From 06c9c2dbe5671e5d8f783b8fdee675acc1e60628 Mon Sep 17 00:00:00 2001
From: Maxim Medvedev <redrathnure@gmail.com>
Date: Fri, 29 Nov 2024 19:46:48 +0100
Subject: [PATCH] feat: add ST7796 kernel module (fbtft)

Add support for ST7796 based LCD module (connected via SPI interface). One of real device example is [MKS PI-TS35 display](https://github.com/makerbase-mks/MKS-TFT-Hardware/tree/master/MKS%20PI-TS35).
---
 config/kernel/linux-rockchip64-current.config |   1 +
 config/kernel/linux-rockchip64-edge.config    |   1 +
 .../general-st7796-driver.patch               | 196 ++++++++++++++++++
 .../general-st7796-driver.patch               | 196 ++++++++++++++++++
 .../general-st7796-driver.patch               | 196 ++++++++++++++++++
 5 files changed, 590 insertions(+)
 create mode 100644 patch/kernel/archive/rockchip64-6.12/general-st7796-driver.patch
 create mode 100644 patch/kernel/archive/rockchip64-6.6/general-st7796-driver.patch
 create mode 100644 patch/kernel/archive/rockchip64-6.9/general-st7796-driver.patch

diff --git a/config/kernel/linux-rockchip64-current.config b/config/kernel/linux-rockchip64-current.config
index 2e8e7e9ceb..e7db6f5d8f 100644
--- a/config/kernel/linux-rockchip64-current.config
+++ b/config/kernel/linux-rockchip64-current.config
@@ -7796,6 +7796,7 @@ CONFIG_FB_TFT_SSD1331=m
 CONFIG_FB_TFT_SSD1351=m
 CONFIG_FB_TFT_ST7735R=m
 CONFIG_FB_TFT_ST7789V=m
+CONFIG_FB_TFT_ST7796=m
 CONFIG_FB_TFT_TINYLCD=m
 CONFIG_FB_TFT_TLS8204=m
 CONFIG_FB_TFT_UC1611=m
diff --git a/config/kernel/linux-rockchip64-edge.config b/config/kernel/linux-rockchip64-edge.config
index 18a6f52280..4eaae942d5 100644
--- a/config/kernel/linux-rockchip64-edge.config
+++ b/config/kernel/linux-rockchip64-edge.config
@@ -8031,6 +8031,7 @@ CONFIG_FB_TFT_SSD1331=m
 CONFIG_FB_TFT_SSD1351=m
 CONFIG_FB_TFT_ST7735R=m
 CONFIG_FB_TFT_ST7789V=m
+CONFIG_FB_TFT_ST7796=m
 CONFIG_FB_TFT_TINYLCD=m
 CONFIG_FB_TFT_TLS8204=m
 CONFIG_FB_TFT_UC1611=m
diff --git a/patch/kernel/archive/rockchip64-6.12/general-st7796-driver.patch b/patch/kernel/archive/rockchip64-6.12/general-st7796-driver.patch
new file mode 100644
index 0000000000..e986a92255
--- /dev/null
+++ b/patch/kernel/archive/rockchip64-6.12/general-st7796-driver.patch
@@ -0,0 +1,196 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Maxim Medvedev <redrathnure@gmail.com>
+Date: Fri, 12 May 2023 22:30:14 +0000
+Subject: Custom st7796 display module
+
+---
+
+diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
+index 4d29e8c1014..265c7e3fe76 100644
+--- a/drivers/staging/fbtft/Kconfig
++++ b/drivers/staging/fbtft/Kconfig
+@@ -82,6 +82,12 @@ config FB_TFT_ILI9481
+ 	help
+ 	  Generic Framebuffer support for ILI9481
+ 
++config FB_TFT_ST7796
++	tristate "FB driver for the ST7796 LCD Controller"
++	depends on FB_TFT
++	help
++	  Generic Framebuffer support for ST7796
++
+ config FB_TFT_ILI9486
+ 	tristate "FB driver for the ILI9486 LCD Controller"
+ 	depends on FB_TFT
+diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
+index e9cdf0f0a7d..3c62b33e596 100644
+--- a/drivers/staging/fbtft/Makefile
++++ b/drivers/staging/fbtft/Makefile
+@@ -16,6 +16,7 @@ obj-$(CONFIG_FB_TFT_ILI9325)     += fb_ili9325.o
+ obj-$(CONFIG_FB_TFT_ILI9340)     += fb_ili9340.o
+ obj-$(CONFIG_FB_TFT_ILI9341)     += fb_ili9341.o
+ obj-$(CONFIG_FB_TFT_ILI9481)     += fb_ili9481.o
++obj-$(CONFIG_FB_TFT_ST7796)      += fb_st7796.o
+ obj-$(CONFIG_FB_TFT_ILI9486)     += fb_ili9486.o
+ obj-$(CONFIG_FB_TFT_PCD8544)     += fb_pcd8544.o
+ obj-$(CONFIG_FB_TFT_RA8875)      += fb_ra8875.o
+diff --git a/drivers/staging/fbtft/fb_st7796.c b/drivers/staging/fbtft/fb_st7796.c
+new file mode 100755
+index 00000000000..c7deedbea69
+--- /dev/null
++++ b/drivers/staging/fbtft/fb_st7796.c
+@@ -0,0 +1,160 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * FB driver for the ST7796 LCD display controller
++ *
++ * Based on ILI9486 from Christian Vogelgsang and adafruit22fb.c by Noralf Tronnes.
