354 lines
9.9 KiB
C
354 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Panel driver for the Samsung LMS397KF04 480x800 DPI RGB panel.
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* According to the data sheet the display controller is called DB7430.
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* Found in the Samsung Galaxy Beam GT-I8350 mobile phone.
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* Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <drm/drm_mipi_dbi.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_panel.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/media-bus-format.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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#include <video/mipi_display.h>
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#define DB7430_ACCESS_PROT_OFF 0xb0
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#define DB7430_UNKNOWN_B4 0xb4
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#define DB7430_USER_SELECT 0xb5
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#define DB7430_UNKNOWN_B7 0xb7
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#define DB7430_UNKNOWN_B8 0xb8
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#define DB7430_PANEL_DRIVING 0xc0
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#define DB7430_SOURCE_CONTROL 0xc1
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#define DB7430_GATE_INTERFACE 0xc4
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#define DB7430_DISPLAY_H_TIMING 0xc5
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#define DB7430_RGB_SYNC_OPTION 0xc6
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#define DB7430_GAMMA_SET_RED 0xc8
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#define DB7430_GAMMA_SET_GREEN 0xc9
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#define DB7430_GAMMA_SET_BLUE 0xca
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#define DB7430_BIAS_CURRENT_CTRL 0xd1
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#define DB7430_DDV_CTRL 0xd2
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#define DB7430_GAMMA_CTRL_REF 0xd3
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#define DB7430_UNKNOWN_D4 0xd4
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#define DB7430_DCDC_CTRL 0xd5
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#define DB7430_VCL_CTRL 0xd6
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#define DB7430_UNKNOWN_F8 0xf8
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#define DB7430_UNKNOWN_FC 0xfc
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#define DATA_MASK 0x100
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/**
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* struct db7430 - state container for a panel controlled by the DB7430
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* controller
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*/
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struct db7430 {
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/** @dev: the container device */
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struct device *dev;
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/** @dbi: the DBI bus abstraction handle */
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struct mipi_dbi dbi;
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/** @panel: the DRM panel instance for this device */
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struct drm_panel panel;
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/** @width: the width of this panel in mm */
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u32 width;
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/** @height: the height of this panel in mm */
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u32 height;
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/** @reset: reset GPIO line */
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struct gpio_desc *reset;
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/** @regulators: VCCIO and VIO supply regulators */
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struct regulator_bulk_data regulators[2];
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};
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static const struct drm_display_mode db7430_480_800_mode = {
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/*
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* 31 ns period min (htotal*vtotal*vrefresh)/1000
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* gives a Vrefresh of ~71 Hz.
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*/
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.clock = 32258,
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.hdisplay = 480,
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.hsync_start = 480 + 10,
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.hsync_end = 480 + 10 + 4,
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.htotal = 480 + 10 + 4 + 40,
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.vdisplay = 800,
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.vsync_start = 800 + 6,
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.vsync_end = 800 + 6 + 1,
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.vtotal = 800 + 6 + 1 + 7,
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.width_mm = 53,
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.height_mm = 87,
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.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
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};
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static inline struct db7430 *to_db7430(struct drm_panel *panel)
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{
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return container_of(panel, struct db7430, panel);
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}
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static int db7430_power_on(struct db7430 *db)
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{
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struct mipi_dbi *dbi = &db->dbi;
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int ret;
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/* Power up */
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ret = regulator_bulk_enable(ARRAY_SIZE(db->regulators),
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db->regulators);
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if (ret) {
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dev_err(db->dev, "failed to enable regulators: %d\n", ret);
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return ret;
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}
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msleep(50);
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/* Assert reset >=1 ms */
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gpiod_set_value_cansleep(db->reset, 1);
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usleep_range(1000, 5000);
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/* De-assert reset */
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gpiod_set_value_cansleep(db->reset, 0);
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/* Wait >= 10 ms */
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msleep(10);
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dev_dbg(db->dev, "de-asserted RESET\n");
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/*
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* This is set to 0x0a (RGB/BGR order + horizontal flip) in order
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* to make the display behave normally. If this is not set the displays
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* normal output behaviour is horizontally flipped and BGR ordered. Do
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* it twice because the first message doesn't always "take".
