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Subject[PATCH v5 6/8] drm/panel: Add ilitek ili9341 panel driver
Date
From: dillon min <dillon.minfei@gmail.com>

This driver combine tiny/ili9341.c mipi_dbi_interface driver
with mipi_dpi_interface driver, can support ili9341 with serial
mode or parallel rgb interface mode by register configuration.

Changes since V3:

accoding to Linus Walleij's suggestion.
1 add more comments to driver.
2 reduce magic number usage in the driver.
3 move panel configuration from common place to system configuration.
4 reuse MIPI_DCS_* as more as possible.

Signed-off-by: dillon min <dillon.minfei@gmail.com>
---
drivers/gpu/drm/panel/Kconfig | 12 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 1301 ++++++++++++++++++++++++++
3 files changed, 1314 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index a1723c1..c938bee 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -95,6 +95,18 @@ config DRM_PANEL_ILITEK_IL9322
Say Y here if you want to enable support for Ilitek IL9322
QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.

+config DRM_PANEL_ILITEK_ILI9341
+ tristate "Ilitek ILI9341 240x320 QVGA panels"
+ depends on OF && SPI
+ depends on DRM_KMS_HELPER
+ depends on DRM_KMS_CMA_HELPER
+ depends on BACKLIGHT_CLASS_DEVICE
+ select DRM_MIPI_DBI
+ help
+ Say Y here if you want to enable support for Ilitek IL9341
+ QVGA (240x320) RGB panels. support serial & parallel rgb
+ interface.
+
config DRM_PANEL_ILITEK_ILI9881C
tristate "Ilitek ILI9881C-based panels"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 96a883c..16947d7 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) += panel-elida-kd35t133.o
obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) += panel-feixin-k101-im2ba02.o
obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) += panel-ilitek-ili9341.o
obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
new file mode 100644
index 0000000..dd6f860
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -0,0 +1,1301 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ilitek ILI9341 TFT LCD drm_panel driver.
+ *
+ * This panel can be configured to support:
+ * - 16-bit parallel RGB interface
+ * - 18-bit parallel RGB interface
+ * - 4-line serial spi interface
+ *
+ * Copyright (C) 2020 Dillon Min <dillon.minfei@gmail.com>
+ * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c
+ */
+
+#include <linux/bitops.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/delay.h>
+#include <video/mipi_display.h>
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_atomic_helper.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#define ILI9341_RGB_INTERFACE 0xb0 /* RGB Interface Signal Control */
+#define ILI9341_FRC 0xb1 /* Frame Rate Control register */
+#define ILI9341_DFC 0xb6 /* Display Function Control register */
+#define ILI9341_POWER1 0xc0 /* Power Control 1 register */
+#define ILI9341_POWER2 0xc1 /* Power Control 2 register */
+#define ILI9341_VCOM1 0xc5 /* VCOM Control 1 register */
+#define ILI9341_VCOM2 0xc7 /* VCOM Control 2 register */
+#define ILI9341_POWERA 0xcb /* Power control A register */
+#define ILI9341_POWERB 0xcf /* Power control B register */
+#define ILI9341_PGAMMA 0xe0 /* Positive Gamma Correction register */
+#define ILI9341_NGAMMA 0xe1 /* Negative Gamma Correction register */
+#define ILI9341_DTCA 0xe8 /* Driver timing control A */
+#define ILI9341_DTCB 0xea /* Driver timing control B */
+#define ILI9341_POWER_SEQ 0xed /* Power on sequence register */
+#define ILI9341_3GAMMA_EN 0xf2 /* 3 Gamma enable register */
+#define ILI9341_INTERFACE 0xf6 /* Interface control register */
+#define ILI9341_PRC 0xf7 /* Pump ratio control register */
+#define ILI9341_ETMOD 0xb7 /* Entry mode set */
+
+#define ILI9341_MADCTL_BGR BIT(3)
+#define ILI9341_MADCTL_MV BIT(5)
+#define ILI9341_MADCTL_MX BIT(6)
+#define ILI9341_MADCTL_MY BIT(7)
+
+
+#define ILI9341_POWER_B_LEN 3
+#define ILI9341_POWER_SEQ_LEN 4
+#define ILI9341_DTCA_LEN 3
+#define ILI9341_DTCB_LEN 2
+#define ILI9341_POWER_A_LEN 5
+#define ILI9341_DFC_1_LEN 2
+#define ILI9341_FRC_LEN 2
+#define ILI9341_VCOM_1_LEN 2
+#define ILI9341_DFC_2_LEN 4
+#define ILI9341_COLUMN_ADDR_LEN 4
+#define ILI9341_PAGE_ADDR_LEN 4
+#define ILI9341_INTERFACE_LEN 3
+#define ILI9341_PGAMMA_LEN 15
+#define ILI9341_NGAMMA_LEN 15
+#define ILI9341_CA_LEN 3
+
+#define ILI9341_PIXEL_DPI_16_BITS (BIT(6)|BIT(4))
+#define ILI9341_PIXEL_DPI_18_BITS (BIT(6)|BIT(5))
+#define ILI9341_GAMMA_CURVE_1 BIT(0)
+#define ILI9341_IF_WE_MODE BIT(0)
+#define ILI9341_IF_BIG_ENDIAN 0x00
+#define ILI9341_IF_DM_RGB BIT(2)
+#define ILI9341_IF_DM_INTERNAL 0x00
+#define ILI9341_IF_DM_VSYNC BIT(3)
+#define ILI9341_IF_RM_RGB BIT(1)
+#define ILI9341_IF_RIM_RGB 0x00
+
+#define ILI9341_COLUMN_ADDR 0x00ef
+#define ILI9341_PAGE_ADDR 0x013f
+
+#define ILI9341_RGB_EPL BIT(0)
+#define ILI9341_RGB_DPL BIT(1)
+#define ILI9341_RGB_HSPL BIT(2)
+#define ILI9341_RGB_VSPL BIT(3)
+#define ILI9341_RGB_DE_MODE BIT(6)
+#define ILI9341_RGB_DISP_PATH_MEM BIT(7)
+
+#define ILI9341_DBI_VCOMH_4P6V 0x23
+#define ILI9341_DBI_PWR_2_DEFAULT 0x10
+#define ILI9341_DBI_PRC_NORMAL 0x20
+#define ILI9341_DBI_VCOM_1_VMH_4P25V 0x3e
+#define ILI9341_DBI_VCOM_1_VML_1P5V 0x28
+#define ILI9341_DBI_VCOM_2_DEC_58 0x86
+#define ILI9341_DBI_FRC_DIVA 0x00
+#define ILI9341_DBI_FRC_RTNA 0x1b
+#define ILI9341_DBI_EMS_GAS BIT(0)
+#define ILI9341_DBI_EMS_DTS BIT(1)
+#define ILI9341_DBI_EMS_GON BIT(2)
+/**
+ * ili9341_command - ili9341 command with optional parameter(s)
+ * @ili: struct ili9341
+ * @cmd: Command
+ * @seq...: Optional parameter(s)
+ *
+ * Send command to the controller.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+#define ili9341_command(ili, cmd, seq...) \
+({ \
+ u8 d[] = { seq }; \
+ _ili9341_command(ili, cmd, d, ARRAY_SIZE(d)); \
+})
+
+/**
+ * struct ili9341_config - the system specific ILI9341 configuration
+ * @max_spi_speed: 10000000
+ */
+struct ili9341_config {
+ u32 max_spi_speed;
+
+ const struct drm_display_mode mode;
+ /* TODO: need comments for this register */
+ u8 ca[ILI9341_CA_LEN];
+ /* TODO: need comments for this register */
+ u8 power_b[ILI9341_POWER_B_LEN];
+ /* TODO: need comments for this register */
+ u8 power_seq[ILI9341_POWER_SEQ_LEN];
+ /* TODO: need comments for this register */
+ u8 dtca[ILI9341_DTCA_LEN];
+ /* TODO: need comments for this register */
+ u8 dtcb[ILI9341_DTCB_LEN];
+ /* TODO: need comments for this register */
+ u8 power_a[ILI9341_POWER_A_LEN];
+ /*
+ * Frame Rate Control (In Normal Mode/Full Colors) (B1h)
+ *
+ * Formula to calculate frame frequency:
+ * Frame Rate=fosc/(Clocks per line x Division ratio x
+ * (Lines+VBP+VFP))
+ *
+ * Sets the division ratio for internal clocks of Normal mode at MCU
+ * interface.
