linux-toradex.git/drivers/video/console, branch master

vgacon: Implement struct consw.con_unblank

2026-10-25T07:36:08+00:00

Implement con_unblank from struct consw with the VESA_NO_BLANKING
case from vgacon_blank(). The new function is called vgacon_unblank().
Remove the duplicated code from vgacon_blank().

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller

sticon: Implement struct consw.con_unblank

2026-10-25T07:36:08+00:00

Implement con_unblank from struct consw. The new function is called
sticon_unblank(). Remove the related code from sticon_blank().

There is no display unblanking in sticon: only return true to redraw
the console.

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller

newport_con: Implement struct consw.con_unblank

2026-10-25T07:36:08+00:00

Implement con_unblank from struct consw with the VESA_NO_BLANKING
branch from newport_blank(). Remove that code from the blank helper.

Both helpers, newport_blank() and newport_unbank(), clear or set
a single flag in a hardware register. No further VESA DPMS blanking
is supported.

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller

dummycon: Implement struct consw.con_unblank

2026-10-25T07:36:07+00:00

Implement con_unblank from struct consw as a duplicate of con_blank.
As dummycon does not do anything, the implementation only returns
true or false to trigger a redraw (or not).

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller

vgacon: Use vt_cursor_{start,end}()

2026-10-19T11:56:01+00:00

Replace vgacon's custom cursor metrics with the shared helpers
vc_cursor_start() and vc_font_cursor_end(). Note that the _end()
function returns the index of the scanline below the cursor, while
VGA hardware expects the cursor's final scanline. Hence vgacon
subtracts 1 from the end value.

The cursor shapes remain mostly unchanged, except that non-underline
cursors now also use the glyph's top-most and bottom-most scanline.
This follows the style used by fbcon.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Helge Deller 
Signed-off-by: Helge Deller

vgacon: Remove trailing whitespaces

2026-10-19T11:56:01+00:00

Fix coding style.

Signed-off-by: Thomas Zimmermann 
Reviewed-by: Helge Deller 
Signed-off-by: Helge Deller

console: mdacon: remove this obsolete driver

2026-05-20T18:23:32+00:00

The mdacon driver supports using ISA MDA or Hercules-compatible display
adapters as a secondary text console. This was commonly used in the
1990s and earlier for debugging software which took over the primary
display. It is highly unlikely anyone is doing so nowadays because
serial consoles and much better methods of debugging exist.

The driver is not enabled by any defconfig, nor any of the
dozens of distro configs collected at [1]. It has been relegated to VTs
13-16 since commit 0b9cf3aa6b1e ("mdacon messing up default vc's - set
default to vc13-16 again") in Linux 2.6.27 (and before Linux 2.5.53 -
see the link in the message of the above commit). The change in 2.6.27
was done because it was incorrectly detecting non-MDA adapters as MDA
and taking over all VTs, rendering them unusable.

Furthermore, vgacon supports using MDA/Hercules-compatible adapters as
the primary text console, so any systems with only one of these
adapters were already using vgacon and will not experience any loss in
functionality from the removal of this driver.

Given all of these factors, the mdacon driver is likely entirely
unused. Remove it.

[1] https://github.com/nyrahul/linux-kernel-configs/tree/f0bee86a135a0406ea427855f52702dd00d770f9

Signed-off-by: Ethan Nelson-Moore 
Signed-off-by: Helge Deller

lib/fonts: Create font_data_t from struct console_font with font_data_import()

2026-03-09T14:47:21+00:00

Add font_data_import() and update consoles to use it.

The implementation of font_data_import() is based on code from fbcon,
which supports overflow checks and crc32 checksums. Fbcon uses the crc32
checksum.

Newport_con now implements the same overflow checks as fbcon. As before,
this console does not support checksums, which are optional. Newport_con
can now also handle input font data with a vertical pitch other than 32
bytes. (The vertical pitch is the offset between two glyphs in the font
data.)

As an internal change, remove the const qualifier from the data field
if struct font_data. This allows font_data_import() to write the data
without type casting. For all users of the font data via font_data_t,
the stored data is still read only.

v3:
- fix typos

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller

lib/fonts: Compare font data for equality with font_data_is_equal()

2026-03-09T14:47:21+00:00

Add font_data_is_equal() and update consoles to use it.

Font data is equal if it has the same size and contains the same values
on all bytes. Only fbcon uses a crc32 checksum. If set in both operands
the checksums have to be equal.

The new helper also guarantees to not compare internal fonts against
fonts from user space. Internal fonts cannot be ref-counted, so making
them equal to user-space fonts with the same byte sequence results in
undefined behavior.

The test only compares data buffers. Their interpretation is up each
console. Therefore remove a width test in fbcon_set_font().

v3:
- rebase onto font_data_{get,put}()

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller

lib/fonts: Manage font-data lifetime with font_data_get/_put()

2026-03-09T14:47:21+00:00

Add font_data_get() and font_data_put(). Update consoles to use them
over REFCOUNT() and plain kfree().

Newly allocated font data starts with a reference count of 1. Loading
the font puts the previously loaded font. If the reference count reaches
zero, font_data_put() frees the font data.

The kernel stores a refcount of zero for internal font data. Invoking
font_data_get() and font_data_put() tests this internally and returns
success without further operation. From the caller's perspective,
getting and putting works the same for all font data.

Fbcon used the userfont flag distinguish between internal fonts and
fonts loaded by user space. Only the latter where refcounted. With the
new helper's automatic handling of internal font data, remove the
userfont flag from fbcon.

Newport_con uses a default font, FONT_DATA, until user space loads
custom font data. Remove all special cases for FONT_DATA, as the get
and put calls' read-only handling also covers this case.

v3:
- fix module linker error wrt font symbols (Nathan, Arnd)
- fix typos

Signed-off-by: Thomas Zimmermann 
Signed-off-by: Helge Deller