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c=relaxed/relaxed; s=zohomail; d=collabora.com; v=1; bh=sXVdw7vU5ofz/MC7RbWYsGV4+QyERagQ3Me77tggaqA=; h=Content-Description:Content-ID:Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Owner:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Resent-Sender:Resent-Cc:Resent-Date:Resent-To:Reply-To:Resent-Message-ID:Resent-From:Sender:Subject:To:Date:From:Message-Id:Reply-To:Subject:To:Cc; Received: by smtp.zohomail.com with SMTPS id 179389400272574.3566153246461; Thu, 5 Nov 2026 07:53:22 -0800 (PST) From: Nicolas Frattaroli Date: Thu, 05 Nov 2026 16:51:59 +0100 Subject: [PATCH v2 08/27] drm/connector: Add drm_display_info_is_vrr_capable X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261105-vrr-limiter-uapi-v2-8-55f4215be2c2@collabora.com> References: <20261105-vrr-limiter-uapi-v2-0-55f4215be2c2@collabora.com> In-Reply-To: <20261105-vrr-limiter-uapi-v2-0-55f4215be2c2@collabora.com> To: Xaver Hugl , Vidith Madhu , "Borah, Chaitanya Kumar" , Leo Li , Harry Wentland , Fangzhi Zuo , 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 , =?utf-8?q?Michel_D=C3=A4nzer?= 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 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_cap.supported 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 65c14b6e47a6..a44afba8c5ff 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_cap.supported; + + 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 9df745ecff92..5b6920c1a996 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1078,6 +1078,8 @@ 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 * -- 2.56.0