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From: Chris Ruffin <chris.ruffin@intel.com>
To: dri-devel@lists.freedesktop.org
Cc: Dave Airlie <airlied@redhat.com>, cmruffin@gmail.com
Subject: [PATCH] drm/bochs: disable video before changing video mode
Date: Tue, 24 Mar 2015 17:00:55 -0400	[thread overview]
Message-ID: <20150324170055.00007cd5@intel.com> (raw)


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@intel.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
---
 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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             reply	other threads:[~2015-03-24 21:00 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-24 21:00 Chris Ruffin [this message]
  -- strict thread matches above, loose matches on Subject: below --
2015-03-24 20:57 [PATCH] drm/bochs: disable video before changing video mode Chris Ruffin

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