[rt2x00-users] [PATCH] rt2x00: rt2800lib: disable HT40 for now as it causes reception problems
Gertjan van Wingerde
gwingerde at gmail.com
Fri Apr 23 15:21:28 UTC 2010
On 04/23/10 15:05, Helmut Schaa wrote:
> Disable HT40 support for now as it causes rx problems with HT40 capable
> 11n APs (when mac80211 enables HT40, rx is completely disfunctional).
> Once the rt2800 HT code is capable of using HT40 we should enable the
> flag again.
> I only tested this patch with a rt305x SoC device, nevertheless the
> patch disables HT40 also on PCI and USB rt2800 devices.
> Signed-off-by: Helmut Schaa <helmut.schaa at googlemail.com>
I can confirm that this also helps for PCI and USB devices.
With this patch applied all my rt28xx and rt30xx based devices starting working correctly.
Acked-by: Gertjan van Wingerde <gwingerde at gmail.com>
> Using this patch I was able to associate a rt305x SoC device with my 11n
> capable AP using WPA and the connection basically works although I see lots
> of retried frames when sniffing the wireless traffic.
> If someone already had success with rt2800 and HT40 capable APs we should
> consider to only conditionally unset the HT40 flag for 305x SoC devices.
> drivers/net/wireless/rt2x00/rt2800lib.c | 5 ++++-
> 1 files changed, 4 insertions(+), 1 deletions(-)
> diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
> index 2648f31..aa02ff6 100644
> --- a/drivers/net/wireless/rt2x00/rt2800lib.c
> +++ b/drivers/net/wireless/rt2x00/rt2800lib.c
> @@ -2318,8 +2318,11 @@ int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
> spec->ht.ht_supported = false;
> + /*
> + * Don't set IEEE80211_HT_CAP_SUP_WIDTH_20_40 for now as it causes
> + * reception problems with HT40 capable 11n APs
> + */
> spec->ht.cap =
> - IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
> IEEE80211_HT_CAP_GRN_FLD |
> IEEE80211_HT_CAP_SGI_20 |
> IEEE80211_HT_CAP_SGI_40 |
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