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authorHelge Deller <deller@gmx.de>2022-02-02 16:55:31 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2022-02-02 17:16:26 +0300
commita3f781a9d6114c1d1e01defb7aa234dec45d2a5f (patch)
tree793b04ca3aa06e007ab561bbb14929aba2ae3266 /drivers/video/console
parent87ab9f6b7417349aa197a6c7098d4fdd4beebb74 (diff)
downloadlinux-a3f781a9d6114c1d1e01defb7aa234dec45d2a5f.tar.xz
fbcon: Add option to enable legacy hardware acceleration
Add a config option CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION to enable bitblt and fillrect hardware acceleration in the framebuffer console. If disabled, such acceleration will not be used, even if it is supported by the graphics hardware driver. If you plan to use DRM as your main graphics output system, you should disable this option since it will prevent compiling in code which isn't used later on when DRM takes over. For all other configurations, e.g. if none of your graphic cards support DRM (yet), DRM isn't available for your architecture, or you can't be sure that the graphic card in the target system will support DRM, you most likely want to enable this option. In the non-accelerated case (e.g. when DRM is used), the inlined fb_scrollmode() function is hardcoded to return SCROLL_REDRAW and as such the compiler is able to optimize much unneccesary code away. In this v3 patch version I additionally changed the GETVYRES() and GETVXRES() macros to take a pointer to the fbcon_display struct. This fixes the build when console rotation is enabled and helps the compiler again to optimize out code. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20220202135531.92183-4-deller@gmx.de
Diffstat (limited to 'drivers/video/console')
-rw-r--r--drivers/video/console/Kconfig20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig
index 840d9813b0bc..fcc46380e7c9 100644
--- a/drivers/video/console/Kconfig
+++ b/drivers/video/console/Kconfig
@@ -78,6 +78,26 @@ config FRAMEBUFFER_CONSOLE
help
Low-level framebuffer-based console driver.
+config FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
+ bool "Enable legacy fbcon hardware acceleration code"
+ depends on FRAMEBUFFER_CONSOLE
+ default y if PARISC
+ default n
+ help
+ This option enables the fbcon (framebuffer text-based) hardware
+ acceleration for graphics drivers which were written for the fbdev
+ graphics interface.
+
+ On modern machines, on mainstream machines (like x86-64) or when
+ using a modern Linux distribution those fbdev drivers usually aren't used.
+ So enabling this option wouldn't have any effect, which is why you want
+ to disable this option on such newer machines.
+
+ If you compile this kernel for older machines which still require the
+ fbdev drivers, you may want to say Y.
+
+ If unsure, select n.
+
config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
bool "Map the console to the primary display device"
depends on FRAMEBUFFER_CONSOLE