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drivers: display: st7735r: Add rgb-is-inverted property

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Set the inverted value of pixel format setting in MADCTL register to
current_pixel_format in display capabilities structure
if rgb-is-inverted enabled.

This make enables support for a module that mismatches the RGB setting
in the MADCTL register and the actual display color format.
(Such as Longan Nano built-in LCD module.)

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
This commit is contained in:
TOKITA Hiroshi 2022-04-13 12:27:12 +09:00 • committed by Carles Cufí
commit 9f12f2cd51
1 changed files with 12 additions and 1 deletions
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13
drivers/display/display_st7735r.c
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@ -51,6 +51,7 @@ struct st7735r_config {
uint8_t gamctrp1[16];
uint8_t gamctrn1[16];
bool inversion_on;
bool rgb_is_inverted;
};
struct st7735r_data {
@ -269,7 +270,16 @@ static void st7735r_get_capabilities(const struct device *dev,
memset(capabilities, 0, sizeof(struct display_capabilities));
capabilities->x_resolution = config->width;
capabilities->y_resolution = config->height;
if (config->madctl & ST7735R_MADCTL_BGR) {
/*
* Invert the pixel format if rgb_is_inverted is enabled.
* Report pixel format as the same format set in the MADCTL
* if disabling the rgb_is_inverted option.
* Or not so, reporting pixel format as RGB if MADCTL setting
* is BGR. And also vice versa.
* It is a workaround for supporting buggy modules that display RGB as BGR.
*/
if (!(config->madctl & ST7735R_MADCTL_BGR) != !config->rgb_is_inverted) {
capabilities->supported_pixel_formats = PIXEL_FORMAT_BGR_565;
capabilities->current_pixel_format = PIXEL_FORMAT_BGR_565;
} else {
@ -551,6 +561,7 @@ static const struct display_driver_api st7735r_api = {
.gamctrp1 = DT_INST_PROP(inst, gamctrp1), \
.gamctrn1 = DT_INST_PROP(inst, gamctrn1), \
.inversion_on = DT_INST_PROP(inst, inversion_on), \
.rgb_is_inverted = DT_INST_PROP(inst, rgb_is_inverted), \
}; \
\
static struct st7735r_data st7735r_data_ ## inst = { \