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linux_dsm_epyc7002/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
Bernard Zhao c3ee8c65f6 drm/panel: remove return value of function drm_panel_add 
The function "int drm_panel_add(struct drm_panel *panel)"
always returns 0, this return value is meaningless.
Also, there is no need to check return value which calls
"drm_panel_add and", error branch code will never run.

Signed-off-by: Bernard Zhao <bernard@vivo.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200801120216.8488-1-bernard@vivo.com
2020-08-02 08:59:06 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Toppoly TD028TTEC1 Panel Driver
*
* Copyright (C) 2019 Texas Instruments Incorporated
*
* Based on the omapdrm-specific panel-tpo-td028ttec1 driver
*
* Copyright (C) 2008 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
*
* Neo 1973 code (jbt6k74.c):
* Copyright (C) 2006-2007 OpenMoko, Inc.
* Author: Harald Welte <laforge@openmoko.org>
*
* Ported and adapted from Neo 1973 U-Boot by:
* H. Nikolaus Schaller <hns@goldelico.com>
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <drm/drm_connector.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#define JBT_COMMAND 0x000
#define JBT_DATA 0x100
#define JBT_REG_SLEEP_IN 0x10
#define JBT_REG_SLEEP_OUT 0x11
#define JBT_REG_DISPLAY_OFF 0x28
#define JBT_REG_DISPLAY_ON 0x29
#define JBT_REG_RGB_FORMAT 0x3a
#define JBT_REG_QUAD_RATE 0x3b
#define JBT_REG_POWER_ON_OFF 0xb0
#define JBT_REG_BOOSTER_OP 0xb1
#define JBT_REG_BOOSTER_MODE 0xb2
#define JBT_REG_BOOSTER_FREQ 0xb3
#define JBT_REG_OPAMP_SYSCLK 0xb4
#define JBT_REG_VSC_VOLTAGE 0xb5
#define JBT_REG_VCOM_VOLTAGE 0xb6
#define JBT_REG_EXT_DISPL 0xb7
#define JBT_REG_OUTPUT_CONTROL 0xb8
#define JBT_REG_DCCLK_DCEV 0xb9
#define JBT_REG_DISPLAY_MODE1 0xba
#define JBT_REG_DISPLAY_MODE2 0xbb
#define JBT_REG_DISPLAY_MODE 0xbc
#define JBT_REG_ASW_SLEW 0xbd
#define JBT_REG_DUMMY_DISPLAY 0xbe
#define JBT_REG_DRIVE_SYSTEM 0xbf
#define JBT_REG_SLEEP_OUT_FR_A 0xc0
#define JBT_REG_SLEEP_OUT_FR_B 0xc1
#define JBT_REG_SLEEP_OUT_FR_C 0xc2
#define JBT_REG_SLEEP_IN_LCCNT_D 0xc3
#define JBT_REG_SLEEP_IN_LCCNT_E 0xc4
#define JBT_REG_SLEEP_IN_LCCNT_F 0xc5
#define JBT_REG_SLEEP_IN_LCCNT_G 0xc6
#define JBT_REG_GAMMA1_FINE_1 0xc7
#define JBT_REG_GAMMA1_FINE_2 0xc8
#define JBT_REG_GAMMA1_INCLINATION 0xc9
#define JBT_REG_GAMMA1_BLUE_OFFSET 0xca
#define JBT_REG_BLANK_CONTROL 0xcf
#define JBT_REG_BLANK_TH_TV 0xd0
#define JBT_REG_CKV_ON_OFF 0xd1
#define JBT_REG_CKV_1_2 0xd2
#define JBT_REG_OEV_TIMING 0xd3
#define JBT_REG_ASW_TIMING_1 0xd4
#define JBT_REG_ASW_TIMING_2 0xd5
#define JBT_REG_HCLOCK_VGA 0xec
#define JBT_REG_HCLOCK_QVGA 0xed
struct td028ttec1_panel {
struct drm_panel panel;
struct spi_device *spi;
};
#define to_td028ttec1_device(p) container_of(p, struct td028ttec1_panel, panel)
/*
* noinline_for_stack so we don't get multiple copies of tx_buf
* on the stack in case of gcc-plugin-structleak
*/
static int noinline_for_stack
jbt_ret_write_0(struct td028ttec1_panel *lcd, u8 reg, int *err)
{
struct spi_device *spi = lcd->spi;
u16 tx_buf = JBT_COMMAND | reg;
int ret;
if (err && *err)
return *err;
ret = spi_write(spi, (u8 *)&tx_buf, sizeof(tx_buf));
if (ret < 0) {
dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret);
if (err)
*err = ret;
}
return ret;
}
static int noinline_for_stack
jbt_reg_write_1(struct td028ttec1_panel *lcd,
u8 reg, u8 data, int *err)
{
struct spi_device *spi = lcd->spi;
u16 tx_buf[2];
int ret;
if (err && *err)
return *err;
tx_buf[0] = JBT_COMMAND | reg;
