From: Felix Fietkau <nbd@openwrt.org>
To: Daniel Halperin <dhalperi@cs.washington.edu>
Cc: linux-wireless@vger.kernel.org, linville@tuxdriver.com,
mcgrof@qca.qualcomm.com
Subject: Re: [PATCH 2/9] ath9k_hw: do not override SIFS time for half/quarter channels
Date: Sun, 15 Apr 2012 20:27:30 +0200 [thread overview]
Message-ID: <4F8B1312.2010108@openwrt.org> (raw)
In-Reply-To: <CALSq=BZgn+O2BNq=yAe_g5DAqR7jO3eSX2AcABtWqGUcYjB_qQ@mail.gmail.com>
On 2012-04-15 8:22 PM, Daniel Halperin wrote:
> Felix,
>
> This whole patch series throws the NICs out of spec compliance. For
> instance, page 626 of the 802.11-2007 standard (Table 17-15) says that
> aSIFStime is 32 us in 10 MHz mode and 64 us in 5 MHz mode.
>
> This might be okay to do for certain implementations (as, apparently,
> AR9280/AR9380), but will break compatibility with any device obeying
> the standard instead.
>
> (I wonder that, if this code below still works, then it seems that you
> might not be properly downclocking the chips' reference clock...)
>
> Are you aware there's a standard for this? Why violate it?
I'm aware that there's a standard for it, but if I put in the standard
values, the connection gets unreliable to the point where it's almost
unusable. That's why I chose to use existing products with 5/10 MHz
support as reference instead.
- Felix
next prev parent reply other threads:[~2012-04-15 18:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-15 10:15 [PATCH 1/9] ath9k_hw: use lower rx latency values for half/quarter channels Felix Fietkau
2012-04-15 10:15 ` [PATCH 2/9] ath9k_hw: do not override SIFS time " Felix Fietkau
2012-04-15 10:15 ` [PATCH 3/9] ath9k_hw: set the PHY mode for half/quarter channels on AR9003 Felix Fietkau
2012-04-15 10:15 ` [PATCH 4/9] ath9k_hw: increase symbol overlap window for half/quarter channels Felix Fietkau
2012-04-15 10:15 ` [PATCH 5/9] ath9k_hw: fix and clean up PHY activation delay Felix Fietkau
2012-04-15 10:15 ` [PATCH 6/9] ath9k_hw: increase ACK timeout for half/quarter channels Felix Fietkau
2012-04-15 10:15 ` [PATCH 7/9] ath9k_hw: disable Tx IQ calibration on " Felix Fietkau
2012-04-15 10:15 ` [PATCH 8/9] ath9k_hw: disable fast channel change when changing from/to half/quarter mode Felix Fietkau
2012-04-15 10:15 ` [PATCH 9/9] ath9k_hw: increase tx abort timeout for half/quarter channels Felix Fietkau
2012-04-15 18:22 ` [PATCH 2/9] ath9k_hw: do not override SIFS time " Daniel Halperin
2012-04-15 18:27 ` Felix Fietkau [this message]
2012-04-16 6:30 ` Daniel Halperin
2012-04-16 9:44 ` Felix Fietkau
2012-04-16 13:16 ` Felix Fietkau
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