From nobody Sun Dec 14 06:16:16 2025 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 8244CC433FE for ; Mon, 3 Oct 2022 07:27:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231221AbiJCH10 (ORCPT ); Mon, 3 Oct 2022 03:27:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229678AbiJCH00 (ORCPT ); Mon, 3 Oct 2022 03:26:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D6064BD1C; Mon, 3 Oct 2022 00:18:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4EB4060F08; Mon, 3 Oct 2022 07:18:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 587CCC433C1; Mon, 3 Oct 2022 07:18:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664781528; bh=v7g4F4OSPeaZNOBmVwP/wUNFNVZYgcHERgCo9de8d90=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WpQcoaUxjWFJubczK4ryFwuQqSEGR6K+FVagBi8bq+01PWFU47iJC39bdneghUIkD pypE23fap4+oBWzrsZzQgRz09xzO9relst+GquLoBrb03xHc2RqxNU/TIswevuzjyh ep2ecP5P0flTrd8ED9c5fiCLF/jmsKIClxFAgF3Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Francesco Dolcini , Philippe Schenker , Adrien Grassein , Neil Armstrong , Sasha Levin Subject: [PATCH 5.15 52/83] drm/bridge: lt8912b: fix corrupted image output Date: Mon, 3 Oct 2022 09:11:17 +0200 Message-Id: <20221003070723.305982375@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221003070721.971297651@linuxfoundation.org> References: <20221003070721.971297651@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Francesco Dolcini [ Upstream commit 051ad2788d35ca07aec8402542e5d38429f2426a ] Correct I2C address for the register list in lt8912_write_lvds_config(), these registers are on the first I2C address (0x48), the current function is just writing garbage to the wrong registers and this creates multiple issues (artifacts and output completely corrupted) on some HDMI displays. Correct I2C address comes from Lontium documentation and it is the one used on other out-of-tree LT8912B drivers [1]. [1] https://github.com/boundarydevices/linux/blob/boundary-imx_5.10.x_2.0.0= /drivers/video/lt8912.c#L296 Fixes: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge") Signed-off-by: Francesco Dolcini Signed-off-by: Philippe Schenker Acked-by: Adrien Grassein Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20220922124306.34729-4-= dev@pschenker.ch Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/lontium-lt8912b.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bri= dge/lontium-lt8912b.c index 6e04d51b4636..82169b6bfca1 100644 --- a/drivers/gpu/drm/bridge/lontium-lt8912b.c +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c @@ -186,7 +186,7 @@ static int lt8912_write_lvds_config(struct lt8912 *lt) {0x03, 0xff}, }; =20 - return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(se= q)); + return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); }; =20 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) --=20 2.35.1