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Commit 02dd95fe authored by Noralf Trønnes's avatar Noralf Trønnes
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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: default avatarNoralf Trønnes <noralf@tronnes.org>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
parent 9f69eb5c

Documentation/gpu/tinydrm.rst

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@@ -28,3 +28,15 @@ Additional helpers 


.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c

   :export:



MIPI DBI Compatible Controllers

===============================



.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c

   :doc: overview



.. kernel-doc:: include/drm/tinydrm/mipi-dbi.h

   :internal:



.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c

   :export:

drivers/gpu/drm/tinydrm/Kconfig

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@@ -8,3 +8,6 @@ menuconfig DRM_TINYDRM 
	help

	  Choose this option if you have a tinydrm supported display.

	  If M is selected the module will be called tinydrm.



config TINYDRM_MIPI_DBI

	tristate

drivers/gpu/drm/tinydrm/Makefile

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obj-$(CONFIG_DRM_TINYDRM)		+= core/



# Controllers

obj-$(CONFIG_TINYDRM_MIPI_DBI)		+= mipi-dbi.o

drivers/gpu/drm/tinydrm/mipi-dbi.c

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File added.

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include/drm/tinydrm/mipi-dbi.h

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/*

 * MIPI Display Bus Interface (DBI) LCD controller support

 *

 * 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.

 */



#ifndef __LINUX_MIPI_DBI_H

#define __LINUX_MIPI_DBI_H



#include <drm/tinydrm/tinydrm.h>



struct spi_device;

struct gpio_desc;

struct regulator;



/**

 * struct mipi_dbi - MIPI DBI controller

 * @tinydrm: tinydrm base

 * @spi: SPI device

 * @enabled: Pipeline is enabled

 * @cmdlock: Command lock

 * @command: Bus specific callback executing commands.

 * @read_commands: Array of read commands terminated by a zero entry.

 *                 Reading is disabled if this is NULL.

 * @dc: Optional D/C gpio.

 * @tx_buf: Buffer used for transfer (copy clip rect area)

 * @tx_buf9: Buffer used for Option 1 9-bit conversion

 * @tx_buf9_len: Size of tx_buf9.

 * @swap_bytes: Swap bytes in buffer before transfer

 * @reset: Optional reset gpio

 * @rotation: initial rotation in degrees Counter Clock Wise

 * @backlight: backlight device (optional)

 * @regulator: power regulator (optional)

 */

struct mipi_dbi {

	struct tinydrm_device tinydrm;

	struct spi_device *spi;

	bool enabled;

	struct mutex cmdlock;

	int (*command)(struct mipi_dbi *mipi, u8 cmd, u8 *param, size_t num);

	const u8 *read_commands;

	struct gpio_desc *dc;

	u16 *tx_buf;

	void *tx_buf9;

	size_t tx_buf9_len;

	bool swap_bytes;

	struct gpio_desc *reset;

	unsigned int rotation;

	struct backlight_device *backlight;

	struct regulator *regulator;

};



static inline struct mipi_dbi *

mipi_dbi_from_tinydrm(struct tinydrm_device *tdev)

{

	return container_of(tdev, struct mipi_dbi, tinydrm);

}



int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,

		      struct gpio_desc *dc,

		      const struct drm_simple_display_pipe_funcs *pipe_funcs,

		      struct drm_driver *driver,

		      const struct drm_display_mode *mode,

		      unsigned int rotation);

int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,

		  const struct drm_simple_display_pipe_funcs *pipe_funcs,

		  struct drm_driver *driver,

		  const struct drm_display_mode *mode, unsigned int rotation);

void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,

			  struct drm_crtc_state *crtc_state);

void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);

void mipi_dbi_hw_reset(struct mipi_dbi *mipi);

bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);



int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);

int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);



/**

 * mipi_dbi_command - MIPI DCS command with optional parameter(s)

 * @mipi: MIPI 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(mipi, cmd, seq...) \

({ \

	u8 d[] = { seq }; \

	mipi_dbi_command_buf(mipi, 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 */