diff options
author | Yifeng Li <tomli@tomli.me> | 2019-04-01 17:46:59 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-25 18:26:51 +0200 |
commit | 40e3990757fb1617ad1807e1b36ba48ed2d3a384 (patch) | |
tree | 5fb1c673e7918bcc879b41d9379ad2d501ea6f26 /drivers/video | |
parent | bd2d04b1298c4cf3420850dce7514765268b918d (diff) |
fbdev: sm712fb: fix boot screen glitch when sm712fb replaces VGA
commit ec1587d5073f29820e358f3a383850d61601d981 upstream.
When the machine is booted in VGA mode, loading sm712fb would cause
a glitch of random pixels shown on the screen. To prevent it from
happening, we first clear the entire framebuffer, and we also need
to stop calling smtcfb_setmode() during initialization, the fbdev
layer will call it for us later when it's ready.
Signed-off-by: Yifeng Li <tomli@tomli.me>
Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video')
-rw-r--r-- | drivers/video/fbdev/sm712fb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c index a6bfa379b246..82fcd73770cc 100644 --- a/drivers/video/fbdev/sm712fb.c +++ b/drivers/video/fbdev/sm712fb.c @@ -1492,7 +1492,11 @@ static int smtcfb_pci_probe(struct pci_dev *pdev, if (err) goto failed; - smtcfb_setmode(sfb); + /* + * The screen would be temporarily garbled when sm712fb takes over + * vesafb or VGA text mode. Zero the framebuffer. + */ + memset_io(sfb->lfb, 0, sfb->fb->fix.smem_len); err = register_framebuffer(info); if (err < 0) |