[PATCH v3] ath5k: disable ASPM
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From: Maxim Levitsky on 19 Jun 2010 11:40 On Sat, 2010-06-19 at 16:02 +0300, Maxim Levitsky wrote: > On Sat, 2010-06-19 at 08:38 -0400, Bob Copeland wrote: > > On Sat, Jun 19, 2010 at 10:49:34AM +0300, Maxim Levitsky wrote: > > > How this patch? > > > > Looks fine to me. Some nitpicking below but feel free to add my > > > > Acked-by: Bob Copeland <me(a)bobcopeland.com> > > Done. Best regards, Maxim Levitsky --- commit 616afa397b3e843f2aba06be12a30e72dfff7740 Author: Maxim Levitsky <maximlevitsky(a)gmail.com> Date: Thu Jun 17 23:21:42 2010 +0300 ath5k: disable ASPM Atheros card on Acer Aspire One (AOA150, Atheros Communications Inc. AR5001 Wireless Network Adapter [168c:001c] (rev 01)) doesn't work well with ASPM enabled. With ASPM ath5k will eventually stall on heavy traffic with often 'unsupported jumbo' warnings appearing. Disabling ASPM L0s in ath5k fixes these problems. Also card sends a storm of RXORN interrupts even though medium is idle. Reproduced with pcie_aspm=force and by using 'nc < /dev/zero > /dev/null' at both ends (usually stalls within seconds). Unfortunately BIOS enables ASPM on this card by default on these machines This means that, problem shows up (less often) without pcie_aspm=force too. Therefore to benefit from this fix you need to _enable_ CONFIG_PCIEASPM All credit for this patch goes to Jussi Kivilinna <jussi.kivilinna(a)mbnet.fi> for finding and fixing this bug. Based on patch that is From: Jussi Kivilinna <jussi.kivilinna(a)mbnet.fi> Signed-off-by: Maxim Levitsky <maximlevitsky(a)gmail.com> Acked-by: Bob Copeland <me(a)bobcopeland.com> diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c index 3abbe75..4f6bd7c 100644 --- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -48,6 +48,7 @@ #include <linux/netdevice.h> #include <linux/cache.h> #include <linux/pci.h> +#include <linux/pci-aspm.h> #include <linux/ethtool.h> #include <linux/uaccess.h> #include <linux/slab.h> @@ -469,6 +470,19 @@ ath5k_pci_probe(struct pci_dev *pdev, int ret; u8 csz; + /* + * Disable PCIE ASPM L0S on the card. + * ASPM triggers hardware bug, that makes card stall transmission + * untill reset, and even that doesn't always help. + * This happens on meduim to heavy transmit utilization. + * In addition to stall, hardware usually gives a storm of + * RXORN interrupts, despite idle channel, and otherwise doesn't work. + * Windows driver also disables the L0s ASPM, + * probably due to same reason + * Note: to benefit from this fix, please _enable_ CONFIG_PCIEASPM + */ + pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S); + ret = pci_enable_device(pdev); if (ret) { dev_err(&pdev->dev, "can't enable device\n"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |