From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.tuxedocomputers.com (mail.tuxedocomputers.com [157.90.84.7]) (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 DF10D18EFD1 for ; Fri, 14 Nov 2025 18:43:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=157.90.84.7 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763145833; cv=none; b=Y3UrRlBaj8JqZ849u1MgRj7D6V6SwkgKWLKhSAbbKwS+VgdnfsSmRrYLRXUuSI8Ud+VXuu12mkruDov/CFRHOS43vGi0zsR6vCwn+PhFKft+KB6yXD9vUhBPOOkSND3GUgzfWqDJ17CsxTNCQjGPXfJnc2xKRGKP4j1hixP4VbM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763145833; c=relaxed/simple; bh=5S1Uetg4PQMaMnNKGMaNJbWOujc5087BIISmxjU+LV0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Ej9Ai1tftkfqeLgBi8bUi311zKN0DzvEd1h7ZGGiH7+NqZ0+VmE+wmgX2IPgIHEKca7ldOCW7UMfPNkjnCwaey6q4mwZjzPIt9wHQED0kKfO5/dKqtMuKBwmvscUZ9ae2kwS5r4csHE+3Gfek2vSMOLfQ9Qw85HWQQhCgWTKzVQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=tuxedocomputers.com; spf=pass smtp.mailfrom=tuxedocomputers.com; dkim=pass (1024-bit key) header.d=tuxedocomputers.com header.i=@tuxedocomputers.com header.b=arM0DeMj; arc=none smtp.client-ip=157.90.84.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=tuxedocomputers.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tuxedocomputers.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=tuxedocomputers.com header.i=@tuxedocomputers.com header.b="arM0DeMj" Received: from [192.168.42.116] (pd9e597c7.dip0.t-ipconnect.de [217.229.151.199]) (Authenticated sender: wse@tuxedocomputers.com) by mail.tuxedocomputers.com (Postfix) with ESMTPSA id 983CA2FC0055; Fri, 14 Nov 2025 19:43:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuxedocomputers.com; s=default; t=1763145822; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wIh2yxRQ6myZOupH3MgrEF6f57VtS9hajQqNYl8br/0=; b=arM0DeMjR4Pa23wxqYQ/czrRnMyTd8G97pRqUlcd1nYHX7DaGbj5OxGL6nmKNQj9+ZmPTj bFxTUip51zrk2hcLEoyd3ihwCHgeGobPvx2r3AdyaNs2v/LfMwC6Zsn0D2uHSReCTOtBwy kw+EJ96EhoJzWvnrtFzOHMqXnzBcQ68= Authentication-Results: mail.tuxedocomputers.com; auth=pass smtp.auth=wse@tuxedocomputers.com smtp.mailfrom=wse@tuxedocomputers.com Message-ID: <2531c69c-2b56-40db-8344-62a4613b2641@tuxedocomputers.com> Date: Fri, 14 Nov 2025 19:43:41 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] drm/i915/display: Add quirk to force backlight type on some TUXEDO devices To: jani.nikula@linux.intel.com, rodrigo.vivi@intel.com, joonas.lahtinen@linux.intel.com, tursulin@ursulin.net, airlied@gmail.com, simona@ffwll.ch Cc: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250411171756.142777-1-wse@tuxedocomputers.com> <20250411171756.142777-2-wse@tuxedocomputers.com> Content-Language: en-US From: Werner Sembach In-Reply-To: <20250411171756.142777-2-wse@tuxedocomputers.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Am 11.04.25 um 17:55 schrieb Werner Sembach: > > - switch (display->params.enable_dpcd_backlight) { > + enable_dpcd_backlight = display->params.enable_dpcd_backlight; > + if (enable_dpcd_backlight == INTEL_DP_AUX_BACKLIGHT_AUTO && > + intel_has_quirk(display, QUIRK_AUO_12701_21229_ENABLE_DPCD_BACKLIGHT)) { > + pnl_id = drm_edid_get_panel_id(panel->fixed_edid); > + if (pnl_id == drm_edid_encode_panel_id('A', 'U', 'O', 0x319d) || > + pnl_id == drm_edid_encode_panel_id('A', 'U', 'O', 0x52ed)) So I looked into this patch again to build a v2 and found "static const struct intel_dpcd_quirk intel_dpcd_quirks[]" in drivers/gpu/drm/i915/display/intel_quirks.c which sounds like it can select quirks based on panels, making this pnl_id check obsolete. But I now wasted half a day trying to find out how I can get the SINK_OUI and SINK_DEVICE_ID out of a device. Is there some way to read that from sysfs or debugfs? >