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/delay.h>
++#include <video/mipi_display.h>
++
++#include "fbtft.h"
++
++// Patch from MKS - start
++
++#define DRVNAME		"fb_st7796"
++#define WIDTH		320
++#define HEIGHT		480	
++#define TXBUFLEN	0xfffe // (4 * PAGE_SIZE)
++
++ // Patch from MKS - end
++
++#define DEFAULT_GAMMA	"1F 1A 18 0A 0F 06 45 87 32 0A 07 02 07 05 00\n" \
++			"00 25 27 05 10 09 3A 78 4D 05 18 0D 38 3A 1F"
++
++static int init_display(struct fbtft_par *par)
++{
++	par->fbtftops.reset(par);
++
++	/* startup sequence for MI0283QT-9A */
++	write_reg(par, MIPI_DCS_SOFT_RESET);
++	mdelay(5);
++	write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
++	
++	// Patch from MKS - start	
++	
++	/*these are for st7796*/
++	/* --------------------------------------------------------- */
++	write_reg(par, 0xf0, 0xc3);
++	write_reg(par, 0xf0, 0x96);
++	write_reg(par, 0x36, 0x28);
++	write_reg(par, 0x3A, 0x55);
++	write_reg(par, 0xB4, 0x01);
++	write_reg(par, 0xB7, 0xc6);
++	write_reg(par, 0xE8, 0x40, 0x8a, 0x00, 0x00, 0x29, 0x19, 0xa5, 0x33);
++	write_reg(par, 0xc1, 0x06);
++	write_reg(par, 0xc2, 0xa7);
++	write_reg(par, 0xc5, 0x18);
++	write_reg(par, 0xE0, 0xf0, 0x09, 0x0b, 0x06, 0x04, 0x15, 0x2f, 0x54, 0x42, 0x3c, 0x17, 0x14, 0x18, 0x1b);
++	write_reg(par, 0xE1, 0xf0, 0x09, 0x0b, 0x06, 0x04, 0x03, 0x2d, 0x43, 0x42, 0x3b, 0x16, 0x14, 0x17, 0x1b);
++	write_reg(par, 0xf0, 0x3c);
++	write_reg(par, 0xf0, 0x69);
++	write_reg(par, 0x11);
++	mdelay(100);
++	write_reg(par, 0x29);
++	mdelay(20);
++
++	// Patch from MKS - end
++
++	return 0;
++}
++
++static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
++{
++	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
++		  (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
++
++	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
++		  (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
++
++	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
++}
++
++#define MEM_Y   BIT(7) /* MY row address order */
++#define MEM_X   BIT(6) /* MX column address order */
++#define MEM_V   BIT(5) /* MV row / column exchange */
++#define MEM_L   BIT(4) /* ML vertical refresh order */
++#define MEM_H   BIT(2) /* MH horizontal refresh order */
++#define MEM_BGR (3) /* RGB-BGR Order */
++static int set_var(struct fbtft_par *par)
++{
++	switch (par->info->var.rotate) {
++	case 0:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_X | (par->bgr << MEM_BGR));
++		break;
++	case 270:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_V | MEM_L | (par->bgr << MEM_BGR));
++		break;
++	case 180:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_Y | (par->bgr << MEM_BGR));
++		break;
++	case 90:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_Y | MEM_X | MEM_V | (par->bgr << MEM_BGR));
++		break;
++	}
++
++	return 0;
++}
++
++/*
++ * Gamma string format:
++ *  Positive: Par1 Par2 [...] Par15
++ *  Negative: Par1 Par2 [...] Par15
++ */
++#define CURVE(num, idx)  curves[(num) * par->gamma.num_values + (idx)]
++static int set_gamma(struct fbtft_par *par, u32 *curves)
++{
++	int i;
