Commit ec1587d5 authored by Yifeng Li's avatar Yifeng Li Committed by Bartlomiej Zolnierkiewicz

fbdev: sm712fb: fix boot screen glitch when sm712fb replaces VGA

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: default avatarYifeng Li <tomli@tomli.me>
Tested-by: default avatarSudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: <stable@vger.kernel.org>  # v4.4+
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
parent dcf90705
......@@ -1493,7 +1493,11 @@ 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)
......
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