[PATCH] bochs-drm: disable video before changing video mode
From: Chris Ruffin
Date: Wed Mar 18 2015 - 12:37:54 EST
qemu and simics simulators both seem to expect that video should be disabled
before changing the video mode.
references:
http://git.qemu.org/?p=qemu.git;a=blob;f=hw/display/vga.c;h=c0f7b343bbab586c8593d29c7a765f1e6ca3662c;hb=HEAD#l727
http://wiki.osdev.org/Bochs_VBE_Extensions#Setting_display_resolution_and_bit_depth
Signed-off-by: Chris Ruffin <chris.ruffin@xxxxxxxxx>
---
drivers/gpu/drm/bochs/bochs_hw.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
index 4603897..a39b034 100644
--- a/drivers/gpu/drm/bochs/bochs_hw.c
+++ b/drivers/gpu/drm/bochs/bochs_hw.c
@@ -164,6 +164,7 @@ void bochs_hw_setmode(struct bochs_device *bochs,
bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
+ bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE, 0);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP, bochs->bpp);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES, bochs->xres);
bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES, bochs->yres);
--
1.7.10.4
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