From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout-p-101.mailbox.org (mout-p-101.mailbox.org [80.241.56.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E17963815F2; Tue, 13 Jan 2026 09:15:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.151 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768295742; cv=none; b=WrdBUzplm6+wRPcqvUP5PFg3XFrP/i5cD1X7y7s20TP9jVSdw/nszEIDWHMOzIvgNMz18wtSa4e03/02TXU5J569rxUGkY9v5Fn9h6IMFjO9qcM61/PRIFgZ02HJhwuTdbTIFFZSK7x74o4ZH4YvPb3wxQkEfWmteMLzvAzVqTU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768295742; c=relaxed/simple; bh=nIIksL5mUlWdTnTjhPHMrEehI9aA1snjhXPcWS3H0qs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Jk/kbUrKCGrqOECa1ymT3KU/oRP7pLYa2rb0WyWUwFiEeHprwqWvHOxdUF6QSS83YqFGSukcJStscXeO+OaB+eUyDba+Iamczl+9kGQYMNaOi5fCKvJJwgNXgE0/YrkznltAFkmOJksHMTMC42lV3PU2IwHsdzYP/WtgX99OMEc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org; spf=pass smtp.mailfrom=mailbox.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=cP8pqTgt; arc=none smtp.client-ip=80.241.56.151 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mailbox.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="cP8pqTgt" Received: from smtp202.mailbox.org (smtp202.mailbox.org [IPv6:2001:67c:2050:b231:465::202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-101.mailbox.org (Postfix) with ESMTPS id 4dr3Vz5gLqz9sbt; Tue, 13 Jan 2026 10:15:23 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1768295723; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wQ7AtPjQ2Ronaqwmz5J5bM5bR7wWBP2yp8oCfP+eth0=; b=cP8pqTgtxZhtLZglYZrNCDjSY1DlxxBf8Nc39IYaS5vLeGZ1cXqNaQoSAj80RykGRkZZRx clLouFGJSJt5ib18IoC/Lqcp+fZ6N6BYpRVk6sbmfVKqzcQVveZ2Kl4JPsHAoIt6KFIoYy xrNxStCJdEM/niCTkMI003ySVC8b7tUc8nOdoRHs3TXLFF2gxmZZQRXSmY6tiIsApU0vAB q8JkCD69W979TVzpnPuaF6+9A3pDm9rr/ItBkmWbO1RN6FVVygyLgVIgximr7WIE/KpFjh GQV2zrnFkGw97l46Yo6DwRQ1OiUFlYofE5zM4OnS4VQi2BRUotV50vaUfKwZ4w== Message-ID: <9c59661e-98e6-473e-9a5e-b6002048c51a@mailbox.org> Date: Tue, 13 Jan 2026 10:15:16 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [EXT] [PATCH 2/2] drm/bridge: waveshare-dsi: Add support for 1..4 DSI data lanes To: Joseph Guo , dri-devel@lists.freedesktop.org Cc: Andrzej Hajda , Conor Dooley , David Airlie , Jernej Skrabec , Jonas Karlman , Krzysztof Kozlowski , Laurent Pinchart , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Rob Herring , Robert Foss , Simona Vetter , Thomas Zimmermann , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org References: <20260112234834.226128-1-marek.vasut+renesas@mailbox.org> <20260112234834.226128-2-marek.vasut+renesas@mailbox.org> <773b6e43-4f86-4b11-8e6b-a9f2561a75de@nxp.com> <65ccfeb6-4962-4964-be1d-cfb0ed41773e@mailbox.org> <409cdcf0-af9b-4084-845f-d863ad6303c5@nxp.com> Content-Language: en-US From: Marek Vasut In-Reply-To: <409cdcf0-af9b-4084-845f-d863ad6303c5@nxp.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-MBO-RS-META: zhhta6mtoru8d4m813ormdjwi7reu7uu X-MBO-RS-ID: 0283d1e8558795067bf On 1/13/26 9:15 AM, Joseph Guo wrote: > On 1/13/2026 4:04 PM, Marek Vasut wrote: >> [You don't often get email from marek.vasut@mailbox.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] >> >> Caution: This is an external email. Please take care when clicking links or opening attachments. When in doubt, report the message using the 'Report this email' button >> >> >> On 1/13/26 7:41 AM, Joseph Guo wrote: >>> On 1/13/2026 7:47 AM, Marek Vasut wrote: >>>> [You don't often get email from marek.vasut+renesas@mailbox.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] >>>> >>>> Caution: This is an external email. Please take care when clicking links or opening attachments. When in doubt, report the message using the 'Report this email' button >>>> >>>> >>>> Parse the data lane count out of DT. Limit the supported data lanes >>>> to 1..4 which is the maximum available DSI pairs on the connector of >>>> any known panels which may use this bridge. Internally, this bridge >>>> is an ChipOne ICN6211 which loads its register configuration from a >>>> dedicated storage and its I2C does not seem to be accessible. The >>>> ICN6211 also supports up to 4 DSI lanes, so this is a hard limit. >>>> >>>> To avoid any breakage on old DTs where the parsing of data lanes from >>>> DT may fail, fall back to the original hard-coded value of 2 lanes and >>>> warn user. >>>> >>>> The lane configuration is preconfigured in the bridge for each of the >>>> WaveShare panels. The 13.3" DSI panel works with 4-lane configuration, >>>> others seem to use 2-lane configuration. This is a hardware property, >>>> so the actual count should come from DT. >>>> >>>> >>> Hi Marek, >>> >>> I don't have 4 lanes waveshare panel on my hands. Have you tested with the 4-lane panel already? >> Yes, the 13.3" DSI panel is 4-lane >> https://www.waveshare.com/13.3inch-dsi-lcd.htm, I have it connected to >> Retronix Sparrow Hawk board which has 4-lane port. >> >> See also this patch I submitted, that is the DT binding for it: >> >> [PATCH 2/2] arm64: dts: renesas: sparrow-hawk: Add overlay for WaveShare >> Display 13.3" > > OK, thank you. > Reviewed-by: Joseph Guo Thank you too.