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[84.124.213.91]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49ce4761dd1sm341499735e9.0.2026.09.08.09.16.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Sep 2026 09:16:21 -0700 (PDT) From: "D. Manresa" To: Lee Jones Cc: Thierry Chatard , Andy Shevchenko , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sakari Ailus , Daniel Scally , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH] mfd: intel-lpss: add Dell Latitude 7275 to the resource conflict quirk Date: Tue, 8 Sep 2026 18:16:29 +0200 Message-ID: <20260908161629.335223-1-dmanresa@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260831160754.9857-2-tchatard@gmail.com> References: <20260831160754.9857-2-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 7275 2-in-1 has the same BIOS bug as the Latitude 5285: the ACPI GEXP device declares an OperationRegion (BAR0) on the GNVS variable SB04 and the I2C4 controller (INT3446) builds its _CRS from that same variable, so intel_lpss_acpi fails to bind the controller with -EBUSY and the front camera sensor (OV5670, INT3479) is never registered unless acpi_enforce_resources=lax is passed. Add the machine to the DMI table so QUIRK_IGNORE_RESOURCE_CONFLICTS is applied to INT3446 on it as well. Assisted-by: Claude Code:claude-fable-5-1 Signed-off-by: D. Manresa --- Applies on top of "mfd: intel-lpss: add resource conflict quirk for Dell Latitude 5285" from Thierry Chatard's v10 series [1]. Thierry, feel free to fold this into v11 instead if you prefer. The conflict was verified in the 7275 DSDT (BIOS 1.18.0): GEXP has OperationRegion (BAR0, SystemMemory, SB04, 0x0208) and INT3446._CRS returns LCRS (SMD4, SB04, SIR4). With acpi_enforce_resources=lax, which has the same effect as the quirk, the controller binds and the camera works with the board data from "platform/x86: int3472: Add TPS68470 board data for Dell Latitude 7275" [2]. The distribution kernel here builds intel-lpss-acpi in, so this exact patch has not been run yet. [1] https://lore.kernel.org/linux-media/20260831160754.9857-2-tchatard@gmail.com/ [2] https://lore.kernel.org/platform-driver-x86/20260908161445.334910-1-dmanresa@gmail.com/ drivers/mfd/intel-lpss-acpi.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/mfd/intel-lpss-acpi.c +++ b/drivers/mfd/intel-lpss-acpi.c @@ -191,6 +191,12 @@ static const struct dmi_system_id intel_lpss_quirk_dmi[] = { DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5285"), }, }, + { + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 7275"), + }, + }, { } };