AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/gpu/drm/tinydrm/ili9225.c
Noralf Trønnes 9d5645ad1b drm/tinydrm: Use drm_dev_enter/exit() 
This protects device resources from use after device removal.

There are 3 ways for driver-device unbinding to happen:
- The driver module is unloaded causing the driver to be unregistered.
  This can't happen as long as there are open file handles because a
  reference is taken on the module.
- The device is removed (Device Tree overlay unloading).
  This can happen at any time.
- The driver sysfs unbind file can be used to unbind the driver from the
  device. This can happen any time.

v2: Since drm_atomic_helper_shutdown() has to be called after
    drm_dev_unplug() we don't want do block ->disable after unplug.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-8-noralf@tronnes.org
2019-03-04 15:32:21 +01:00

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/*
* DRM driver for Ilitek ILI9225 panels
*
* Copyright 2017 David Lechner <david@lechnology.com>
*
* Some code copied from mipi-dbi.c
* Copyright 2016 Noralf Trønnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/delay.h>
#include <linux/dma-buf.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_rect.h>
#include <drm/drm_vblank.h>
#include <drm/tinydrm/mipi-dbi.h>
#include <drm/tinydrm/tinydrm-helpers.h>
#define ILI9225_DRIVER_READ_CODE 0x00
#define ILI9225_DRIVER_OUTPUT_CONTROL 0x01
#define ILI9225_LCD_AC_DRIVING_CONTROL 0x02
#define ILI9225_ENTRY_MODE 0x03
#define ILI9225_DISPLAY_CONTROL_1 0x07
#define ILI9225_BLANK_PERIOD_CONTROL_1 0x08
#define ILI9225_FRAME_CYCLE_CONTROL 0x0b
#define ILI9225_INTERFACE_CONTROL 0x0c
#define ILI9225_OSCILLATION_CONTROL 0x0f
#define ILI9225_POWER_CONTROL_1 0x10
#define ILI9225_POWER_CONTROL_2 0x11
#define ILI9225_POWER_CONTROL_3 0x12
#define ILI9225_POWER_CONTROL_4 0x13
#define ILI9225_POWER_CONTROL_5 0x14
#define ILI9225_VCI_RECYCLING 0x15
#define ILI9225_RAM_ADDRESS_SET_1 0x20
#define ILI9225_RAM_ADDRESS_SET_2 0x21
#define ILI9225_WRITE_DATA_TO_GRAM 0x22
#define ILI9225_SOFTWARE_RESET 0x28
#define ILI9225_GATE_SCAN_CONTROL 0x30
#define ILI9225_VERTICAL_SCROLL_1 0x31
#define ILI9225_VERTICAL_SCROLL_2 0x32
#define ILI9225_VERTICAL_SCROLL_3 0x33
#define ILI9225_PARTIAL_DRIVING_POS_1 0x34
#define ILI9225_PARTIAL_DRIVING_POS_2 0x35
#define ILI9225_HORIZ_WINDOW_ADDR_1 0x36
#define ILI9225_HORIZ_WINDOW_ADDR_2 0x37
#define ILI9225_VERT_WINDOW_ADDR_1 0x38
#define ILI9225_VERT_WINDOW_ADDR_2 0x39
#define ILI9225_GAMMA_CONTROL_1 0x50
#define ILI9225_GAMMA_CONTROL_2 0x51
#define ILI9225_GAMMA_CONTROL_3 0x52
#define ILI9225_GAMMA_CONTROL_4 0x53
#define ILI9225_GAMMA_CONTROL_5 0x54
#define ILI9225_GAMMA_CONTROL_6 0x55
#define ILI9225_GAMMA_CONTROL_7 0x56
#define ILI9225_GAMMA_CONTROL_8 0x57
#define ILI9225_GAMMA_CONTROL_9 0x58
#define ILI9225_GAMMA_CONTROL_10 0x59
static inline int ili9225_command(struct mipi_dbi *mipi, u8 cmd, u16 data)
{
u8 par[2] = { data >> 8, data & 0xff };
return mipi_dbi_command_buf(mipi, cmd, par, 2);
}
static void ili9225_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)
{
struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
struct mipi_dbi *mipi = drm_to_mipi_dbi(fb->dev);
unsigned int height = rect->y2 - rect->y1;
unsigned int width = rect->x2 - rect->x1;
bool swap = mipi->swap_bytes;
u16 x_start, y_start;
u16 x1, x2, y1, y2;
int idx, ret = 0;
bool full;
void *tr;
if (!mipi->enabled)
return;
if (!drm_dev_enter(fb->dev, &idx))
return;
full = width == fb->width && height == fb->height;
DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
if (!mipi->dc || !full || swap ||
fb->format->format == DRM_FORMAT_XRGB8888) {
tr = mipi->tx_buf;
ret = mipi_dbi_buf_copy(mipi->tx_buf, fb, rect, swap);
if (ret)
goto err_msg;
} else {
tr = cma_obj->vaddr;
}
switch (mipi->rotation) {
default:
x1 = rect->x1;
x2 = rect->x2 - 1;
y1 = rect->y1;
y2 = rect->y2 - 1;
x_start = x1;
y_start = y1;
break;
case 90:
x1 = rect->y1;
x2 = rect->y2 - 1;
y1 = fb->width - rect->x2;
y2 = fb->width - rect->x1 - 1;
x_start = x1;
y_start = y2;
break;
case 180:
x1 = fb->width - rect->x2;
x2 = fb->width - rect->x1 - 1;
y1 = fb->height - rect->y2;
y2 = fb->height - rect->y1 - 1;
x_start = x2;
y_start = y2;
break;
case 270:
x1 = fb->height - rect->y2;
x2 = fb->height - rect->y1 - 1;
y1 = rect->x1;
y2 = rect->x2 - 1;
x_start = x2;
y_start = y1;
break;
}
ili9225_command(mipi, ILI9225_HORIZ_WINDOW_ADDR_1, x2);
ili9225_command(mipi, ILI9225_HORIZ_WINDOW_ADDR_2, x1);
ili9225_command(mipi, ILI9225_VERT_WINDOW_ADDR_1, y2);
