summaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 01:44:58 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 01:44:58 +0300
commit06e386a1db54ab6a671e103e929b590f7a88f0e3 (patch)
tree40891a97d85cb4fcbef142b031965c242c1905f3 /Documentation
parent99897b1e99311e67056808531141c8e16c221d42 (diff)
parentf39684524b391c5a7ed0ac44db4fec3357af1c5d (diff)
downloadlinux-06e386a1db54ab6a671e103e929b590f7a88f0e3.tar.xz
Merge tag 'fbdev-v4.19' of https://github.com/bzolnier/linux
Pull fbdev updates from Bartlomiej Zolnierkiewicz: "Mostly small fixes and cleanups for fb drivers (the biggest updates are for udlfb and pxafb drivers). This also adds deferred console takeover support to the console code and efifb driver. Summary: - add support for deferred console takeover, when enabled defers fbcon taking over the console from the dummy console until the first text is displayed on the console - together with the "quiet" kernel commandline option this allows fbcon to still be used together with a smooth graphical bootup (Hans de Goede) - improve console locking debugging code (Thomas Zimmermann) - copy the ACPI BGRT boot graphics to the framebuffer when deferred console takeover support is used in efifb driver (Hans de Goede) - update udlfb driver - fix lost console when the user unplugs a USB adapter, fix the screen corruption issue, fix locking and add some performance optimizations (Mikulas Patocka) - update pxafb driver - fix using uninitialized memory, switch to devm_* API, handle initialization errors and add support for lcd-supply regulator (Daniel Mack) - add support for boards booted with a DeviceTree in pxa3xx_gcu driver (Daniel Mack) - rename omap2 module to omap2fb.ko to avoid conflicts with omap1 driver (Arnd Bergmann) - enable ACPI-based enumeration for goldfishfb driver (Yu Ning) - fix goldfishfb driver to make user space Android code use 60 fps (Christoffer Dall) - print big fat warning when nomodeset kernel parameter is used in vgacon driver (Lyude Paul) - remove VLA usage from fsl-diu-fb driver (Kees Cook) - misc fixes (Julia Lawall, Geert Uytterhoeven, Fredrik Noring, Yisheng Xie, Dan Carpenter, Daniel Vetter, Anton Vasilyev, Randy Dunlap, Gustavo A. R. Silva, Colin Ian King, Fengguang Wu) - misc cleanups (Roman Kiryanov, Yisheng Xie, Colin Ian King)" * tag 'fbdev-v4.19' of https://github.com/bzolnier/linux: (54 commits) Documentation/fb: corrections for fbcon.txt fbcon: Do not takeover the console from atomic context dummycon: Stop exporting dummycon_[un]register_output_notifier fbcon: Only defer console takeover if the current console driver is the dummycon fbcon: Only allow FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER if fbdev is builtin fbdev: omap2: omapfb: fix ifnullfree.cocci warnings fbdev: omap2: omapfb: fix bugon.cocci warnings fbdev: omap2: omapfb: fix boolreturn.cocci warnings fb: amifb: fix build warnings when not builtin fbdev/core: Disable console-lock warnings when fb.lockless_register_fb is set console: Replace #if 0 with atomic var 'ignore_console_lock_warning' udlfb: use spin_lock_irq instead of spin_lock_irqsave udlfb: avoid prefetch udlfb: optimization - test the backing buffer udlfb: allow reallocating the framebuffer udlfb: set line_length in dlfb_ops_set_par udlfb: handle allocation failure udlfb: set optimal write delay udlfb: make a local copy of fb_ops udlfb: don't switch if we are switching to the same videomode ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt3
-rw-r--r--Documentation/devicetree/bindings/display/marvell,pxa300-gcu.txt17
-rw-r--r--Documentation/fb/fbcon.txt29
3 files changed, 35 insertions, 14 deletions
diff --git a/Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt b/Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt
index f79641bd5f18..45ffd6c41748 100644
--- a/Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt
+++ b/Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt
@@ -10,6 +10,9 @@ Required properties:
- interrupts : framebuffer controller interrupt.
- clocks: phandle to input clocks
+Optional properties:
+ - lcd-supply: A phandle to a power regulator that controls the LCD voltage.
