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From patchwork Wed Mar  6 14:02:45 2019
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Subject: drm/vc4: Use 16bpp by default for the fbdev buffer
From: Maxime Ripard <>
X-Patchwork-Id: 290632
Message-Id: <>
To: Eric Anholt <>
Cc:, Maxime Ripard <>,,
 Paul Kocialkowski <>,
 Sean Paul <>,
 Thomas Petazzoni <>,
Date: Wed,  6 Mar 2019 15:02:45 +0100

The preferred bpp for the fbdev emulation buffer has been 32 so far, which
means that by default we will allocate an 8MB buffer with a 1920x1080

Worse this memory will be allocated from the CMA pool, and will never be
freed even if we don't use the fbdev emulation. Therefore, reducing it is a
big deal, and switching to 16bpp by default will gain us around 4MB at
1920x1080, while keeping decent color depth. And users still have the
option to switch to 32bpp using the kernel command line.

Signed-off-by: Maxime Ripard <>
Reviewed-by: Paul Kocialkowski <>
 drivers/gpu/drm/vc4/vc4_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 52576dee809e..c38cf64837e1 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -286,7 +286,7 @@ static int vc4_drm_bind(struct device *dev)
-	drm_fbdev_generic_setup(drm, 32);
+	drm_fbdev_generic_setup(drm, 16);
 	return 0;