linux-kernel - [PATCH] drm/panfrost: fix GENERIC

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Date:   Tue, 17 Jan 2023 17:44:43 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Adrián Larumbe <adrian.larumbe@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/panfrost: fix GENERIC_ATOMIC64 dependency

From: Arnd Bergmann <arnd@...db.de>

On ARMv5 and earlier, a randconfig build can still run into

WARNING: unmet direct dependencies detected for IOMMU_IO_PGTABLE_LPAE
  Depends on [n]: IOMMU_SUPPORT [=y] && (ARM [=y] || ARM64 || COMPILE_TEST [=y]) && !GENERIC_ATOMIC64 [=y]
  Selected by [y]:
  - DRM_PANFROST [=y] && HAS_IOMEM [=y] && DRM [=y] && (ARM [=y] || ARM64 || COMPILE_TEST [=y] && !GENERIC_ATOMIC64 [=y]) && MMU [=y]

Rework the dependencies to always require a working cmpxchg64.

Fixes: db594ba3fcf9 ("drm/panfrost: depend on !GENERIC_ATOMIC64 when using COMPILE_TEST")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/panfrost/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/Kconfig b/drivers/gpu/drm/panfrost/Kconfig
index 079600328be1..e6403a9d66ad 100644
--- a/drivers/gpu/drm/panfrost/Kconfig
+++ b/drivers/gpu/drm/panfrost/Kconfig
@@ -3,7 +3,8 @@
 config DRM_PANFROST
 	tristate "Panfrost (DRM support for ARM Mali Midgard/Bifrost GPUs)"
 	depends on DRM
-	depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
+	depends on ARM || ARM64 || COMPILE_TEST
+	depends on !GENERIC_ATOMIC64    # for IOMMU_IO_PGTABLE_LPAE
 	depends on MMU
 	select DRM_SCHED
 	select IOMMU_SUPPORT
-- 
2.39.0