+
Required nodes:
- port: connection to the LCD panel (see video-interfaces.txt)
This node must have its properties bus-width and remote-endpoint set.
diff --git a/Documentation/devicetree/bindings/display/marvell,pxa300-gcu.txt b/Documentation/devicetree/bindings/display/marvell,pxa300-gcu.txt
new file mode 100644
index 000000000000..9cfae5c4e8ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/marvell,pxa300-gcu.txt
@@ -0,0 +1,17 @@
+PXA3xx GCU Controller
+---------------------
+
+Required properties:
+ - compatible : "marvell,pxa300-gcu"
+ - reg : should contain the register range (address and length).
+ - interrupts : Controller interrupt.
+ - clocks: phandle to the PXA specific input clock.
+
+Example for PXA300:
+
+ display-controller@54000000 {
+ compatible = "marvell,pxa300-gcu";
+ reg = <0x54000000 0x1000>;
+ interrupts = <39>;
+ clocks = <&clks CLK_PXA300_GCU>;
+ };
diff --git a/Documentation/fb/fbcon.txt b/Documentation/fb/fbcon.txt
index d4d642e1ce9c..62af30511a95 100644
--- a/Documentation/fb/fbcon.txt
+++ b/Documentation/fb/fbcon.txt
@@ -18,9 +18,10 @@ made available by the underlying graphics card are also possible.
A. Configuration
The framebuffer console can be enabled by using your favorite kernel
-configuration tool. It is under Device Drivers->Graphics Support->Support for
-framebuffer devices->Framebuffer Console Support. Select 'y' to compile
-support statically, or 'm' for module support. The module will be fbcon.
+configuration tool. It is under Device Drivers->Graphics Support->Frame
+buffer Devices->Console display driver support->Framebuffer Console Support.
+Select 'y' to compile support statically or 'm' for module support. The
+module will be fbcon.
In order for fbcon to activate, at least one framebuffer driver is
required, so choose from any of the numerous drivers available. For x86
@@ -29,10 +30,10 @@ always be available. However, using a chipset-specific driver will give you
more speed and features, such as the ability to change the video mode
dynamically.
- To display the penguin logo, choose any logo available in Logo
-Configuration->Boot up logo.
+ To display the penguin logo, choose any logo available in Graphics
+support->Bootup logo.
- Also, you will need to select at least one compiled-in fonts, but if
+ Also, you will need to select at least one compiled-in font, but if
you don't do anything, the kernel configuration tool will select one for you,
usually an 8x16 font.
@@ -135,16 +136,16 @@ C. Boot options
The angle can be changed anytime afterwards by 'echoing' the same
numbers to any one of the 2 attributes found in
- /sys/class/graphics/fbcon
+ /sys/class/graphics/fbcon:
rotate - rotate the display of the active console
rotate_all - rotate the display of all consoles
- Console rotation will only become available if Console Rotation
- Support is compiled in your kernel.
+ Console rotation will only become available if Framebuffer Console
+ Rotation support is compiled in your kernel.
NOTE: This is purely console rotation. Any other applications that
- use the framebuffer will remain at their 'normal'orientation.
+ use the framebuffer will remain at their 'normal' orientation.
Actually, the underlying fb driver is totally ignorant of console
rotation.
@@ -164,7 +165,7 @@ C. Boot options
C. Attaching, Detaching and Unloading
-Before going on how to attach, detach and unload the framebuffer console, an
+Before going on to how to attach, detach and unload the framebuffer console, an
illustration of the dependencies may help.
The console layer, as with most subsystems, needs a driver that interfaces with
@@ -182,7 +183,7 @@ because fbcon is an intermediate layer between the console and the drivers:
console ---> fbcon ---> fbdev drivers ---> hardware
-The fbdev drivers cannot be unloaded if it's bound to fbcon, and fbcon cannot
+The fbdev drivers cannot be unloaded if bound to fbcon, and fbcon cannot
be unloaded if it's bound to the console layer.
So to unload the fbdev drivers, one must first unbind fbcon from the console,
@@ -232,7 +233,7 @@ restored properly. The following is one of the several methods that you can do:
echo 0 > /sys/class/vtconsole/vtcon1/bind
6. That's it, you're back to VGA mode. And if you compiled fbcon as a module,
- you can unload it by 'rmmod fbcon'
+ you can unload it by 'rmmod fbcon'.
7. To reattach fbcon:
@@ -290,7 +291,7 @@ Samples:
========
Here are 2 sample bash scripts that you can use to bind or unbind the
-framebuffer console driver if you are in an X86 box:
+framebuffer console driver if you are on an X86 box:
---------------------------------------------------------------------------
#!/bin/bash