+ *
+ * fosc : internal oscillator frequency
+ * Clocks per line : RTNA setting
+ * Division ratio : DIVA setting
+ * Lines : total driving line number
+ * VBP : back porch line number
+ * VFP : front porch line number
+ *
+ * RTNA [4:0] Frame Rate (Hz) RTNA [4:0] Frame Rate (Hz)
+ * 1 0 0 0 0 119 1 1 0 0 0 79
+ * 1 0 0 0 1 112 1 1 0 0 1 76
+ * 1 0 0 1 0 106 1 1 0 1 0 73
+ * 1 0 0 1 1 100 1 1 0 1 1 70(default)
+ * 1 0 1 0 0 95 1 1 1 0 0 68
+ * 1 0 1 0 1 90 1 1 1 0 1 65
+ * 1 0 1 1 0 86 1 1 1 0 1 63
+ * 1 0 1 1 1 83 1 1 1 1 1 61
+ *
+ * DIVA [1:0] : division ratio for internal clocks when Normal mode.
+ *
+ * DIVA [1:0] Division Ratio
+ * 0 0 fosc
+ * 0 1 fosc / 2
+ * 1 0 fosc / 4
+ * 1 1 fosc / 8
+ *
+ */
+ u8 frc[ILI9341_FRC_LEN];
+ /* TODO: need comments for this register */
+ u8 prc;
+ /*
+ * B6h DISCTRL (Display Function Control)
+ * D/CX RDX WRX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX
+ * Command 0 1 M XX 1 0 1 1 0 1 1 0 B6h
+ * 1st Parameter 1 1 M XX 0 0 0 0 PTG[1:0] PT[1:0] 0A
+ * 2nd Parameter 1 1 M XX REV GS SS SM ISC[3:0] 82
+ * 3rd Parameter 1 1 M XX 0 0 NL[5:0] 27
+ * 4th Parameter 1 1 M XX 0 0 PCDIV[5:0] XX
+ *
+ * PTG [1:0]: Set the scan mode in non-display area.
+ * PTG1 | PTG0 | Gate outputs in | Source outputs in | VCOM output
+ * non-display area | non-display area |
+ * 1 0 Interval scan Set with the PT[2:0] bits
+ *
+ * PT [1:0]: Determine source/VCOM output in a non-display area in the
+ * partial display mode.
+ * 1 0 AGND AGND AGND AGND
+ *
+ * REV: Select whether the liquid crystal type is normally white type
+ * or normally black type.
+ * REV Liquid crystal type
+ * 0 Normally black
+ * 1 Normally white
+ *
+ * SS: Select the shift direction of outputs from the source driver.
+ * SS Source Output Scan Direction
+ * 0 S1 -> S720
+ * 1 S720 -> S1
+ *
+ * GS: Sets the direction of scan by the gate driver in the range
+ * determined by SCN [4:0] and NL [4:0]. The scan direction
+ * determined by GS = 0 can be reversed by setting GS = 1.
+ *
+ * GS Gate Output Scan Direction
+ * 0 G1 -> G320
+ * 1 G320 -> G1
+ */
+ u8 dfc_1[ILI9341_DFC_1_LEN];
+ /*
+ * Power Control 1 (C0h)
+ * VRH [5:0]: Set the GVDD level, which is a reference level for the
+ * VCOM level and the grayscale voltage level.
