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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
151 lines
4.9 KiB
Plaintext
151 lines
4.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Video configuration
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#
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menu "Console display driver support"
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config VGA_CONSOLE
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bool "VGA text console" if EXPERT || !X86
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depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !SUPERH && \
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(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
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!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !NDS32 && !S390 && !UML
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default y
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help
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Saying Y here will allow you to use Linux in text mode through a
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display that complies with the generic VGA standard. Virtually
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everyone wants that.
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The program SVGATextMode can be used to utilize SVGA video cards to
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their full potential in text mode. Download it from
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<ftp://ibiblio.org/pub/Linux/utils/console/>.
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Say Y.
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config MDA_CONSOLE
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depends on !M68K && !PARISC && ISA
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tristate "MDA text console (dual-headed)"
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help
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Say Y here if you have an old MDA or monochrome Hercules graphics
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adapter in your system acting as a second head ( = video card). You
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will then be able to use two monitors with your Linux system. Do not
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say Y here if your MDA card is the primary card in your system; the
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normal VGA driver will handle it.
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To compile this driver as a module, choose M here: the
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module will be called mdacon.
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If unsure, say N.
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config SGI_NEWPORT_CONSOLE
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tristate "SGI Newport Console support"
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depends on SGI_IP22 && HAS_IOMEM
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select FONT_SUPPORT
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help
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Say Y here if you want the console on the Newport aka XL graphics
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card of your Indy. Most people say Y here.
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config DUMMY_CONSOLE
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bool
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default y
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config DUMMY_CONSOLE_COLUMNS
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int "Initial number of console screen columns"
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depends on DUMMY_CONSOLE && !ARM
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default 160 if PARISC
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default 80
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help
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On PA-RISC, the default value is 160, which should fit a 1280x1024
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monitor.
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Select 80 if you use a 640x480 resolution by default.
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config DUMMY_CONSOLE_ROWS
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int "Initial number of console screen rows"
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depends on DUMMY_CONSOLE && !ARM
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default 64 if PARISC
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default 25
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help
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On PA-RISC, the default value is 64, which should fit a 1280x1024
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monitor.
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Select 25 if you use a 640x480 resolution by default.
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config FRAMEBUFFER_CONSOLE
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bool "Framebuffer Console support"
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depends on FB && !UML
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select VT_HW_CONSOLE_BINDING
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select CRC32
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select FONT_SUPPORT
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help
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Low-level framebuffer-based console driver.
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config FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
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bool "Enable legacy fbcon hardware acceleration code"
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depends on FRAMEBUFFER_CONSOLE
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default y if PARISC
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default n
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help
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This option enables the fbcon (framebuffer text-based) hardware
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acceleration for graphics drivers which were written for the fbdev
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graphics interface.
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On modern machines, on mainstream machines (like x86-64) or when
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using a modern Linux distribution those fbdev drivers usually aren't used.
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So enabling this option wouldn't have any effect, which is why you want
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to disable this option on such newer machines.
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If you compile this kernel for older machines which still require the
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fbdev drivers, you may want to say Y.
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If unsure, select n.
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config FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
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bool "Map the console to the primary display device"
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depends on FRAMEBUFFER_CONSOLE
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default n
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help
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If this option is selected, the framebuffer console will
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automatically select the primary display device (if the architecture
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supports this feature). Otherwise, the framebuffer console will
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always select the first framebuffer driver that is loaded. The latter
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is the default behavior.
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You can always override the automatic selection of the primary device
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by using the fbcon=map: boot option.
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If unsure, select n.
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config FRAMEBUFFER_CONSOLE_ROTATION
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bool "Framebuffer Console Rotation"
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depends on FRAMEBUFFER_CONSOLE
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help
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Enable display rotation for the framebuffer console. This is done
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in software and may be significantly slower than a normally oriented
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display. Note that the rotation is done at the console level only
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such that other users of the framebuffer will remain normally
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oriented.
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config FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
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bool "Framebuffer Console Deferred Takeover"
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depends on FB=y && FRAMEBUFFER_CONSOLE && DUMMY_CONSOLE
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help
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If enabled this defers the framebuffer console taking over the
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console from the dummy console until the first text is displayed on
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the console. This is useful in combination with the "quiet" kernel
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commandline option to keep the framebuffer contents initially put up
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by the firmware in place, rather then replacing the contents with a
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black screen as soon as fbcon loads.
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config STI_CONSOLE
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bool "STI text console"
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depends on PARISC && HAS_IOMEM
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select FONT_SUPPORT
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select CRC32
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default y
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help
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The STI console is the builtin display/keyboard on HP-PARISC
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machines. Say Y here to build support for it into your kernel.
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The alternative is to use your primary serial port as a console.
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endmenu
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