From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=62.149.155.116 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794003135; b=FNaS+/lvVy3CDFsHiJDj/JEZ+QKwYk20GiRCGwdw5NyZ1n3mjYYIa8wz8+rC/IlBM1+I kokNuaJxGpLty+JDlPOlJWkVBJkDv9poD3WGFRG1RIHXiZ7f8RlUb5EpxNUXNcmbuzUra pPDWxag89kD8oWaesrtKmiqtsceouKuGDxrTnN+GOgM75N6IWtSbZgUrL7tacyi3t5EyI Ju2v+gyIh3hr0SWq6tPvxIDZLosKCBUNsR6oQYjpS5whwnOgWFv6oXC1AqtZiYT6zzbmO jUPAi25UEjc6KuGgG15u3pM3j8Kz07AWzEBVi2GzuzoG3pPC4S5k62vNfXUPXBn8HJg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794003135; h=DMARC-Filter:Received:DKIM-Signature:Date:From:To:Cc:Subject: Message-ID:In-Reply-To:References:X-Mailer:MIME-Version:Content-Type: Content-Transfer-Encoding:X-CMAE-Envelope; bh=mJl+RwDvzq/PplYN8DwtJmtkz00zrmcGgZgazx8qzZ4=; b=3iGNPqTRm6TarXMBJQa9MfnPtMAbBRIQWcEr1CYPIqS8aBbboP1ITy4FYN/KoUvIKavl ck2ctQrqik1CYVLYQr4rfT60aX1aELh+yyMtnq4I4/+W6UF9q3BHq/+9K65WrP9q61xVw WWE3qtFQPYpE1sLVOV4hDlc3irVXwyrPpzPw2zisYMi5p7/dEqNfDCV8pdqVIZ4X+MSPG TQ9HXUEPN4SXvCBsvu0vt3uqUBQiYZjgBxXH+Og9ph5Wr2Qr4n8EFvFXJ396QmAmWjw48 lL2ZeBL4TbBC0GmDHXNizL//vf4L4X029zGTfNx6BPK7LEhGuFOZ0X32wLJS9RC2Euw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=mythread.it; spf=pass smtp.mailfrom=mythread.it; dkim=pass header.d=mythread.it header.i=@mythread.it header.a=rsa-sha256 header.s=a1 header.b=b4fM4jZx; arc=none smtp.remote-ip=62.149.155.116 Received: from smtpdh17-1.aruba.it (smtpdh17-1.aruba.it [62.149.155.116]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 875D9606A32C for ; Fri, 6 Nov 2026 22:12:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 875D9606A32C Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mythread.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mythread.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=mythread.it header.i=@mythread.it header.a=rsa-sha256 header.s=a1 header.b=b4fM4jZx Received: from localhost ([87.16.49.252]) by Aruba SMTP with ESMTPSA id PSAFxplkKkeHhPSAFxTcEj; Fri, 06 Nov 2026 23:12:03 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mythread.it; s=a1; t=1794003123; bh=ZGt9E16nzykH9Ajz1azleSM2KOUHnN9gragopg2dc48=; h=Date:From:To:Subject:MIME-Version:Content-Type; b=b4fM4jZx+A/efqkwy3m4W7yXmO7VPj6iFpgE5yfAkjIsyHQ1RGp3bLEFs5eXkt7Wx F4zoejSXHRsvsUaBYQ6J3b5EB5Lx/1NasmaXywN0fBb7Xh8vL7iVSZqMlI5PfWT5T9 t1V9wIIyBS9uUlWwPhPdDVayi8PDXNb9QURGspgAgWZCYhPC33qzLNvoZPW+2V8TID WVr9FzQwxp+P44xrZpmKqn9ruY18HwtvV9Q5gYOz5rEasZVER8l19dME9KFa/dR3Sq tzVo5k+++di1Vllz7VmvLPHIL+g6Xu2oSBTnn1h+Q3HOh5J4IRJ+Yu/MmHO2HiBA3W UqKR46w8Y+Tjg== Date: Fri, 6 Nov 2026 23:12:02 +0100 From: Alessio Ferri To: Luca Casati Cc: linux-wireless@vger.kernel.org, johannes@sipsolutions.net, arend.vanspriel@broadcom.com, b43-dev@lists.infradead.org Subject: Re: [PATCH wireless-next v2 1/5] b43: N-PHY: fix the TX tone sample table Message-ID: <20261106231202.00004c8b@mythread.it> In-Reply-To: <20261106211516.273791-2-luk00casati@gmail.com> References: <20261106211516.273791-1-luk00casati@gmail.com> <20261106211516.273791-2-luk00casati@gmail.com> X-Mailer: Claws Mail 3.21.0 (GTK+ 