linux-kernel - [PATCH] staging: fbtft: add invert display parameter

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Message-Id: <20250528-ili9341-invert-dtb-v1-1-080202809332@openpixelsystems.org>
Date: Wed, 28 May 2025 17:42:30 +0200
From: Bram Vlerick <bram.vlerick@...npixelsystems.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org, 
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Bram Vlerick <bram.vlerick@...npixelsystems.org>
Subject: [PATCH] staging: fbtft: add invert display parameter

Add devicetree parameter to enable or disable the invert feature of the
ili9341 display

Signed-off-by: Bram Vlerick <bram.vlerick@...npixelsystems.org>
---
 drivers/staging/fbtft/fb_ili9341.c | 3 +++
 drivers/staging/fbtft/fbtft-core.c | 2 ++
 drivers/staging/fbtft/fbtft.h      | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/drivers/staging/fbtft/fb_ili9341.c b/drivers/staging/fbtft/fb_ili9341.c
index 47e72b87d76d996111aaadcf5e56dfdfc1c331ab..a184f57df12b5ad6612a2e83b664a8911c7c79be 100644
--- a/drivers/staging/fbtft/fb_ili9341.c
+++ b/drivers/staging/fbtft/fb_ili9341.c
@@ -103,6 +103,9 @@ static int set_var(struct fbtft_par *par)
 		break;
 	}
 
+	if (par->invert)
+		write_reg(par, 0x21);
+
 	return 0;
 }
 
diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index da9c64152a606dc4a176f5a37fa59f6a7d3a2af3..4e827e9899e32313f2e4a9bf12ff49283a63fed3 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -641,6 +641,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 	par->buf = buf;
 	spin_lock_init(&par->dirty_lock);
 	par->bgr = pdata->bgr;
+	par->invert = pdata->invert;
 	par->startbyte = pdata->startbyte;
 	par->init_sequence = init_sequence;
 	par->gamma.curves = gamma_curves;
@@ -1107,6 +1108,7 @@ static struct fbtft_platform_data *fbtft_properties_read(struct device *dev)
 	pdata->display.bpp = fbtft_property_value(dev, "bpp");
 	pdata->display.debug = fbtft_property_value(dev, "debug");
 	pdata->rotate = fbtft_property_value(dev, "rotate");
+	pdata->invert = device_property_read_bool(dev, "invert");
 	pdata->bgr = device_property_read_bool(dev, "bgr");
 	pdata->fps = fbtft_property_value(dev, "fps");
 	pdata->txbuflen = fbtft_property_value(dev, "txbuflen");
diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
index 317be17b95c1672404fc6aecda24d0a1f563685d..71c9c35e7548de314088ac3aeb160d6c6aaf75c9 100644
--- a/drivers/staging/fbtft/fbtft.h
+++ b/drivers/staging/fbtft/fbtft.h
@@ -125,6 +125,7 @@ struct fbtft_display {
  * @display: Display properties
  * @gpios: Pointer to an array of pinname to gpio mappings
  * @rotate: Display rotation angle
+ * @invert: Invert display colors
  * @bgr: LCD Controller BGR bit
  * @fps: Frames per second (this will go away, use @fps in @fbtft_display)
  * @txbuflen: Size of transmit buffer
@@ -135,6 +136,7 @@ struct fbtft_display {
 struct fbtft_platform_data {
 	struct fbtft_display display;
 	unsigned int rotate;
+	bool invert;
 	bool bgr;
 	unsigned int fps;
 	int txbuflen;
@@ -229,6 +231,7 @@ struct fbtft_par {
 	bool first_update_done;
 	ktime_t update_time;
 	bool bgr;
+	bool invert;
 	void *extra;
 	bool polarity;
 };

---
base-commit: 914873bc7df913db988284876c16257e6ab772c6
change-id: 20250528-ili9341-invert-dtb-07a5656e6dfd

Best regards,
-- 
Bram Vlerick <bram.vlerick@...npixelsystems.org>