ili9225_command(mipi, ILI9225_VERT_WINDOW_ADDR_2, y1);
ili9225_command(mipi, ILI9225_RAM_ADDRESS_SET_1, x_start);
ili9225_command(mipi, ILI9225_RAM_ADDRESS_SET_2, y_start);
ret = mipi_dbi_command_buf(mipi, ILI9225_WRITE_DATA_TO_GRAM, tr,
width * height * 2);
err_msg:
if (ret)
dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret);
drm_dev_exit(idx);
}
static void ili9225_pipe_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state)
{
struct drm_plane_state *state = pipe->plane.state;
struct drm_crtc *crtc = &pipe->crtc;
struct drm_rect rect;
if (drm_atomic_helper_damage_merged(old_state, state, &rect))
ili9225_fb_dirty(state->fb, &rect);
if (crtc->state->event) {
spin_lock_irq(&crtc->dev->event_lock);
drm_crtc_send_vblank_event(crtc, crtc->state->event);
spin_unlock_irq(&crtc->dev->event_lock);
crtc->state->event = NULL;
}
}
static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
struct drm_framebuffer *fb = plane_state->fb;
struct device *dev = pipe->crtc.dev->dev;
struct drm_rect rect = {
.x1 = 0,
.x2 = fb->width,
.y1 = 0,
.y2 = fb->height,
};
int ret, idx;
u8 am_id;
if (!drm_dev_enter(pipe->crtc.dev, &idx))
return;
DRM_DEBUG_KMS("\n");
mipi_dbi_hw_reset(mipi);
/*
* There don't seem to be two example init sequences that match, so
* using the one from the popular Arduino library for this display.
* https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp
*/
ret = ili9225_command(mipi, ILI9225_POWER_CONTROL_1, 0x0000);
if (ret) {
DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
goto out_exit;
}
ili9225_command(mipi, ILI9225_POWER_CONTROL_2, 0x0000);
ili9225_command(mipi, ILI9225_POWER_CONTROL_3, 0x0000);
ili9225_command(mipi, ILI9225_POWER_CONTROL_4, 0x0000);
ili9225_command(mipi, ILI9225_POWER_CONTROL_5, 0x0000);
msleep(40);
ili9225_command(mipi, ILI9225_POWER_CONTROL_2, 0x0018);
ili9225_command(mipi, ILI9225_POWER_CONTROL_3, 0x6121);
ili9225_command(mipi, ILI9225_POWER_CONTROL_4, 0x006f);
ili9225_command(mipi, ILI9225_POWER_CONTROL_5, 0x495f);
ili9225_command(mipi, ILI9225_POWER_CONTROL_1, 0x0800);
msleep(10);
ili9225_command(mipi, ILI9225_POWER_CONTROL_2, 0x103b);
msleep(50);
switch (mipi->rotation) {
default:
am_id = 0x30;
break;
case 90:
am_id = 0x18;
break;
case 180:
am_id = 0x00;
break;
case 270:
am_id = 0x28;
break;
}
ili9225_command(mipi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c);
ili9225_command(mipi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100);
ili9225_command(mipi, ILI9225_ENTRY_MODE, 0x1000 | am_id);
ili9225_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
ili9225_command(mipi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808);
ili9225_command(mipi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100);
ili9225_command(mipi, ILI9225_INTERFACE_CONTROL, 0x0000);
ili9225_command(mipi, ILI9225_OSCILLATION_CONTROL, 0x0d01);
ili9225_command(mipi, ILI9225_VCI_RECYCLING, 0x0020);
ili9225_command(mipi, ILI9225_RAM_ADDRESS_SET_1, 0x0000);
ili9225_command(mipi, ILI9225_RAM_ADDRESS_SET_2, 0x0000);
ili9225_command(mipi, ILI9225_GATE_SCAN_CONTROL, 0x0000);
ili9225_command(mipi, ILI9225_VERTICAL_SCROLL_1, 0x00db);
ili9225_command(mipi, ILI9225_VERTICAL_SCROLL_2, 0x0000);
ili9225_command(mipi, ILI9225_VERTICAL_SCROLL_3, 0x0000);
ili9225_command(mipi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db);
ili9225_command(mipi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_1, 0x0000);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_2, 0x0808);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_3, 0x080a);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_4, 0x000a);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_5, 0x0a08);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_6, 0x0808);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_7, 0x0000);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_8, 0x0a00);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_9, 0x0710);
ili9225_command(mipi, ILI9225_GAMMA_CONTROL_10, 0x0710);
ili9225_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x0012);
msleep(50);
ili9225_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
mipi->enabled = true;
ili9225_fb_dirty(fb, &rect);
out_exit:
drm_dev_exit(idx);
}
static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
{
struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
DRM_DEBUG_KMS("\n");
/*
* This callback is not protected by drm_dev_enter/exit since we want to
* turn off the display on regular driver unload. It's highly unlikely
* that the underlying SPI controller is gone should this be called after
* unplug.