2.24.33; x86_64-w64-mingw32) X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4xfBi88QmP7VZAFmeKmyOG6wE2hjbZ7XwFngFelYV3CKcWoMyOno4/el0tga/zV3LFCWEajCIbm4rQlPv1JiaDTSBnJ3BSe8aHTkCkqeiVUx72/2Db3Sa9 s9BrBjb2MuNsQTXu+q2l4fkMDiQ5oaXtfTHBIK16cPc5VVwV8ox0OtDD4D87M7Rj69PL9Ku/R7uez/gpMY3eR3sgu9UVE5F3WAl3UttFijRdEHw2sWUQufnS Hl/x/nomOeoS9SeTpTavqCiZx74UfKpf79UZSgcRNqqEHQGh9z1x3fRzb+QaUyuZO4f5PeGPvS5w8Rj+oUGZ1zjTEt+z4JltgL5ui4TexLoFGNGnoUNxHJQJ /+QUhC8Y Il giorno Fri, 6 Nov 2026 22:15:12 +0100 Luca Casati ha scritto: > b43_nphy_load_samples() masked with (0x3FF << 10) instead of shifting > the masked I value, and b43_nphy_gen_load_samples() fed > cordic_calc_iq() a 16.16 fixed-point angle (CORDIC_FIXED() of a value > already shifted by 16) held in a u16, while the function takes whole > degrees. Together the sample table ended up all zeros, so every > calibration that plays a test tone (TX IQ/LO, RX IQ) ran without a > signal. > > Compute the rotation in whole degrees as brcmsmac does and fix the > precedence. > > Tested on a BCM43228 (N-PHY rev 16, radio 2057 rev 9). > > mmiotraces: https://github.com/Luca00casati/b43patch/blob/755c2d8/traces/excerpts/patch1-tone-table.txt > > Found and fixed with the help of an AI coding assistant (Claude Opus > 5.5), by comparing mmiotraces of b43 and wl on the same card. > > Signed-off-by: Luca Casati > --- > drivers/net/wireless/broadcom/b43/phy_n.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/wireless/broadcom/b43/phy_n.c > b/drivers/net/wireless/broadcom/b43/phy_n.c index > bbc30cbad..c4e6c1ac0 100644 --- > a/drivers/net/wireless/broadcom/b43/phy_n.c +++ > b/drivers/net/wireless/broadcom/b43/phy_n.c @@ -1515,7 +1515,7 @@ > static int b43_nphy_load_samples(struct b43_wldev *dev, > b43_nphy_stay_in_carrier_search(dev, 1); > for (i = 0; i < len; i++) { > - data[i] = (samples[i].i & 0x3FF << 10); > + data[i] = (samples[i].i & 0x3FF) << 10; > data[i] |= samples[i].q & 0x3FF; > } True, this is a precedence mistake, the shift binds before the masking. > b43_ntab_write_bulk(dev, B43_NTAB32(17, 0), len, data); > @@ -1531,7 +1531,8 @@ static u16 b43_nphy_gen_load_samples(struct > b43_wldev *dev, u32 freq, u16 max, bool test) > { > int i; > - u16 bw, len, rot, angle; > + u16 bw, len; > + s32 rot, angle; > struct cordic_iq *samples; > > bw = b43_is_40mhz(dev) ? 40 : 20; > @@ -1554,11 +1555,11 @@ static u16 b43_nphy_gen_load_samples(struct > b43_wldev *dev, u32 freq, u16 max, b43err(dev->wl, "allocation for > samples generation failed\n"); return 0; > } > - rot = (((freq * 36) / bw) << 16) / 100; > + rot = ((freq * 36) / bw) / 100; > angle = 0; > Correct, although changing the type of rot is not strictly needed. > for (i = 0; i < len; i++) { > - samples[i] = cordic_calc_iq(CORDIC_FIXED(angle)); > + samples[i] = cordic_calc_iq(angle); > angle += rot; > samples[i].q = CORDIC_FLOAT(samples[i].q * max); > samples[i].i = CORDIC_FLOAT(samples[i].i * max); cordic_calc_iq calls CORDIC_FIXED(theta) as the first operation, so in the original code that would be equivalent to CORDIC_FIXED( CORDIC_FIXED(angle) ), which is zero. Reviewed-by: Alessio Ferri Regards Alessio