491 lines
15 KiB
C
491 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* MIPI DSI Bus
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*
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* Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
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* Copyright (C) 2018 STMicroelectronics - All Rights Reserved
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* Author(s): Andrzej Hajda <a.hajda@samsung.com>
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* Yannick Fertre <yannick.fertre@st.com>
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* Philippe Cornu <philippe.cornu@st.com>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef MIPI_DSI_H
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#define MIPI_DSI_H
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#include <mipi_display.h>
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#include <linux/bitops.h>
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struct mipi_dsi_host;
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struct mipi_dsi_device;
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/* request ACK from peripheral */
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#define MIPI_DSI_MSG_REQ_ACK BIT(0)
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/* use Low Power Mode to transmit message */
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#define MIPI_DSI_MSG_USE_LPM BIT(1)
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/**
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* struct mipi_dsi_msg - read/write DSI buffer
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* @channel: virtual channel id
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* @type: payload data type
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* @flags: flags controlling this message transmission
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* @tx_len: length of @tx_buf
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* @tx_buf: data to be written
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* @rx_len: length of @rx_buf
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* @rx_buf: data to be read, or NULL
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*/
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struct mipi_dsi_msg {
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u8 channel;
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u8 type;
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u16 flags;
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size_t tx_len;
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const void *tx_buf;
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size_t rx_len;
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void *rx_buf;
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};
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bool mipi_dsi_packet_format_is_short(u8 type);
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bool mipi_dsi_packet_format_is_long(u8 type);
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/**
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* struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format
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* @size: size (in bytes) of the packet
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* @header: the four bytes that make up the header (Data ID, Word Count or
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* Packet Data, and ECC)
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* @payload_length: number of bytes in the payload
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* @payload: a pointer to a buffer containing the payload, if any
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*/
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struct mipi_dsi_packet {
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size_t size;
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u8 header[4];
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size_t payload_length;
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const u8 *payload;
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};
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int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
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const struct mipi_dsi_msg *msg);
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/**
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* struct mipi_dsi_host_ops - DSI bus operations
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* @attach: attach DSI device to DSI host
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* @detach: detach DSI device from DSI host
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* @transfer: transmit a DSI packet
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*
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* DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
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* structures. This structure contains information about the type of packet
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* being transmitted as well as the transmit and receive buffers. When an
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* error is encountered during transmission, this function will return a
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* negative error code. On success it shall return the number of bytes
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* transmitted for write packets or the number of bytes received for read
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* packets.
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*
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* Note that typically DSI packet transmission is atomic, so the .transfer()
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* function will seldomly return anything other than the number of bytes
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* contained in the transmit buffer on success.
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*/
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struct mipi_dsi_host_ops {
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int (*attach)(struct mipi_dsi_host *host,
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struct mipi_dsi_device *dsi);
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int (*detach)(struct mipi_dsi_host *host,
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struct mipi_dsi_device *dsi);
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ssize_t (*transfer)(struct mipi_dsi_host *host,
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const struct mipi_dsi_msg *msg);
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};
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/**
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* struct mipi_dsi_phy_timing - DSI host phy timings
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* @data_hs2lp: High Speed to Low Speed Data Transition Time
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* @data_lp2hs: Low Speed to High Speed Data Transition Time
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* @clk_hs2lp: High Speed to Low Speed Clock Transition Time
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* @clk_lp2hs: Low Speed to High Speed Clock Transition Time
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*/
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struct mipi_dsi_phy_timing {
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u16 data_hs2lp;
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u16 data_lp2hs;
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u16 clk_hs2lp;
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u16 clk_lp2hs;
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};
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/**
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* struct mipi_dsi_phy_ops - DSI host physical operations
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* @init: initialized host physical part