++
++	for (i = 0; i < par->gamma.num_curves; i++)
++		write_reg(par, 0xE0 + i,
++			  CURVE(i, 0), CURVE(i, 1), CURVE(i, 2),
++			  CURVE(i, 3), CURVE(i, 4), CURVE(i, 5),
++			  CURVE(i, 6), CURVE(i, 7), CURVE(i, 8),
++			  CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
++			  CURVE(i, 12), CURVE(i, 13), CURVE(i, 14));
++
++	return 0;
++}
++
++#undef CURVE
++
++static struct fbtft_display display = {
++	.regwidth = 8,
++	.width = WIDTH,
++	.height = HEIGHT,
++	.txbuflen = TXBUFLEN,
++	.gamma_num = 2,
++	.gamma_len = 15,
++	.gamma = DEFAULT_GAMMA,
++	.fbtftops = {
++		.init_display = init_display,
++		.set_addr_win = set_addr_win,
++		.set_var = set_var,
++		.set_gamma = set_gamma,
++	},
++};
++
++FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,st7796", &display);
++
++MODULE_ALIAS("spi:" DRVNAME);
++MODULE_ALIAS("platform:" DRVNAME);
++MODULE_ALIAS("spi:st7796");
++MODULE_ALIAS("platform:st7796");
++
++MODULE_DESCRIPTION("FB driver for the ST7796 LCD display controller");
++MODULE_AUTHOR("Christian Vogelgsang + somebody from makerbase");
++MODULE_LICENSE("GPL");
diff --git a/patch/kernel/archive/rockchip64-6.6/general-st7796-driver.patch b/patch/kernel/archive/rockchip64-6.6/general-st7796-driver.patch
new file mode 100644
index 0000000000..e986a92255
--- /dev/null
+++ b/patch/kernel/archive/rockchip64-6.6/general-st7796-driver.patch
@@ -0,0 +1,196 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Maxim Medvedev <redrathnure@gmail.com>
+Date: Fri, 12 May 2023 22:30:14 +0000
+Subject: Custom st7796 display module
+
+---
+
+diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
+index 4d29e8c1014..265c7e3fe76 100644
+--- a/drivers/staging/fbtft/Kconfig
++++ b/drivers/staging/fbtft/Kconfig
+@@ -82,6 +82,12 @@ config FB_TFT_ILI9481
+ 	help
+ 	  Generic Framebuffer support for ILI9481
+ 
++config FB_TFT_ST7796
++	tristate "FB driver for the ST7796 LCD Controller"
++	depends on FB_TFT
++	help
++	  Generic Framebuffer support for ST7796
++
+ config FB_TFT_ILI9486
+ 	tristate "FB driver for the ILI9486 LCD Controller"
+ 	depends on FB_TFT
+diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
+index e9cdf0f0a7d..3c62b33e596 100644
+--- a/drivers/staging/fbtft/Makefile
++++ b/drivers/staging/fbtft/Makefile
+@@ -16,6 +16,7 @@ obj-$(CONFIG_FB_TFT_ILI9325)     += fb_ili9325.o
+ obj-$(CONFIG_FB_TFT_ILI9340)     += fb_ili9340.o
+ obj-$(CONFIG_FB_TFT_ILI9341)     += fb_ili9341.o
+ obj-$(CONFIG_FB_TFT_ILI9481)     += fb_ili9481.o
++obj-$(CONFIG_FB_TFT_ST7796)      += fb_st7796.o
+ obj-$(CONFIG_FB_TFT_ILI9486)     += fb_ili9486.o
+ obj-$(CONFIG_FB_TFT_PCD8544)     += fb_pcd8544.o
+ obj-$(CONFIG_FB_TFT_RA8875)      += fb_ra8875.o
+diff --git a/drivers/staging/fbtft/fb_st7796.c b/drivers/staging/fbtft/fb_st7796.c
+new file mode 100755
+index 00000000000..c7deedbea69
+--- /dev/null
++++ b/drivers/staging/fbtft/fb_st7796.c
+@@ -0,0 +1,160 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * FB driver for the ST7796 LCD display controller
++ *
++ * Based on ILI9486 from Christian Vogelgsang and adafruit22fb.c by Noralf Tronnes.
