diff options
| author | Simon Glass <sjg@chromium.org> | 2020-07-02 21:12:33 -0600 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2020-07-09 12:33:24 +0800 |
| commit | 551ca0e64744324b0f337bfa4a743db24a2800ca (patch) | |
| tree | 9017b10d8f4500786304cc036643887b1dd78ae7 /drivers/video/video-uclass.c | |
| parent | 7812bbdc373236516b6efa13d879d35d43ca7d01 (diff) | |
x86: video: Support copy framebuffer with probed devices
For PCI video devices that are not mentioned in the devicetree, U-Boot
does not bind a driver before relocation, since PCI is not fully probed
at that point. Furthermore it is possible for the video device to be on
a secondary bus which is not even scanned.
This is fine if the framebuffer is allocated in fixed memory, as it
normally is on x86. But when using this as a copy framebuffer, we also
need U-Boot to allocate its own cached framebuffer for working in. Since
the video driver is never bound before relocation, the framebuffer size
is never set and U-Boot does no allocation.
Add a new CONFIG option to reserve 16MB of memory for this eventuality.
This allows vesa devices to use the copy framebuffer.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/video/video-uclass.c')
| -rw-r--r-- | drivers/video/video-uclass.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c index 4735a22dc1..650891e49d 100644 --- a/drivers/video/video-uclass.c +++ b/drivers/video/video-uclass.c @@ -97,6 +97,11 @@ int video_reserve(ulong *addrp) debug("%s: Reserving %lx bytes at %lx for video device '%s'\n", __func__, size, *addrp, dev->name); } + + /* Allocate space for PCI video devices in case there were not bound */ + if (*addrp == gd->video_top) + *addrp -= CONFIG_VIDEO_PCI_DEFAULT_FB_SIZE; + gd->video_bottom = *addrp; gd->fb_base = *addrp; debug("Video frame buffers from %lx to %lx\n", gd->video_bottom, |