+ *
+ * VRH[5:0] GVDD VRH[5:0] GVDD
+ * 0 0 0 0 0 0 Setting prohibited 1 0 0 0 0 0 4.45 V
+ * 0 0 0 0 0 1 Setting prohibited 1 0 0 0 0 1 4.50 V
+ * 0 0 0 0 1 0 Setting prohibited 1 0 0 0 1 0 4.55 V
+ * 0 0 0 0 1 1 3.00 V 1 0 0 0 1 1 4.60 V
+ * 0 0 0 1 0 0 3.05 V 1 0 0 1 0 0 4.65 V
+ * 0 0 0 1 0 1 3.10 V 1 0 0 1 0 1 4.70 V
+ * 0 0 0 1 1 0 3.15 V 1 0 0 1 1 0 4.75 V
+ * 0 0 0 1 1 1 3.20 V 1 0 0 1 1 1 4.80 V
+ * 0 0 1 0 0 0 3.25 V 1 0 1 0 0 0 4.85 V
+ * 0 0 1 0 0 1 3.30 V 1 0 1 0 0 1 4.90 V
+ * 0 0 1 0 1 0 3.35 V 1 0 1 0 1 0 4.95 V
+ * 0 0 1 0 1 1 3.40 V 1 0 1 0 1 1 5.00 V
+ * 0 0 1 1 0 0 3.45 V 1 0 1 1 0 0 5.05 V
+ * 0 0 1 1 0 1 3.50 V 1 0 1 1 0 1 5.10 V
+ * 0 0 1 1 1 0 3.55 V 1 0 1 1 1 0 5.15 V
+ * 0 0 1 1 1 1 3.60 V 1 0 1 1 1 1 5.20 V
+ * 0 1 0 0 0 0 3.65 V 1 1 0 0 0 0 5.25 V
+ * 0 1 0 0 0 1 3.70 V 1 1 0 0 0 1 5.30 V
+ * 0 1 0 0 1 0 3.75 V 1 1 0 0 1 0 5.35 V
+ * 0 1 0 0 1 1 3.80 V 1 1 0 0 1 1 5.40 V
+ * 0 1 0 1 0 0 3.85 V 1 1 0 1 0 0 5.45 V
+ * 0 1 0 1 0 1 3.90 V 1 1 0 1 0 1 5.50 V
+ * 0 1 0 1 1 0 3.95 V 1 1 0 1 1 0 5.55 V
+ * 0 1 0 1 1 1 4.00 V 1 1 0 1 1 1 5.60 V
+ * 0 1 1 0 0 0 4.05 V 1 1 1 0 0 0 5.65 V
+ * 0 1 1 0 0 1 4.10 V 1 1 1 0 0 1 5.70 V
+ * 0 1 1 0 1 0 4.15 V 1 1 1 0 1 0 5.75 V
+ * 0 1 1 0 1 1 4.20 V 1 1 1 0 1 1 5.80 V
+ * 0 1 1 1 0 0 4.25 V 1 1 1 1 0 0 5.85 V
+ * 0 1 1 1 0 1 4.30 V 1 1 1 1 0 1 5.90 V
+ * 0 1 1 1 1 0 4.35 V 1 1 1 1 1 0 5.95 V
+ * 0 1 1 1 1 1 4.40 V 1 1 1 1 1 1 6.00 V
+ */
+ u8 power_1;
+ /*
+ * Power Control 2 (C1h)
+ *
+ * BT [2:0]: Sets the factor used in the step-up circuits.
+ * Select the optimal step-up factor for the operating voltage. To
+ * reduce power consumption, set a smaller factor.
+ *
+ * BT[2:0] AVDD VGH VGL
+ * 0 0 0 VCI x 2 VCI x 7 VCI x 4
+ * 0 0 1 VCI x 3
+ * 0 1 0 VCI x 6 VCI x 4
+ * 0 1 1 VCI x 3
+ *
+ */
+ u8 power_2;
+ /*
+ * VCOM Control 1(C5h)
+ *
+ * VMH [6:0] : Set the VCOMH voltage
+ *
+ * VMH[6:0] VCOMH(V) VMH[6:0] VCOMH(V) VMH[6:0] VCOMH(V) VMH[6:0] VCOMH
+ * 0000000 2.700 0100000 3.500 1000000 4.300 1100000 5.100
+ * 0000001 2.725 0100001 3.525 1000001 4.325 1100001 5.125
+ * 0000010 2.750 0100010 3.550 1000010 4.350 1100010 5.150
+ * 0000011 2.775 0100011 3.575 1000011 4.375 1100011 5.175
+ * 0000100 2.800 0100100 3.600 1000100 4.400 1100100 5.200
+ * 0000101 2.825 0100101 3.625 1000101 4.425 1100101 5.225
+ * 0000110 2.850 0100110 3.650 1000110 4.450 1100110 5.250
+ * 0000111 2.875 0100111 3.675 1000111 4.475 1100111 5.275
+ * 0001000 2.900 0101000 3.700 1001000 4.500 1101000 5.300
+ * 0001001 2.925 0101001 3.725 1001001 4.525 1101001 5.325
+ * 0001010 2.950 0101010 3.750 1001010 4.550 1101010 5.350
+ * 0001011 2.975 0101011 3.775 1001011 4.575 1101011 5.375
+ * 0001100 3.000 0101100 3.800 1001100 4.600 1101100 5.400
+ * 0001101 3.025 0101101 3.825 1001101 4.625 1101101 5.425
+ * 0001110 3.050 0101110 3.850 1001110 4.650 1101110 5.450
+ * 0001111 3.075 0101111 3.875 1001111 4.675 1101111 5.475
+ * 0010000 3.100 0110000 3.900 1010000 4.700 1110000 5.500
+ * 0010001 3.125 0110001 3.925 1010001 4.725 1110001 5.525
+ * 0010010 3.150 0110010 3.950 1010010 4.750 1110010 5.550
+ * 0010011 3.175 0110011 3.975 1010011 4.775 1110011 5.575
+ * 0010100 3.200 0110100 4.000 1010100 4.800 1110100 5.600
+ * 0010101 3.225 0110101 4.025 1010101 4.825 1110101 5.625
+ * 0010110 3.250 0110110 4.050 1010110 4.850 1110110 5.650
+ * 0010111 3.275 0110111 4.075 1010111 4.875 1110111 5.675
+ * 0011000 3.300 0111000 4.100 1011000 4.900 1111000 5.700
+ * 0011001 3.325 0111001 4.125 1011001 4.925 1111001 5.725
+ * 0011010 3.350 0111010 4.150 1011010 4.950 1111010 5.750
+ * 0011011 3.375 0111011 4.175 1011011 4.975 1111011 5.775
+ * 0011100 3.400 0111100 4.200 1011100 5.000 1111100 5.800
+ * 0011101 3.425 0111101 4.225 1011101 5.025 1111101 5.825
+ * 0011110 3.450 0111110 4.250 1011110 5.050 1111110 5.850
+ * 0011111 3.475 0111111 4.275 1011111 5.075 1111111 5.875
+ *
+ * VML[6:0] : Set the VCOML voltage
+ *
+ * VML[6:0] VCOML(V) VML[6:0] VCOML(V) VML[6:0] VCOML(V) VML[6:0] VCOML
+ * 0000000 -2.500 0100000 -1.700 1000000 -0.900 1100000 -0.100
+ * 0000001 -2.475 0100001 -1.675 1000001 -0.875 1100001 -0.075
+ * 0000010 -2.450 0100010 -1.650 1000010 -0.850 1100010 -0.050
+ * 0000011 -2.425 0100011 -1.625 1000011 -0.825 1100011 -0.025
+ * 0000100 -2.400 0100100 -1.600 1000100 -0.800 1100100 0
+ * 0000101 -2.375 0100101 -1.575 1000101 -0.775 1100101 Reserved
+ * 0000110 -2.350 0100110 -1.550 1000110 -0.750 1100110 Reserved
+ * 0000111 -2.325 0100111 -1.525 1000111 -0.725 1100111 Reserved
+ * 0001000 -2.300 0101000 -1.500 1001000 -0.700 1101000 Reserved
+ * 0001001 -2.275 0101001 -1.475 1001001 -0.675 1101001 Reserved
+ * 0001010 -2.250 0101010 -1.450 1001010 -0.650 1101010 Reserved
+ * 0001011 -2.225 0101011 -1.425 1001011 -0.625 1101011 Reserved
