linux/include/drm/drm_mipi_dbi.h
Geert Uytterhoeven f41a8a6989 drm/mipi_dbi: Add support for display offsets
If the resolution of the TFT display is smaller than the maximum
resolution supported by the display controller, the display may be
connected to the driver output arrays with a horizontal and/or vertical
offset, leading to a shifted image.

Add support for specifying these offsets.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200115124548.3951-4-geert+renesas@glider.be
2020-01-19 18:07:08 +01:00

201 lines
4.6 KiB
C

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* MIPI Display Bus Interface (DBI) LCD controller support
*
* Copyright 2016 Noralf Trønnes
*/
#ifndef __LINUX_MIPI_DBI_H
#define __LINUX_MIPI_DBI_H
#include <linux/mutex.h>
#include <drm/drm_device.h>
#include <drm/drm_simple_kms_helper.h>
struct drm_rect;
struct spi_device;
struct gpio_desc;
struct regulator;
/**
* struct mipi_dbi - MIPI DBI interface
*/
struct mipi_dbi {
/**
* @cmdlock: Command lock
*/
struct mutex cmdlock;
/**
* @command: Bus specific callback executing commands.
*/
int (*command)(struct mipi_dbi *dbi, u8 *cmd, u8 *param, size_t num);
/**
* @read_commands: Array of read commands terminated by a zero entry.
* Reading is disabled if this is NULL.
*/
const u8 *read_commands;
/**
* @swap_bytes: Swap bytes in buffer before transfer
*/
bool swap_bytes;
/**
* @reset: Optional reset gpio
*/
struct gpio_desc *reset;
/* Type C specific */
/**
* @spi: SPI device
*/
struct spi_device *spi;
/**
* @dc: Optional D/C gpio.
*/
struct gpio_desc *dc;
/**
* @tx_buf9: Buffer used for Option 1 9-bit conversion
*/
void *tx_buf9;
/**
* @tx_buf9_len: Size of tx_buf9.
*/
size_t tx_buf9_len;
};
/**
* struct mipi_dbi_dev - MIPI DBI device
*/
struct mipi_dbi_dev {
/**
* @drm: DRM device
*/
struct drm_device drm;
/**
* @pipe: Display pipe structure
*/
struct drm_simple_display_pipe pipe;
/**
* @connector: Connector
*/
struct drm_connector connector;
/**
* @mode: Fixed display mode
*/
struct drm_display_mode mode;
/**
* @enabled: Pipeline is enabled
*/
bool enabled;
/**
* @tx_buf: Buffer used for transfer (copy clip rect area)
*/
u16 *tx_buf;
/**
* @rotation: initial rotation in degrees Counter Clock Wise
*/
unsigned int rotation;
/**
* @left_offset: Horizontal offset of the display relative to the
* controller's driver array
*/
unsigned int left_offset;
/**
* @top_offset: Vertical offset of the display relative to the
* controller's driver array
*/
unsigned int top_offset;
/**
* @backlight: backlight device (optional)
*/
struct backlight_device *backlight;
/**
* @regulator: power regulator (optional)
*/
struct regulator *regulator;
/**
* @dbi: MIPI DBI interface
*/
struct mipi_dbi dbi;
};
static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)
{
return container_of(drm, struct mipi_dbi_dev, drm);
}
int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
struct gpio_desc *dc);
int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev,
const struct drm_simple_display_pipe_funcs *funcs,
const uint32_t *formats, unsigned int format_count,
const struct drm_display_mode *mode,
unsigned int rotation, size_t tx_buf_size);
int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev,
const struct drm_simple_display_pipe_funcs *funcs,
const struct drm_display_mode *mode, unsigned int rotation);
void mipi_dbi_release(struct drm_device *drm);
void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state);
void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plan_state);
void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
void mipi_dbi_hw_reset(struct mipi_dbi *dbi);
bool mipi_dbi_display_is_on(struct mipi_dbi *dbi);
int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev);
int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev);
u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz,
u8 bpw, const void *buf, size_t len);
int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val);
int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
struct drm_rect *clip, bool swap);
/**
* mipi_dbi_command - MIPI DCS command with optional parameter(s)
* @dbi: MIPI DBI structure
* @cmd: Command
* @seq...: Optional parameter(s)
*
* Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
* get/read.
*
* Returns:
* Zero on success, negative error code on failure.
*/
#define mipi_dbi_command(dbi, cmd, seq...) \
({ \
u8 d[] = { seq }; \
mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \
})
#ifdef CONFIG_DEBUG_FS
int mipi_dbi_debugfs_init(struct drm_minor *minor);
#else
#define mipi_dbi_debugfs_init NULL
#endif
#endif /* __LINUX_MIPI_DBI_H */