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drivers: display: add inversion support for ili9xxx displays

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Add a new display-inversion property to ili9xxx based display drivers to
send a "Display Inversion ON (0x21)" command during initialization.

This seems to be required for some ILI9xxx based displays to work
correctly, such as BuyDisplay ER-TFT028A2-4 (ILI9341 basd IPS display).

Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
This commit is contained in:
Fabio Baltieri 2021-01-03 20:22:41 +00:00 • committed by Carles Cufí
commit 3cc5ae6405
3 changed files with 16 additions and 0 deletions
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8
drivers/display/display_ili9xxx.c
View file

@ -343,6 +343,13 @@ static int ili9xxx_configure(const struct device *dev)
return r;
}
if (config->inversion) {
r = ili9xxx_transmit(dev, ILI9XXX_DINVON, NULL, 0U);
if (r < 0) {
return r;
}
}
r = config->regs_init_fn(dev);
if (r < 0) {
return r;
@ -471,6 +478,7 @@ static const struct display_driver_api ili9xxx_api = {
.rotation = DT_PROP(INST_DT_ILI9XXX(n, t), rotation), \
.x_resolution = ILI##t##_X_RES, \
.y_resolution = ILI##t##_Y_RES, \
.inversion = DT_PROP(INST_DT_ILI9XXX(n, t), display_inversion),\
.regs = &ili9xxx_regs_##n, \
.regs_init_fn = ili##t##_regs_init, \
}; \

2
drivers/display/display_ili9xxx.h
View file

@ -13,6 +13,7 @@
/* Commands/registers. */
#define ILI9XXX_SLPOUT 0x11
#define ILI9XXX_DINVON 0x21
#define ILI9XXX_GAMSET 0x26
#define ILI9XXX_DISPOFF 0x28
#define ILI9XXX_DISPON 0x29
@ -67,6 +68,7 @@ struct ili9xxx_config {
uint16_t rotation;
uint16_t x_resolution;
uint16_t y_resolution;
bool inversion;
const void *regs;
int (*regs_init_fn)(const struct device *dev);
};

6
dts/bindings/display/ilitek,ili9xxx-common.yaml
View file

@ -46,3 +46,9 @@ properties:
- 270
description:
Display rotation (CW) in degrees.
display-inversion:
type: boolean
description:
Display inversion mode. Every bit is inverted from the frame memory to
the display.