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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>
This commit is contained in:
Oliver Graute 2020-05-13 16:30:46 +02:00 committed by Greg Kroah-Hartman
parent ec269f1250
commit f03c9b7884
1 changed files with 27 additions and 5 deletions
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32
drivers/staging/fbtft/fb_st7789v.c
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@ -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,