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Tue, 24 Mar 2026 14:42:08 -0700 (PDT) Received: from TC-LAPTOP.lan ([209.76.64.37]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c1536aa870sm3284180eec.2.2026.03.24.14.42.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 14:42:08 -0700 (PDT) From: Thierry Chatard To: linux-kernel@vger.kernel.org Cc: linux-media@vger.kernel.org, platform-driver-x86@vger.kernel.org, lee@kernel.org, djrscally@gmail.com, hansg@kernel.org, ilpo.jarvinen@linux.intel.com, mchehab@kernel.org, sakari.ailus@linux.intel.com, jacopo.mondi@ideasonboard.com, nicholas@rothemail.net, Thierry Chatard Subject: [PATCH v2 1/3] platform/x86: intel_lpss: add resource conflict quirk for Dell Latitude 5285 Date: Tue, 24 Mar 2026 14:41:25 -0700 Message-ID: <20260324214129.17300-2-tchatard@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260324214129.17300-1-tchatard@gmail.com> References: <20260320000937.9177-1-tchatard@gmail.com> <20260324214129.17300-1-tchatard@gmail.com> 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" 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 | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c index 63406026d..7d0964848 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 +54,15 @@ static const struct intel_lpss_platform_info spt_i2c_inf= o =3D { .swnode =3D &spt_i2c_node, }; =20 +/* 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= =3D { + .clk_rate =3D 120000000, + .swnode =3D &spt_i2c_node, + .quirks =3D QUIRK_IGNORE_RESOURCE_CONFLICTS, +}; + static const struct property_entry uart_properties[] =3D { PROPERTY_ENTRY_U32("reg-io-width", 4), PROPERTY_ENTRY_U32("reg-shift", 2), @@ -172,6 +183,16 @@ static const struct acpi_device_id intel_lpss_acpi_ids= [] =3D { }; MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids); =20 +static const struct dmi_system_id dell5285_lpss_dmi[] =3D { + { + .matches =3D { + 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 +203,17 @@ static int intel_lpss_acpi_probe(struct platform_devic= e *pdev) if (!data) return -ENODEV; =20 + /* 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 (data =3D=3D &spt_i2c_info && + 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 =3D &spt_i2c_info_ignore_conflicts; + } + info =3D devm_kmemdup(&pdev->dev, data, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; --=20 2.51.0