+ * 0001100 -2.200 0101100 -1.400 1001100 -0.600 1101100 Reserved
+ * 0001101 -2.175 0101101 -1.375 1001101 -0.575 1101101 Reserved
+ * 0001110 -2.150 0101110 -1.350 1001110 -0.550 1101110 Reserved
+ * 0001111 -2.125 0101111 -1.325 1001111 -0.525 1101111 Reserved
+ * 0010000 -2.100 0110000 -1.300 1010000 -0.500 1110000 Reserved
+ * 0010001 -2.075 0110001 -1.275 1010001 -0.475 1110001 Reserved
+ * 0010010 -2.050 0110010 -1.250 1010010 -0.450 1110010 Reserved
+ * 0010011 -2.025 0110011 -1.225 1010011 -0.425 1110011 Reserved
+ * 0010100 -2.000 0110100 -1.200 1010100 -0.400 1110100 Reserved
+ * 0010101 -1.975 0110101 -1.175 1010101 -0.375 1110101 Reserved
+ * 0010110 -1.950 0110110 -1.150 1010110 -0.350 1110110 Reserved
+ * 0010111 -1.925 0110111 -1.125 1010111 -0.325 1110111 Reserved
+ * 0011000 -1.900 0111000 -1.100 1011000 -0.300 1111000 Reserved
+ * 0011001 -1.875 0111001 -1.075 1011001 -0.275 1111001 Reserved
+ * 0011010 -1.850 0111010 -1.050 1011010 -0.250 1111010 Reserved
+ * 0011011 -1.825 0111011 -1.025 1011011 -0.225 1111011 Reserved
+ * 0011100 -1.800 0111100 -1.000 1011100 -0.200 1111100 Reserved
+ * 0011101 -1.775 0111101 -0.975 1011101 -0.175 1111101 Reserved
+ * 0011110 -1.750 0111110 -0.950 1011110 -0.150 1111110 Reserved
+ * 0011111 -1.725 0111111 -0.925 1011111 -0.125 1111111 Reserved
+ */
+ u8 vcom_1[ILI9341_VCOM_1_LEN];
+ /*
+ * VCOM Control 2(C7h)
+ *
+ * C7h VMCTRL1 (VCOM Control 1)
+ * D/CX RDX WRX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX
+ * Command 0 1 M XX 1 1 0 0 0 1 1 1 C7h
+ * Parameter 1 1 M XX nVM VMF[6:0] C0
+ *
+ * nVM: nVM equals to “0” after power on reset and VCOM offset
+ * equals to program MTP value. When nVM set to “1”, setting
+ * of VMF [6:0] becomes valid and VCOMH/VCOML can be adjusted.
+ *
+ * VMF [6:0]: Set the VCOM offset voltage.
+ */
+ u8 vcom_2;
+ /*
+ * Memory Access Control (36h)
+ *
+ * 36h MADCTL (Memory Access Control)
+ * D/CX RDX WRX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX
+ * Command 0 1 M XX 0 0 1 1 0 1 1 0 36h
+ * Parameter 1 1 M XX MY MX MV ML BGR MH 0 0 00
+ *
+ * This command defines read/write scanning direction of frame memory.
+ * This command makes no change on the other driver status.
+ *
+ * Bit Name Description
+ * MY Row Address Order
+ * MX Column Address Order
+ * MV Row / Column Exchange These 3 bits control MCU to memory
+ * write/read direction.
+ * ML Vertical Refresh Order LCD vertical refresh direction control.
+ * BGR RGB-BGR Order Color selector switch control
+ * (0=RGB color filter panel, 1=BGR
+ * color filter panel)
+ * MH Horizontal Refresh ORDER LCD horizontal refreshing
+ * direction control.
+ *
+ * Note: When BGR bit is changed, the new setting is active
+ * immediately without update the content in Frame Memory again.
+ *
+ */
+ u8 address_mode;
+ /* TODO: need comments for this register */
+ u8 g3amma_en;
+ /* RGB Interface Signal Control (B0h)
+ *
+ * B0h IFMODE (Interface Mode Control)
+ * D/CX RDX WRX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX
+ * Command 0 1 M XX 1 0 1 1 0 0 0 0 B0h
+ * Parameter 1 1 M XX ByPass_MODE RCM[1] RCM[0] 0 VSPL HSPL DPL EPL 40
+ *
+ * Sets the operation status of the display interface. The setting
+ * becomes effective as soon as the command is received.
+ * EPL: DE polarity (“0”= High enable for RGB interface, “1”= Low
+ * enable for RGB interface)
+ *
+ * DPL: DOTCLK polarity set (“0”= data fetched at the rising time,
+ * “1”= data fetched at the falling time)
+ *
+ * HSPL: HSYNC polarity (“0”= Low level sync clock, “1”= High
+ * level sync clock)
+ *
+ * VSPL: VSYNC polarity (“0”= Low level sync clock, “1”= High
+ * level sync clock)
+ *
+ * RCM [1:0]: RGB interface selection (refer to the RGB interface
+ * section).
+ *
+ * ByPass_MODE: Select display data path whether Memory or Direct to
+ * Shift register when RGB Interface is used.
+ *
+ * ByPass_MODE Display Data Path
+ * 0 Direct to Shift Register (default)
+ * 1 Memory
+ */
+ u8 rgb_interface;
+ /* refer to dfc_1 */
+ u8 dfc_2[ILI9341_DFC_2_LEN];
+ /*
+ * Column Address Set (2Ah)
+ * This command is used to define area of frame memory where MCU can
+ * access. This command makes no change on the
+ * other driver status. The values of SC [15:0] and EC [15:0] are
+ * referred when RAMWR command comes. Each value
+ * represents one column line in the Frame Memory.
+ */
+ u8 column_addr[ILI9341_COLUMN_ADDR_LEN];
+ /*
+ * Page Address Set (2Bh)
+ * This command is used to define area of frame memory where MCU can
+ * access. This command makes no change on the
+ * other driver status. The values of SP [15:0] and EP [15:0] are
+ * referred when RAMWR command comes. Each value
+ * represents one Page line in the Frame Memory.
