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Mon, 5 Oct 2020 11:13:36 -0400 (EDT) Date: Wed, 30 Sep 2020 15:04:59 +0200 To: Rob Herring Subject: Re: [PATCH 1/2] drm/vc4: hdmi: Disable Wifi Frequencies Message-ID: <20200930130459.kfurbu34lc7jeuok@gilmour.lan> From: Maxime Ripard References: <20200925130744.575725-1-maxime@cerno.tech> <20200929190055.GA962101@bogus> MIME-Version: 1.0 In-Reply-To: <20200929190055.GA962101@bogus> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201005_111340_159376_8A266C94 X-CRM114-Status: GOOD ( 20.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Tim Gover , Dave Stevenson , David Airlie , Maarten Lankhorst , dri-devel@lists.freedesktop.org, Eric Anholt , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Thomas Zimmermann , Daniel Vetter , Frank Rowand , Phil Elwell , linux-arm-kernel@lists.infradead.org Content-Type: multipart/mixed; boundary="===============8414842238334427707==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============8414842238334427707== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="u4bs7qtkzx5ibc3n" Content-Disposition: inline --u4bs7qtkzx5ibc3n Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Rob, On Tue, Sep 29, 2020 at 02:00:55PM -0500, Rob Herring wrote: > On Fri, Sep 25, 2020 at 03:07:43PM +0200, Maxime Ripard wrote: > > There's cross-talk on the RPi4 between the 2.4GHz channels used by the = WiFi > > chip and some resolutions, most notably 1440p at 60Hz. > >=20 > > In such a case, we can either reject entirely the mode, or lower slight= ly > > the pixel frequency to remove the overlap. Let's go for the latter. > >=20 > > Signed-off-by: Maxime Ripard > > --- > > .../bindings/display/brcm,bcm2711-hdmi.yaml | 6 ++++++ > > drivers/gpu/drm/vc4/vc4_hdmi.c | 14 +++++++++++++- > > drivers/gpu/drm/vc4/vc4_hdmi.h | 8 ++++++++ > > 3 files changed, 27 insertions(+), 1 deletion(-) > >=20 > > diff --git a/Documentation/devicetree/bindings/display/brcm,bcm2711-hdm= i.yaml b/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml > > index 03a76729d26c..63e7fe999c0a 100644 > > --- a/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml > > +++ b/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.yaml > > @@ -76,6 +76,12 @@ properties: > > resets: > > maxItems: 1 > > =20 > > + raspberrypi,disable-wifi-frequencies: > > + type: boolean > > + description: > > > + Should the pixel frequencies in the WiFi frequencies range be > > + avoided? >=20 > Based on googling the issue, perhaps should be a common property? This is a fairly generic issue indeed, but went for the most non-intrusive way. Do you have a better idea of a generic name, or do you just want me to drop the vendor prefix? Maxime --u4bs7qtkzx5ibc3n Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCX3SCewAKCRDj7w1vZxhR xR6PAP9FsndGYY6v0exCfbGLeQIs4y5yblaoV5yQPygk9VDPOQD9GeC07fLj3UJQ Yph2AlUG43iC5/XHQuxmhu+6Qyigowg= =DlkQ -----END PGP SIGNATURE----- --u4bs7qtkzx5ibc3n-- --===============8414842238334427707== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============8414842238334427707==--