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drm/st7571-i2c: correct pixel data format description

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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>
This commit is contained in:
Marcus Folkesson
2025-07-21 12:43:31 +02:00
committed by Javier Martinez Canillas
parent 6b53cf48d9
commit c4baa2d987
1 changed files with 4 additions and 4 deletions
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8
drivers/gpu/drm/sitronix/st7571-i2c.c
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@@ -386,10 +386,10 @@ static int st7571_fb_update_rect_grayscale(struct drm_framebuffer *fb, struct dr
* even if the format is monochrome.
*
* The bit values maps to the following grayscale:
* 0 0 = White
* 0 1 = Light gray
* 1 0 = Dark gray
* 1 1 = Black
* 0 0 = Black
* 0 1 = Dark gray
* 1 0 = Light gray
* 1 1 = White
*
* For monochrome formats, write the same value twice to get
* either a black or white pixel.