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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2019-07-03 09:58:34 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2019-08-01 15:01:42 +0200 |
| commit | 58540594570778fd149cd8c9b2bff61f2cefa8c9 (patch) | |
| tree | 3565871b193869c0c131f6a6c89a2039ff2887e2 | |
| parent | 01b947afaa940327e7adf57070a4bf3d0bed9810 (diff) | |
| download | linux-58540594570778fd149cd8c9b2bff61f2cefa8c9.tar.gz linux-58540594570778fd149cd8c9b2bff61f2cefa8c9.tar.bz2 linux-58540594570778fd149cd8c9b2bff61f2cefa8c9.zip | |
drm/bochs: Use shadow buffer for bochs framebuffer console
The bochs driver (and virtual hardware) requires buffer objects to
reside in video ram to display them to the screen. So it can not
display the framebuffer console because the respective buffer object
is permanently pinned in system memory.
Using a shadow buffer for the console solves this problem. The console
emulation will pin the buffer object only during updates from the shadow
buffer. Otherwise, the bochs driver can freely relocated the buffer
between system memory and video ram.
v2:
* select shadow FB via struct drm_mode_config.prefer_shadow_fbdev
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/315833/
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -rw-r--r-- | drivers/gpu/drm/bochs/bochs_kms.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c index bc19dbd531ef..359030d5d818 100644 --- a/drivers/gpu/drm/bochs/bochs_kms.c +++ b/drivers/gpu/drm/bochs/bochs_kms.c @@ -191,6 +191,7 @@ int bochs_kms_init(struct bochs_device *bochs) bochs->dev->mode_config.fb_base = bochs->fb_base; bochs->dev->mode_config.preferred_depth = 24; bochs->dev->mode_config.prefer_shadow = 0; + bochs->dev->mode_config.prefer_shadow_fbdev = 1; bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true; bochs->dev->mode_config.funcs = &bochs_mode_funcs; |