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 C81D6C6FD19 for ; Mon, 13 Mar 2023 08:08:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230408AbjCMIIz (ORCPT ); Mon, 13 Mar 2023 04:08:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229688AbjCMIIk (ORCPT ); Mon, 13 Mar 2023 04:08:40 -0400 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F56915172 for ; Mon, 13 Mar 2023 01:06:57 -0700 (PDT) Received: by mail-wr1-x432.google.com with SMTP id o7so996814wrg.5 for ; Mon, 13 Mar 2023 01:06:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1678694812; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to; bh=9T+gkmJSh/A2WDenopQxXDLhV/ur6paK/JrT18X4nWg=; b=Iv2G+78gmnXK8UQXnG5coj7nchQy0urUJWA33kXXuQCkEHq0M8FyQVkN9fuD3d/Lxz oz7w8I4FDjvTlXPGpV0pu6GAyV/JtBXyAUEHwpZgC7TPrI5W7CpKUwPifVBWfzulZMvt UseUIx6NL6dsyRGuyYmqz7d5kuC0by3WjL4QimOraxJXHBUh/Lct2FtU1RjVjMs/HVhx Jx6QteCrEAMRnK0UfN63xCVZCW55Xgq97f1A1sLzcTqvyJZrL/95+ChN8oZPJbVkiEpp bKA5wN1wvxvLWFKFT7TYp6wyxS5wSZ+dW0R+ZkUAQFO7B2ftfkgxFoP5Gtc8Pffkt0Iq wjYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678694812; h=content-transfer-encoding:in-reply-to:organization:references:cc:to :content-language:subject:reply-to:from:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=9T+gkmJSh/A2WDenopQxXDLhV/ur6paK/JrT18X4nWg=; b=ZSM5gwwrkuKT0TqsYCNdf7WhxJ5DsrdMuqZzpOXG+GE7NZqZEtdrKIlX3dIqUsttgf /2vNOG6PWL/AZFcaRkngGVmyC0V5uS3xCu+Qu2HUGfD0d1vG6tftqyKUbRtYW5o/JYEG pI1NrwFWaEVgVA7WPHkPe/HVXbKloVyQjDGdxLd/dxFo2HJZpijLJRuZg34eaReoWTML G1dU1/wcoaUBZLqRvmk2+7Fh9Q0wcWpcgZvxOYIVawwQ4sY2L7FlMLaojhh1MLa1Qoxj 3PcpUMBzEjwUCK9nFLKArodVFbeKPjQjeQ2DbnMj5fLIlbzUIohuYNbNI5a4lODmG1au TTbQ== X-Gm-Message-State: AO0yUKUQrGPPuBqb7JnBNg/wiAB9hxzzp4Ey8mvwAcJ5op98xOXXMm1a ynQfHNeyBl+D7dR3qv2CT3R/dQ== X-Google-Smtp-Source: AK7set+szlV9cCWtDnSfEmND682iNy8nj0kpvAQc7fC4DpuzG1k9PBJAPBfXxESaTRweKTfRFyKB6Q== X-Received: by 2002:adf:ee90:0:b0:2c8:9cfe:9e29 with SMTP id b16-20020adfee90000000b002c89cfe9e29mr20978010wro.38.1678694812121; Mon, 13 Mar 2023 01:06:52 -0700 (PDT) Received: from [192.168.7.111] (679773502.box.freepro.com. [212.114.21.58]) by smtp.gmail.com with ESMTPSA id x1-20020adff641000000b002c70c99db74sm7124861wrp.86.2023.03.13.01.06.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Mar 2023 01:06:51 -0700 (PDT) Message-ID: <6c02557d-372d-05b1-2998-7c2cde99fac7@linaro.org> Date: Mon, 13 Mar 2023 09:06:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2 From: Neil Armstrong Reply-To: neil.armstrong@linaro.org Subject: Re: [PATCH v5 2/2] drm/panel: Add driver for Novatek NT36523 Content-Language: en-US To: Jianhua Lu , Konrad Dybcio Cc: Thierry Reding , Sam Ravnborg , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Linus Walleij , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org References: <20230311123231.20771-1-lujianhua000@gmail.com> <20230311123231.20771-2-lujianhua000@gmail.com> <904bc493-7160-32fd-9709-1dcb978ddbab@linaro.org> Organization: Linaro Developer Services In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/03/2023 13:46, Jianhua Lu wrote: > On Sat, Mar 11, 2023 at 01:38:52PM +0100, Konrad Dybcio wrote: >> >> >> On 11.03.2023 13:32, Jianhua Lu wrote: >>> Add a driver for panels using the Novatek NT36523 display driver IC. >>> >>> Signed-off-by: Jianhua Lu >>> --- >> [...] >> >>> + >>> +static int nt36523_get_modes(struct drm_panel *panel, >>> + struct drm_connector *connector) >>> +{ >>> + struct panel_info *pinfo = to_panel_info(panel); >>> + int i; >>> + >>> + for (i = 0; i < pinfo->desc->num_modes; i++) { >>> + const struct drm_display_mode *m = &pinfo->desc->modes[i]; >>> + struct drm_display_mode *mode; >>> + >>> + mode = drm_mode_duplicate(connector->dev, m); >>> + if (!mode) { >>> + dev_err(panel->dev, "failed to add mode %ux%u@%u\n", >>> + m->hdisplay, m->vdisplay, drm_mode_vrefresh(m)); >>> + return -ENOMEM; >>> + } >>> + >>> + mode->type = DRM_MODE_TYPE_DRIVER; >>> + if (pinfo->desc->num_modes == 1) >>> + mode->type |= DRM_MODE_TYPE_PREFERRED; >> That's not quite correct, as that means "if you have more than one >> defined panel mode (say 60Hz and 120 Hz), there will be no preferred one". > This piece of code I see in the other panels, so I'm not sure if it is > correct. Should > if (pinfo->desc->num_modes > 1) > mode->type |= DRM_MODE_TYPE_PREFERRED; > is correct? I think only a single mode with DRM_MODE_TYPE_PREFERRED is preferred, so: if (i == 0) mode->type |= DRM_MODE_TYPE_PREFERRED; would be the right thing to do. Neil >> >> Konrad >>>