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Tue, 24 Mar 2026 14:42:03 -0700 (PDT) Received: from TC-LAPTOP.lan ([209.76.64.37]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c1536aa870sm3284180eec.2.2026.03.24.14.42.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 14:42:02 -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 0/5] Enable dual cameras on Dell Latitude 5285 2-in-1 Date: Tue, 24 Mar 2026 14:41:24 -0700 Message-ID: <20260324214129.17300-1-tchatard@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260320000937.9177-1-tchatard@gmail.com> References: <20260320000937.9177-1-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: 8bit Changes in v2: - patch 2: split trailing statements in aml_parse_int() onto separate lines (checkpatch); add kernel-doc @param descriptions to aml_parse_int(), dell5285_gnvs_from_table(), and dell5285_gnvs_find() (kernel test robot); add Reported-by/Closes tags - patch 3: wrap long lines in commit message (checkpatch) The Dell Latitude 5285 2-in-1 has two cameras (OV5670 front, OV8858 rear) connected through a TPS68470 PMIC/clock/GPIO hub. All five patches are required for a working system; each is self-contained and bisect-safe. Hardware topology ----------------- Front camera: OV5670 (ACPI INT3479), I2C4 / INT3446 Rear camera: OV8858 (ACPI INT3477), I2C2 / i2c_designware.3 PMIC: TPS68470 (ACPI INT3472:05), addr 0x4D, on I2C2 ISP: Intel IPU3 (ipu3_cio2 + ipu3-imgu) The OV8858 is daisy-chained behind the TPS68470 S_I2C passthrough port. The TPS68470 VSIO regulator controls S_I2C_CTL (reg 0x43); marking it always_on keeps the passthrough active from boot so OV8858 is reachable on I2C2 at probe time. Four problems must be fixed in combination: patch 1/5 - intel_lpss: The BIOS claims the same MMIO region for both GEXP and INT3446 (I2C4). Without this quirk the kernel rejects INT3446 as a resource conflict and the front camera's I2C bus never comes up. patch 2/5 - GNVS fixup: With I2C4 available, ipu_bridge still does not create the front camera client because _DEP on INT3479 returns the root PCI bus instead of the INT3472 handle. Root cause: BIOS leaves GNVS fields C0TP, L0CL, L1CL at zero. Fix: scan DSDT/SSDTs for the GNVS OperationRegion at TPS68470 probe time and write 0x02 (19.2 MHz) into all three fields before ipu_bridge evaluates _DEP. patch 3/5 - TPS68470 board data: No board data existed for this machine, so no PMIC regulators or GPIOs were configured for either sensor. patch 4/5 - ipu-bridge: INT3477 (OV8858) was unknown to ipu_bridge, so it was skipped at CSI-2 enumeration. patch 5/5 - ov8858 driver: No ACPI match for INT3477, and the driver did not request the vsio supply needed by the S_I2C passthrough. Tested on Dell Latitude 5285 2-in-1, Ubuntu 25.10, kernel 6.17.0-19. Both cameras appear in libcamera and are usable in applications. Note: the IPU3 IMGU can only run one pipeline at a time, so front and rear camera use is mutually exclusive. Thierry Chatard (5): platform/x86: intel_lpss: add resource conflict quirk for Dell Latitude 5285 platform/x86: int3472: tps68470: fix GNVS clock fields for Dell Latitude 5285 platform/x86: int3472: tps68470: add board data for Dell Latitude 5285 media: ipu-bridge: add sensor configuration for OV8858 (INT3477) media: ov8858: add ACPI device ID INT3477 and vsio power supply drivers/mfd/intel-lpss-acpi.c | 32 +++ drivers/media/i2c/ov8858.c | 10 +- drivers/media/pci/intel/ipu-bridge.c | 2 ++ drivers/platform/x86/intel/int3472/tps68470.c | 201 ++++++++++++++++++ .../x86/intel/int3472/tps68470_board_data.c | 163 ++++++++++++++ 5 files changed, 407 insertions(+), 1 deletion(-) base-commit: 6de23f81a4be5ee86a4df4fde0ca0c7bf67aecd1 -- 2.51.0