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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, David Hildenbrand <david@redhat.com>,
	Joel Stanley <joel@jms.id.au>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>, Andrew Jeffery <andrew@aj.id.au>,
	Lucas Stach <l.stach@pengutronix.de>,
	Russell King <linux+etnaviv@armlinux.org.uk>,
	Christian Gmeiner <christian.gmeiner@gmail.com>,
	Mike Rapoport <rppt@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Michal Simek <michal.simek@xilinx.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	Peter Collingbourne <pcc@google.com>,
	linux-aspeed@lists.ozlabs.org, dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	etnaviv@lists.freedesktop.org, linux-fbdev@vger.kernel.org
Subject: [PATCH v2 2/2] drivers/gpu/drm: don't select DMA_CMA or CMA from aspeed or etnaviv
Date: Thu,  8 Apr 2021 12:05:23 +0200	[thread overview]
Message-ID: <20210408100523.63356-3-david@redhat.com> (raw)
In-Reply-To: <20210408100523.63356-1-david@redhat.com>

Random drivers should not override a user configuration of core knobs
(e.g., CONFIG_DMA_CMA=n). Use "imply" instead, to still respect
dependencies and manual overrides.

"This is similar to "select" as it enforces a lower limit on another
 symbol except that the "implied" symbol's value may still be set to n
 from a direct dependency or with a visible prompt."

Implying DMA_CMA should be sufficient, as that depends on CMA.

Note: If this is a real dependency, we should use "depends on DMA_CMA"
instead -  but I assume the driver can work without CMA just fine --
esp. when we wouldn't have HAVE_DMA_CONTIGUOUS right now.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 drivers/gpu/drm/aspeed/Kconfig  | 3 +--
 drivers/gpu/drm/etnaviv/Kconfig | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/aspeed/Kconfig b/drivers/gpu/drm/aspeed/Kconfig
index 5e95bcea43e9..b35bb1aa9b91 100644
--- a/drivers/gpu/drm/aspeed/Kconfig
+++ b/drivers/gpu/drm/aspeed/Kconfig
@@ -6,9 +6,8 @@ config DRM_ASPEED_GFX
 	depends on MMU
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
-	select DMA_CMA if HAVE_DMA_CONTIGUOUS
-	select CMA if HAVE_DMA_CONTIGUOUS
 	select MFD_SYSCON
+	imply DMA_CMA
 	help
 	  Chose this option if you have an ASPEED AST2500 SOC Display
 	  Controller (aka GFX).
diff --git a/drivers/gpu/drm/etnaviv/Kconfig b/drivers/gpu/drm/etnaviv/Kconfig
index faa7fc68b009..5f5576b7221a 100644
--- a/drivers/gpu/drm/etnaviv/Kconfig
+++ b/drivers/gpu/drm/etnaviv/Kconfig
@@ -9,9 +9,8 @@ config DRM_ETNAVIV
 	select THERMAL if DRM_ETNAVIV_THERMAL
 	select TMPFS
 	select WANT_DEV_COREDUMP
-	select CMA if HAVE_DMA_CONTIGUOUS
-	select DMA_CMA if HAVE_DMA_CONTIGUOUS
 	select DRM_SCHED
+	imply DMA_CMA
 	help
 	  DRM driver for Vivante GPUs.
 
-- 
2.30.2


  parent reply	other threads:[~2021-04-08 10:05 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 10:05 [PATCH v2 0/2] drivers: don't select DMA_CMA or CMA David Hildenbrand
2021-04-08 10:05 ` [PATCH v2 1/2] drivers/video/fbdev: don't select DMA_CMA David Hildenbrand
2021-04-08 10:05 ` David Hildenbrand [this message]
2021-04-08 10:16 ` [PATCH v2 0/2] drivers: don't select DMA_CMA or CMA Mike Rapoport

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