+ */
+ u8 page_addr[ILI9341_PAGE_ADDR_LEN];
+ /*
+ * Interface Control (F6h)
+ *
+ * F6h IFCTL (16bits Data Format Selection)
+ * D/CX RDX WRX D17-8 D7 D6 D5 D4 D3 D2 D1 D0 HEX
+ * Command 0 1 M XX 1 1 1 1 0 1 1 0 F6h
+ * 1stParameter 1 1 M XX MY MX MV
+ * _EOR _EOR _EOR 0 BGR_EOR 0 0 WE MODE 01
+ * 2ndParameter 1 1 M XX 0 0 EPF[1] EPF[0] 0 0 MDT[1] MDT[0] 00
+ * 3rdParameter 1 1 M XX 0 0 ENDIAN 0 DM[1] DM[0] RM RIM 00
+ *
+ */
+ u8 interface[ILI9341_INTERFACE_LEN];
+ /*
+ * This command sets the pixel format for the RGB image data used by
+ * the interface. DPI [2:0] is the pixel format select of RGB
+ * interface and DBI [2:0] is the pixel format of MCU interface. If a
+ * particular interface, either RGB interface or MCU interface, is
+ * not used then the corresponding bits in the parameter are ignored.
+ * The pixel format is shown in the table below.
+ *
+ * DPI[2:0] RGB Interface Format DBI[2:0] MCU Interface Format
+ * 0 0 0 Reserved 0 0 0 Reserved
+ * 0 0 1 Reserved 0 0 1 Reserved
+ * 0 1 0 Reserved 0 1 0 Reserved
+ * 0 1 1 Reserved 0 1 1 Reserved
+ * 1 0 0 Reserved 1 0 0 Reserved
+ * 1 0 1 16 bits / pixel 1 0 1 16 bits / pixel
+ * 1 1 0 18 bits / pixel 1 1 0 18 bits / pixel
+ * 1 1 1 Reserved 1 1 1 Reserved
+ *
+ */
+ u8 pixel_format;
+ /*
+ * This command is used to select the desired Gamma curve for the
+ * current display. A maximum of 4 fixed gamma curves can
+ * be selected. The curve is selected by setting the appropriate bit
+ * in the parameter as described in the Table:
+ *
+ * GC [7:0] Curve Selected
+ * 01h Gamma curve 1 (G2.2)
+ * 02h ---
+ * 04h ---
+ * 08h ---
+ */
+ u8 gamma_curve;
+ /*
+ * Positive Gamma Correction (E0h)
+ *
+ * Set the gray scale voltage to adjust the gamma characteristics of
+ * the TFT panel.
+ */
+ u8 pgamma[ILI9341_PGAMMA_LEN];
+ /*
+ * Negative Gamma Correction (E1h)
+ *
+ * Set the gray scale voltage to adjust the gamma characteristics of
+ * the TFT panel.
+ */
+ u8 ngamma[ILI9341_NGAMMA_LEN];
+};
+
+struct ili9341 {
+ struct device *dev;
+ const struct ili9341_config *conf;
+ struct drm_panel panel;
+ struct gpio_desc *reset_gpio;
+ struct gpio_desc *dc_gpio;
+ u32 max_spi_speed;
+ struct regulator *vcc;
+};
+
+/*
+ * The Stm32f429-disco board has a panel ili9341 connected to ltdc controller
+ */
+static const struct ili9341_config ili9341_stm32f429_disco_data = {
+ .max_spi_speed = 10000000,
+ .mode = {
+ .clock = 6100,
+ .hdisplay = 240,
+ .hsync_start = 240 + 10,/* hfp 10 */
+ .hsync_end = 240 + 10 + 10,/* hsync 10 */
+ .htotal = 240 + 10 + 10 + 20,/* hbp 20 */
+ .vdisplay = 320,
+ .vsync_start = 320 + 4,/* vfp 4 */
+ .vsync_end = 320 + 4 + 2,/* vsync 2 */
+ .vtotal = 320 + 4 + 2 + 2,/* vbp 2 */
+ .vrefresh = 60,
+ .flags = 0,
+ .width_mm = 65,
+ .height_mm = 50,
+ .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+ },
+ /* TODO: need comments for this register */
+ .ca = {0xc3, 0x08, 0x50},
+ /* TODO: need comments for this register */
+ .power_b = {0x00, 0xc1, 0x30},
+ /* TODO: need comments for this register */
+ .power_seq = {0x64, 0x03, 0x12, 0x81},
+ /* TODO: need comments for this register */
+ .dtca = {0x85, 0x00, 0x78},
+ /* TODO: need comments for this register */
+ .power_a = {0x39, 0x2c, 0x00, 0x34, 0x02},
+ /* TODO: need comments for this register */
+ .prc = 0x20,
+ /* TODO: need comments for this register */
+ .dtcb = {0x00, 0x00},
+ /* 0x00 fosc, 0x1b 70hz */
+ .frc = {0x00, 0x1b},
+ /* 0x0a Interval scan, AGND AGND AGND AGND
+ * 0xa2 Normally white, G1 -> G320, S720 -> S1,
+ * Scan Cycle 5 frames,85ms
+ */
+ .dfc_1 = {0x0a, 0xa2},
+ /* 0x10 3.65v */
+ .power_1 = 0x10,
+ /* 0x10 AVDD=vci*2, VGH=vci*7, VGL=-vci*4 */
+ .power_2 = 0x10,
+ /* 0x45 VCOMH 4.425v, 0x15 VCOML -1.975*/
+ .vcom_1 = {0x45, 0x15},
+ /* 0x90 offset voltage, VMH-48, VML-48 */
+ .vcom_2 = 0x90,
+ /* 0xc8 Row Address Order, Column Address Order
+ * BGR 1
+ */
+ .address_mode = 0xc8,
+ .g3amma_en = 0x00,
+ /* 0xc2
+ * Display Data Path: Memory
+ * RGB: DE mode
+ * DOTCLK polarity set (data fetched at the falling time)
+ */
+ .rgb_interface = ILI9341_RGB_DISP_PATH_MEM |
+ ILI9341_RGB_DE_MODE |
+ ILI9341_RGB_DPL,
+ /*
+ * 0x0a
+ * Gate outputs in non-display area: Interval scan
+ * Determine source/VCOM output in a non-display area in the partial
+ * display mode: AGND AGND AGND AGND
+ *
+ * 0xa7
+ * Scan Cycle: 15 frames
+ * fFLM = 60Hz: 255ms
+ * Liquid crystal type: Normally white
+ * Gate Output Scan Direction: G1 -> G320
+ * Source Output Scan Direction: S720 -> S1
+ *
+ * 0x27
+ * LCD Driver Line: 320 lines
+ *
+ * 0x04
+ * PCDIV: 4
+ */
+ .dfc_2 = {0x0a, 0xa7, 0x27, 0x04},
+ /* column address: 240 */
+ .column_addr = {0x00, 0x00, (ILI9341_COLUMN_ADDR >> 4) & 0xff,
+ ILI9341_COLUMN_ADDR & 0xff},
+ /* page address: 320 */
+ .page_addr = {0x00, 0x00, (ILI9341_PAGE_ADDR >> 4) & 0xff,
+ ILI9341_PAGE_ADDR & 0xff},
+ /* Memory write control: When the transfer number of data exceeds
+ * (EC-SC+1)*(EP-SP+1), the column and page number will be
+ * reset, and the exceeding data will be written into the following
+ * column and page.
