From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f51.google.com (mail-wm1-f51.google.com [209.85.128.51]) (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 E867338D6BD for ; Wed, 19 Aug 2026 14:01:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787148081; cv=none; b=aH9ltchSFhgxzrzDEN0csRLaHOwINT/Gbat4AJ9/Uw2WqSJ83XUuIOGa4dst2H0YeCeH3Q9dbjINXDVSKY1bGJKTvV/uQjeR4tEZb1bEssGJMOzzK91Dsp/99iL4I0B/sO1oJXN37rptviWE5d/T3srug8np3t8E0fSxRlRsLM0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787148081; c=relaxed/simple; bh=jGEqquZ2fD8KfC6B3eKEDe79Xup6NmyDIFmkXgCEm9k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IJjxhllqbIFHYeVeq+HXZDu/YOtlSLpD/1By40J2ziKVijG7HbPM5mHL9kwxLDzEprnyiFn/KCbsLbeWnw1XZeXvnadCn3pPJRb6rhnojpG6thZUY+jrPL+O3OXj/SlDkiiI2AYsRFC+D5M9RV8SKz1RSqzXCe8rtATI5rD0uaU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=gAWXJJRT; arc=none smtp.client-ip=209.85.128.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gAWXJJRT" Received: by mail-wm1-f51.google.com with SMTP id 5b1f17b1804b1-4954d29264cso5618605e9.2 for ; Wed, 19 Aug 2026 07:01:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1787148078; x=1787752878; 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:content-type; bh=Njwz4GpR6Lsmc9++a5m2bWV+NAXHXBWZE5m0XlH/aas=; b=gAWXJJRTR2+10sOkexBeSWd5j9MwLQmFi75lqYj4IZU25t+RSQUXFgx4kgo8tSHhO6 S8PE6io5ZjSb6ZIAw2kj4A9Krnv81f4mDc2K29zDAcHvF186n5+3DGs9e9xHGMX44bQm r9BhedyICLMeX6LemI7/oProm6RgJxJvSlp8USwCnrJhZWPX7/tqnlh5U/hn62LdLuO0 KXLuwQkZIR72izGiRpZmFGxvsErVwl32la0zq1TMylLCDuOAapBzmpp9gMr2tpluw1U5 U3Ewq5pC3rwIrFiyNtByJzH/gWAh6tCQXWR9rq+g6sBcjSTGWWYArckcANyEVb1KjVIh DPPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787148078; x=1787752878; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=Njwz4GpR6Lsmc9++a5m2bWV+NAXHXBWZE5m0XlH/aas=; b=KaWuI/Jac92WUN71SNe8X8k1a/T7Kl9RmBaxIUCZmKlXAM2HrUGxB0Z+M9XsyLPmGK tDvDOHy3zdhO6EOCZxI9s3ui3zPoM6o43GCpxOqLgNT7+KO/tEOm8VHKtc3Uxvl4uoaw U9SJTVi16quDr7l+XDWWEiY5L0QxBQQvIZQUZoFuvvC6XA4QrquMPYbWhTgrZARpWq81 wwQyzPP7pjpI8eH33RRFnwDVjiAJiPQt03jkJz2OZ92wjw7EgYrVy4BUlRhgz/l7Of4K X3OJN68ZrRRxMJTjzQXu0CxNTkKVhVlmIEO8lHoxxuBP6UZqpyOlcMKDOMZYZ3cyEVrW 9+eg== X-Forwarded-Encrypted: i=1; AHgh+RoUqQ8XmPCkrVZ+cUpSzLZR2Er/PYOumF2EdLwx7HM5a8OFrqm2H9qtxvKPHfFPQ7CzhWtCGsBsdnQpZUdVSUbdgL2Z@vger.kernel.org X-Gm-Message-State: AOJu0YwijJWDJrwZEQnCp2tke4ONVhLDwWWULmtrgMoh/lXxxyCaZlkz 73gYhKasY5BZZB74oEQpx0FcstS+KJr0JLVjwqorBcb3JhUwvbni9ymQ X-Gm-Gg: AR+sD12KpH0AiBm9N/mrH80w9v9XOk2eGil+VgQrCuHH8t1rrXDMCE65YjiAFvrnVbf E79euaPXLCBXEJPRj+Yy+BNpv6AIzDmoeRL8LkLW5JZX9Xz5kFyiX+6FntFFJq0h2bY4JQjfWZN SxtazAgqiz1u4jUtnVEdQZbIAxvPCOwPhwO2aqgnVhQp480bp9ng6ejvMmPrjAyRN302PcRSRRB 74UXnhR7J4BzGg2xv4CofGnPBQeBN9mmVKN37Ualb1AdWFyMV9FIWronuwT82+/e0GZbk0MTWyG SFXD8DR41iV/lK/x2B8TOzhwhTD/4GIq5cc45SCEn2FNSPe+rybOpR+iBe4zL05Y+QkZsx9fnv4 HxYfoQX1pNftRj6CUxqIN4+S4mzMV2dl9tUpTU+n5H7N3gQSvysRUIQSI9HcxCMX7sUofr56I// 0zYaIIggIJtLwlKg/cggwWQMikewujbyHuEXevZYpseEVViYyrXJEac7Y= X-Received: by 2002:a05:600c:4e55:b0:499:a07d:a482 with SMTP id 5b1f17b1804b1-499aa1a28efmr108125755e9.10.1787148077976; Wed, 19 Aug 2026 07:01:17 -0700 (PDT) Received: from TC-LAPTOP ([2a01:e0a:b8a:2610:d3:816e:dd0c:fe6a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-499aa0fd728sm92751985e9.3.2026.08.19.07.01.