From nobody Mon Feb 9 14:14:57 2026 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9182F2103 for ; Wed, 28 Feb 2024 01:11:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709082701; cv=none; b=aMyJNXUasNdFJPhLTvZCzXTvlHLzhIY24zWArBFHSBTQqKmGo/lvO9aupMHPBrZTZ35qDq6R5+5tt5TDAMNwsUpQfurKJOpI+tHHSkeEpMfzfUh88fKgLtGHfc6UErpEvkobFYmDEfAiFWZR6sH9itj3yHMHFYdSL25eJFewg6A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709082701; c=relaxed/simple; bh=+Za4WiG0WeyFO8aiqq35F/0dX8b+SoiVTKiGqv26ccQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F0F/M8pwJJIeRHs3rFseWM2qA34I4WjO/nsVdoO0J+tWb9h8EtDHWJ+0m9mfkB6AgKyY8s4l+uM6WbP0XWl1pJbfpddZXFyneh4J3M1HR+oHZWwFAwvC0KobLTyvYXlz3arohwHBSF9JZ+kv3wjTWcjXF5E2R2LGLj3XgU7uY2s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=YXCjJu/p; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="YXCjJu/p" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-1dc49b00bdbso43938445ad.3 for ; Tue, 27 Feb 2024 17:11:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1709082699; x=1709687499; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=iXmDMoR5fxDfWHfx9hk2z/Xni/CCYvEBdkiUT3ERlc4=; b=YXCjJu/pDXM02doM7Ol9O5QLVQIXeH+9fvOKY08FxUrKvW9WmKJ9x9Ohafd1o6lRmE YqM7HXaJzBzfBVqMOTqSQHNVCZRLx8WvpksriTLhVY26lm07BtF7ThiKqHUAFmgywSZW V2UzkH6yaUemZ4/1bQNdc8ttWCF/L/ZiLR8bg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709082699; x=1709687499; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=iXmDMoR5fxDfWHfx9hk2z/Xni/CCYvEBdkiUT3ERlc4=; b=kh1raWzf3h8gCsQ3xpHpyEwEqmeR415hFwncU3of2fSp0uraq30/31K2WpklMJZES4 llm409iPMazl2dm3Pi06kYymzuLCjch0wN3vVQYpoiOJHccSHcLRM95gGia7k1HqKT2l FDa3PfA+Nj4goYD70V5YI9FiYEdWTqhxMUOHq9eUgnwFof8Nib/gJiju1cZE2AeYnlan DF9KXQZ9PKyCao7KVASyja5EwR5wcZwd52HE36ei6BhPDB82Y+gJbYXVTOvasNylSpX3 gY/64o2t2f3A90eCtLarfxiT2Nntm702bOAyqQDXe0OBBnJ7HtYq53GtRUHtzxFvNlih 733w== X-Forwarded-Encrypted: i=1; AJvYcCWuLvrw57VLZKjnz7jIp+SVq0x9iKZAN1P6ziR2OlYpeNqe+fH7TbgY8qSdj8sQpzeAkJWKyTqLLugEN9+HOnALV1RUahar8O7zsQox X-Gm-Message-State: AOJu0Yxss8KsQsBiqUxVhuXHhNd02ZpNggRS9QRosJObpRaoGthhkz5l 7Fq+y5McgLkHSWN9CTS5FP5HDBvGcNe479kC2rc+IUY2HYk0Ut8outQogqs+6Q== X-Google-Smtp-Source: AGHT+IFZU274TcXtjwUJ4KumuJnFvswQ8pqcET9/pvdjkcdY+FVA+6GXBMXUpT3bKpLlEHZ2fby6QQ== X-Received: by 2002:a17:902:8303:b0:1dc:5e8a:93b with SMTP id bd3-20020a170902830300b001dc5e8a093bmr9108581plb.8.1709082698923; Tue, 27 Feb 2024 17:11:38 -0800 (PST) Received: from hsinyi.sjc.corp.google.com ([2620:15c:9d:2:87d1:e95d:b670:4783]) by smtp.gmail.com with ESMTPSA id kl14-20020a170903074e00b001db4b3769f6sm2131529plb.280.2024.02.27.17.11.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Feb 2024 17:11:38 -0800 (PST) From: Hsin-Yi Wang To: Douglas Anderson Cc: Neil Armstrong , Jessica Zhang , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] drm_edid: Support getting EDID through ddc without connector Date: Tue, 27 Feb 2024 17:05:58 -0800 Message-ID: <20240228011133.1238439-2-hsinyi@chromium.org> X-Mailer: git-send-email 2.44.0.rc1.240.g4c46232300-goog In-Reply-To: <20240228011133.1238439-1-hsinyi@chromium.org> References: <20240228011133.1238439-1-hsinyi@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Some panels are interested in the EDID during early probe when connector is still unknown. Add a function drm_get_edid_no_connector() to get edid without connector. No functional change for existing usage. Signed-off-by: Hsin-Yi Wang --- v1->v2: add a