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* @get_lane_mbps: get lane bitrate per lane (mbps)
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* @post_set_mode: operation that should after set mode
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*/
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struct mipi_dsi_phy_ops {
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int (*init)(void *priv_data);
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int (*get_lane_mbps)(void *priv_data, struct display_timing *timings,
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u32 lanes, u32 format, unsigned int *lane_mbps);
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void (*post_set_mode)(void *priv_data, unsigned long mode_flags);
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int (*get_timing)(void *priv_data, unsigned int lane_mbps,
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struct mipi_dsi_phy_timing *timing);
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void (*get_esc_clk_rate)(void *priv_data, unsigned int *esc_clk_rate);
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};
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/**
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* struct mipi_dsi_host - DSI host device
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* @dev: driver model device node for this DSI host
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* @ops: DSI host operations
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* @list: list management
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*/
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struct mipi_dsi_host {
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struct device *dev;
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const struct mipi_dsi_host_ops *ops;
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struct list_head list;
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};
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/* DSI mode flags */
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/* video mode */
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#define MIPI_DSI_MODE_VIDEO BIT(0)
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/* video burst mode */
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#define MIPI_DSI_MODE_VIDEO_BURST BIT(1)
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/* video pulse mode */
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#define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2)
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/* enable auto vertical count mode */
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#define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3)
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/* enable hsync-end packets in vsync-pulse and v-porch area */
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#define MIPI_DSI_MODE_VIDEO_HSE BIT(4)
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/* disable hfront-porch area */
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#define MIPI_DSI_MODE_VIDEO_HFP BIT(5)
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/* disable hback-porch area */
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#define MIPI_DSI_MODE_VIDEO_HBP BIT(6)
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/* disable hsync-active area */
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#define MIPI_DSI_MODE_VIDEO_HSA BIT(7)
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/* flush display FIFO on vsync pulse */
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#define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8)
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/* disable EoT packets in HS mode */
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#define MIPI_DSI_MODE_EOT_PACKET BIT(9)
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/* device supports non-continuous clock behavior (DSI spec 5.6.1) */
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#define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10)
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/* transmit data in low power */
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#define MIPI_DSI_MODE_LPM BIT(11)
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enum mipi_dsi_pixel_format {
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MIPI_DSI_FMT_RGB888,
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MIPI_DSI_FMT_RGB666,
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MIPI_DSI_FMT_RGB666_PACKED,
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MIPI_DSI_FMT_RGB565,
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};
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#define DSI_DEV_NAME_SIZE 20
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/**
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* struct mipi_dsi_device_info - template for creating a mipi_dsi_device
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* @type: DSI peripheral chip type
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* @channel: DSI virtual channel assigned to peripheral
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* @node: pointer to OF device node or NULL
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*
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* This is populated and passed to mipi_dsi_device_new to create a new
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* DSI device
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*/
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struct mipi_dsi_device_info {
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char type[DSI_DEV_NAME_SIZE];
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u32 channel;
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struct device_node *node;
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};
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/**
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* struct mipi_dsi_device - DSI peripheral device
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* @host: DSI host for this peripheral
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* @dev: driver model device node for this peripheral
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* @name: DSI peripheral chip type
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* @channel: virtual channel assigned to the peripheral
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* @format: pixel format for video mode
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* @lanes: number of active data lanes
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* @mode_flags: DSI operation mode related flags
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*/
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struct mipi_dsi_device {
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struct mipi_dsi_host *host;
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struct udevice *dev;
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char name[DSI_DEV_NAME_SIZE];
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unsigned int channel;
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unsigned int lanes;
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enum mipi_dsi_pixel_format format;
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unsigned long mode_flags;
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};
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/**
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* mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
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* given pixel format defined by the MIPI DSI
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* specification
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* @fmt: MIPI DSI pixel format
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*
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* Returns: The number of bits per pixel of the given pixel format.
