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[31.178.127.80]) by smtp.gmail.com with ESMTPSA id q12-20020a056512210c00b00489daae997fsm355423lfr.10.2022.07.10.10.01.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Jul 2022 10:01:21 -0700 (PDT) Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) Subject: Re: [PATCH v11 20/24] arm64: dts: rockchip: enable vop2 and hdmi tx on rock-3a From: Piotr Oniszczuk In-Reply-To: Date: Sun, 10 Jul 2022 19:01:17 +0200 Cc: Sascha Hauer , Michael Riesch , dri-devel@lists.freedesktop.org, "linux-arm-kernel@lists.infradead.org" , "open list:ARM/Rockchip SoC..." , "devicetree@vger.kernel.org" , kernel@pengutronix.de, Andy Yan , Benjamin Gaignard , Sandy Huang , =?utf-8?Q?Heiko_St=C3=BCbner?= , kernel test robot Message-Id: References: <20220422072841.2206452-1-s.hauer@pengutronix.de> <20220422072841.2206452-21-s.hauer@pengutronix.de> <0E6FE020-C95E-47CF-A9D6-AC3F2B2D334F@gmail.com> <9F2D8CFF-1EAE-4586-9EE9-82A9D67840BB@gmail.com> <9567EECF-A154-4FE1-A03C-5ED080409030@gmail.com> <190C3FD3-0185-4A99-B10E-A5790047D993@gmail.com> <0D8B18A1-82FD-4902-A443-AD774DE43DAD@gmail.com> To: Peter Geis X-Mailer: Apple Mail (2.3654.120.0.1.13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220710_100124_959468_C86BE9DC X-CRM114-Status: GOOD ( 10.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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[31.178.127.80]) by smtp.gmail.com with ESMTPSA id q12-20020a056512210c00b00489daae997fsm355423lfr.10.2022.07.10.10.01.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Jul 2022 10:01:21 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) Subject: Re: [PATCH v11 20/24] arm64: dts: rockchip: enable vop2 and hdmi tx on rock-3a From: Piotr Oniszczuk In-Reply-To: Date: Sun, 10 Jul 2022 19:01:17 +0200 Cc: Sascha Hauer , Michael Riesch , dri-devel@lists.freedesktop.org, "linux-arm-kernel@lists.infradead.org" , "open list:ARM/Rockchip SoC..." , "devicetree@vger.kernel.org" , kernel@pengutronix.de, Andy Yan , Benjamin Gaignard , Sandy Huang , =?utf-8?Q?Heiko_St=C3=BCbner?= , kernel test robot Content-Transfer-Encoding: quoted-printable Message-Id: References: <20220422072841.2206452-1-s.hauer@pengutronix.de> <20220422072841.2206452-21-s.hauer@pengutronix.de> <0E6FE020-C95E-47CF-A9D6-AC3F2B2D334F@gmail.com> <9F2D8CFF-1EAE-4586-9EE9-82A9D67840BB@gmail.com> <9567EECF-A154-4FE1-A03C-5ED080409030@gmail.com> <190C3FD3-0185-4A99-B10E-A5790047D993@gmail.com> <0D8B18A1-82FD-4902-A443-AD774DE43DAD@gmail.com> To: Peter Geis X-Mailer: Apple Mail (2.3654.120.0.1.13) Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org > Wiadomo=C5=9B=C4=87 napisana przez Piotr Oniszczuk = w dniu 25.06.2022, o godz. 17:31: >=20 >=20 >=20 >> Wiadomo=C5=9B=C4=87 napisana przez Peter Geis w = dniu 25.06.2022, o godz. 16:00: >>=20 >>=20 >> The first issue you have is the TV isn't responding until the = absolute >> end. >=20 > I suspect this is because lack on idle gaps between cec commands sent = from board to tv. > Maybe TV sw. can't deal with consecutive commands without any idle = between them?