Depending on which display that is connected to the controller, an
"1" means either a black or a white pixel.
The supported formats (R1/R2/XRGB8888) expects the pixels
to map against (4bit):
00 => Black
01 => Dark Gray
10 => Light Gray
11 => White
If this is not what the display map against, make it possible to invert
the pixels.
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://lore.kernel.org/r/20250721-st7571-format-v2-4-159f4134098c@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
The Sitronix ST7567 is a monochrome Dot Matrix LCD Controller that has SPI,
I2C and parallel interfaces. The st7571-i2c driver only has support for I2C
so displays using other transport interfaces are currently not supported.
The DRM_FORMAT_R1 pixel format and data commands are the same than what
is used by the ST7571 controller, so only is needed a different callback
that implements the expected initialization sequence for the ST7567 chip.
Reviewed-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250715110411.448343-6-javierm@redhat.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
This driver requires of_get_display_timing() from
CONFIG_VIDEOMODE_HELPERS but does not select it. If no other driver
selects it, there will be a failure from the linker if the driver is
built in or modpost if it is a module.
ERROR: modpost: "of_get_display_timing" [drivers/gpu/drm/sitronix/st7571-i2c.ko] undefined!
Select CONFIG_VIDEOMODE_HELPERS to resolve the build failure.
Fixes: 4b35f0f41e ("drm/st7571-i2c: add support for Sitronix ST7571 LCD controller")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20250610-drm-st7571-i2c-select-videomode-helpers-v1-1-d30b50ff6e64@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>
When moving the Sitronix DRM drivers and renaming their Kconfig symbols,
the old symbols were kept, aiming to provide a seamless migration path
when running "make olddefconfig" or "make oldconfig".
However, the old compatibility symbols are not visible. Hence unless
they are selected by another symbol (which they are not), they can never
be enabled, and no backwards compatibility is provided.
Drop the broken mechanism and the old symbols.
Fixes: 9b8f32002c ("drm/sitronix: move tiny Sitronix drivers to their own subdir")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20395b14effe5e2e05a4f0856fdcda51c410329d.1747751592.git.geert+renesas@glider.be
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