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*/
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mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x0a);
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mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, 0x0a);
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mipi_dbi_command(dbi, DB7430_ACCESS_PROT_OFF, 0x00);
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mipi_dbi_command(dbi, DB7430_PANEL_DRIVING, 0x28, 0x08);
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mipi_dbi_command(dbi, DB7430_SOURCE_CONTROL,
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0x01, 0x30, 0x15, 0x05, 0x22);
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mipi_dbi_command(dbi, DB7430_GATE_INTERFACE,
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0x10, 0x01, 0x00);
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mipi_dbi_command(dbi, DB7430_DISPLAY_H_TIMING,
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0x06, 0x55, 0x03, 0x07, 0x0b,
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0x33, 0x00, 0x01, 0x03);
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/*
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* 0x00 in datasheet 0x01 in vendor code 0x00, it seems 0x01 means
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* DE active high and 0x00 means DE active low.
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*/
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mipi_dbi_command(dbi, DB7430_RGB_SYNC_OPTION, 0x01);
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mipi_dbi_command(dbi, DB7430_GAMMA_SET_RED,
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/* R positive gamma */ 0x00,
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0x0A, 0x31, 0x3B, 0x4E, 0x58, 0x59, 0x5B, 0x58, 0x5E, 0x62,
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0x60, 0x61, 0x5E, 0x62, 0x55, 0x55, 0x7F, 0x08,
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/* R negative gamma */ 0x00,
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0x0A, 0x31, 0x3B, 0x4E, 0x58, 0x59, 0x5B, 0x58, 0x5E, 0x62,
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0x60, 0x61, 0x5E, 0x62, 0x55, 0x55, 0x7F, 0x08);
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mipi_dbi_command(dbi, DB7430_GAMMA_SET_GREEN,
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/* G positive gamma */ 0x00,
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0x25, 0x15, 0x28, 0x3D, 0x4A, 0x48, 0x4C, 0x4A, 0x52, 0x59,
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0x59, 0x5B, 0x56, 0x60, 0x5D, 0x55, 0x7F, 0x0A,
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/* G negative gamma */ 0x00,
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0x25, 0x15, 0x28, 0x3D, 0x4A, 0x48, 0x4C, 0x4A, 0x52, 0x59,
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0x59, 0x5B, 0x56, 0x60, 0x5D, 0x55, 0x7F, 0x0A);
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mipi_dbi_command(dbi, DB7430_GAMMA_SET_BLUE,
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/* B positive gamma */ 0x00,
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0x48, 0x10, 0x1F, 0x2F, 0x35, 0x38, 0x3D, 0x3C, 0x45, 0x4D,
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0x4E, 0x52, 0x51, 0x60, 0x7F, 0x7E, 0x7F, 0x0C,
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/* B negative gamma */ 0x00,
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0x48, 0x10, 0x1F, 0x2F, 0x35, 0x38, 0x3D, 0x3C, 0x45, 0x4D,
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0x4E, 0x52, 0x51, 0x60, 0x7F, 0x7E, 0x7F, 0x0C);
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mipi_dbi_command(dbi, DB7430_BIAS_CURRENT_CTRL, 0x33, 0x13);
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mipi_dbi_command(dbi, DB7430_DDV_CTRL, 0x11, 0x00, 0x00);
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mipi_dbi_command(dbi, DB7430_GAMMA_CTRL_REF, 0x50, 0x50);
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mipi_dbi_command(dbi, DB7430_DCDC_CTRL, 0x2f, 0x11, 0x1e, 0x46);
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mipi_dbi_command(dbi, DB7430_VCL_CTRL, 0x11, 0x0a);
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return 0;
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}
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static int db7430_power_off(struct db7430 *db)
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{
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/* Go into RESET and disable regulators */
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gpiod_set_value_cansleep(db->reset, 1);
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return regulator_bulk_disable(ARRAY_SIZE(db->regulators),
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db->regulators);
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}
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static int db7430_unprepare(struct drm_panel *panel)
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{
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return db7430_power_off(to_db7430(panel));
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}
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static int db7430_disable(struct drm_panel *panel)
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{
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struct db7430 *db = to_db7430(panel);
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struct mipi_dbi *dbi = &db->dbi;
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
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msleep(25);
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mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
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msleep(120);
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return 0;
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}
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static int db7430_prepare(struct drm_panel *panel)
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{
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return db7430_power_on(to_db7430(panel));
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}
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static int db7430_enable(struct drm_panel *panel)
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{
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struct db7430 *db = to_db7430(panel);
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struct mipi_dbi *dbi = &db->dbi;
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/* Exit sleep mode */
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mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
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msleep(20);
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/* NVM (non-volatile memory) load sequence */
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mipi_dbi_command(dbi, DB7430_UNKNOWN_D4, 0x52, 0x5e);
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mipi_dbi_command(dbi, DB7430_UNKNOWN_F8, 0x01, 0xf5, 0xf2, 0x71, 0x44);
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mipi_dbi_command(dbi, DB7430_UNKNOWN_FC, 0x00, 0x08);
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msleep(150);
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/* CABC turn on sequence (BC = backlight control) */
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mipi_dbi_command(dbi, DB7430_UNKNOWN_B4, 0x0f, 0x00, 0x50);
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mipi_dbi_command(dbi, DB7430_USER_SELECT, 0x80);
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mipi_dbi_command(dbi, DB7430_UNKNOWN_B7, 0x24);
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mipi_dbi_command(dbi, DB7430_UNKNOWN_B8, 0x01);
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/* Turn on display */
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mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
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return 0;
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}
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/**