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*/
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static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
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{
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switch (fmt) {
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case MIPI_DSI_FMT_RGB888:
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case MIPI_DSI_FMT_RGB666:
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return 24;
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case MIPI_DSI_FMT_RGB666_PACKED:
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return 18;
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case MIPI_DSI_FMT_RGB565:
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return 16;
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}
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return -EINVAL;
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}
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/**
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* struct mipi_dsi_panel_plat - DSI panel platform data
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* @device: DSI peripheral device
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* @lanes: number of active data lanes
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* @format: pixel format for video mode
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* @mode_flags: DSI operation mode related flags
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*/
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struct mipi_dsi_panel_plat {
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struct mipi_dsi_device *device;
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unsigned int lanes;
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enum mipi_dsi_pixel_format format;
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unsigned long mode_flags;
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};
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/**
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* mipi_dsi_attach - attach a DSI device to its DSI host
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* @dsi: DSI peripheral
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*/
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int mipi_dsi_attach(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_detach - detach a DSI device from its DSI host
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* @dsi: DSI peripheral
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*/
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int mipi_dsi_detach(struct mipi_dsi_device *dsi);
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int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
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int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
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int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
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u16 value);
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ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
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size_t size);
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ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
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size_t num_params, void *data, size_t size);
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/**
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* enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
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* @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
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* information only
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* @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
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* V-Blanking and H-Blanking information
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*/
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enum mipi_dsi_dcs_tear_mode {
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MIPI_DSI_DCS_TEAR_MODE_VBLANK,
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MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
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};
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#define MIPI_DSI_DCS_POWER_MODE_DISPLAY BIT(2)
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#define MIPI_DSI_DCS_POWER_MODE_NORMAL BIT(3)
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#define MIPI_DSI_DCS_POWER_MODE_SLEEP BIT(4)
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#define MIPI_DSI_DCS_POWER_MODE_PARTIAL BIT(5)
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#define MIPI_DSI_DCS_POWER_MODE_IDLE BIT(6)
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/**
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* mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
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* @dsi: DSI peripheral device
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* @data: buffer containing data to be transmitted
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* @len: size of transmission buffer
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*
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* This function will automatically choose the right data type depending on
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* the command payload length.
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*
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* Return: The number of bytes successfully transmitted or a negative error
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* code on failure.
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*/
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ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
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const void *data, size_t len);
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/**
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* mipi_dsi_dcs_write() - send DCS write command
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* @dsi: DSI peripheral device
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* @cmd: DCS command
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* @data: buffer containing the command payload
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* @len: command payload length
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*
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* This function will automatically choose the right data type depending on
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* the command payload length.
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* code on failure.
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*/
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ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
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const void *data, size_t len);
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/**
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* mipi_dsi_dcs_read() - send DCS read request command
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* @dsi: DSI peripheral device
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* @cmd: DCS command
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* @data: buffer in which to receive data
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* @len: size of receive buffer
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*
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* Return: The number of bytes read or a negative error code on failure.
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*/
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ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
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size_t len);
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/**
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* mipi_dsi_dcs_nop() - send DCS nop packet
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_get_power_mode() - query the display module's current power
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* mode
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* @dsi: DSI peripheral device
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* @mode: return location for the current power mode
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
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/**
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* mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
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* data used by the interface
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* @dsi: DSI peripheral device
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* @format: return location for the pixel format
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
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/**
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* mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
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* display module except interface communication
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
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* module
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
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* display device
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_set_display_on() - start displaying the image data on the
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* display device
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure
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*/
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int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_set_column_address() - define the column extent of the frame
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* memory accessed by the host processor
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* @dsi: DSI peripheral device
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* @start: first column of frame memory
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* @end: last column of frame memory
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
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u16 end);
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/**
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* mipi_dsi_dcs_set_page_address() - define the page extent of the frame
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* memory accessed by the host processor
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* @dsi: DSI peripheral device
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* @start: first page of frame memory
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* @end: last page of frame memory
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
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u16 end);
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/**
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* mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
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* output signal on the TE signal line
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* @dsi: DSI peripheral device
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*
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* Return: 0 on success or a negative error code on failure
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*/
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int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
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/**
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* mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
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* output signal on the TE signal line.
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* @dsi: DSI peripheral device
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* @mode: the Tearing Effect Output Line mode
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*
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* Return: 0 on success or a negative error code on failure
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*/
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int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
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enum mipi_dsi_dcs_tear_mode mode);
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/**
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* mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
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* data used by the interface
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* @dsi: DSI peripheral device
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* @format: pixel format
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
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/**
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* mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
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* the Tearing Effect output signal of the display module
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* @dsi: DSI peripheral device
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* @scanline: scanline to use as trigger
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*
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* Return: 0 on success or a negative error code on failure
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*/
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int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
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/**
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* mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
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* display
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* @dsi: DSI peripheral device
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* @brightness: brightness value
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
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u16 brightness);
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/**
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* mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
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* of the display
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* @dsi: DSI peripheral device
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* @brightness: brightness value
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
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u16 *brightness);
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#endif /* MIPI_DSI_H */
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