function to return the entire edid without updating connector. --- drivers/gpu/drm/drm_edid.c | 45 ++++++++++++++++++++++++++++---------- include/drm/drm_edid.h | 1 + 2 files changed, 34 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 1ad94473e400..15b97c8ed993 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2364,7 +2364,7 @@ static struct edid *_drm_do_get_edid(struct drm_conne= ctor *connector, struct edid *edid, *new; size_t alloc_size =3D EDID_LENGTH; =20 - override =3D drm_edid_override_get(connector); + override =3D connector ? drm_edid_override_get(connector) : false; if (override) { alloc_size =3D override->size; edid =3D kmemdup(override->edid, alloc_size, GFP_KERNEL); @@ -2385,18 +2385,20 @@ static struct edid *_drm_do_get_edid(struct drm_con= nector *connector, if (status =3D=3D EDID_BLOCK_READ_FAIL) goto fail; =20 - /* FIXME: Clarify what a corrupt EDID actually means. */ - if (status =3D=3D EDID_BLOCK_OK || status =3D=3D EDID_BLOCK_VERSION) - connector->edid_corrupt =3D false; - else - connector->edid_corrupt =3D true; + if (connector) { + /* FIXME: Clarify what a corrupt EDID actually means. */ + if (status =3D=3D EDID_BLOCK_OK || status =3D=3D EDID_BLOCK_VERSION) + connector->edid_corrupt =3D false; + else + connector->edid_corrupt =3D true; =20 - if (!edid_block_status_valid(status, edid_block_tag(edid))) { - if (status =3D=3D EDID_BLOCK_ZERO) - connector->null_edid_counter++; + if (!edid_block_status_valid(status, edid_block_tag(edid))) { + if (status =3D=3D EDID_BLOCK_ZERO) + connector->null_edid_counter++; =20 - connector_bad_edid(connector, edid, 1); - goto fail; + connector_bad_edid(connector, edid, 1); + goto fail; + } } =20 if (!edid_extension_block_count(edid)) @@ -2444,7 +2446,8 @@ static struct edid *_drm_do_get_edid(struct drm_conne= ctor *connector, } =20 if (invalid_blocks) { - connector_bad_edid(connector, edid, num_blocks); + if (connector) + connector_bad_edid(connector, edid, num_blocks); =20 edid =3D edid_filter_invalid_blocks(edid, &alloc_size); } @@ -2637,6 +2640,24 @@ struct edid *drm_get_edid(struct drm_connector *conn= ector, } EXPORT_SYMBOL(drm_get_edid); =20 +/** + * drm_get_edid_no_connector - get EDID data without updating connector st= atus + * @adapter: I2C adapter to use for DDC + * + * Similar to drm_edid_read_ddc(), but not checking any connector status. = Use + * this function to get EDID when connector is still unknown. + * + * Return: Pointer to valid EDID or NULL if we couldn't find any. + */ +struct edid *drm_get_edid_no_connector(struct i2c_adapter *adapter) +{ + if (!drm_probe_ddc(adapter)) + return NULL; + + return _drm_do_get_edid(NULL, drm_do_probe_ddc_edid, adapter, NULL); +} +EXPORT_SYMBOL(drm_get_edid_no_connector); + /** * drm_edid_read_custom - Read EDID data using given EDID block read funct= ion * @connector: Connector to use diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 70ae6c290bdc..80c9e32ff80e 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -565,6 +565,7 @@ struct edid *drm_do_get_edid(struct drm_connector *conn= ector, void *data); struct edid *drm_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter); +struct edid *drm_get_edid_no_connector(struct i2c_adapter *adapter); u32 drm_edid_get_panel_id(struct i2c_adapter *adapter); struct edid *drm_get_edid_switcheroo(struct drm_connector *connector, struct i2c_adapter *adapter); --=20 2.44.0.rc1.240.g4c46232300-goog