[PATCH v2] gpu: nova: require little endian

[Eliot Courtney <ecourtney@nvidia.com>]

The driver already assumes little endian in a lot of locations. For
example, all the code that reads RPCs out of the command queue just
directly interprets the bytes.

Make this explicit in Kconfig.

Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
---
The current code assumes little endian in a bunch of places. I think we
should either explicitly decide to be generic on endianness or explicitly
decide not to - having some handling sprinkled around in various
locations seems confusing to me.

I believe that currently e.g. `RUST` transitively depends on
!CPU_BIG_ENDIAN, so this is more about making the decision explicit for
nova-core rather than fixing any kind of hole.
---
Changes in v2:
- Also add to nova-drm (Thanks Danilo)
- Did not take Reviewed-by + Acked-by because commit changed
  substantively
- Link to v1: https://patch.msgid.link/20260406-fix-kconfig-v1-1-8f634499f7f0@nvidia.com
---
 drivers/gpu/drm/nova/Kconfig  | 1 +
 drivers/gpu/nova-core/Kconfig | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/nova/Kconfig b/drivers/gpu/drm/nova/Kconfig
index 3e637ad7b5ba..a2028b8539d7 100644
--- a/drivers/gpu/drm/nova/Kconfig
+++ b/drivers/gpu/drm/nova/Kconfig
@@ -4,6 +4,7 @@ config DRM_NOVA
 	depends on DRM=y
 	depends on PCI
 	depends on RUST
+	depends on !CPU_BIG_ENDIAN
 	select AUXILIARY_BUS
 	select NOVA_CORE
 	default n
diff --git a/drivers/gpu/nova-core/Kconfig b/drivers/gpu/nova-core/Kconfig
index a4f2380654e2..d8456f8eaa05 100644
--- a/drivers/gpu/nova-core/Kconfig
+++ b/drivers/gpu/nova-core/Kconfig
@@ -3,6 +3,7 @@ config NOVA_CORE
 	depends on 64BIT
 	depends on PCI
 	depends on RUST
+	depends on !CPU_BIG_ENDIAN
 	select AUXILIARY_BUS
 	select RUST_FW_LOADER_ABSTRACTIONS
 	default n

---
base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd
change-id: 20260406-fix-kconfig-3a059f622697

Best regards,
--  
Eliot Courtney <ecourtney@nvidia.com>