From: Yifeng Li <to...@tomli.me>
[ Upstream commit ec1587d5073f29820e358f3a383850d61601d981 ]
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 <to...@tomli.me>
Tested-by: Sudip Mukherjee <sudipm.mukher...@gmail.com>
Cc: Teddy Wang <teddy.w...@siliconmotion.com>
Cc: <sta...@vger.kernel.org> # v4.4+
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnier...@samsung.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/video/fbdev/sm712fb.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c
index 2539c1e6facb4..6a30714a18632 100644
--- a/drivers/video/fbdev/sm712fb.c
+++ b/drivers/video/fbdev/sm712fb.c
@@ -1498,7 +1498,11 @@ 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)
--
2.20.1
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