+ * Display Operation Mode: RGB Interface Mode
+ * Interface for RAM Access: RGB interface
+ * 16- bit RGB interface (1 transfer/pixel)
+ */
+ .interface = {ILI9341_IF_WE_MODE, 0x00,
+ ILI9341_IF_DM_RGB | ILI9341_IF_RM_RGB},
+ /* DPI: 16 bits / pixel */
+ .pixel_format = ILI9341_PIXEL_DPI_16_BITS,
+ /* Curve Selected: Gamma curve 1 (G2.2) */
+ .gamma_curve = ILI9341_GAMMA_CURVE_1,
+ .pgamma = {0x0f, 0x29, 0x24, 0x0c, 0x0e,
+ 0x09, 0x4e, 0x78, 0x3c, 0x09,
+ 0x13, 0x05, 0x17, 0x11, 0x00},
+ .ngamma = {0x00, 0x16, 0x1b, 0x04, 0x11,
+ 0x07, 0x31, 0x33, 0x42, 0x05,
+ 0x0c, 0x0a, 0x28, 0x2f, 0x0f},
+};
+static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
+{
+ return container_of(panel, struct ili9341, panel);
+}
+
+int ili9341_spi_transfer(struct spi_device *spi, u32 speed_hz,
+ u8 bpw, const void *buf, size_t len)
+{
+ size_t max_chunk = spi_max_transfer_size(spi);
+ struct spi_transfer tr = {
+ .bits_per_word = bpw,
+ .speed_hz = speed_hz,
+ .len = len,
+ };
+ struct spi_message m;
+ size_t chunk;
+ int ret;
+
+ spi_message_init_with_transfers(&m, &tr, 1);
+
+ while (len) {
+ chunk = min(len, max_chunk);
+
+ tr.tx_buf = buf;
+ tr.len = chunk;
+ buf += chunk;
+ len -= chunk;
+
+ ret = spi_sync(spi, &m);
+ if (ret) {
+ dev_err(&spi->dev, "spi_sync error: %d\n", ret);
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static int _ili9341_command(struct ili9341 *ili, u8 cmd, const void *data,
+ size_t count)
+{
+ struct spi_device *spi = to_spi_device(ili->dev);
+ int ret = 0;
+
+ gpiod_set_value_cansleep(ili->dc_gpio, 0);
+
+ ret = ili9341_spi_transfer(spi, ili->max_spi_speed, 8,
+ (const void *)&cmd, 1);
+ if (ret || data == NULL || count == 0)
+ return ret;
+
+ gpiod_set_value_cansleep(ili->dc_gpio, 1);
+
+ return ili9341_spi_transfer(spi, ili->max_spi_speed, 8,
+ data, count);
+}
+
+static int ili9341_dpi_init(struct ili9341 *ili)
+{
+ int ret;
+ ret = _ili9341_command(ili, 0xca,
+ ili->conf->ca,
+ ILI9341_CA_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_POWERB,
+ ili->conf->power_b,
+ ILI9341_POWER_B_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_POWER_SEQ,
+ ili->conf->power_seq,
+ ILI9341_POWER_SEQ_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_DTCA,
+ ili->conf->dtca,
+ ILI9341_DTCA_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_POWERA,
+ ili->conf->power_a,
+ ILI9341_POWER_A_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_PRC,
+ &ili->conf->prc,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_DTCB,
+ ili->conf->dtcb,
+ ILI9341_DTCB_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_FRC,
+ ili->conf->frc,
+ ILI9341_FRC_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_DFC,
+ ili->conf->dfc_1,
+ ILI9341_DFC_1_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_POWER1,
+ &ili->conf->power_1,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_POWER2,
+ &ili->conf->power_2,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_VCOM1,
+ ili->conf->vcom_1,
+ ILI9341_VCOM_1_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_VCOM2,
+ &ili->conf->vcom_2,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, MIPI_DCS_SET_ADDRESS_MODE,
+ &ili->conf->address_mode,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_3GAMMA_EN,
+ &ili->conf->g3amma_en,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_RGB_INTERFACE,
+ &ili->conf->rgb_interface,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_DFC,
+ ili->conf->dfc_2,
+ ILI9341_DFC_2_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, MIPI_DCS_SET_COLUMN_ADDRESS,
+ ili->conf->column_addr,
+ ILI9341_COLUMN_ADDR_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, MIPI_DCS_SET_PAGE_ADDRESS,
+ ili->conf->page_addr,
+ ILI9341_PAGE_ADDR_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_INTERFACE,
+ ili->conf->interface,
+ ILI9341_INTERFACE_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, MIPI_DCS_SET_PIXEL_FORMAT,
+ &ili->conf->pixel_format,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = ili9341_command(ili, MIPI_DCS_WRITE_MEMORY_START);
+ if (ret)
+ return ret;
+
+ msleep(200);
+ ret = _ili9341_command(ili, MIPI_DCS_SET_GAMMA_CURVE,
+ &ili->conf->gamma_curve,
+ 1);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_PGAMMA,
+ ili->conf->pgamma,
+ ILI9341_PGAMMA_LEN);
+ if (ret)
+ return ret;
+
+ ret = _ili9341_command(ili, ILI9341_NGAMMA,
+ ili->conf->ngamma,
+ ILI9341_NGAMMA_LEN);
+ if (ret)
+ return ret;
+
+ ret = ili9341_command(ili, MIPI_DCS_EXIT_SLEEP_MODE);
+ if (ret)
+ return ret;
+
+ msleep(200);
+ ret = ili9341_command(ili, MIPI_DCS_SET_DISPLAY_ON);
+ if (ret)
+ return ret;
+
+ ret = ili9341_command(ili, MIPI_DCS_WRITE_MEMORY_START);
+ if (ret)
+ return ret;
+
+
+ dev_info(ili->dev, "initialized display rgb interface\n");
+
+ return 0;
+}
+
+static int ili9341_dpi_power_on(struct ili9341 *ili)
+{
+ int ret = 0;
+
+ /* Assert RESET */
+ gpiod_set_value(ili->reset_gpio, 1);
+
+ /* Enable power */
+ if (!IS_ERR(ili->vcc)) {
+ ret = regulator_enable(ili->vcc);
+ if (ret < 0) {
+ dev_err(ili->dev, "unable to enable vcc\n");
+ return ret;
+ }
+ }
+ msleep(20);
+
+ /* De-assert RESET */
+ gpiod_set_value(ili->reset_gpio, 0);
+ msleep(10);
+
+ return 0;
+}
+
+static int ili9341_dpi_power_off(struct ili9341 *ili)