=20 >=20 > It is interesting that disconnecting TV - so CEC line is driven only = by board - rock3a still don't have any idle gaps while rock3b (and radxa = 4.19 bsp) has them (very similar between 5.18mailine and 4.19 bsp). >=20 > How this is possible that change I/O from m0->m1 impacts _timings_ on = free hanging CEC line?=20 >=20 >> This strikes me as a signal integrity issue. Do you have an >> oscilloscope (not a logic analyzer, you need voltages and ramp times) >> to compare the working vs non-working signals? Check both sides of = the >> level shifter. >=20 > Indeed - i will verify this with digital oscilloscope.=20 Peter, fyi I got my oscilloscope and do measurements on hdmi cable cec line on: = working rock3b and non-working rock3a. sw was exactly the same (same sd card; only dtb changed) Pls see measurements for: start pulse "0" pulse "1" pulse non-working rock3-a: http://warped.inet2.org/rock3a-one.png http://warped.inet2.org/rock3a-start.png http://warped.inet2.org/rock3a-zero.png working rock3-b http://warped.inet2.org/rock3b-one.png http://warped.inet2.org/rock3b-start.png http://warped.inet2.org/rock3b-zero.png Now i'm 99% sure issue is not hw related but sw (kernel)... br= 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 529F9C433EF for ; Sun, 10 Jul 2022 17:01:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6E3FB14BCFA; Sun, 10 Jul 2022 17:01:24 +0000 (UTC) Received: from mail-lf1-x132.google.com (mail-lf1-x132.google.com [IPv6:2a00:1450:4864:20::132]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6271F14BCF6 for ; Sun, 10 Jul 2022 17:01:23 +0000 (UTC) Received: by mail-lf1-x132.google.com with SMTP id bu42so5328074lfb.0 for ; Sun, 10 Jul 2022 10:01:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=l5KBCfAYsYBJK00LG729DXfB0UnpaT/zELkVvdQsl2k=; b=l4xC2JvKpgguZIekeYks5GBWZNd+nxhscrKPy/iFwlHrX5IHPNR+dg0MkRAGLCLnn4 J/qjx4gCp+iS+3quLxQDXlEs2QWURLHYdt764zfFSCxgGn5GaK0mTuz1JRGHzGKk/D4D 2sJtQ8KjuDQ7CmOf5avdSbC4qNCo6olgDxce1o4eg+hvYB+/fa9potF1u4ejsVHdwLCQ iEpSvBL9vngc4nvqP6ZFdx5/tk6P8jY2XRGSCsE45SU6hvP2qOjMIH65h9Ym2PzoO28H F+3PDTtO1SyY00S2atlgTeBjqk47AEp4IALEacYHMvQkhx9lp7J199Aro/pMfoMFnKxa X/Wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=l5KBCfAYsYBJK00LG729DXfB0UnpaT/zELkVvdQsl2k=; b=T+GTtdqklcbnrqrAs0C8bp0qEP8qBpEwgXYQmQeFMqgYsoy1RldQ1G+qc8Q38t7eFh C9rgnHfAviUXdJKTz6yZ79L/CUMZsbX9AOXpztFfvnWkJNkl6lFXQ+54R9r6YBVKeotr ovaG/Hz8PlKn13Rd8KUecqbUe7///Ag3UKfjKupM5G0UPgYQgfIEYTqBiKaEfDEV5mj3 8eZd5DAVaFiijFfkOg1J4fcvNrry2+TmCzTYA9YumaQq8TD/p5+p77XVn+NnRDTEr0aF fH/0L2kkO4My0t+0nSIETTIZSX5/HGCu0ZHxSdIPhCDEJzsl8Xirjv900mipRCrl+MGU Db3g== X-Gm-Message-State: AJIora+DbONG16FNZ7oRrhO+LhkCdM0+HIAoJYrw624hoG7uuZ/w7iUa o+E3RxZgjv5RRayrpjSQ3SE= X-Google-Smtp-Source: AGRyM1uyIS9oK9Fh8cBxLkbNkrlVHcMu5NngnD6Rs6WSVParGKGEiwgMWhY3lvBxlSFpWCJ4WEn3MA== X-Received: by 2002:a05:6512:505:b0:489:c93d:a95c with SMTP id o5-20020a056512050500b00489c93da95cmr6616045lfb.115.1657472481536; Sun, 10 Jul 2022 10:01:21 -0700 (PDT) Received: from smtpclient.apple (31-178-127-80.dynamic.chello.pl. [31.178.127.80]) by smtp.gmail.com with ESMTPSA id q12-20020a056512210c00b00489daae997fsm355423lfr.10.2022.07.10.10.01.