nvidia-oot: Add options to disable drivers

In Linux v6.2, the Tegra IVC driver was updated to support iosys-map and
this breaks building some of the out-of-tree drivers for Linux v6.2+
kernels. In Linux v6.3, the GPIO OF APIs were removed and this breaks
building some of the out-of-tree drivers that use these legacy APIs. For
now the broken drivers are not built for these corresponding kernels.

Instead of checking the kernel version in the Makefile for the
corresponding broken driver, move the kernel version checking to the
top-level Makefile and add CONFIG definitions that can be used the
various Makefiles.

This is also needed for working with 3rd party Linux kernels that may
have upstream backports and need to set these CONFIG variables for their
Linux kernel.

Bug 4221847

Change-Id: I35ee59bccdcdb1be56e4680c453279b421692c6a
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2996215
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

Makefile

@@ -6,6 +6,22 @@ LINUXINCLUDE += -I$(srctree.nvidia-oot)/include
 
 subdir-ccflags-y += -Werror
 
+LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
+LINUX_VERSION_6_2 := $(shell expr 6 \* 256 + 2)
+LINUX_VERSION_6_3 := $(shell expr 6 \* 256 + 3)
+
+# The Tegra IVC driver was updated to support iosys-map in Linux v6.2.
+# For Linux v6.2 kernels, don't build any drivers that requires this.
+ifeq ($(shell test $(LINUX_VERSION) -ge $(LINUX_VERSION_6_2); echo $$?),0)
+export CONFIG_TEGRA_IVC_LEGACY_DISABLE=y
+subdir-ccflags-y += -DCONFIG_TEGRA_IVC_LEGACY_DISABLE
+endif
+
+# Legacy GPIO support is removed in Linux v6.3
+ifeq ($(shell test $(LINUX_VERSION) -ge $(LINUX_VERSION_6_3); echo $$?),0)
+export CONFIG_TEGRA_GPIO_LEGACY_DISABLE=y
+endif
+
 ifeq ($(CONFIG_TEGRA_VIRTUALIZATION),y)
 subdir-ccflags-y += -DCONFIG_TEGRA_VIRTUALIZATION
 endif

drivers/firmware/tegra/Makefile

@@ -5,11 +5,8 @@
 # Makefile for Extended IVC Driver and BPMP driver
 #
 
-LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
-LINUX_VERSION_6_2 := $(shell expr 6 \* 256 + 2)
-
 obj-m		+= ivc_ext.o
-ifeq ($(shell test $(LINUX_VERSION) -lt $(LINUX_VERSION_6_2); echo $$?),0)
+ifneq ($(CONFIG_TEGRA_IVC_LEGACY_DISABLE),y)
 tegra_bpmp-y	+= ../../clk/tegra/clk-bpmp.o
 tegra_bpmp-y	+= ../../reset/tegra/reset-bpmp.o
 tegra_bpmp-y	+= ../../soc/tegra/powergate-bpmp.o
@@ -17,4 +14,3 @@ tegra_bpmp-$(CONFIG_DEBUG_FS)	+= bpmp-debugfs.o
 tegra_bpmp-y	+= bpmp-tegra186-hv.o
 obj-m 		+= tegra_bpmp.o
 endif
-

drivers/media/platform/tegra/cdi/Makefile

@@ -1,11 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 # Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
-LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
+ifneq ($(CONFIG_TEGRA_GPIO_LEGACY_DISABLE),y)
-LINUX_VERSION_6_3 := $(shell expr 6 \* 256 + 3)
-
-# cdi_gpio/mgr is currently broken for Linux v6.3 and so skip for Linux v6.3+
-ifeq ($(shell test $(LINUX_VERSION) -lt $(LINUX_VERSION_6_3); echo $$?),0)
 obj-m	+= cdi_gpio.o
 obj-m	+= cdi_mgr.o
 endif

drivers/media/platform/tegra/isc/Makefile

@@ -6,8 +6,7 @@ GCOV_PROFILE := y
 LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
 LINUX_VERSION_6_3 := $(shell expr 6 \* 256 + 3)
 
-# isc_gpio/mgr is currently broken for Linux v6.3 and so skip for Linux v6.3+
+ifneq ($(CONFIG_TEGRA_GPIO_LEGACY_DISABLE),y)
-ifeq ($(shell test $(LINUX_VERSION) -lt $(LINUX_VERSION_6_3); echo $$?),0)
 obj-m	+= isc_gpio.o
 obj-m	+= isc_mgr.o
 endif

drivers/misc/Makefile

@@ -1,18 +1,16 @@
 # SPDX-License-Identifier: GPL-2.0
 # Copyright (c) 2022-2023, NVIDIA CORPORATION.  All rights reserved.
 
-LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
-LINUX_VERSION_6_3 := $(shell expr 6 \* 256 + 3)
-
 ifeq ($(findstring ack_src,$(NV_BUILD_KERNEL_OPTIONS)),)
+ifneq ($(CONFIG_TEGRA_IVC_LEGACY_DISABLE),y)
 obj-m += mods/
 endif
+endif
 obj-m += nvsciipc/
 ifdef CONFIG_PCI
 obj-m += tegra-pcie-dma-test.o
 endif
-# bluedroid_pm is currently broken for Linux v6.3 and so skip for Linux v6.3+
+ifneq ($(CONFIG_TEGRA_GPIO_LEGACY_DISABLE),y)
-ifeq ($(shell test $(LINUX_VERSION) -lt $(LINUX_VERSION_6_3); echo $$?),0)
 obj-m += bluedroid_pm.o
 endif
 obj-m += nvscic2c-pcie/

drivers/platform/tegra/rtcpu/Makefile

@@ -1,13 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0-only
 # Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
-LINUX_VERSION := $(shell expr $(VERSION) \* 256 + $(PATCHLEVEL))
-LINUX_VERSION_6_2 := $(shell expr 6 \* 256 + 2)
-
 ccflags-y += -Wframe-larger-than=2048
 
-# capture-ivc is currently broken for Linux v6.2 and so skip for Linux v6.2+
+ifneq ($(CONFIG_TEGRA_IVC_LEGACY_DISABLE),y)
-ifeq ($(shell test $(LINUX_VERSION) -lt $(LINUX_VERSION_6_2); echo $$?),0)
 obj-m += capture-ivc.o
 endif
 obj-m += ivc-bus.o

include/linux/tegra-capture-ivc.h

@@ -9,7 +9,7 @@
 #include <linux/types.h>
 #include <linux/version.h>
 
-#if (KERNEL_VERSION(6, 2, 0) > LINUX_VERSION_CODE)
+#if !defined(CONFIG_TEGRA_IVC_LEGACY_DISABLE)
 /**
  * @brief Submit the control message binary blob to capture-IVC driver,
  *	which is to be transferred over control IVC channel to RTCPU.
@@ -187,6 +187,6 @@ static inline int tegra_capture_ivc_unregister_capture_cb(
 {
 	return -ENOTSUPP;
 };
-#endif /* (KERNEL_VERSION(6, 2, 0) > LINUX_VERSION_CODE) */
+#endif /* !defined(CONFIG_TEGRA_IVC_LEGACY_DISABLE) */
 
 #endif /* INCLUDE_CAPTURE_IVC_H */