tx_buf[1] = JBT_DATA | data;
ret = spi_write(spi, (u8 *)tx_buf, sizeof(tx_buf));
if (ret < 0) {
dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret);
if (err)
*err = ret;
}
return ret;
}
static int noinline_for_stack
jbt_reg_write_2(struct td028ttec1_panel *lcd,
u8 reg, u16 data, int *err)
{
struct spi_device *spi = lcd->spi;
u16 tx_buf[3];
int ret;
if (err && *err)
return *err;
tx_buf[0] = JBT_COMMAND | reg;
tx_buf[1] = JBT_DATA | (data >> 8);
tx_buf[2] = JBT_DATA | (data & 0xff);
ret = spi_write(spi, (u8 *)tx_buf, sizeof(tx_buf));
if (ret < 0) {
dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret);
if (err)
*err = ret;
}
return ret;
}
static int td028ttec1_prepare(struct drm_panel *panel)
{
struct td028ttec1_panel *lcd = to_td028ttec1_device(panel);
unsigned int i;
int ret = 0;
/* Three times command zero */
for (i = 0; i < 3; ++i) {
jbt_ret_write_0(lcd, 0x00, &ret);
usleep_range(1000, 2000);
}
/* deep standby out */
jbt_reg_write_1(lcd, JBT_REG_POWER_ON_OFF, 0x17, &ret);
/* RGB I/F on, RAM write off, QVGA through, SIGCON enable */
jbt_reg_write_1(lcd, JBT_REG_DISPLAY_MODE, 0x80, &ret);
/* Quad mode off */
jbt_reg_write_1(lcd, JBT_REG_QUAD_RATE, 0x00, &ret);
/* AVDD on, XVDD on */
jbt_reg_write_1(lcd, JBT_REG_POWER_ON_OFF, 0x16, &ret);
/* Output control */
jbt_reg_write_2(lcd, JBT_REG_OUTPUT_CONTROL, 0xfff9, &ret);
/* Sleep mode off */
jbt_ret_write_0(lcd, JBT_REG_SLEEP_OUT, &ret);
/* at this point we have like 50% grey */
/* initialize register set */
jbt_reg_write_1(lcd, JBT_REG_DISPLAY_MODE1, 0x01, &ret);
jbt_reg_write_1(lcd, JBT_REG_DISPLAY_MODE2, 0x00, &ret);
jbt_reg_write_1(lcd, JBT_REG_RGB_FORMAT, 0x60, &ret);
jbt_reg_write_1(lcd, JBT_REG_DRIVE_SYSTEM, 0x10, &ret);
jbt_reg_write_1(lcd, JBT_REG_BOOSTER_OP, 0x56, &ret);
jbt_reg_write_1(lcd, JBT_REG_BOOSTER_MODE, 0x33, &ret);
jbt_reg_write_1(lcd, JBT_REG_BOOSTER_FREQ, 0x11, &ret);
jbt_reg_write_1(lcd, JBT_REG_BOOSTER_FREQ, 0x11, &ret);
jbt_reg_write_1(lcd, JBT_REG_OPAMP_SYSCLK, 0x02, &ret);
jbt_reg_write_1(lcd, JBT_REG_VSC_VOLTAGE, 0x2b, &ret);
jbt_reg_write_1(lcd, JBT_REG_VCOM_VOLTAGE, 0x40, &ret);
jbt_reg_write_1(lcd, JBT_REG_EXT_DISPL, 0x03, &ret);
jbt_reg_write_1(lcd, JBT_REG_DCCLK_DCEV, 0x04, &ret);
/*
* default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
* to avoid red / blue flicker
*/
jbt_reg_write_1(lcd, JBT_REG_ASW_SLEW, 0x04, &ret);
jbt_reg_write_1(lcd, JBT_REG_DUMMY_DISPLAY, 0x00, &ret);
jbt_reg_write_1(lcd, JBT_REG_SLEEP_OUT_FR_A, 0x11, &ret);
jbt_reg_write_1(lcd, JBT_REG_SLEEP_OUT_FR_B, 0x11, &ret);
jbt_reg_write_1(lcd, JBT_REG_SLEEP_OUT_FR_C, 0x11, &ret);
jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040, &ret);
jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0, &ret);
jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020, &ret);
jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0, &ret);
jbt_reg_write_2(lcd, JBT_REG_GAMMA1_FINE_1, 0x5533, &ret);
jbt_reg_write_1(lcd, JBT_REG_GAMMA1_FINE_2, 0x00, &ret);
jbt_reg_write_1(lcd, JBT_REG_GAMMA1_INCLINATION, 0x00, &ret);
jbt_reg_write_1(lcd, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00, &ret);
jbt_reg_write_2(lcd, JBT_REG_HCLOCK_VGA, 0x1f0, &ret);
jbt_reg_write_1(lcd, JBT_REG_BLANK_CONTROL, 0x02, &ret);
jbt_reg_write_2(lcd, JBT_REG_BLANK_TH_TV, 0x0804, &ret);
jbt_reg_write_1(lcd, JBT_REG_CKV_ON_OFF, 0x01, &ret);
jbt_reg_write_2(lcd, JBT_REG_CKV_1_2, 0x0000, &ret);
jbt_reg_write_2(lcd, JBT_REG_OEV_TIMING, 0x0d0e, &ret);
jbt_reg_write_2(lcd, JBT_REG_ASW_TIMING_1, 0x11a4, &ret);
jbt_reg_write_1(lcd, JBT_REG_ASW_TIMING_2, 0x0e, &ret);
