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linux/drivers/gpu/drm/tiny/ili9225.c
Daniel Vetter 7e06886bbf drm/mipi-dbi: Remove ->enabled 
The atomic helpers try really hard to not lose track of things,
duplicating enabled tracking in the driver is at best confusing.
Double-enabling or disabling is a bug in atomic helpers.

In the fb_dirty function we can just assume that the fb always exists,
simple display pipe helpers guarantee that the crtc is only enabled
together with the output, so we always have a primary plane around.

Now in the update function we need to be a notch more careful, since
that can also get called when the crtc is off. And we don't want to
upload frames when that's the case, so filter that out too.

Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: David Lechner <david@lechnology.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200612160056.2082681-7-daniel.vetter@ffwll.ch
2020-06-24 09:17:34 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DRM driver for Ilitek ILI9225 panels
*
* Copyright 2017 David Lechner <david@lechnology.com>
*
* Some code copied from mipi-dbi.c
* Copyright 2016 Noralf Trønnes
*/
#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_managed.h>
#include <drm/drm_mipi_dbi.h>
#include <drm/drm_rect.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 *dbi, u8 cmd, u16 data)
{
u8 par[2] = { data >> 8, data & 0xff };
return mipi_dbi_command_buf(dbi, 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_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev);
unsigned int height = rect->y2 - rect->y1;
unsigned int width = rect->x2 - rect->x1;
struct mipi_dbi *dbi = &dbidev->dbi;
bool swap = dbi->swap_bytes;
u16 x_start, y_start;
u16 x1, x2, y1, y2;
int idx, ret = 0;
bool full;
void *tr;
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 (!dbi->dc || !full || swap ||
fb->format->format == DRM_FORMAT_XRGB8888) {
tr = dbidev->tx_buf;
ret = mipi_dbi_buf_copy(dbidev->tx_buf, fb, rect, swap);
if (ret)
goto err_msg;
} else {
tr = cma_obj->vaddr;
}
switch (dbidev->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(dbi, ILI9225_HORIZ_WINDOW_ADDR_1, x2);
ili9225_command(dbi, ILI9225_HORIZ_WINDOW_ADDR_2, x1);
ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_1, y2);
ili9225_command(dbi, ILI9225_VERT_WINDOW_ADDR_2, y1);
ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, x_start);
ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, y_start);
ret = mipi_dbi_command_buf(dbi, 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_rect rect;
if (!pipe->crtc.state->active)
return;
if (drm_atomic_helper_damage_merged(old_state, state, &rect))
ili9225_fb_dirty(state->fb, &rect);
}
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_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
struct drm_framebuffer *fb = plane_state->fb;
struct device *dev = pipe->crtc.dev->dev;
struct mipi_dbi *dbi = &dbidev->dbi;
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(dbi);
/*
* 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(dbi, ILI9225_POWER_CONTROL_1, 0x0000);
if (ret) {
DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
goto out_exit;
}
ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0000);
ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x0000);
ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x0000);
ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x0000);
msleep(40);
ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0018);
ili9225_command(dbi, ILI9225_POWER_CONTROL_3, 0x6121);
ili9225_command(dbi, ILI9225_POWER_CONTROL_4, 0x006f);
ili9225_command(dbi, ILI9225_POWER_CONTROL_5, 0x495f);
ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0800);
msleep(10);
ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x103b);
msleep(50);
switch (dbidev->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(dbi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x011c);
ili9225_command(dbi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x0100);
ili9225_command(dbi, ILI9225_ENTRY_MODE, 0x1000 | am_id);
ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
ili9225_command(dbi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x0808);
ili9225_command(dbi, ILI9225_FRAME_CYCLE_CONTROL, 0x1100);
ili9225_command(dbi, ILI9225_INTERFACE_CONTROL, 0x0000);
ili9225_command(dbi, ILI9225_OSCILLATION_CONTROL, 0x0d01);
ili9225_command(dbi, ILI9225_VCI_RECYCLING, 0x0020);
ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_1, 0x0000);
ili9225_command(dbi, ILI9225_RAM_ADDRESS_SET_2, 0x0000);
ili9225_command(dbi, ILI9225_GATE_SCAN_CONTROL, 0x0000);
ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_1, 0x00db);
ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_2, 0x0000);
ili9225_command(dbi, ILI9225_VERTICAL_SCROLL_3, 0x0000);
ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00db);
ili9225_command(dbi, ILI9225_PARTIAL_DRIVING_POS_2, 0x0000);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_1, 0x0000);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_2, 0x0808);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_3, 0x080a);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_4, 0x000a);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_5, 0x0a08);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_6, 0x0808);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_7, 0x0000);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_8, 0x0a00);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_9, 0x0710);
ili9225_command(dbi, ILI9225_GAMMA_CONTROL_10, 0x0710);
ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0012);
msleep(50);
ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x1017);
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_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
struct mipi_dbi *dbi = &dbidev->dbi;
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.
*/
ili9225_command(dbi, ILI9225_DISPLAY_CONTROL_1, 0x0000);
msleep(50);
ili9225_command(dbi, ILI9225_POWER_CONTROL_2, 0x0007);
msleep(50);
ili9225_command(dbi, ILI9225_POWER_CONTROL_1, 0x0a02);
}
static int ili9225_dbi_command(struct mipi_dbi *dbi, u8 *cmd, u8 *par,
size_t num)
{
struct spi_device *spi = dbi->spi;
unsigned int bpw = 8;
u32 speed_hz;
int ret;
gpiod_set_value_cansleep(dbi->dc, 0);
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, cmd, 1);
if (ret || !num)
return ret;
if (*cmd == ILI9225_WRITE_DATA_TO_GRAM && !dbi->swap_bytes)
bpw = 16;
gpiod_set_value_cansleep(dbi->dc, 1);
speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
return mipi_dbi_spi_transfer(spi, speed_hz, 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_ATOMIC,
.fops = &ili9225_fops,
DRM_GEM_CMA_DRIVER_OPS_VMAP,
.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 mipi_dbi_dev *dbidev;
struct drm_device *drm;
struct mipi_dbi *dbi;
struct gpio_desc *rs;
u32 rotation = 0;
int ret;
dbidev = devm_drm_dev_alloc(dev, &ili9225_driver,
struct mipi_dbi_dev, drm);
if (IS_ERR(dbidev))
return PTR_ERR(dbidev);
dbi = &dbidev->dbi;
drm = &dbidev->drm;
dbi->reset = devm_gpiod_get(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);
}
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, dbi, rs);
if (ret)
return ret;
/* override the command function set in mipi_dbi_spi_init() */
dbi->command = ili9225_dbi_command;
ret = mipi_dbi_dev_init(dbidev, &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, 0);
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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