+{
+ /* Assert RESET */
+ gpiod_set_value(ili->reset_gpio, 1);
+
+ /* Disable power */
+ if (!IS_ERR(ili->vcc))
+ return regulator_disable(ili->vcc);
+
+ return 0;
+}
+
+static int ili9341_dpi_disable(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+
+ ili9341_command(ili, MIPI_DCS_SET_DISPLAY_OFF);
+
+ return 0;
+}
+
+static int ili9341_dpi_unprepare(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+
+ return ili9341_dpi_power_off(ili);
+}
+
+static int ili9341_dpi_prepare(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+ int ret;
+
+ ret = ili9341_dpi_power_on(ili);
+ if (ret < 0)
+ return ret;
+
+ ret = ili9341_dpi_init(ili);
+ if (ret < 0)
+ ili9341_dpi_unprepare(panel);
+
+ return ret;
+}
+
+static int ili9341_dpi_enable(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+
+ ili9341_command(ili, MIPI_DCS_SET_DISPLAY_ON);
+
+ return 0;
+}
+
+static int ili9341_dpi_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+ struct drm_device *drm = connector->dev;
+ struct drm_display_mode *mode;
+ struct drm_display_info *info;
+
+ info = &connector->display_info;
+ info->width_mm = ili->conf->mode.width_mm;
+ info->height_mm = ili->conf->mode.height_mm;
+
+ if (ili->conf->rgb_interface & ILI9341_RGB_DPL)
+ info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
+ else
+ info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
+
+ if (ili->conf->rgb_interface & ILI9341_RGB_EPL)
+ info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+ else
+ info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
+
+ mode = drm_mode_duplicate(drm, &ili->conf->mode);
+ if (!mode) {
+ DRM_ERROR("bad mode or failed to add mode\n");
+ return -EINVAL;
+ }
+ drm_mode_set_name(mode);
+
+ /* Set up the polarity */
+ if (ili->conf->rgb_interface & ILI9341_RGB_HSPL)
+ mode->flags |= DRM_MODE_FLAG_PHSYNC;
+ else
+ mode->flags |= DRM_MODE_FLAG_NHSYNC;
+
+ if (ili->conf->rgb_interface & ILI9341_RGB_VSPL)
+ mode->flags |= DRM_MODE_FLAG_PVSYNC;
+ else
+ mode->flags |= DRM_MODE_FLAG_NVSYNC;
+
+ drm_mode_probed_add(connector, mode);
+
+ return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs ili9341_dpi_funcs = {
+ .disable = ili9341_dpi_disable,
+ .unprepare = ili9341_dpi_unprepare,
+ .prepare = ili9341_dpi_prepare,
+ .enable = ili9341_dpi_enable,
+ .get_modes = ili9341_dpi_get_modes,
+};
+
+static int ili9341_dpi_probe(struct spi_device *spi)
+{
+ int ret;
+ struct device *dev = &spi->dev;
+ struct ili9341 *ili;
+
+ ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
+ if (!ili)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, ili);
+
+ ili->dev = dev;
+ /*
+ * Every new incarnation of this display must have a unique
+ * data entry for the system in this driver.
+ */
+ ili->conf = of_device_get_match_data(dev);
+ if (!ili->conf) {
+ dev_err(dev, "missing device configuration\n");
+ return -ENODEV;
+ }
+
+ ili->vcc = devm_regulator_get_optional(dev, "vcc");
+ if (IS_ERR(ili->vcc))
+ dev_err(dev, "get optional vcc failed\n");
+
+ ili->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(ili->reset_gpio)) {
+ dev_err(dev, "failed to get RESET GPIO\n");
+ return PTR_ERR(ili->reset_gpio);
+ }
+
+ ili->dc_gpio = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(ili->dc_gpio)) {
+ dev_err(dev, "failed to get DC GPIO\n");
+ return PTR_ERR(ili->dc_gpio);
+ }
+
+ spi->bits_per_word = 8;
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(dev, "spi setup failed.\n");
+ return ret;
+ }
+
+ ili->max_spi_speed = ili->conf->max_spi_speed;
+
+ drm_panel_init(&ili->panel, dev, &ili9341_dpi_funcs,
+ DRM_MODE_CONNECTOR_DPI);
+
+ return drm_panel_add(&ili->panel);
+}
+
+
+
+static void ili9341_dbi_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{
+ struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
+ struct mipi_dbi *dbi = &dbidev->dbi;
+ u8 addr_mode;
+ int ret, idx;
+
+ if (!drm_dev_enter(pipe->crtc.dev, &idx))
+ return;
+
+ DRM_DEBUG_KMS("\n");
+
+ ret = mipi_dbi_poweron_conditional_reset(dbidev);
+ if (ret < 0)
+ goto out_exit;
+ if (ret == 1)
+ goto out_enable;
+
+ mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
+
+ mipi_dbi_command(dbi, ILI9341_POWERB, 0x00, 0xc1, 0x30);
+ mipi_dbi_command(dbi, ILI9341_POWER_SEQ, 0x64, 0x03, 0x12, 0x81);
+ mipi_dbi_command(dbi, ILI9341_DTCA, 0x85, 0x00, 0x78);
+ mipi_dbi_command(dbi, ILI9341_POWERA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+ mipi_dbi_command(dbi, ILI9341_PRC, ILI9341_DBI_PRC_NORMAL);
+ mipi_dbi_command(dbi, ILI9341_DTCB, 0x00, 0x00);
+
+ /* Power Control */
+ mipi_dbi_command(dbi, ILI9341_POWER1, ILI9341_DBI_VCOMH_4P6V);
+ mipi_dbi_command(dbi, ILI9341_POWER2, ILI9341_DBI_PWR_2_DEFAULT);
+ /* VCOM */
+ mipi_dbi_command(dbi, ILI9341_VCOM1, ILI9341_DBI_VCOM_1_VMH_4P25V,
+ ILI9341_DBI_VCOM_1_VML_1P5V);
+ mipi_dbi_command(dbi, ILI9341_VCOM2, ILI9341_DBI_VCOM_2_DEC_58);
+
+ /* Memory Access Control */
+ mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
+ MIPI_DCS_PIXEL_FMT_16BIT);
+
+ /* Frame Rate */
+ mipi_dbi_command(dbi, ILI9341_FRC, ILI9341_DBI_FRC_DIVA & 0x03,
+ ILI9341_DBI_FRC_RTNA & 0x1f);
+
+ /* Gamma */
+ mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, 0x00);
+ mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, ILI9341_GAMMA_CURVE_1);
