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drm/st7571-i2c: add support for inverted pixel format

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[ Upstream commit e61c35157d ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marcus Folkesson
2025-07-21 12:43:34 +02:00
committed by Greg Kroah-Hartman
parent 7685a76fa1
commit 1a72b11e88
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/sitronix/st7571-i2c.c
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@@ -151,6 +151,7 @@ struct st7571_device {
bool ignore_nak;
bool grayscale;
bool inverted;
u32 height_mm;
u32 width_mm;
u32 startline;
@@ -792,6 +793,7 @@ static int st7567_parse_dt(struct st7571_device *st7567)
of_property_read_u32(np, "width-mm", &st7567->width_mm);
of_property_read_u32(np, "height-mm", &st7567->height_mm);
st7567->inverted = of_property_read_bool(np, "sitronix,inverted");
st7567->pformat = &st7571_monochrome;
st7567->bpp = 1;
@@ -819,6 +821,7 @@ static int st7571_parse_dt(struct st7571_device *st7571)
of_property_read_u32(np, "width-mm", &st7571->width_mm);
of_property_read_u32(np, "height-mm", &st7571->height_mm);
st7571->grayscale = of_property_read_bool(np, "sitronix,grayscale");
st7571->inverted = of_property_read_bool(np, "sitronix,inverted");
if (st7571->grayscale) {
st7571->pformat = &st7571_grayscale;
@@ -873,7 +876,7 @@ static int st7567_lcd_init(struct st7571_device *st7567)
ST7571_SET_POWER(0x6), /* Power Control, VC: ON, VR: ON, VF: OFF */
ST7571_SET_POWER(0x7), /* Power Control, VC: ON, VR: ON, VF: ON */
ST7571_SET_REVERSE(0),
ST7571_SET_REVERSE(st7567->inverted ? 1 : 0),
ST7571_SET_ENTIRE_DISPLAY_ON(0),
};
@@ -917,7 +920,7 @@ static int st7571_lcd_init(struct st7571_device *st7571)
ST7571_SET_COLOR_MODE(st7571->pformat->mode),
ST7571_COMMAND_SET_NORMAL,
ST7571_SET_REVERSE(0),
ST7571_SET_REVERSE(st7571->inverted ? 1 : 0),
ST7571_SET_ENTIRE_DISPLAY_ON(0),
};