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 13896C982FD for ; Mon, 21 Sep 2026 15:54:12 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=A37lvk2K4kvKDIjEQaFWtxje/hLDqdNIP4aYihLpCOA=; b=WlA/Ngm+wPmJSEaV7beFjJyDmD HHLoL4CjGrQ3MpWFm0hrY/X9kb0hqUDmMnZwetaLuCXRB+IqDrOUl6pJ+g5Vhlxl4vFpTM/qCjOb3 Bbn6djknXmnFZh/dH6cy+4JUe6CL8iqGnk9ODp7Uncx4lIXrhWJhePpcKKgnzJ/g33nC7hy3MpWQW LXkteZNjsAKOr9csMr2YDwqhdk6gmjX5zFToVjoDdiYTILZMt2Rua8TgZ2uVZH11q8kShTWYyhBb7 Xh8qtxePMbp7AQYrAeurPUlFZc3tuco0IBuBoRw3SHX+PW+rQvzJZ/bPNxum9uhD0FA3xdieYg4Dv jcHz1dSQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8gLC-00000002i2J-40ed; Mon, 21 Sep 2026 15:54:02 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8gKv-00000002hoO-1EcR; Mon, 21 Sep 2026 15:53:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Cc:To:In-Reply-To:References: Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Sender:Reply-To:Content-ID:Content-Description; bh=A37lvk2K4kvKDIjEQaFWtxje/hLDqdNIP4aYihLpCOA=; b=mznQQZ3wkNI/B3hE3hU8Ez1A3i lmhDbfPXNNewcgb42E3/+TJnmtET5jqCHN9Xm+qcnvDpU0deqT4X/fn0uv2p7deoH9PmWU+MJJrTH X5R+hIKqMFfNyceGuAN04x9/lgYblzouv5BJpIh0rGqzLkEFKjdcdK/ROfFRpULj/HwO8jgC6iFHl S9cA9GwZGioBjMlVmrCH/N8SC7Ldr+966wl1MO5vlLYt3UPXd6BMLUstOaFOVb+q87INlGhBrSZqx EWOVMUC3uGMklawg73al+0xkkSaLJHCJhzMy5fl8Gy4E4wZ/yIJAGmA8H+LpLcoyiYev5Y06gnepy egZpwINA==; Received: from sender4-pp-f112.zoho.com ([136.143.188.112]) by desiato.infradead.org with esmtps (Exim 4.99.2 #2 (Red Hat Linux)) id 1x8gKr-0000000CVRl-1gOq; Mon, 21 Sep 2026 15:53:43 +0000 ARC-Seal: i=1; a=rsa-sha256; t=1790005973; cv=none; d=zohomail.com; s=zohoarc; b=KwU0MvN9TIqpzV48EIVHG5F1HhDllVYkeXB3229n+SkrqogUBlq6S9Xe00OwHtVFBuXJj/uJO4J+/6r2Ag/1bwjSCFTtc6O4WjUjKoB9a9N6vOp+ytK6c2FICBGElS3vVciYhJVKSlnX3flUc0EzeOKPVl9sgnrJ+1vsGAi//m4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1790005973; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=A37lvk2K4kvKDIjEQaFWtxje/hLDqdNIP4aYihLpCOA=; b=PbqlYUF+Zvl3FGv7ItmwO2PiaxxqZiPWWKmb4fQ7kiyIXS4/V+d+VV3ZDsX0AtICpZopEzKL+vwmKoe5LoxOGevpk+T46LG3JAjNb/Tr2x1+U8/8Mc6Xh3/vQmYSRHyxFBFyaYzTaJPkkAYqcjzH2GvYkIRnZ74Td727/a63BaI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1790005973; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=A37lvk2K4kvKDIjEQaFWtxje/hLDqdNIP4aYihLpCOA=; b=NWS8s+//mfEFTrVR4p3kwSFSobcD+KUYqBd+Ckn1TlqEtQyMPU+FzLo51YECtZTN /o08VKT+AmRYkEay4XR8R0tPkQdU80OZIYY1E+bazrEX42TbQFjHrAkPO2xh6Dp7MFV mBHjUVK5v+ruHKeIfLt9Dzm68w9K9Q43oeDk2S0k= Received: by smtp.zohomail.com with SMTPS id 1790005971883349.0752585694669; Mon, 21 Sep 2026 08:52:51 -0700 (PDT) From: Nicolas Frattaroli Date: Mon, 21 Sep 2026 17:51:35 +0200 Subject: [PATCH RFC 09/25] drm/connector: Add drm_display_info_is_vrr_capable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260921-vrr-limiter-uapi-v1-9-2fcd7d011646@collabora.com> References: <20260921-vrr-limiter-uapi-v1-0-2fcd7d011646@collabora.com> In-Reply-To: <20260921-vrr-limiter-uapi-v1-0-2fcd7d011646@collabora.com> To: "Borah, Chaitanya Kumar" , Leo Li , Daniel Stone , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Helge Deller , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com, Derek Foreman , wayland-devel@lists.freedesktop.org, Nicolas Frattaroli X-Mailer: b4 0.15.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260921_165341_926923_E0E7BF38 X-CRM114-Status: GOOD ( 11.74 ) 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 Add a function to return whether a sink, as described by a drm_display_info struct, is capable of receiving VRR signals. For HDMI sinks, this can just check the HDMI specific vrr_capable field, which is set by the EDID parsing code. For other types of displays, the generally agreed-upon method appears to be to check whether the monitor range's minimum frequency is above 0. Signed-off-by: Nicolas Frattaroli --- drivers/gpu/drm/drm_connector.c | 19 +++++++++++++++++++ include/drm/drm_connector.h | 2 ++ 2 files changed, 21 insertions(+) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index d94c86bfed86..fc7d9fcf9d9f 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -1378,6 +1378,25 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info, } EXPORT_SYMBOL(drm_display_info_set_bus_formats); +/** + * drm_display_info_is_vrr_capable - Check whether sink is VRR capable + * @info: pointer to a &struct drm_display_info representing the sink + * + * Check whether the sink supports variable refresh rate signals. + * + * Returns: + * - true if variable refresh rate is supported by the sink + * - false otherwise + */ +bool drm_display_info_is_vrr_capable(const struct drm_display_info *info) +{ + if (info->is_hdmi) + return info->hdmi.vrr_capable; + + return info->monitor_range.min_vfreq > 0; +} +EXPORT_SYMBOL(drm_display_info_is_vrr_capable); + /* Optional connector properties. */ static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = { { DRM_MODE_SCALE_NONE, "None" }, diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 6e431eb81705..b18684d039d5 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1072,6 +1072,8 @@ int drm_display_info_set_bus_formats(struct drm_display_info *info, const u32 *formats, unsigned int num_formats); +bool drm_display_info_is_vrr_capable(const struct drm_display_info *info); + /** * struct drm_connector_tv_margins - TV connector related margins * -- 2.55.0