This is a note to let you know that I've just added the patch titled
media: ipu3-cio2: allow ipu_bridge to be a module again
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-ipu3-cio2-allow-ipu_bridge-to-be-a-module-again.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2545a2c02ba1da9cfb9ec218623c71b00eb4a555 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@xxxxxxxxxx>
Date: Thu, 27 Jul 2023 14:22:58 +0200
Subject: media: ipu3-cio2: allow ipu_bridge to be a module again
From: Arnd Bergmann <arnd@xxxxxxxxxx>
commit 2545a2c02ba1da9cfb9ec218623c71b00eb4a555 upstream.
This code was previously part of the VIDEO_IPU3_CIO2 driver, which could
be built-in or a loadable module, but after the move it turned into a
builtin-only driver. This fails to link when the I2C subsystem is a
module:
x86_64-linux-ld: drivers/media/pci/intel/ipu-bridge.o: in function `ipu_bridge_unregister_sensors':
ipu-bridge.c:(.text+0x50): undefined reference to `i2c_unregister_device'
x86_64-linux-ld: drivers/media/pci/intel/ipu-bridge.o: in function `ipu_bridge_init':
ipu-bridge.c:(.text+0x9c9): undefined reference to `i2c_acpi_new_device_by_fwnode'
In general, drivers should not have to be built-in, so change the option
to a tristate with the corresponding dependency. This in turn opens a
new problem with the dependency, as the IPU bridge can be a loadable module
while the ipu3 driver itself is built-in, producing a new link failure:
86_64-linux-ld: drivers/media/pci/intel/ipu3/ipu3-cio2.o: in function `cio2_pci_probe':
ipu3-cio2.c:(.text+0x197e): undefined reference to `ipu_bridge_init'
In order to fix this, restore the old Kconfig option that controlled
the ipu bridge driver before it was split out, but make it select a
hidden symbol that now corresponds to the bridge driver.
When other drivers get added that share ipu-bridge, this should cover
all corner cases, and allow any combination of them to be built-in
or modular.
Link: https://lore.kernel.org/linux-media/20230727122331.2421453-1-arnd@xxxxxxxxxx
Fixes: 881ca25978c6 ("media: ipu3-cio2: rename cio2 bridge to ipu bridge and move out of ipu3")'
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/pci/intel/Kconfig | 21 +++++----------------
drivers/media/pci/intel/ipu-bridge.c | 3 +++
drivers/media/pci/intel/ipu3/Kconfig | 20 ++++++++++++++++++++
3 files changed, 28 insertions(+), 16 deletions(-)
--- a/drivers/media/pci/intel/Kconfig
+++ b/drivers/media/pci/intel/Kconfig
@@ -1,21 +1,10 @@
# SPDX-License-Identifier: GPL-2.0-only
config IPU_BRIDGE
- bool "Intel IPU Sensors Bridge"
- depends on VIDEO_IPU3_CIO2 && ACPI
- depends on I2C
+ tristate
+ depends on I2C && ACPI
help
- This extension provides an API for the Intel IPU driver to create
- connections to cameras that are hidden in the SSDB buffer in ACPI.
- It can be used to enable support for cameras in detachable / hybrid
- devices that ship with Windows.
-
- Say Y here if your device is a detachable / hybrid laptop that comes
- with Windows installed by the OEM, for example:
-
- - Microsoft Surface models (except Surface Pro 3)
- - The Lenovo Miix line (for example the 510, 520, 710 and 720)
- - Dell 7285
-
- If in doubt, say N here.
+ This is a helper module for the IPU bridge, which can be
+ used by ipu3 and other drivers. In order to handle module
+ dependencies, this is selected by each driver that needs it.
source "drivers/media/pci/intel/ipu3/Kconfig"
--- a/drivers/media/pci/intel/ipu-bridge.c
+++ b/drivers/media/pci/intel/ipu-bridge.c
@@ -497,3 +497,6 @@ err_free_bridge:
return ret;
}
EXPORT_SYMBOL_NS_GPL(ipu_bridge_init, INTEL_IPU_BRIDGE);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Intel IPU Sensors Bridge driver");
--- a/drivers/media/pci/intel/ipu3/Kconfig
+++ b/drivers/media/pci/intel/ipu3/Kconfig
@@ -8,6 +8,7 @@ config VIDEO_IPU3_CIO2
select VIDEO_V4L2_SUBDEV_API
select V4L2_FWNODE
select VIDEOBUF2_DMA_SG
+ select IPU_BRIDGE if CIO2_BRIDGE
help
This is the Intel IPU3 CIO2 CSI-2 receiver unit, found in Intel
@@ -17,3 +18,22 @@ config VIDEO_IPU3_CIO2
Say Y or M here if you have a Skylake/Kaby Lake SoC with MIPI CSI-2
connected camera.
The module will be called ipu3-cio2.
+
+config CIO2_BRIDGE
+ bool "IPU3 CIO2 Sensors Bridge"
+ depends on VIDEO_IPU3_CIO2 && ACPI
+ depends on I2C
+ help
+ This extension provides an API for the ipu3-cio2 driver to create
+ connections to cameras that are hidden in the SSDB buffer in ACPI.
+ It can be used to enable support for cameras in detachable / hybrid
+ devices that ship with Windows.
+
+ Say Y here if your device is a detachable / hybrid laptop that comes
+ with Windows installed by the OEM, for example:
+
+ - Microsoft Surface models (except Surface Pro 3)
+ - The Lenovo Miix line (for example the 510, 520, 710 and 720)
+ - Dell 7285
+
+ If in doubt, say N here.
Patches currently in stable-queue which might be from arnd@xxxxxxxxxx are
queue-6.4/arm-ptrace-restore-syscall-restart-tracing.patch
queue-6.4/media-ipu3-cio2-allow-ipu_bridge-to-be-a-module-again.patch
queue-6.4/kernfs-add-stub-helper-for-kernfs_generic_poll.patch
queue-6.4/arm-ptrace-restore-syscall-skipping-for-tracers.patch
queue-6.4/mac80211-make-ieee80211_tx_info-padding-explicit.patch
queue-6.4/wifi-ath12k-fix-memcpy-array-overflow-in-ath12k_peer.patch