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/delay.h>
++#include <video/mipi_display.h>
++
++#include "fbtft.h"
++
++// Patch from MKS - start
++
++#define DRVNAME		"fb_st7796"
++#define WIDTH		320
++#define HEIGHT		480	
++#define TXBUFLEN	0xfffe // (4 * PAGE_SIZE)
++
++ // Patch from MKS - end
++
++#define DEFAULT_GAMMA	"1F 1A 18 0A 0F 06 45 87 32 0A 07 02 07 05 00\n" \
++			"00 25 27 05 10 09 3A 78 4D 05 18 0D 38 3A 1F"
++
++static int init_display(struct fbtft_par *par)
++{
++	par->fbtftops.reset(par);
++
++	/* startup sequence for MI0283QT-9A */
++	write_reg(par, MIPI_DCS_SOFT_RESET);
++	mdelay(5);
++	write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
++	
++	// Patch from MKS - start	
++	
++	/*these are for st7796*/
++	/* --------------------------------------------------------- */
++	write_reg(par, 0xf0, 0xc3);
++	write_reg(par, 0xf0, 0x96);
++	write_reg(par, 0x36, 0x28);
++	write_reg(par, 0x3A, 0x55);
++	write_reg(par, 0xB4, 0x01);
++	write_reg(par, 0xB7, 0xc6);
++	write_reg(par, 0xE8, 0x40, 0x8a, 0x00, 0x00, 0x29, 0x19, 0xa5, 0x33);
++	write_reg(par, 0xc1, 0x06);
++	write_reg(par, 0xc2, 0xa7);
++	write_reg(par, 0xc5, 0x18);
++	write_reg(par, 0xE0, 0xf0, 0x09, 0x0b, 0x06, 0x04, 0x15, 0x2f, 0x54, 0x42, 0x3c, 0x17, 0x14, 0x18, 0x1b);
++	write_reg(par, 0xE1, 0xf0, 0x09, 0x0b, 0x06, 0x04, 0x03, 0x2d, 0x43, 0x42, 0x3b, 0x16, 0x14, 0x17, 0x1b);
++	write_reg(par, 0xf0, 0x3c);
++	write_reg(par, 0xf0, 0x69);
++	write_reg(par, 0x11);
++	mdelay(100);
++	write_reg(par, 0x29);
++	mdelay(20);
++
++	// Patch from MKS - end
++
++	return 0;
++}
++
++static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
++{
++	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
++		  (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
++
++	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
++		  (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
++
++	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
++}
++
++#define MEM_Y   BIT(7) /* MY row address order */
++#define MEM_X   BIT(6) /* MX column address order */
++#define MEM_V   BIT(5) /* MV row / column exchange */
++#define MEM_L   BIT(4) /* ML vertical refresh order */
++#define MEM_H   BIT(2) /* MH horizontal refresh order */
++#define MEM_BGR (3) /* RGB-BGR Order */
++static int set_var(struct fbtft_par *par)
++{
++	switch (par->info->var.rotate) {
++	case 0:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_X | (par->bgr << MEM_BGR));
++		break;
++	case 270:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_V | MEM_L | (par->bgr << MEM_BGR));
++		break;
++	case 180:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_Y | (par->bgr << MEM_BGR));
++		break;
++	case 90:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_Y | MEM_X | MEM_V | (par->bgr << MEM_BGR));
++		break;
++	}
++
++	return 0;
++}
++
++/*
++ * Gamma string format:
++ *  Positive: Par1 Par2 [...] Par15
++ *  Negative: Par1 Par2 [...] Par15
++ */
++#define CURVE(num, idx)  curves[(num) * par->gamma.num_values + (idx)]
++static int set_gamma(struct fbtft_par *par, u32 *curves)
++{
++	int i;
++
