From: Rob Herring <robh@kernel.org>
To: Maxime Ripard <maxime@cerno.tech>
Cc: Mark Rutland <mark.rutland@arm.com>,
Frank Rowand <frowand.list@gmail.com>,
Daniel Vetter <daniel.vetter@intel.com>,
David Airlie <airlied@linux.ie>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Eric Anholt <eric@anholt.net>,
devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-rpi-kernel@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
Tim Gover <tim.gover@raspberrypi.com>,
Phil Elwell <phil@raspberrypi.com>
Subject: Re: [PATCH 1/2] drm/vc4: hdmi: Disable Wifi Frequencies
Date: Tue, 29 Sep 2020 14:00:55 -0500 [thread overview]
Message-ID: <20200929190055.GA962101@bogus> (raw)
In-Reply-To: <20200925130744.575725-1-maxime@cerno.tech>
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 <maxime@cerno.tech>
> ---
> .../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?
next prev parent reply other threads:[~2020-09-29 19:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 13:07 [PATCH 1/2] drm/vc4: hdmi: Disable Wifi Frequencies Maxime Ripard
2020-09-25 13:07 ` [PATCH 2/2] ARM: dts: rpi-4: disable wifi frequencies Maxime Ripard
2020-09-28 9:02 ` [PATCH 1/2] drm/vc4: hdmi: Disable Wifi Frequencies Daniel Vetter
2020-09-30 13:03 ` Maxime Ripard
2020-09-29 19:00 ` Rob Herring [this message]
2020-09-30 13:04 ` Maxime Ripard
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