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