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 5FDB8C982F8 for ; Mon, 21 Sep 2026 15:53:17 +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=ytG9EVMPqKl2Mw9Xbxf4dujO3AFiJ9cigwIohDH1vlA=; b=TODtcs4eTnKTn5aH0elxf0L2m1 9lppFoeBfLzWYrtMy544JTY0OHKeEvasMZOOj4SSr/JsQZ6uSq1crKfOP27skMmmUD9mDWMMWAUzM 6ykQ9pbI8K4FlFSDxfzlVVS8Oc74S2LkznLimRuNEto3HohFbepKJ+B5JT+zVx2XfDO/b5a22je3J Y8Z75IQohbimIiJyimOUB+m0FTA9lh8k/6nWQL8ngt++q8qV+uxRubE4Gi7gPT69rKjdta/+ja5vw veV7F48tbp8qrEYhjw4M0+Kj0LjuW7znt97FJfF9z1sPp8H7i8lISimNf9aMsSwicXjwtqzwkB8ZG VBiS4DhQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8gKJ-00000002hFn-3x8i; Mon, 21 Sep 2026 15:53:07 +0000 Received: from sender4-pp-f112.zoho.com ([136.143.188.112]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8gKB-00000002h8v-03lq; Mon, 21 Sep 2026 15:53:00 +0000 ARC-Seal: i=1; a=rsa-sha256; t=1790005929; cv=none; d=zohomail.com; s=zohoarc; b=Ml3smdYUlqSH1mc6vbEi4yTO3jB8SQVOP3F5f7I0Sm7/CgNHUOqB6wbBfHlFhYXrh0DEPWTR1gWA9Yf5Mdvbc4mHAY2uPYwHSc5GaZNA8p09CWciJ53xvIr8ssVE8z+O7IDCoVNnP/H+480BENWeAaLtxrmmtGzg9YGzHl9P89A= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1790005929; 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=ytG9EVMPqKl2Mw9Xbxf4dujO3AFiJ9cigwIohDH1vlA=; b=n2Ey+GF00mNbV9T77/DBajAOOcuV6t+CHyWyqkBNaL3MBXGttwujwgM/kM3Z5EVzL7P2Kk7RSA/a/idHnLOMdqCcufg6eXolwQf6+o1WPRbMfSQtHxz0/0aJ6SKCJBlYtFLGkVBdMBDtT2F/6sqpFepvXTCTNy/FKfaC/A7ndbM= 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=1790005929; 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=ytG9EVMPqKl2Mw9Xbxf4dujO3AFiJ9cigwIohDH1vlA=; b=gU8WwUFLpF1njrpENtAeLn9Je+89Y8DPu3LgczqOAd13iQ0DKPP/lMLfYOhGfLxD GjPUDSVLgBHWOgY9eGj15EgzocYYk2LfctCYNU13ft1oC7MzTYxBeOJFbOC+RdiVzCx J5MeO74szXzSbK08Cpgl+psIsvYdxXxIQlNKBTUs= Received: by smtp.zohomail.com with SMTPS id 1790005926723132.8117967235828; Mon, 21 Sep 2026 08:52:06 -0700 (PDT) From: Nicolas Frattaroli Date: Mon, 21 Sep 2026 17:51:27 +0200 Subject: [PATCH RFC 01/25] drm/edid: Add a query for vrr range MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260921-vrr-limiter-uapi-v1-1-2fcd7d011646@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_085259_132504_95A98473 X-CRM114-Status: GOOD ( 11.31 ) 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 From: Derek Foreman Query the minimum and maximum VRR vertical rates from EDID. Signed-off-by: Derek Foreman Signed-off-by: Nicolas Frattaroli --- drivers/gpu/drm/drm_edid.c | 26 ++++++++++++++++++++++++++ include/drm/drm_connector.h | 3 +++ 2 files changed, 29 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 3148038747b6..a1494028e0f5 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -6309,6 +6309,25 @@ static void drm_parse_dsc_info(struct drm_hdmi_dsc_cap *hdmi_dsc, hdmi_dsc->total_chunk_kbytes = hf_scds[13] & DRM_EDID_DSC_TOTAL_CHUNK_KBYTES; } +static void drm_parse_vrr_info(struct drm_display_info *info, const u8 *hf_scds) +{ + struct drm_monitor_range_info *range = &info->monitor_range; + const int pld_len = cea_db_payload_len(hf_scds); + + if (pld_len < 10) + return; + + if (!range->min_vfreq) + range->min_vfreq = FIELD_GET(DRM_EDID_VRR_MIN_MASK, hf_scds[9]); + + if (pld_len < 11) + return; + + if (!range->max_vfreq) + range->max_vfreq = (FIELD_GET(DRM_EDID_VRR_MAX_UPPER_MASK, hf_scds[9]) << 8) | + hf_scds[10]; +} + /* Sink Capability Data Structure */ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector, const u8 *hf_scds) @@ -6371,6 +6390,13 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector, dsc_support = true; } + drm_parse_vrr_info(info, hf_scds); + + if (info->monitor_range.min_vfreq > 0) + hdmi->vrr_capable = true; + else + hdmi->vrr_capable = false; + drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] HF-VSDB: max TMDS clock: %d KHz, HDMI 2.1 support: %s, DSC 1.2 support: %s\n", connector->base.id, connector->name, diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 2ee7c59329aa..593fbeaffa16 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -380,6 +380,9 @@ struct drm_hdmi_info { /** @dsc_cap: DSC capabilities of the sink */ struct drm_hdmi_dsc_cap dsc_cap; + + /** @vrr_capable: The sink supports variable refresh rate */ + bool vrr_capable; }; /** -- 2.55.0