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* db7430_get_modes() - return the mode
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* @panel: the panel to get the mode for
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* @connector: reference to the central DRM connector control structure
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*/
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static int db7430_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct db7430 *db = to_db7430(panel);
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struct drm_display_mode *mode;
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static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
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mode = drm_mode_duplicate(connector->dev, &db7430_480_800_mode);
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if (!mode) {
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dev_err(db->dev, "failed to add mode\n");
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return -ENOMEM;
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}
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connector->display_info.bpc = 8;
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connector->display_info.width_mm = mode->width_mm;
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connector->display_info.height_mm = mode->height_mm;
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connector->display_info.bus_flags =
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DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
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drm_display_info_set_bus_formats(&connector->display_info,
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&bus_format, 1);
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drm_mode_set_name(mode);
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mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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return 1;
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}
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static const struct drm_panel_funcs db7430_drm_funcs = {
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.disable = db7430_disable,
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.unprepare = db7430_unprepare,
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.prepare = db7430_prepare,
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.enable = db7430_enable,
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.get_modes = db7430_get_modes,
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};
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static int db7430_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct db7430 *db;
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int ret;
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db = devm_kzalloc(dev, sizeof(*db), GFP_KERNEL);
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if (!db)
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return -ENOMEM;
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db->dev = dev;
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/*
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* VCI is the analog voltage supply
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* VCCIO is the digital I/O voltage supply
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*/
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db->regulators[0].supply = "vci";
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db->regulators[1].supply = "vccio";
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ret = devm_regulator_bulk_get(dev,
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ARRAY_SIZE(db->regulators),
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db->regulators);
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if (ret)
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return dev_err_probe(dev, ret, "failed to get regulators\n");
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db->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(db->reset)) {
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ret = PTR_ERR(db->reset);
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return dev_err_probe(dev, ret, "no RESET GPIO\n");
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}
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ret = mipi_dbi_spi_init(spi, &db->dbi, NULL);
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if (ret)
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return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
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drm_panel_init(&db->panel, dev, &db7430_drm_funcs,
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DRM_MODE_CONNECTOR_DPI);
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/* FIXME: if no external backlight, use internal backlight */
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ret = drm_panel_of_backlight(&db->panel);
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if (ret)
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return dev_err_probe(dev, ret, "failed to add backlight\n");
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spi_set_drvdata(spi, db);
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drm_panel_add(&db->panel);
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dev_dbg(dev, "added panel\n");
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return 0;
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}
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static void db7430_remove(struct spi_device *spi)
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{
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struct db7430 *db = spi_get_drvdata(spi);
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drm_panel_remove(&db->panel);
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}
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/*
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* The DB7430 display controller may be used in several display products,
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* so list the different variants here and add per-variant data if needed.
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*/
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static const struct of_device_id db7430_match[] = {
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{ .compatible = "samsung,lms397kf04", },
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{},
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};
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MODULE_DEVICE_TABLE(of, db7430_match);
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static const struct spi_device_id db7430_ids[] = {
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{ "lms397kf04" },
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{ },
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};
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MODULE_DEVICE_TABLE(spi, db7430_ids);
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static struct spi_driver db7430_driver = {
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.probe = db7430_probe,
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.remove = db7430_remove,
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.id_table = db7430_ids,
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.driver = {
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.name = "db7430-panel",
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.of_match_table = db7430_match,
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},
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};
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module_spi_driver(db7430_driver);
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MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
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MODULE_DESCRIPTION("Samsung DB7430 panel driver");
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MODULE_LICENSE("GPL v2");
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