drm/tinydrm: Add MIPI DBI support
Add support for MIPI DBI compatible controllers. Interface type C option 1 and 3 are supported (SPI). Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Acked-by: Thierry Reding <treding@nvidia.com>hifive-unleashed-5.1
Noralf Trønnes
parent
9f69eb5c36
commit
02dd95fe31
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@ -28,3 +28,15 @@ Additional helpers
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.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
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:export:
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MIPI DBI Compatible Controllers
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===============================
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.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c
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:doc: overview
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.. kernel-doc:: include/drm/tinydrm/mipi-dbi.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c
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:export:
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@ -8,3 +8,6 @@ menuconfig DRM_TINYDRM
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help
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Choose this option if you have a tinydrm supported display.
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If M is selected the module will be called tinydrm.
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config TINYDRM_MIPI_DBI
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tristate
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@ -1 +1,4 @@
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obj-$(CONFIG_DRM_TINYDRM) += core/
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# Controllers
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obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,107 @@
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/*
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* MIPI Display Bus Interface (DBI) LCD controller support
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*
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* Copyright 2016 Noralf Trønnes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __LINUX_MIPI_DBI_H
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#define __LINUX_MIPI_DBI_H
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#include <drm/tinydrm/tinydrm.h>
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struct spi_device;
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struct gpio_desc;
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struct regulator;
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/**
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* struct mipi_dbi - MIPI DBI controller
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* @tinydrm: tinydrm base
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* @spi: SPI device
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* @enabled: Pipeline is enabled
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* @cmdlock: Command lock
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* @command: Bus specific callback executing commands.
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* @read_commands: Array of read commands terminated by a zero entry.
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* Reading is disabled if this is NULL.
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* @dc: Optional D/C gpio.
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* @tx_buf: Buffer used for transfer (copy clip rect area)
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* @tx_buf9: Buffer used for Option 1 9-bit conversion
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* @tx_buf9_len: Size of tx_buf9.
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* @swap_bytes: Swap bytes in buffer before transfer
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* @reset: Optional reset gpio
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* @rotation: initial rotation in degrees Counter Clock Wise
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* @backlight: backlight device (optional)
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* @regulator: power regulator (optional)
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*/
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struct mipi_dbi {
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struct tinydrm_device tinydrm;
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struct spi_device *spi;
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bool enabled;
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struct mutex cmdlock;
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int (*command)(struct mipi_dbi *mipi, u8 cmd, u8 *param, size_t num);
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const u8 *read_commands;
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struct gpio_desc *dc;
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u16 *tx_buf;
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void *tx_buf9;
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size_t tx_buf9_len;
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bool swap_bytes;
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struct gpio_desc *reset;
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unsigned int rotation;
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struct backlight_device *backlight;
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struct regulator *regulator;
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};
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static inline struct mipi_dbi *
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mipi_dbi_from_tinydrm(struct tinydrm_device *tdev)
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{
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return container_of(tdev, struct mipi_dbi, tinydrm);
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}
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int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
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struct gpio_desc *dc,
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const struct drm_simple_display_pipe_funcs *pipe_funcs,
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struct drm_driver *driver,
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const struct drm_display_mode *mode,
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unsigned int rotation);
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int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
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const struct drm_simple_display_pipe_funcs *pipe_funcs,
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struct drm_driver *driver,
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const struct drm_display_mode *mode, unsigned int rotation);
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void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
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struct drm_crtc_state *crtc_state);
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void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
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void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
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bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);
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int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);
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int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);
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/**
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* mipi_dbi_command - MIPI DCS command with optional parameter(s)
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* @mipi: MIPI structure
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* @cmd: Command
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* @seq...: Optional parameter(s)
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*
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* Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
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* get/read.
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*
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* Returns:
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* Zero on success, negative error code on failure.
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*/
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#define mipi_dbi_command(mipi, cmd, seq...) \
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({ \
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u8 d[] = { seq }; \
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mipi_dbi_command_buf(mipi, cmd, d, ARRAY_SIZE(d)); \
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})
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#ifdef CONFIG_DEBUG_FS
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int mipi_dbi_debugfs_init(struct drm_minor *minor);
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#else
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#define mipi_dbi_debugfs_init NULL
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#endif
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#endif /* __LINUX_MIPI_DBI_H */
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