return ret;
}
static int td028ttec1_enable(struct drm_panel *panel)
{
struct td028ttec1_panel *lcd = to_td028ttec1_device(panel);
int ret;
ret = jbt_ret_write_0(lcd, JBT_REG_DISPLAY_ON, NULL);
if (ret)
return ret;
return 0;
}
static int td028ttec1_disable(struct drm_panel *panel)
{
struct td028ttec1_panel *lcd = to_td028ttec1_device(panel);
jbt_ret_write_0(lcd, JBT_REG_DISPLAY_OFF, NULL);
return 0;
}
static int td028ttec1_unprepare(struct drm_panel *panel)
{
struct td028ttec1_panel *lcd = to_td028ttec1_device(panel);
jbt_reg_write_2(lcd, JBT_REG_OUTPUT_CONTROL, 0x8002, NULL);
jbt_ret_write_0(lcd, JBT_REG_SLEEP_IN, NULL);
jbt_reg_write_1(lcd, JBT_REG_POWER_ON_OFF, 0x00, NULL);
return 0;
}
static const struct drm_display_mode td028ttec1_mode = {
.clock = 22153,
.hdisplay = 480,
.hsync_start = 480 + 24,
.hsync_end = 480 + 24 + 8,
.htotal = 480 + 24 + 8 + 8,
.vdisplay = 640,
.vsync_start = 640 + 4,
.vsync_end = 640 + 4 + 2,
.vtotal = 640 + 4 + 2 + 2,
.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
.width_mm = 43,
.height_mm = 58,
};
static int td028ttec1_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &td028ttec1_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
connector->display_info.width_mm = td028ttec1_mode.width_mm;
connector->display_info.height_mm = td028ttec1_mode.height_mm;
/*
* FIXME: According to the datasheet sync signals are sampled on the
* rising edge of the clock, but the code running on the OpenMoko Neo
* FreeRunner and Neo 1973 indicates sampling on the falling edge. This
* should be tested on a real device.
*/
connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
| DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
| DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE;
return 1;
}
static const struct drm_panel_funcs td028ttec1_funcs = {
.prepare = td028ttec1_prepare,
.enable = td028ttec1_enable,
.disable = td028ttec1_disable,
.unprepare = td028ttec1_unprepare,
.get_modes = td028ttec1_get_modes,
};
static int td028ttec1_probe(struct spi_device *spi)
{
struct td028ttec1_panel *lcd;
int ret;
lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
spi_set_drvdata(spi, lcd);
lcd->spi = spi;
spi->mode = SPI_MODE_3;
spi->bits_per_word = 9;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
return ret;
}
drm_panel_init(&lcd->panel, &lcd->spi->dev, &td028ttec1_funcs,
DRM_MODE_CONNECTOR_DPI);
ret = drm_panel_of_backlight(&lcd->panel);
if (ret)
return ret;
drm_panel_add(&lcd->panel);
return 0;
}
static int td028ttec1_remove(struct spi_device *spi)
{
struct td028ttec1_panel *lcd = spi_get_drvdata(spi);
drm_panel_remove(&lcd->panel);
drm_panel_disable(&lcd->panel);
drm_panel_unprepare(&lcd->panel);
return 0;
}
static const struct of_device_id td028ttec1_of_match[] = {
{ .compatible = "tpo,td028ttec1", },
/* DT backward compatibility. */
{ .compatible = "toppoly,td028ttec1", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, td028ttec1_of_match);
static const struct spi_device_id td028ttec1_ids[] = {
{ "td028ttec1", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, td028ttec1_ids);
static struct spi_driver td028ttec1_driver = {
.probe = td028ttec1_probe,
.remove = td028ttec1_remove,
.id_table = td028ttec1_ids,
.driver = {
.name = "panel-tpo-td028ttec1",
.of_match_table = td028ttec1_of_match,
},
};
module_spi_driver(td028ttec1_driver);
MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
MODULE_DESCRIPTION("Toppoly TD028TTEC1 panel driver");
MODULE_LICENSE("GPL");
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