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 751CBE7BDB4 for ; Mon, 16 Feb 2026 13:03:05 +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=goTuCsz9zd4JcRIwXM2LrskUyMJNYiEchG/iLKNBRSQ=; b=UYdqfUXe6MOKbwVI24kLjYriMa MZuQsJHAtMOqu5Ul+dUikp9wysXOkWEa/wriV73TF8VZYl2KZKe5nOq6ELQbLkdiJ7RwusdHgNSt/ PXzG1Z4krL4aqWaVrvWZhIJ33dyD4+o0+hDbXMDmrg52HJBS7n5s66faNTh4ETGCxTPsv0NRZqqh1 Xmgp7QxQ/p0jUZHRmsdDX/tvNFUs7hlBYkkoOyq0XHsWQ5fcDtNylBzYjTMciYFQIv4g3A1QlyIBs fqZ5SzFbntVQv1mGP1/7VK0YaOFipEKITPoh1kQLof5cnhzE0bLN5QZQnqCep97OVHRjsDstjiuGJ O/E52kog==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vryFe-00000006ZiD-3ijE; Mon, 16 Feb 2026 13:02:58 +0000 Received: from sender4-pp-f112.zoho.com ([136.143.188.112]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vryFW-00000006ZYv-0pNS; Mon, 16 Feb 2026 13:02:51 +0000 ARC-Seal: i=1; a=rsa-sha256; t=1771246943; cv=none; d=zohomail.com; s=zohoarc; b=k7clRDs/eIBZgJQ5S9mtFM4BZsPkTzoJFLOjFZ4oY3BqCWhkexsq/7RSSVYh46SlteUahlk/4PJzhQZbO5y7Dmw9dvnDdRSG1VCrmCPHkzSU+BBFCBvWXHuw1+DCBVkvNnetGs7/eWDLzZIpq58DUM/7cLmNKwcID9c3Y/DEzss= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1771246943; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=goTuCsz9zd4JcRIwXM2LrskUyMJNYiEchG/iLKNBRSQ=; b=ZbrhbQksx9u0V0YJd+JJEsIqjcOwNUzJ7ipX2yfMSN7uwy3ZebwcxY2tndl4vRAIVe5khZDwAU411MFJO7tHt1AwfBVCwGtl9TWKbEpKzwmi4hilKY2SS4UJJSff3R6tVC8Eos7aFNQJ2SRQNZRV2DXJlLg+6fRMqsTxgXAA5kc= 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=1771246943; 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:References:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=goTuCsz9zd4JcRIwXM2LrskUyMJNYiEchG/iLKNBRSQ=; b=KVQnQ9qNTOtx9p/S5IgkAfkne6Xl1mo+vlHGEg20dNIH4MCwjq26qh40VHZ3YAUN 3tvJPnMPrGsb8i+CGgkABl8cqxnS66MCJrsvO+x4E29P0ubz38FsqqpkYcciqHDtB/N N8q9yjT0qyxFIYlcNWBM12hulxt6MParydheM6lw= Received: by mx.zohomail.com with SMTPS id 177124694222336.605069080808676; Mon, 16 Feb 2026 05:02:22 -0800 (PST) From: Nicolas Frattaroli Date: Mon, 16 Feb 2026 14:01:20 +0100 Subject: [PATCH v8 06/20] drm/display: hdmi-state-helper: Try subsampling in mode_valid MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260216-color-format-v8-6-5722ce175dd5@collabora.com> References: <20260216-color-format-v8-0-5722ce175dd5@collabora.com> In-Reply-To: <20260216-color-format-v8-0-5722ce175dd5@collabora.com> To: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Dmitry Baryshkov , Sascha Hauer , Rob Herring , Jonathan Corbet Cc: kernel@collabora.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-doc@vger.kernel.org, Nicolas Frattaroli X-Mailer: b4 0.14.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260216_050250_297822_2BB10123 X-CRM114-Status: GOOD ( 13.32 ) 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 drm_hdmi_connector_mode_valid assumes modes are only valid if they work with RGB. The reality is more complex however: YCbCr 4:2:0 chroma-subsampled modes only require half the pixel clock that the same mode would require in RGB. This leads to drm_hdmi_connector_mode_valid rejecting perfectly valid 420-only or 420-also modes. Fix this by checking whether the mode is 420-capable first. If so, then proceed by checking it with HDMI_COLORSPACE_YUV420 so long as the connector has legalized 420, otherwise error out. If the mode is not 420-capable, check with RGB as was previously always the case. Fixes: 47368ab437fd ("drm/display: hdmi: add generic mode_valid helper") Signed-off-by: Nicolas Frattaroli --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c index 3ba752200984..0975fcba83f3 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -912,8 +912,21 @@ drm_hdmi_connector_mode_valid(struct drm_connector *connector, const struct drm_display_mode *mode) { unsigned long long clock; + enum hdmi_colorspace fmt; + + if (drm_mode_is_420_only(&connector->display_info, mode)) { + if (connector->ycbcr_420_allowed) + fmt = HDMI_COLORSPACE_YUV420; + else + return MODE_NO_420; + } else if (drm_mode_is_420_also(&connector->display_info, mode) && + connector->ycbcr_420_allowed) { + fmt = HDMI_COLORSPACE_YUV420; + } else { + fmt = HDMI_COLORSPACE_RGB; + } - clock = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB); + clock = drm_hdmi_compute_mode_clock(mode, 8, fmt); if (!clock) return MODE_ERROR; -- 2.53.0