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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: linux-media@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