linux-toradex.git/drivers/video/console/dummycon.c, branch v5.0

dummycon: Stop exporting dummycon_[un]register_output_notifier

2018-08-10T15:23:02+00:00

Now that we only allow FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER when
fbdev+fbcon are builtin exporting these is no longer necessary.

Signed-off-by: Hans de Goede 
Signed-off-by: Bartlomiej Zolnierkiewicz

console: dummycon: export dummycon_[un]register_output_notifier

2018-06-29T09:46:19+00:00

Export dummycon_[un]register_output_notifier, the fbcon code needs this
and may be build as a module.

Fixes: 83d83bebf401 ("console/fbcon: Add support for deferred console takeover")
Cc: Stephen Rothwell 
Reported-by: Stephen Rothwell 
Signed-off-by: Hans de Goede 
Signed-off-by: Bartlomiej Zolnierkiewicz

console/fbcon: Add support for deferred console takeover

2018-06-28T13:20:30+00:00

Currently fbcon claims fbdevs as soon as they are registered and takes over
the console as soon as the first fbdev gets registered.

This behavior is undesirable in cases where a smooth graphical bootup is
desired, in such cases we typically want the contents of the framebuffer
(typically a vendor logo) to stay in place as is.

The current solution for this problem (on embedded systems) is to not
enable fbcon.

This commit adds a new FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER config option,
which 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, having it take over the console as
soon as e.g. an error message is logged.

Note the choice to detect the first console output in the dummycon driver,
rather then handling this entirely inside the fbcon code, was made after
2 failed attempts to handle this entirely inside the fbcon code. The fbcon
code is woven quite tightly into the console code, making this to only
feasible option.

Reviewed-by: Daniel Vetter 
Signed-off-by: Hans de Goede 
Signed-off-by: Bartlomiej Zolnierkiewicz

console: Expand dummy functions for CFI

2018-02-27T09:17:33+00:00

This expands the no-op dummy functions into full prototypes to avoid
indirect call mismatches when running under Control Flow Integrity
checking, like with Clang's -fsanitize=cfi.

Co-Developed-by: Sami Tolvanen 
Signed-off-by: Sami Tolvanen 
Signed-off-by: Kees Cook 
Signed-off-by: Greg Kroah-Hartman

console/dummy: leave .con_font_get set to NULL

2018-01-15T16:04:22+00:00

When this method is set, the caller expects struct console_font fields
to be properly initialized when it returns. Leave it unset otherwise
nonsensical (leaked kernel stack) values are returned to user space.

Signed-off-by: Nicolas Pitre 
Cc: stable@vger.kernel.org
Signed-off-by: Bartlomiej Zolnierkiewicz

tty: vt, remove consw->con_bmove

2016-06-25T16:04:48+00:00

It is never called since commit 81732c3b2fede (tty vt: Fix line
garbage in virtual console on command line edition) in 3.7. So remove
all the callbacks.

Signed-off-by: Jiri Slaby 
Cc: Thomas Winischhofer 
Cc: linux-usb@vger.kernel.org
Cc: Jean-Christophe Plagniol-Villard 
Cc: Tomi Valkeinen 
Cc: "James E.J. Bottomley" 
Cc: Helge Deller 
Cc: linux-fbdev@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

tty: vt, consw->con_set_palette cleanup

2016-06-25T16:04:48+00:00

* allow NULL consw->con_set_palette (some consoles define an empty
  hook)
* => remove empty hooks now
* return value of consw->con_set_palette is never checked => make the
  function void
* document consw->con_set_palette a bit

Signed-off-by: Jiri Slaby 
Cc: Thomas Winischhofer 
Cc: linux-usb@vger.kernel.org
Cc: Jean-Christophe Plagniol-Villard 
Cc: Tomi Valkeinen 
Cc: "James E.J. Bottomley" 
Cc: Helge Deller 
Cc: linux-fbdev@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

tty: vt, consw->con_scrolldelta cleanup

2016-06-25T16:04:48+00:00

* allow NULL consw->con_scrolldelta (some consoles define an empty
  hook)
* => remove empty hooks now
* return value of consw->con_scrolldelta is never checked => make the
  function void
* document consw->con_scrolldelta a bit

Signed-off-by: Jiri Slaby 
Cc: Thomas Winischhofer 
Cc: linux-usb@vger.kernel.org
Cc: Jean-Christophe Plagniol-Villard 
Cc: Tomi Valkeinen 
Cc: "James E.J. Bottomley" 
Cc: Helge Deller 
Cc: linux-fbdev@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

console/dummy: Move screen size selection from CPP to Kconfig

2015-01-13T12:54:48+00:00

PA-RISC already handled the dummy console screen size selection in
Kconfig, so generalize this to other platforms.

ARM keeps on using screen_info, which is filled in by
platform-specific code, or from ATAGS.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Tomi Valkeinen

drm/i915: Kick out vga console

2014-06-09T19:03:47+00:00

Touching the VGA resources on an IVB EFI machine causes hard hangs when
we then kick out the efifb. Ouch.

Apparently this also prevents unclaimed register errors on hsw and
hard machine hangs on my i855gm when trying to unbind fbcon.

Also, we want this to make I915_FBDEV=n safe.

v2: Rebase and pimp commit message.

v3: We also need to unregister the vga console, otherwise the unbind
of the fb console before module unload might resurrect it again.

v4: Ignore errors when the vga console is already unregistered - this
can happen when e.g. reloading i915.ko.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=67813
Cc: David Herrmann 
Cc: Jean-Christophe Plagniol-Villard 
Cc: Tomi Valkeinen 
Cc: linux-fbdev@vger.kernel.org
Cc: Jani Nikula 
Signed-off-by: Chris Wilson  (v1)
Reviewed-by: David Herrmann 
Acked-by: Tomi Valkeinen 
Signed-off-by: Daniel Vetter