++	for (i = 0; i < par->gamma.num_curves; i++)
++		write_reg(par, 0xE0 + i,
++			  CURVE(i, 0), CURVE(i, 1), CURVE(i, 2),
++			  CURVE(i, 3), CURVE(i, 4), CURVE(i, 5),
++			  CURVE(i, 6), CURVE(i, 7), CURVE(i, 8),
++			  CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
++			  CURVE(i, 12), CURVE(i, 13), CURVE(i, 14));
++
++	return 0;
++}
++
++#undef CURVE
++
++static struct fbtft_display display = {
++	.regwidth = 8,
++	.width = WIDTH,
++	.height = HEIGHT,
++	.txbuflen = TXBUFLEN,
++	.gamma_num = 2,
++	.gamma_len = 15,
++	.gamma = DEFAULT_GAMMA,
++	.fbtftops = {
++		.init_display = init_display,
++		.set_addr_win = set_addr_win,
++		.set_var = set_var,
++		.set_gamma = set_gamma,
++	},
++};
++
++FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,st7796", &display);
++
++MODULE_ALIAS("spi:" DRVNAME);
++MODULE_ALIAS("platform:" DRVNAME);
++MODULE_ALIAS("spi:st7796");
++MODULE_ALIAS("platform:st7796");
++
++MODULE_DESCRIPTION("FB driver for the ST7796 LCD display controller");
++MODULE_AUTHOR("Christian Vogelgsang + somebody from makerbase");
++MODULE_LICENSE("GPL");
diff --git a/patch/kernel/archive/rockchip64-6.9/general-st7796-driver.patch b/patch/kernel/archive/rockchip64-6.9/general-st7796-driver.patch
new file mode 100644
index 0000000000..e986a92255
--- /dev/null
+++ b/patch/kernel/archive/rockchip64-6.9/general-st7796-driver.patch
@@ -0,0 +1,196 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Maxim Medvedev <redrathnure@gmail.com>
+Date: Fri, 12 May 2023 22:30:14 +0000
+Subject: Custom st7796 display module
+
+---
+
+diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
+index 4d29e8c1014..265c7e3fe76 100644
+--- a/drivers/staging/fbtft/Kconfig
++++ b/drivers/staging/fbtft/Kconfig
+@@ -82,6 +82,12 @@ config FB_TFT_ILI9481
+ 	help
+ 	  Generic Framebuffer support for ILI9481
+ 
++config FB_TFT_ST7796
++	tristate "FB driver for the ST7796 LCD Controller"
++	depends on FB_TFT
++	help
++	  Generic Framebuffer support for ST7796
++
+ config FB_TFT_ILI9486
+ 	tristate "FB driver for the ILI9486 LCD Controller"
+ 	depends on FB_TFT
+diff --git a/drivers/staging/fbtft/Makefile b/drivers/staging/fbtft/Makefile
+index e9cdf0f0a7d..3c62b33e596 100644
+--- a/drivers/staging/fbtft/Makefile
++++ b/drivers/staging/fbtft/Makefile
+@@ -16,6 +16,7 @@ obj-$(CONFIG_FB_TFT_ILI9325)     += fb_ili9325.o
+ obj-$(CONFIG_FB_TFT_ILI9340)     += fb_ili9340.o
+ obj-$(CONFIG_FB_TFT_ILI9341)     += fb_ili9341.o
+ obj-$(CONFIG_FB_TFT_ILI9481)     += fb_ili9481.o
++obj-$(CONFIG_FB_TFT_ST7796)      += fb_st7796.o
+ obj-$(CONFIG_FB_TFT_ILI9486)     += fb_ili9486.o
+ obj-$(CONFIG_FB_TFT_PCD8544)     += fb_pcd8544.o
+ obj-$(CONFIG_FB_TFT_RA8875)      += fb_ra8875.o
+diff --git a/drivers/staging/fbtft/fb_st7796.c b/drivers/staging/fbtft/fb_st7796.c
+new file mode 100755
+index 00000000000..c7deedbea69
+--- /dev/null
++++ b/drivers/staging/fbtft/fb_st7796.c
+@@ -0,0 +1,160 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * FB driver for the ST7796 LCD display controller
++ *
++ * Based on ILI9486 from Christian Vogelgsang and adafruit22fb.c by Noralf Tronnes.