*/
if (!mipi->enabled)
return;
ili9225_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
msleep(50);
ili9225_command(mipi, ILI9225_POWER_CONTROL_2, 0x0007);
msleep(50);
ili9225_command(mipi, ILI9225_POWER_CONTROL_1, 0x0a02);
mipi->enabled = false;
}
static int ili9225_dbi_command(struct mipi_dbi *mipi, u8 cmd, u8 *par,
size_t num)
{
struct spi_device *spi = mipi->spi;
unsigned int bpw = 8;
u32 speed_hz;
int ret;
gpiod_set_value_cansleep(mipi->dc, 0);
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
ret = tinydrm_spi_transfer(spi, speed_hz, NULL, 8, &cmd, 1);
if (ret || !num)
return ret;
if (cmd == ILI9225_WRITE_DATA_TO_GRAM && !mipi->swap_bytes)
bpw = 16;
gpiod_set_value_cansleep(mipi->dc, 1);
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
return tinydrm_spi_transfer(spi, speed_hz, NULL, bpw, par, num);
}
static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = {
.enable = ili9225_pipe_enable,
.disable = ili9225_pipe_disable,
.update = ili9225_pipe_update,
.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
};
static const struct drm_display_mode ili9225_mode = {
DRM_SIMPLE_MODE(176, 220, 35, 44),
};
DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops);
static struct drm_driver ili9225_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
DRIVER_ATOMIC,
.fops = &ili9225_fops,
.release = mipi_dbi_release,
DRM_GEM_CMA_VMAP_DRIVER_OPS,
.name = "ili9225",
.desc = "Ilitek ILI9225",
.date = "20171106",
.major = 1,
.minor = 0,
};
static const struct of_device_id ili9225_of_match[] = {
{ .compatible = "vot,v220hf01a-t" },
{},
};
MODULE_DEVICE_TABLE(of, ili9225_of_match);
static const struct spi_device_id ili9225_id[] = {
{ "v220hf01a-t", 0 },
{ },
};
MODULE_DEVICE_TABLE(spi, ili9225_id);
static int ili9225_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct drm_device *drm;
struct mipi_dbi *mipi;
struct gpio_desc *rs;
u32 rotation = 0;
int ret;
mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
if (!mipi)
return -ENOMEM;
drm = &mipi->drm;
ret = devm_drm_dev_init(dev, drm, &ili9225_driver);
if (ret) {
kfree(mipi);
return ret;
}
drm_mode_config_init(drm);
mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(mipi->reset)) {
DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
return PTR_ERR(mipi->reset);
}
rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
if (IS_ERR(rs)) {
DRM_DEV_ERROR(dev, "Failed to get gpio 'rs'\n");
return PTR_ERR(rs);
}
device_property_read_u32(dev, "rotation", &rotation);
ret = mipi_dbi_spi_init(spi, mipi, rs);
if (ret)
return ret;
/* override the command function set in mipi_dbi_spi_init() */
mipi->command = ili9225_dbi_command;
ret = mipi_dbi_init(mipi, &ili9225_pipe_funcs, &ili9225_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, 32);
return 0;
}
static int ili9225_remove(struct spi_device *spi)
{
struct drm_device *drm = spi_get_drvdata(spi);
drm_dev_unplug(drm);
drm_atomic_helper_shutdown(drm);
return 0;
}
static void ili9225_shutdown(struct spi_device *spi)
{
drm_atomic_helper_shutdown(spi_get_drvdata(spi));
}
static struct spi_driver ili9225_spi_driver = {
.driver = {
.name = "ili9225",
.owner = THIS_MODULE,
.of_match_table = ili9225_of_match,
},
.id_table = ili9225_id,
.probe = ili9225_probe,
.remove = ili9225_remove,
.shutdown = ili9225_shutdown,
};
module_spi_driver(ili9225_spi_driver);
MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_LICENSE("GPL");
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