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From 8fde5a249d84674a92b4732def88cbc47f2bb530 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 19 Apr 2016 13:24:14 -0700
Subject: [PATCH] drm/vc4: Kick out the simplefb framebuffer before we set up
KMS.
If we don't, then simplefb stays loaded on /dev/fb0 even though
scanout isn't happening from simplefb's memory area any more, and you
end up with no console.
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit b3a15f6d55fb584dd4d8baac5d1b6a398720620c)
---
drivers/gpu/drm/vc4/vc4_drv.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -164,6 +164,24 @@ static void vc4_match_add_drivers(struct
}
}
+static void vc4_kick_out_firmware_fb(void)
+{
+ struct apertures_struct *ap;
+
+ ap = alloc_apertures(1);
+ if (!ap)
+ return;
+
+ /* Since VC4 is a UMA device, the simplefb node may have been
+ * located anywhere in memory.
+ */
+ ap->ranges[0].base = 0;
+ ap->ranges[0].size = ~0;
+
+ remove_conflicting_framebuffers(ap, "vc4drmfb", false);
+ kfree(ap);
+}
+
static int vc4_drm_bind(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
@@ -208,6 +226,8 @@ static int vc4_drm_bind(struct device *d
if (ret)
goto gem_destroy;
+ vc4_kick_out_firmware_fb();
+
ret = drm_dev_register(drm, 0);
if (ret < 0)
goto unbind_all;
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