspended >= 0); + if (bcm->mac_suspended == 0) { + bcm43xx_power_saving_ctl_bits(bcm, -1, 1); + bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, + bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD) + & ~BCM43xx_SBF_MAC_ENABLED); + bcm43xx_read32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON); /* dummy read */ + for (i = 100000; i; i--) { + tmp = bcm43xx_read32(bcm, BCM43xx_MMIO_GEN_IRQ_REASON); + if (tmp & BCM43xx_IRQ_READY) + goto out; + udelay(10); + } + printkl(KERN_ERR PFX "MAC suspend failed\n"); } - printkl(KERN_ERR PFX "MAC suspend failed\n"); +out: + bcm->mac_suspended++; } void bcm43xx_set_iwmode(struct bcm43xx_private *bcm, @@ -3183,7 +3192,9 @@ static void bcm43xx_periodic_work_handler(void *d) * be preemtible. */ netif_stop_queue(bcm->net_dev); + synchronize_net(); spin_lock_irqsave(&bcm->irq_lock, flags); + bcm43xx_mac_suspend(bcm); if (bcm43xx_using_pio(bcm)) bcm43xx_pio_freeze_txqueues(bcm); savedirqs = bcm43xx_interrupt_disable(bcm, BCM43xx_IRQ_ALL); @@ -3207,6 +3218,7 @@ static void bcm43xx_periodic_work_handler(void *d) bcm43xx_interrupt_enable(bcm, savedirqs); if (bcm43xx_using_pio(bcm)) bcm43xx_pio_thaw_txqueues(bcm); + bcm43xx_mac_enable(bcm); } netif_wake_queue(bcm->net_dev); } @@ -3820,6 +3832,7 @@ static int bcm43xx_init_private(struct bcm43xx_private *bcm, bcm->softmac->set_channel = bcm43xx_ieee80211_set_chan; bcm->irq_savedstate = BCM43xx_IRQ_INITIAL; + bcm->mac_suspended = 1; bcm->pci_dev = pci_dev; bcm->net_dev = net_dev; bcm->bad_frames_preempt = modparam_bad_frames_preempt; -- GitLab