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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 0BF2CCCA470 for ; Thu, 9 Oct 2025 03:15:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=iABHohkXXscty3ygSSBQiwpr5DtvMO/CY8j782HEq18=; b=xpJgk6VQoCDdcT5AfUIKvlfIM2 TiQVvAbOnUlQT0Y4xE7zA65FLJCFU75VNREhL5z8Ginson1yKX1VVfuwZ4orouku9GgX3GJKffInV TmpUCaSvWJ9Hb4s9hBaUcm6JFBXUHCX7x1j0AKiSf084U1mpL2nH3al8wQCbWnJIVSYGDO8yW6ETf FiUAjepO2rWKQ8kVChTk6M0XgKEhs4S4TFZl7b7oSj2FPFc0gbanT/MlpgdS7JTcDT4+mWfotHkq/ ohW+2vmKuMGhrgoUVKzam7fy4BC5xu0XI9ATF7tKyTfsukKJt6tAWBiaqqzg/vypHr5wL4JCYDYb1 vXgPIs8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v6h7i-000000055HH-0Uek; Thu, 09 Oct 2025 03:15:22 +0000 Received: from mail-m32108.qiye.163.com ([220.197.32.108]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v6h7e-000000055Gl-26hz; Thu, 09 Oct 2025 03:15:21 +0000 Received: from [172.16.12.26] (unknown [58.22.7.114]) by smtp.qiye.163.com (Hmail) with ESMTP id 2540f1755; Thu, 9 Oct 2025 11:15:12 +0800 (GMT+08:00) Message-ID: <600da5e2-da28-429b-ba7a-6ddabeeb044d@rock-chips.com> Date: Thu, 9 Oct 2025 11:15:13 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 11/18] drm/display: bridge_connector: Ensure last bridge determines EDID/modes detection capabilities To: Dmitry Baryshkov Cc: andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, inki.dae@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, krzk@kernel.org, alim.akhtar@samsung.com, jingoohan1@gmail.com, p.zabel@pengutronix.de, hjc@rock-chips.com, heiko@sntech.de, andy.yan@rock-chips.com, dianders@chromium.org, m.szyprowski@samsung.com, luca.ceresoli@bootlin.com, jani.nikula@intel.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org References: <20250930090920.131094-1-damon.ding@rock-chips.com> <20250930090920.131094-12-damon.ding@rock-chips.com> <4r25h5uaamfkprrmvrtdqfjlcgcnkfyca2o5q53hteta7rlrbq@xqlrjxhi7z2u> Content-Language: en-US From: Damon Ding In-Reply-To: <4r25h5uaamfkprrmvrtdqfjlcgcnkfyca2o5q53hteta7rlrbq@xqlrjxhi7z2u> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-HM-Tid: 0a99c6f72dc603a3kunmfe4252c4a5c7bd X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFDSUNOT01LS0k3V1ktWUFJV1kPCRoVCBIfWUFZGhgfT1ZMGkxMTE1KSUtCTB5WFRQJFh oXVRMBExYaEhckFA4PWVdZGBILWUFZTkNVSUlVTFVKSk9ZV1kWGg8SFR0UWUFZT0tIVUpLSEpKQk 1VSktLVUpCWQY+ DKIM-Signature: a=rsa-sha256; b=iQs0T/oMZ2uhdZcdybDbf32wCENpnpEDgP3/4nIpyZchoiqx101XIqUFLuYnQ8IcKx4Znl6ZyzkvOgsZ4UWhvqaSNB33nuRn9W/w1YboaMZpZdr5IObRzog7tr1A8nYt2b/3iKtdXeVXmfBjPuu7pX24s1jtIDZnRMVvEGAEOEc=; c=relaxed/relaxed; s=default; d=rock-chips.com; v=1; bh=iABHohkXXscty3ygSSBQiwpr5DtvMO/CY8j782HEq18=; h=date:mime-version:subject:message-id:from; X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251008_201519_779193_E3E8AA2F X-CRM114-Status: GOOD ( 12.57 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Dmitry, On 10/1/2025 4:21 AM, Dmitry Baryshkov wrote: > On Tue, Sep 30, 2025 at 05:09:13PM +0800, Damon Ding wrote: >> When multiple bridges are present, EDID detection capability >> (DRM_BRIDGE_OP_EDID) takes precedence over modes detection >> (DRM_BRIDGE_OP_MODES). To ensure the above two capabilities are >> determined by the last bridge in the chain, we handle three cases: >> >> Case 1: The later bridge declares only DRM_BRIDGE_OP_MODES >> - If the previous bridge declares DRM_BRIDGE_OP_EDID, set >> &drm_bridge_connector.bridge_edid to NULL and set >> &drm_bridge_connector.bridge_modes to the later bridge. >> - Ensure modes detection capability of the later bridge will not >> be ignored. >> >> Case 2: The later bridge declares only DRM_BRIDGE_OP_EDID >> - If the previous bridge declares DRM_BRIDGE_OP_MODES, set >> &drm_bridge_connector.bridge_modes to NULL and set >> &drm_bridge_connector.bridge_edid to the later bridge. >> - Although EDID detection capability has higher priority, this >> operation is for balance and makes sense. >> >> Case 3: the later bridge declares both of them >> - Assign later bridge as &drm_bridge_connector.bridge_edid and >> and &drm_bridge_connector.bridge_modes to this bridge. >> - Just leave transfer of these two capabilities as before. >> >> Signed-off-by: Damon Ding >> Suggested-by: Dmitry Baryshkov >> --- >> .../gpu/drm/display/drm_bridge_connector.c | 42 +++++++++++++++++++ >> 1 file changed, 42 insertions(+) >> > > Reviewed-by: Dmitry Baryshkov > > But I'd suggest pulling this to a top of the series to let others also > take a look at it. > Will do in v7. Best regards, Damon