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

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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>
This commit is contained in:
Yifeng Li 2019-04-01 17:46:59 +02:00 committed by prashantpaddune
parent 90d0f5dc34
commit 07edaf759e
1 changed files with 5 additions and 1 deletions
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6
drivers/video/fbdev/sm712fb.c
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@ -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)