From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34756C388F9 for ; Thu, 19 Nov 2020 09:20:31 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C0D71221EB for ; Thu, 19 Nov 2020 09:20:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C0D71221EB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 184996E52C; Thu, 19 Nov 2020 09:20:30 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id CA9EC6E526 for ; Thu, 19 Nov 2020 09:20:27 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 61CA6AF93; Thu, 19 Nov 2020 09:20:26 +0000 (UTC) Subject: Re: [PATCH v2 2/3] drm/vc4: hdmi: Disable Wifi Frequencies To: Maxime Ripard , Mark Rutland , Rob Herring , Frank Rowand , Daniel Vetter , David Airlie , Maarten Lankhorst , Eric Anholt References: <20201029134018.1948636-1-maxime@cerno.tech> <20201029134018.1948636-2-maxime@cerno.tech> From: Thomas Zimmermann Message-ID: Date: Thu, 19 Nov 2020 10:20:25 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20201029134018.1948636-2-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: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Tim Gover , Dave Stevenson , dri-devel@lists.freedesktop.org, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Phil Elwell , Nicolas Saenz Julienne Content-Type: multipart/mixed; boundary="===============0637197870==" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============0637197870== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="vHaGzUJMAoIhm7Q9JW302Dfe54rIxQSbv" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --vHaGzUJMAoIhm7Q9JW302Dfe54rIxQSbv Content-Type: multipart/mixed; boundary="tVmd0nbkMF25RRuTvHTWlVIS8xF14uSzo"; protected-headers="v1" From: Thomas Zimmermann To: Maxime Ripard , Mark Rutland , Rob Herring , Frank Rowand , Daniel Vetter , David Airlie , Maarten Lankhorst , Eric Anholt Cc: devicetree@vger.kernel.org, Tim Gover , Dave Stevenson , dri-devel@lists.freedesktop.org, Nicolas Saenz Julienne , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Phil Elwell , linux-arm-kernel@lists.infradead.org Message-ID: Subject: Re: [PATCH v2 2/3] drm/vc4: hdmi: Disable Wifi Frequencies References: <20201029134018.1948636-1-maxime@cerno.tech> <20201029134018.1948636-2-maxime@cerno.tech> In-Reply-To: <20201029134018.1948636-2-maxime@cerno.tech> --tVmd0nbkMF25RRuTvHTWlVIS8xF14uSzo Content-Type: multipart/mixed; boundary="------------A9637589CEBA874E8CD49C61" Content-Language: en-US This is a multi-part message in MIME format. --------------A9637589CEBA874E8CD49C61 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Hi Am 29.10.20 um 14:40 schrieb Maxime Ripard: > 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 >=20 > --- >=20 > Changes from v1: > - Change the name of the property > - Test for a range instead of an exact frequency > --- > drivers/gpu/drm/vc4/vc4_hdmi.c | 21 +++++++++++++++++++++ > drivers/gpu/drm/vc4/vc4_hdmi.h | 8 ++++++++ > 2 files changed, 29 insertions(+) >=20 > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_h= dmi.c > index 506c12454086..0d72e519aec4 100644 > --- a/drivers/gpu/drm/vc4/vc4_hdmi.c > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c > @@ -760,6 +760,9 @@ static void vc4_hdmi_encoder_enable(struct drm_enco= der *encoder) > { > } > =20 > +#define WIFI_2_4GHz_CH1_MIN_FREQ 2400000000ULL > +#define WIFI_2_4GHz_CH1_MAX_FREQ 2422000000ULL > + > static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,= > struct drm_crtc_state *crtc_state, > struct drm_connector_state *conn_state) > @@ -767,12 +770,27 @@ static int vc4_hdmi_encoder_atomic_check(struct d= rm_encoder *encoder, > struct drm_display_mode *mode =3D &crtc_state->adjusted_mode; > struct vc4_hdmi *vc4_hdmi =3D encoder_to_vc4_hdmi(encoder); > unsigned long long pixel_rate =3D mode->clock * 1000; > + unsigned long long tmds_rate; > =20 > if (vc4_hdmi->variant->unsupported_odd_h_timings && > ((mode->hdisplay % 2) || (mode->hsync_start % 2) || > (mode->hsync_end % 2) || (mode->htotal % 2))) > return -EINVAL; > =20 > + /* > + * The 1440p@60 pixel rate is in the same range than the first > + * WiFi channel (between 2.4GHz and 2.422GHz with 22MHz > + * bandwidth). Slightly lower the frequency to bring it out of > + * the WiFi range. > + */ > + tmds_rate =3D pixel_rate * 10; > + if (vc4_hdmi->disable_wifi_frequencies && > + (tmds_rate >=3D WIFI_2_4GHz_CH1_MIN_FREQ && > + tmds_rate <=3D WIFI_2_4GHz_CH1_MAX_FREQ)) { > + mode->clock =3D 238560; > + pixel_rate =3D mode->clock * 1000; > + } > + > if (pixel_rate > vc4_hdmi->variant->max_pixel_clock) > return -EINVAL; > =20 > @@ -1717,6 +1735,9 @@ static int vc4_hdmi_bind(struct device *dev, stru= ct device *master, void *data) > vc4_hdmi->hpd_active_low =3D hpd_gpio_flags & OF_GPIO_ACTIVE_LOW; > } > =20 > + vc4_hdmi->disable_wifi_frequencies =3D > + of_property_read_bool(dev->of_node, "wifi-2.4ghz-coexistence"); > + > pm_runtime_enable(dev); > =20 > drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS); > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_h= dmi.h > index 6815e93b1a48..3843be830601 100644 > --- a/drivers/gpu/drm/vc4/vc4_hdmi.h > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h > @@ -142,6 +142,14 @@ struct vc4_hdmi { > int hpd_gpio; > bool hpd_active_low; > =20 > + /* > + * On some systems (like the RPi4), some modes are in the same > + * frequency range than the WiFi channels (1440p@60Hz for > + * example). Should we take evasive actions because that system > + * has a wifi adapter. The final sentence sounds like a question. Maybe just write 'Take=20 evasive actions if...' Assuming that the display mode still works Acked-by: Thomas Zimmermann > + */ > + bool disable_wifi_frequencies; > + > struct cec_adapter *cec_adap; > struct cec_msg cec_rx_msg; > bool cec_tx_ok; >=20 --=20 Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany (HRB 36809, AG N=C3=BCrnberg) Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer --------------A9637589CEBA874E8CD49C61 Content-Type: application/pgp-keys; name="OpenPGP_0x680DC11D530B7A23.asc" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="OpenPGP_0x680DC11D530B7A23.asc" -----BEGIN PGP PUBLIC KEY BLOCK----- xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdgX= H47 fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0BeB5B= bqP 5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4YchdHm3bkPj= z9E ErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB9GluwvIhSezPg= nEm 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