Re: [PATCH] mfd: intel-lpss: add Dell Latitude 7275 to the resource conflict quirk

[Andy Shevchenko]

On Tue, Sep 08, 2026 at 06:16:29PM +0200, D. Manresa wrote:
> 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 <dmanresa@xxxxxxxxx>
> ---
> 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.

Do not fold, just add into the series this one as patch 2, for example.

> 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.

The patches still need an Ack from Lee.

> [1] https://lore.kernel.org/linux-media/20260831160754.9857-2-tchatard@xxxxxxxxx/
> [2] https://lore.kernel.org/platform-driver-x86/20260908161445.334910-1-dmanresa@xxxxxxxxx/
-- 
With Best Regards,
Andy Shevchenko