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Jul 2022 10:01:21 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) Subject: Re: [PATCH v11 20/24] arm64: dts: rockchip: enable vop2 and hdmi tx on rock-3a From: Piotr Oniszczuk In-Reply-To: Date: Sun, 10 Jul 2022 19:01:17 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20220422072841.2206452-1-s.hauer@pengutronix.de> <20220422072841.2206452-21-s.hauer@pengutronix.de> <0E6FE020-C95E-47CF-A9D6-AC3F2B2D334F@gmail.com> <9F2D8CFF-1EAE-4586-9EE9-82A9D67840BB@gmail.com> <9567EECF-A154-4FE1-A03C-5ED080409030@gmail.com> <190C3FD3-0185-4A99-B10E-A5790047D993@gmail.com> <0D8B18A1-82FD-4902-A443-AD774DE43DAD@gmail.com> To: Peter Geis X-Mailer: Apple Mail (2.3654.120.0.1.13) 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: "devicetree@vger.kernel.org" , Benjamin Gaignard , Sascha Hauer , Sandy Huang , dri-devel@lists.freedesktop.org, "open list:ARM/Rockchip SoC..." , Michael Riesch , kernel@pengutronix.de, Andy Yan , "linux-arm-kernel@lists.infradead.org" , kernel test robot Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" > Wiadomo=C5=9B=C4=87 napisana przez Piotr Oniszczuk = w dniu 25.06.2022, o godz. 17:31: >=20 >=20 >=20 >> Wiadomo=C5=9B=C4=87 napisana przez Peter Geis w = dniu 25.06.2022, o godz. 16:00: >>=20 >>=20 >> The first issue you have is the TV isn't responding until the = absolute >> end. >=20 > I suspect this is because lack on idle gaps between cec commands sent = from board to tv. > Maybe TV sw. can't deal with consecutive commands without any idle = between them?=20 >=20 > It is interesting that disconnecting TV - so CEC line is driven only = by board - rock3a still don't have any idle gaps while rock3b (and radxa = 4.19 bsp) has them (very similar between 5.18mailine and 4.19 bsp). >=20 > How this is possible that change I/O from m0->m1 impacts _timings_ on = free hanging CEC line?=20 >=20 >> This strikes me as a signal integrity issue. Do you have an >> oscilloscope (not a logic analyzer, you need voltages and ramp times) >> to compare the working vs non-working signals? Check both sides of = the >> level shifter. >=20 > Indeed - i will verify this with digital oscilloscope.=20 Peter, fyi I got my oscilloscope and do measurements on hdmi cable cec line on: = working rock3b and non-working rock3a. sw was exactly the same (same sd card; only dtb changed) Pls see measurements for: start pulse "0" pulse "1" pulse non-working rock3-a: http://warped.inet2.org/rock3a-one.png http://warped.inet2.org/rock3a-start.png http://warped.inet2.org/rock3a-zero.png working rock3-b http://warped.inet2.org/rock3b-one.png http://warped.inet2.org/rock3b-start.png http://warped.inet2.org/rock3b-zero.png Now i'm 99% sure issue is not hw related but sw (kernel)... br=