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linux/drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
Uwe Kleine-König a0386bba70
spi: make remove callback a void function 
The value returned by an spi driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Claudius Heine <ch@denx.de>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Acked-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Acked-by: Łukasz Stelmach <l.stelmach@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220123175201.34839-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-02-09 13:00:45 +00:00

393 lines
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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);
return jbt_ret_write_0(lcd, JBT_REG_DISPLAY_ON, NULL);
}
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 void 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);
}
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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