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openwrt-xburst/package/mac80211/patches/201-ath5k-WAR-for-AR71xx-PCI-bug.patch
nbd 10b359c8c9 mac80211: Improve ath5k/ar71xx PCI bug WAR
It has been confirmed by Atheros that this PCI bug affects the RX side only,
so we can keep the 128B DMA size for TX.

With this change we can double the thruput of ath5k from 15Mps to 30Mbps.

We have been using this patch since more than 6 month in a production
environment without problems and a significant performance improvement.

It has also been said to fix HW encryption:
http://www.mail-archive.com/ath5k-devel@lists.ath5k.org/msg04311.html

Patch from: kentarou matsuyama <matsuyama@thinktube.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25104 3c298f89-4303-0410-b956-a3cf2f4a3e73
2011-01-26 11:33:50 +00:00

39 lines
1.2 KiB
Diff

--- a/drivers/net/wireless/ath/ath5k/initvals.c
+++ b/drivers/net/wireless/ath/ath5k/initvals.c
@@ -58,8 +58,14 @@ static const struct ath5k_ini ar5210_ini
{ AR5K_IMR, 0 },
{ AR5K_IER, AR5K_IER_DISABLE },
{ AR5K_BSR, 0, AR5K_INI_READ },
+#ifndef CONFIG_ATHEROS_AR71XX
{ AR5K_TXCFG, AR5K_DMASIZE_128B },
{ AR5K_RXCFG, AR5K_DMASIZE_128B },
+#else
+ /* WAR for AR71xx PCI bug */
+ { AR5K_TXCFG, AR5K_DMASIZE_128B },
+ { AR5K_RXCFG, AR5K_DMASIZE_4B },
+#endif
{ AR5K_CFG, AR5K_INIT_CFG },
{ AR5K_TOPS, 8 },
{ AR5K_RXNOFRM, 8 },
--- a/drivers/net/wireless/ath/ath5k/dma.c
+++ b/drivers/net/wireless/ath/ath5k/dma.c
@@ -787,10 +787,18 @@ void ath5k_hw_dma_init(struct ath5k_hw *
* guess we can tweak it and see how it goes ;-)
*/
if (ah->ah_version != AR5K_AR5210) {
+#ifndef CONFIG_ATHEROS_AR71XX
AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_128B);
AR5K_REG_WRITE_BITS(ah, AR5K_RXCFG,
AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_128B);
+#else
+ /* WAR for AR71xx PCI bug */
+ AR5K_REG_WRITE_BITS(ah, AR5K_TXCFG,
+ AR5K_TXCFG_SDMAMR, AR5K_DMASIZE_128B);
+ AR5K_REG_WRITE_BITS(ah, AR5K_RXCFG,
+ AR5K_RXCFG_SDMAMW, AR5K_DMASIZE_4B);
+#endif
}
/* Pre-enable interrupts on 5211/5212*/