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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46321C433EF for ; Mon, 6 Dec 2021 21:15:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240456AbhLFVTR (ORCPT ); Mon, 6 Dec 2021 16:19:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350642AbhLFVTC (ORCPT ); Mon, 6 Dec 2021 16:19:02 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E9883C061354; Mon, 6 Dec 2021 13:15:32 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id B2C86B8110F; Mon, 6 Dec 2021 21:15:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4619CC341C6; Mon, 6 Dec 2021 21:15:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638825330; bh=Sa+KGCq2/sHFHnova0dYBBp7RPzJf/V7LKGoUhjeFd0=; h=From:To:Cc:Subject:Date:From; b=X1LIr+6hycVxaRBH2OTHNbb4VIEbr1hOXOXeBWkFtKq5RC1nrkfeOLMiUieKVbrW+ Xz9lImeGp7aai3340OS4dWtOmpni56Vvc8aMxEXsRXxqFZPJC2xJvduY0zH1PUeA6S ldkyCyWSSU3dPPw7SGVPLi6/FThChYyHpAyiOUjsQ+synEPsDkHlfzapOzb62B3QER vM0cVGjfQGJ5gbJydrBTRm7fw1GrM/oV0CjEUfVCdfQ8DUVUltEPDUXRHcM046rJnc NyyqnnUGmiRAwUw86JP30z6pwOcAb+BiB7J0mLRcypwo7UgC7lYpD6uQ+Tu1Wi1gra RztVXPOkDLI8g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Philip Chen , Douglas Anderson , Stephen Boyd , Rob Clark , Sasha Levin , robdclark@gmail.com, sean@poorly.run, airlied@linux.ie, daniel@ffwll.ch, dmitry.baryshkov@linaro.org, abhinavk@codeaurora.org, bjorn.andersson@linaro.org, jonathan@marek.ca, jesszhan@codeaurora.org, vulab@iscas.ac.cn, tiny.windzz@gmail.com, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.10 01/15] drm/msm/dsi: set default num_data_lanes Date: Mon, 6 Dec 2021 16:15:01 -0500 Message-Id: <20211206211520.1660478-1-sashal@kernel.org> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Philip Chen [ Upstream commit cd92cc187c053ab010a1570e2d61d68394a5c725 ] If "data_lanes" property of the dsi output endpoint is missing in the DT, num_data_lanes would be 0 by default, which could cause dsi_host_attach() to fail if dsi->lanes is set to a non-zero value by the bridge driver. According to the binding document of msm dsi controller, the input/output endpoint of the controller is expected to have 4 lanes. So let's set num_data_lanes to 4 by default. Signed-off-by: Philip Chen Reviewed-by: Douglas Anderson Reviewed-by: Stephen Boyd Link: https://lore.kernel.org/r/20211030100812.1.I6cd9af36b723fed277d34539d3b2ba4ca233ad2d@changeid Signed-off-by: Rob Clark Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 96b5dcf8e4540..64454a63bbacf 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -1692,6 +1692,8 @@ static int dsi_host_parse_lane_data(struct msm_dsi_host *msm_host, if (!prop) { DRM_DEV_DEBUG(dev, "failed to find data lane mapping, using default\n"); + /* Set the number of date lanes to 4 by default. */ + msm_host->num_data_lanes = 4; return 0; } -- 2.33.0