+ mipi_dbi_command(dbi, ILI9341_PGAMMA,
+ 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
+ 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
+ mipi_dbi_command(dbi, ILI9341_NGAMMA,
+ 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
+ 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
+
+ /* DDRAM */
+ mipi_dbi_command(dbi, ILI9341_ETMOD, ILI9341_DBI_EMS_GAS |
+ ILI9341_DBI_EMS_DTS |
+ ILI9341_DBI_EMS_GON);
+
+ /* Display */
+ mipi_dbi_command(dbi, ILI9341_DFC, 0x08, 0x82, 0x27, 0x00);
+ mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+ msleep(100);
+
+ mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+ msleep(100);
+
+out_enable:
+ switch (dbidev->rotation) {
+ default:
+ addr_mode = ILI9341_MADCTL_MX;
+ break;
+ case 90:
+ addr_mode = ILI9341_MADCTL_MV;
+ break;
+ case 180:
+ addr_mode = ILI9341_MADCTL_MY;
+ break;
+ case 270:
+ addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+ ILI9341_MADCTL_MX;
+ break;
+ }
+ addr_mode |= ILI9341_MADCTL_BGR;
+ mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+ mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
+ DRM_DEBUG_KMS("initialized display serial interface\n");
+out_exit:
+ drm_dev_exit(idx);
+}
+
+static const struct drm_simple_display_pipe_funcs ili9341_dbi_funcs = {
+ .enable = ili9341_dbi_enable,
+ .disable = mipi_dbi_pipe_disable,
+ .update = mipi_dbi_pipe_update,
+ .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode ili9341_dbi_mode = {
+ DRM_SIMPLE_MODE(240, 320, 37, 49),
+};
+
+DEFINE_DRM_GEM_CMA_FOPS(ili9341_dbi_fops);
+
+static struct drm_driver ili9341_dbi_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .fops = &ili9341_dbi_fops,
+ .release = mipi_dbi_release,
+ DRM_GEM_CMA_VMAP_DRIVER_OPS,
+ .debugfs_init = mipi_dbi_debugfs_init,
+ .name = "ili9341",
+ .desc = "Ilitek ILI9341",
+ .date = "20180514",
+ .major = 1,
+ .minor = 0,
+};
+static int ili9341_dbi_probe(struct spi_device *spi)
+{
+ struct mipi_dbi_dev *dbidev;
+ struct drm_device *drm;
+ struct mipi_dbi *dbi;
+ struct gpio_desc *dc;
+ struct device *dev = &spi->dev;
+ u32 rotation = 0;
+ int ret;
+
+ dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
+ if (!dbidev)
+ return -ENOMEM;
+
+ dbi = &dbidev->dbi;
+ drm = &dbidev->drm;
+ ret = devm_drm_dev_init(dev, drm, &ili9341_dbi_driver);
+ if (ret) {
+ kfree(dbidev);
+ return ret;
+ }
+
+ drm_mode_config_init(drm);
+
+ dbi->reset = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(dbi->reset)) {
+ DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
+ return PTR_ERR(dbi->reset);
+ }
+
+ dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(dc)) {
+ DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
+ return PTR_ERR(dc);
+ }
+
+ dbidev->regulator = devm_regulator_get_optional(dev, "vcc");
+ if (IS_ERR(dbidev->regulator))
+ dev_err(dev, "get optional vcc failed\n");
+
+ dbidev->backlight = devm_of_find_backlight(dev);
+ if (IS_ERR(dbidev->backlight))
+ return PTR_ERR(dbidev->backlight);
+
+ device_property_read_u32(dev, "rotation", &rotation);
+
+ ret = mipi_dbi_spi_init(spi, dbi, dc);
+ if (ret)
+ return ret;
+
+ ret = mipi_dbi_dev_init(dbidev, &ili9341_dbi_funcs,
+ &ili9341_dbi_mode, rotation);
+ if (ret)
+ return ret;
+
+ drm_mode_config_reset(drm);
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, drm);
+
+ drm_fbdev_generic_setup(drm, 0);
+
+ return 0;
+}
+static int ili9341_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+
+ if (!strcmp(id->name, "sf-tc240t-9370-t"))
+ return ili9341_dpi_probe(spi);
+ else if (!strcmp(id->name, "yx240qv29"))
+ return ili9341_dbi_probe(spi);
+
+ return -1;
+}
+
+static int ili9341_remove(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct ili9341 *ili = spi_get_drvdata(spi);
+ struct drm_device *drm = spi_get_drvdata(spi);
+
+ if (!strcmp(id->name, "sf-tc240t-9370-t")) {
+ ili9341_dpi_power_off(ili);
+ drm_panel_remove(&ili->panel);
+ } else if (!strcmp(id->name, "yx240qv29")) {
+ drm_dev_unplug(drm);
+ drm_atomic_helper_shutdown(drm);
+ }
+ return 0;
+}
+
+static void ili9341_shutdown(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+
+ if (!strcmp(id->name, "yx240qv29"))
+ drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static const struct of_device_id ili9341_of_match[] = {
+ {
+ .compatible = "st,sf-tc240t-9370-t",
+ .data = &ili9341_stm32f429_disco_data,
+ },
+ {
+ /* porting from tiny/ili9341.c
+ * for original mipi dbi compitable
+ */
+ .compatible = "adafruit,yx240qv29",
+ .data = NULL,
+ },
+};
+MODULE_DEVICE_TABLE(of, ili9341_of_match);
+
+static const struct spi_device_id ili9341_id[] = {
+ { "yx240qv29", 0 },
+ { "sf-tc240t-9370-t", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, ili9341_id);
+
+static struct spi_driver ili9341_driver = {
+ .probe = ili9341_probe,
+ .remove = ili9341_remove,
+ .shutdown = ili9341_shutdown,
+ .id_table = ili9341_id,
+ .driver = {
+ .name = "panel-ilitek-ili9341",
+ .of_match_table = ili9341_of_match,
+ },
+};
+module_spi_driver(ili9341_driver);
+
+MODULE_AUTHOR("Dillon Min <dillon.minfei@gmail.com>");
+MODULE_DESCRIPTION("ILI9341 LCD panel driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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