staging: fbtft: fb_st7789v: Initialize the Display

Set Gamma Values and Register Values for the HSD20_IPS Panel

Signed-off-by: Oliver Graute <oliver.graute@kococonnector.com>
Link: https://lore.kernel.org/r/1589380299-21871-1-git-send-email-oliver.graute@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
index 3c3f387..ebc17e0 100644 (file)
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -20,6 +20,12 @@
        "70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25\n" \
        "70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25"
 
+#define HSD20_IPS_GAMMA \
+       "D0 05 0A 09 08 05 2E 44 45 0F 17 16 2B 33\n" \
+       "D0 05 0A 09 08 05 2E 43 45 0F 16 16 2B 33"
+
+#define HSD20_IPS "true"
+
 /**
  * enum st7789v_command - ST7789V display controller commands
  *
@@ -82,14 +88,20 @@ static int init_display(struct fbtft_par *par)
 
        /* set pixel format to RGB-565 */
        write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
+       if (HSD20_IPS)
+               write_reg(par, PORCTRL, 0x05, 0x05, 0x00, 0x33, 0x33);
 
-       write_reg(par, PORCTRL, 0x08, 0x08, 0x00, 0x22, 0x22);
+       else
+               write_reg(par, PORCTRL, 0x08, 0x08, 0x00, 0x22, 0x22);
 
        /*
         * VGH = 13.26V
         * VGL = -10.43V
         */
-       write_reg(par, GCTRL, 0x35);
+       if (HSD20_IPS)
+               write_reg(par, GCTRL, 0x75);
+       else
+               write_reg(par, GCTRL, 0x35);
 
        /*
         * VDV and VRH register values come from command write
@@ -101,13 +113,19 @@ static int init_display(struct fbtft_par *par)
         * VAP =  4.1V + (VCOM + VCOM offset + 0.5 * VDV)
         * VAN = -4.1V + (VCOM + VCOM offset + 0.5 * VDV)
         */
-       write_reg(par, VRHS, 0x0B);
+       if (HSD20_IPS)
+               write_reg(par, VRHS, 0x13);
+       else
+               write_reg(par, VRHS, 0x0B);
 
        /* VDV = 0V */
        write_reg(par, VDVS, 0x20);
 
        /* VCOM = 0.9V */
-       write_reg(par, VCOMS, 0x20);
+       if (HSD20_IPS)
+               write_reg(par, VCOMS, 0x22);
+       else
+               write_reg(par, VCOMS, 0x20);
 
        /* VCOM offset = 0V */
        write_reg(par, VCMOFSET, 0x20);
@@ -120,6 +138,10 @@ static int init_display(struct fbtft_par *par)
        write_reg(par, PWCTRL1, 0xA4, 0xA1);
 
        write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
+
+       if (HSD20_IPS)
+               write_reg(par, MIPI_DCS_ENTER_INVERT_MODE);
+
        return 0;
 }
 
@@ -234,7 +256,7 @@ static struct fbtft_display display = {
        .height = 320,
        .gamma_num = 2,
        .gamma_len = 14,
-       .gamma = DEFAULT_GAMMA,
+       .gamma = HSD20_IPS_GAMMA,
        .fbtftops = {
                .init_display = init_display,
                .set_var = set_var,