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[24.155.109.49]) by smtp.gmail.com with ESMTPSA id c12sm1194876otm.61.2020.09.29.12.00.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Sep 2020 12:00:56 -0700 (PDT) Received: (nullmailer pid 968417 invoked by uid 1000); Tue, 29 Sep 2020 19:00:55 -0000 Date: Tue, 29 Sep 2020 14:00:55 -0500 From: Rob Herring To: Maxime Ripard Subject: Re: [PATCH 1/2] drm/vc4: hdmi: Disable Wifi Frequencies Message-ID: <20200929190055.GA962101@bogus> References: <20200925130744.575725-1-maxime@cerno.tech> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200925130744.575725-1-maxime@cerno.tech> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Tim Gover , Dave Stevenson , David Airlie , dri-devel@lists.freedesktop.org, 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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. > > In such a case, we can either reject entirely the mode, or lower slightly > the pixel frequency to remove the overlap. Let's go for the latter. > > 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(-) > > diff --git a/Documentation/devicetree/bindings/display/brcm,bcm2711-hdmi.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 > > + raspberrypi,disable-wifi-frequencies: > + type: boolean > + description: > > + Should the pixel frequencies in the WiFi frequencies range be > + avoided? Based on googling the issue, perhaps should be a common property? _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel