From nobody Mon Jun 29 18:39:31 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39020C433F5 for ; Fri, 4 Feb 2022 14:33:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359344AbiBDOdn (ORCPT ); Fri, 4 Feb 2022 09:33:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359340AbiBDOdm (ORCPT ); Fri, 4 Feb 2022 09:33:42 -0500 Received: from mail-wm1-x331.google.com (mail-wm1-x331.google.com [IPv6:2a00:1450:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15CB4C06173D for ; Fri, 4 Feb 2022 06:33:42 -0800 (PST) Received: by mail-wm1-x331.google.com with SMTP id v129so1100754wme.2 for ; Fri, 04 Feb 2022 06:33:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=9HRfuw26kbdaIgCIMJCrn0p/ikh8G5VstHoJyqrHzaY=; b=N5GoAcSlGGBJtMEbJ0ukMjcahDwIi6iA2QZkJabB//WJv/G54PfC1Qrfzg7/ZI1TYh GXhH0QCbw+gpq7uTm0dWhu7TcRTYxOcV5k7t/lsc6n2nPvf9RmCPWHgzUrMufrxVAT1G Lsm/WHY6QYMbH7NqBUFUJRx5DCm2DZkKPdQVSIC86woRjsZkuzlUJwbFshTnN4NtWfni 7g1L/qjPxy12sXSFEjZJ3ZERFtzvB35xQ+w8LuY1lSKUAqPW88dNka/ITANmbxgilrhl egqC9SA4Fpv10xkSU1ukvLxU+IEjvuHmqg3MBKOUTv65hnqvE0/FUcvuWcLHrwN3pQ52 jyRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=9HRfuw26kbdaIgCIMJCrn0p/ikh8G5VstHoJyqrHzaY=; b=HkJNGhoH/KvxfXDmhQAgtZyIM2pAfGE/Ifef3EbSBa1yGfccdYOqwH1f1SH5s2Lqlq nZNUolyIVqWklN1lqAlbx0Fxb9jQiUedhKiUEiOMxZ3JLoVEd6vH1hfkTTeePjE94CK8 OV7THpW6w5YLfDVP4jrMY2B0GHWZi5koIpK5LwVD9feNpvM/ReSMdMG9TRfGPrFQvV7e ClTp/rUpleVlsPUaQEISYZ/f1eBl3O6nbZs1WCwTOIFYVS8Hpcp4V2p2fB0IKdXg0eg8 N+ApbDVdWinxzqJ2jSlFpPF7gbEp6sWJm2h5C3mueqk+oYNQQrdAYIEShDr7GHyp6aji UVfQ== X-Gm-Message-State: AOAM530toxF1e3k+2jj/euaCnpB4pYXNJ1ZtiMTzROEWVteshKR8bp1r Uj4TarehrDN0Uw6KPd/mmbVLlQ== X-Google-Smtp-Source: ABdhPJzM7rirBHeEKddHJTpT/8Ll2fTTFTnqEyoWqAVCMisHdXwtzMHwgV7V/Gu8b3v9CLpo+s2nlg== X-Received: by 2002:a1c:4b09:: with SMTP id y9mr2438315wma.159.1643985220416; Fri, 04 Feb 2022 06:33:40 -0800 (PST) Received: from localhost.localdomain ([2001:861:44c0:66c0:3fbe:ff10:110:739]) by smtp.gmail.com with ESMTPSA id p14sm2426053wrr.7.2022.02.04.06.33.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Feb 2022 06:33:39 -0800 (PST) From: Neil Armstrong To: robert.foss@linaro.org Cc: Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, kieran.bingham@ideasonboard.com, biju.das.jz@bp.renesas.com, Neil Armstrong , Kieran Bingham Subject: [PATCH v3] drm/bridge: dw-hdmi: use safe format when first in bridge chain Date: Fri, 4 Feb 2022 15:33:37 +0100 Message-Id: <20220204143337.89221-1-narmstrong@baylibre.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2327; h=from:subject; bh=e5N2iKj5YSVB+9PoyzM1SrjuyNvunszme9UDF4PNMaY=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBh/Tk4oLM2pdcdSB7huyqScnob/k6VvXol8zz9+/KN tCOP+9WJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCYf05OAAKCRB33NvayMhJ0dKGEA C8cPNgB5xfu4qvomB7nSOs2N1+E1x6dlkhbX5Pl6yeV61+6btrGe61Ca8kDv3E/lubtBCDjytFLCyn ot2ZtSgYUbn59l0WyO4fp5eijMILLBg+RFbA54pxb3O0qmHYsEU7Xf6MvULgsUzv30d6Q1BzK3ZhmQ vLYJdjRuCkwHtD+FWgZNfHuL85wLRH9H7VZVsHYM5DvNq1LDZWblU84uhJxa9x1IhH9QNvYWdbudNh MKj2nW9417G4++HwulDwqtI/h/aKGoNVLkM4lPByFQWeSdwjNvDhDAgKIPyr13TTWyFeI6KqPfF1A3 TWXAbdiI7bEnjhmJCfAJENISJ5BfajEcUyhrOQAWMptsL4cVi6HjfvsgJ7fk92Vagt1Nc95yRZ7wbo 1bTnzRW+eTlILZsI+oVc7neJRo7iPwqz4VMbuisNHLCKtU5U2RsAui/aJ3bkqTCN6aZcMMLeWN9jeR 5Sr1981EYsHHYevtwp6rua8Vp7OdaS+OKj8oikCfxhPLf3OvfEXQfejn3G+qVTbzN71qu5i5wvgQqL t9m+gl4nkmJ8zwHcJQRE0LVoIXTexE55U14yiHBdhcw/9T5GxhjHDrcOGerygvHY85iKIdCK4V2TKR 7o1ZuRlo0Ua/FP6wyvXTE3d3eDNII2wzb5RcOErBgidOAqri1TtWNksiq83A== X-Developer-Key: i=narmstrong@baylibre.com; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When the dw-hdmi bridge is in first place of the bridge chain, this means there is no way to select an input format of the dw-hdmi HW component. Since introduction of display-connector, negotiation was broken since the dw-hdmi negotiation code only worked when the dw-hdmi bridge was in last position of the bridge chain or behind another bridge also supporting input & output format negotiation. Commit 7cd70656d128 ("drm/bridge: display-connector: implement bus fmts cal= lbacks") was introduced to make negotiation work again by making display-connector act as a pass-through concerning input & output format negotiation. But in the case where the dw-hdmi is single in the bridge chain, for example on Renesas SoCs, with the display-connector bridge the dw-hdmi is no more single, breaking output format. Reported-by: Biju Das Bisected-by: Kieran Bingham Tested-by: Kieran Bingham Fixes: 7cd70656d128 ("drm/bridge: display-connector: implement bus fmts cal= lbacks"). Signed-off-by: Neil Armstrong Reviewed-by: Robert Foss --- Changes since v2: - Add rob's r-b - Fix invalid Fixes commit hash Changes since v1: - Remove bad fix in dw_hdmi_bridge_atomic_get_input_bus_fmts - Fix typos in commit message drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/br= idge/synopsys/dw-hdmi.c index 54d8fdad395f..97cdc61b57f6 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -2551,8 +2551,9 @@ static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts= (struct drm_bridge *bridge, if (!output_fmts) return NULL; =20 - /* If dw-hdmi is the only bridge, avoid negociating with ourselves */ - if (list_is_singular(&bridge->encoder->bridge_chain)) { + /* If dw-hdmi is the first or only bridge, avoid negociating with ourselv= es */ + if (list_is_singular(&bridge->encoder->bridge_chain) || + list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain)) { *num_output_fmts =3D 1; output_fmts[0] =3D MEDIA_BUS_FMT_FIXED; =20 --=20 2.25.1