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/delay.h>
++#include <video/mipi_display.h>
++
++#include "fbtft.h"
++
++// Patch from MKS - start
++
++#define DRVNAME		"fb_st7796"
++#define WIDTH		320
++#define HEIGHT		480	
++#define TXBUFLEN	0xfffe // (4 * PAGE_SIZE)
++
++ // Patch from MKS - end
++
++#define DEFAULT_GAMMA	"1F 1A 18 0A 0F 06 45 87 32 0A 07 02 07 05 00\n" \
++			"00 25 27 05 10 09 3A 78 4D 05 18 0D 38 3A 1F"
++
++static int init_display(struct fbtft_par *par)
++{
++	par->fbtftops.reset(par);
++
++	/* startup sequence for MI0283QT-9A */
++	write_reg(par, MIPI_DCS_SOFT_RESET);
++	mdelay(5);
++	write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
++	
++	// Patch from MKS - start	
++	
++	/*these are for st7796*/
++	/* --------------------------------------------------------- */
++	write_reg(par, 0xf0, 0xc3);
++	write_reg(par, 0xf0, 0x96);
++	write_reg(par, 0x36, 0x28);
++	write_reg(par, 0x3A, 0x55);
++	write_reg(par, 0xB4, 0x01);
++	write_reg(par, 0xB7, 0xc6);
++	write_reg(par, 0xE8, 0x40, 0x8a, 0x00, 0x00, 0x29, 0x19, 0xa5, 0x33);
++	write_reg(par, 0xc1, 0x06);
++	write_reg(par, 0xc2, 0xa7);
++	write_reg(par, 0xc5, 0x18);
++	write_reg(par, 0xE0, 0xf0, 0x09, 0x0b, 0x06, 0x04, 0x15, 0x2f, 0x54, 0x42, 0x3c, 0x17, 0x14, 0x18, 0x1b);
++	write_reg(par, 0xE1, 0xf0, 0x09, 0x0b, 0x06, 0x04, 0x03, 0x2d, 0x43, 0x42, 0x3b, 0x16, 0x14, 0x17, 0x1b);
++	write_reg(par, 0xf0, 0x3c);
++	write_reg(par, 0xf0, 0x69);
++	write_reg(par, 0x11);
++	mdelay(100);
++	write_reg(par, 0x29);
++	mdelay(20);
++
++	// Patch from MKS - end
++
++	return 0;
++}
++
++static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
++{
++	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
++		  (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);
++
++	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
++		  (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);
++
++	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
++}
++
++#define MEM_Y   BIT(7) /* MY row address order */
++#define MEM_X   BIT(6) /* MX column address order */
++#define MEM_V   BIT(5) /* MV row / column exchange */
++#define MEM_L   BIT(4) /* ML vertical refresh order */
++#define MEM_H   BIT(2) /* MH horizontal refresh order */
++#define MEM_BGR (3) /* RGB-BGR Order */
++static int set_var(struct fbtft_par *par)
++{
++	switch (par->info->var.rotate) {
++	case 0:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_X | (par->bgr << MEM_BGR));
++		break;
++	case 270:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_V | MEM_L | (par->bgr << MEM_BGR));
++		break;
++	case 180:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_Y | (par->bgr << MEM_BGR));
++		break;
++	case 90:
++		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
++			  MEM_Y | MEM_X | MEM_V | (par->bgr << MEM_BGR));
++		break;
++	}
++
++	return 0;
++}
++
++/*
++ * Gamma string format:
++ *  Positive: Par1 Par2 [...] Par15
++ *  Negative: Par1 Par2 [...] Par15
++ */
++#define CURVE(num, idx)  curves[(num) * par->gamma.num_values + (idx)]
++static int set_gamma(struct fbtft_par *par, u32 *curves)
++{
++	int i;
++
++	for (i = 0; i < par->gamma.num_curves; i++)
++		write_reg(par, 0xE0 + i,
++			  CURVE(i, 0), CURVE(i, 1), CURVE(i, 2),
++			  CURVE(i, 3), CURVE(i, 4), CURVE(i, 5),
++			  CURVE(i, 6), CURVE(i, 7), CURVE(i, 8),
++			  CURVE(i, 9), CURVE(i, 10), CURVE(i, 11),
++			  CURVE(i, 12), CURVE(i, 13), CURVE(i, 14));
++
++	return 0;
++}
++
++#undef CURVE
++
++static struct fbtft_display display = {
++	.regwidth = 8,
++	.width = WIDTH,
++	.height = HEIGHT,
++	.txbuflen = TXBUFLEN,
++	.gamma_num = 2,
++	.gamma_len = 15,
++	.gamma = DEFAULT_GAMMA,
++	.fbtftops = {
++		.init_display = init_display,
++		.set_addr_win = set_addr_win,
++		.set_var = set_var,
++		.set_gamma = set_gamma,
++	},
++};
++
++FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,st7796", &display);
++
++MODULE_ALIAS("spi:" DRVNAME);
++MODULE_ALIAS("platform:" DRVNAME);
++MODULE_ALIAS("spi:st7796");
++MODULE_ALIAS("platform:st7796");
++
++MODULE_DESCRIPTION("FB driver for the ST7796 LCD display controller");
++MODULE_AUTHOR("Christian Vogelgsang + somebody from makerbase");
++MODULE_LICENSE("GPL");