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Aug 2026 07:01:17 -0700 (PDT) From: Thierry Chatard To: linux-kernel@vger.kernel.org Cc: hansg@kernel.org, lee@kernel.org, platform-driver-x86@vger.kernel.org, ilpo.jarvinen@linux.intel.com, djrscally@gmail.com, linux-media@vger.kernel.org, mchehab@kernel.org, sakari.ailus@linux.intel.com, jacopo.mondi@ideasonboard.com, nicholas@rothemail.net, andriy.shevchenko@intel.com, v.vitovt@gmail.com, Thierry Chatard Subject: [PATCH v7 1/5] platform/x86: intel_lpss: add resource conflict quirk for Dell Latitude 5285 Date: Wed, 19 Aug 2026 16:01:03 +0200 Message-ID: <20260819140107.1329091-2-tchatard@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260819140107.1329091-1-tchatard@gmail.com> References: <20260819140107.1329091-1-tchatard@gmail.com> Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Dell Latitude 5285 2-in-1 has a BIOS bug where the ACPI GEXP device and the I2C4 controller (INT3446) both claim the same MMIO region via the shared SB04 variable. This causes intel_lpss_acpi to fail binding to I2C4 with -EBUSY, preventing the front camera (OV5670) sensor from being registered. Add a DMI quirk that selects IGNORE_RESOURCE_CONFLICTS for INT3446 on this machine, matching the existing pattern used by other LPSS quirks. Signed-off-by: Thierry Chatard --- drivers/mfd/intel-lpss-acpi.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c index 63406026d..f08b41970 100644 --- a/drivers/mfd/intel-lpss-acpi.c +++ b/drivers/mfd/intel-lpss-acpi.c @@ -13,6 +13,8 @@ #include #include #include +#include +#include #include #include #include @@ -52,6 +54,16 @@ static const struct intel_lpss_platform_info spt_i2c_info = { .swnode = &spt_i2c_node, }; +/* + * Same as spt_i2c_info but with QUIRK_IGNORE_RESOURCE_CONFLICTS for Dell 5285 + * where ACPI GEXP device conflicts with I2C4 (INT3446) MMIO resources. + */ +static const struct intel_lpss_platform_info spt_i2c_info_ignore_conflicts = { + .clk_rate = 120000000, + .swnode = &spt_i2c_node, + .quirks = QUIRK_IGNORE_RESOURCE_CONFLICTS, +}; + static const struct property_entry uart_properties[] = { PROPERTY_ENTRY_U32("reg-io-width", 4), PROPERTY_ENTRY_U32("reg-shift", 2), @@ -172,6 +184,16 @@ static const struct acpi_device_id intel_lpss_acpi_ids[] = { }; MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids); +static const struct dmi_system_id dell5285_lpss_dmi[] = { + { + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5285"), + }, + }, + { } +}; + static int intel_lpss_acpi_probe(struct platform_device *pdev) { const struct intel_lpss_platform_info *data; @@ -182,6 +204,18 @@ static int intel_lpss_acpi_probe(struct platform_device *pdev) if (!data) return -ENODEV; + /* + * Apply IGNORE_RESOURCE_CONFLICTS for I2C4 on Dell Latitude 5285. + * The ACPI GEXP device conflicts with I2C4 (INT3446) MMIO resources + * due to a BIOS bug where both use the same SB04 variable. + */ + if (acpi_dev_hid_uid_match(ACPI_COMPANION(&pdev->dev), + "INT3446", NULL) && + dmi_check_system(dell5285_lpss_dmi)) { + dev_info(&pdev->dev, "Dell 5285: applying IGNORE_RESOURCE_CONFLICTS for I2C4\n"); + data = &spt_i2c_info_ignore_conflicts; + } + info = devm_kmemdup(&pdev->dev, data, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; -- 2.51.0