Some screen sizes using st7789v chips are different from 240x320,
and offsets need to be set to display all images properly.
Signed-off-by: purofle
---
drivers/staging/fbtft/fb_st7789v.c | 22 ++
1 file changed, 22 insertions(+)
diff --git a/drivers/staging/fbtft/fb_st7789v.c
b/drivers/staging/fbtft/fb_st7789v.c
index 861a15414..d47ab4262 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -30,6 +30,12 @@
#define HSD20_IPS 1
+#define WIDTH 240
+#define HEIGHT 320
+
+#define LEFT_OFFSET 0
+#define TOP_OFFSET 0
+
/**
* enum st7789v_command - ST7789V display controller commands
*
@@ -349,6 +355,21 @@ static int set_gamma(struct fbtft_par *par, u32 *curves)
return 0;
}
+static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
+{
+ unsigned int x = xs + TOP_OFFSET, y = xe + TOP_OFFSET;
+
+ write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, (x >> 8) & 0xFF, xs & 0xFF,
+ (y >> 8) & 0xFF, xe & 0xFF);
+
+ x = ys + LEFT_OFFSET, y = ye + LEFT_OFFSET;
+
+ write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, (x >> 8) & 0xFF, ys & 0xFF,
+ (y >> 8) & 0xFF, ye & 0xFF);
+
+ write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
+}
+
/**
* blank() - blank the display
*
@@ -379,6 +400,7 @@ static struct fbtft_display display = {
.set_var = set_var,
.set_gamma = set_gamma,
.blank = blank,
+ .set_addr_win = set_addr_win,
},
};
--
2.44.0
