From nobody Thu Mar 19 03:44:49 2026 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C53330E0EF; Mon, 16 Feb 2026 13:02:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771246979; cv=pass; b=SBT2CaHvGYR4v5tOOMXO78F0nR5R45+zvLGP/prstyBYIaKOHTNpQaF8Vfvpk67DVxjdKWMDQXhRz6H/5dOkjHZnFr1Eo8n9+fKUpJe3mKnF4lDrgirRHEstfvP/b5Kz8U49zFwLZaaPkWRaLNMdSF3qqTcehh6kPsafk9oBycE= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771246979; c=relaxed/simple; bh=s/xNrrzmyfUxm/yLqr0JZ3JDVgvKplDoIPKNf4l1YTM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=b0C57igguYwwIA166RPctBN+Gs4L2PgRSAIsWmEkvfwZdkCW7K/mV4QG98iD43l47R2Lg8qCqdaxtwfH8OatmuI3bPkq8K+jJey9suiDOAVP8B5fEAkBHNzsRbQpzunZmrFot3nibCewPjPDcAbcEHL+g0heF5cFbrPk/LP9ekQ= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=nicolas.frattaroli@collabora.com header.b=KVQnQ9qN; arc=pass smtp.client-ip=136.143.188.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=nicolas.frattaroli@collabora.com header.b="KVQnQ9qN" 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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 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 Reviewed-by: Maxime Ripard --- 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 *co= nnector, 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 =3D HDMI_COLORSPACE_YUV420; + else + return MODE_NO_420; + } else if (drm_mode_is_420_also(&connector->display_info, mode) && + connector->ycbcr_420_allowed) { + fmt =3D HDMI_COLORSPACE_YUV420; + } else { + fmt =3D HDMI_COLORSPACE_RGB; + } =20 - clock =3D drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB); + clock =3D drm_hdmi_compute_mode_clock(mode, 8, fmt); if (!clock) return MODE_ERROR; =20 --=20 2.53.0