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11 Commits

Author SHA1 Message Date
Marcus Folkesson
7e73cefd2b drm/sitronix/st7571-i2c: remove unneeded semicolon 
Fix style issue reported by Kernel test robot.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202510221125.Cg0sM4xJ-lkp@intel.com/
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://lore.kernel.org/r/20251022-st7571-semicolon-v1-1-83d322618ff4@gmail.com
 2025-10-22 09:56:52 +02:00
Marcus Folkesson
eb0ed2ad33 drm/sitronix/st7571-i2c: reset position before clearing display 
We cannot know where the write pointer is, always reset position to
(0,0) before clearing display.

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250913-st7571-reset-v1-1-ae5f58acdf8d@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-10-03 12:01:50 +02:00
Marcus Folkesson
100d457c0f drm/st7571-i2c: add support for 2bit grayscale for XRGB8888 
Add support for 2bit grayscale and use it for XRGB8888 when grayscale is
supported.

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-v2-6-159f4134098c@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-09-01 15:35:29 +02:00
Marcus Folkesson
e61c35157d drm/st7571-i2c: add support for inverted pixel format 
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>
 2025-09-01 15:26:44 +02:00
Marcus Folkesson
c4baa2d987 drm/st7571-i2c: correct pixel data format description 
The comment describes the pixel data format as stated in
the st7571 datasheet, which is not necessary the same
as for the connected display.

Instead, describe the expected pixel data format which is used for
R1/R2/XRGB8888.

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-v2-1-159f4134098c@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-09-01 15:26:43 +02:00
Javier Martinez Canillas
1c936e8592 drm/sitronix/st7571-i2c: Make st7571_panel_data variables static const 
The kernel test robot reported that sparse gives the following warnings:

make C=2 M=drivers/gpu/drm/sitronix/
  CC [M]  st7571-i2c.o
  CHECK   st7571-i2c.c
st7571-i2c.c:1027:26: warning: symbol 'st7567_config' was not declared. Should it be static?
st7571-i2c.c:1039:26: warning: symbol 'st7571_config' was not declared. Should it be static?
  MODPOST Module.symvers
  LD [M]  st7571-i2c.ko

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202507180503.nfyD9uRv-lkp@intel.com
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250718152534.729770-1-javierm@redhat.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-09-01 11:27:31 +02:00
Javier Martinez Canillas
a55863ba4c drm/sitronix/st7571-i2c: Add support for the ST7567 Controller 
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>
 2025-07-16 12:12:39 +02:00
Javier Martinez Canillas
d9ace6d550 drm/sitronix/st7571-i2c: Add an indirection level to parse DT 
Other Sitronix display controllers might need a different parsing DT
logic, so lets add a .parse_dt callback to struct st7571_panel_data.

Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://lore.kernel.org/r/20250715110411.448343-4-javierm@redhat.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-07-16 12:12:38 +02:00
Javier Martinez Canillas
720799d946 drm/sitronix/st7571-i2c: Log probe deferral cause for GPIO get failure 
The driver already uses the dev_err_probe() helper (that only prints error
messages for the -EPROBE_DEFER case) when fails to get any other resource.

Also do the same when it fails to obtain the reset GPIO.

Reviewed-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://lore.kernel.org/r/20250715110411.448343-3-javierm@redhat.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-07-16 12:12:38 +02:00
Javier Martinez Canillas
1d043d6c00 drm/sitronix/st7571-i2c: Fix encoder callbacks function names 
It seems the driver took some inspiration from ssd130x and some of the
functions (encoder callbacks) were not renamed to use a st7571_ prefix.

Reviewed-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://lore.kernel.org/r/20250715110411.448343-2-javierm@redhat.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-07-16 12:12:38 +02:00
Marcus Folkesson
9b8f32002c drm/sitronix: move tiny Sitronix drivers to their own subdir 
We start to have support many Sitronix displays in the tiny directory,
and we expect more to come.

Move them to their own subdirectory.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Suggested-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250512-sitronix-v3-1-bbf6cc413698@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
 2025-05-12 10:26:40 +02:00