dab5a44067
n As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
53 lines
1.4 KiB
Diff
53 lines
1.4 KiB
Diff
From 0a628ed00bf01046212f7464ac72d89a80702a46 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Tue, 19 Apr 2016 13:24:14 -0700
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Subject: [PATCH] drm/vc4: Kick out the simplefb framebuffer before we set up
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KMS.
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If we don't, then simplefb stays loaded on /dev/fb0 even though
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scanout isn't happening from simplefb's memory area any more, and you
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end up with no console.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Acked-by: Dave Airlie <airlied@redhat.com>
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(cherry picked from commit b3a15f6d55fb584dd4d8baac5d1b6a398720620c)
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---
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drivers/gpu/drm/vc4/vc4_drv.c | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_drv.c
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+++ b/drivers/gpu/drm/vc4/vc4_drv.c
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@@ -164,6 +164,24 @@ static void vc4_match_add_drivers(struct
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}
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}
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+static void vc4_kick_out_firmware_fb(void)
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+{
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+ struct apertures_struct *ap;
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+
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+ ap = alloc_apertures(1);
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+ if (!ap)
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+ return;
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+
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+ /* Since VC4 is a UMA device, the simplefb node may have been
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+ * located anywhere in memory.
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+ */
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+ ap->ranges[0].base = 0;
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+ ap->ranges[0].size = ~0;
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+
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+ remove_conflicting_framebuffers(ap, "vc4drmfb", false);
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+ kfree(ap);
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+}
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+
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static int vc4_drm_bind(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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@@ -208,6 +226,8 @@ static int vc4_drm_bind(struct device *d
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if (ret)
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goto gem_destroy;
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+ vc4_kick_out_firmware_fb();
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+
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ret = drm_dev_register(drm, 0);
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if (ret < 0)
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goto unbind_all;
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