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5f18c0782b
The panel has a prepare call which is before video starts, and an
enable call which is after.
The Toshiba bridge should be configured before video, so move
the relevant power and initialisation calls to prepare.
Fixes: 2f733d6194
("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220415162513.42190-3-stefan.wahren@i2se.com
516 lines
13 KiB
C
516 lines
13 KiB
C
/*
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* Copyright © 2016-2017 Broadcom
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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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* Portions of this file (derived from panel-simple.c) are:
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*
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* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Raspberry Pi 7" touchscreen panel driver.
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*
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* The 7" touchscreen consists of a DPI LCD panel, a Toshiba
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* TC358762XBG DSI-DPI bridge, and an I2C-connected Atmel ATTINY88-MUR
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* controlling power management, the LCD PWM, and initial register
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* setup of the Tohsiba.
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*
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* This driver controls the TC358762 and ATTINY88, presenting a DSI
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* device with a drm_panel.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/pm.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_device.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_panel.h>
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#define RPI_DSI_DRIVER_NAME "rpi-ts-dsi"
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/* I2C registers of the Atmel microcontroller. */
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enum REG_ADDR {
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REG_ID = 0x80,
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REG_PORTA, /* BIT(2) for horizontal flip, BIT(3) for vertical flip */
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REG_PORTB,
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REG_PORTC,
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REG_PORTD,
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REG_POWERON,
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REG_PWM,
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REG_DDRA,
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REG_DDRB,
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REG_DDRC,
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REG_DDRD,
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REG_TEST,
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REG_WR_ADDRL,
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REG_WR_ADDRH,
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REG_READH,
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REG_READL,
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REG_WRITEH,
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REG_WRITEL,
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REG_ID2,
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};
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/* DSI D-PHY Layer Registers */
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#define D0W_DPHYCONTTX 0x0004
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#define CLW_DPHYCONTRX 0x0020
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#define D0W_DPHYCONTRX 0x0024
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#define D1W_DPHYCONTRX 0x0028
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#define COM_DPHYCONTRX 0x0038
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#define CLW_CNTRL 0x0040
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#define D0W_CNTRL 0x0044
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#define D1W_CNTRL 0x0048
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#define DFTMODE_CNTRL 0x0054
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/* DSI PPI Layer Registers */
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#define PPI_STARTPPI 0x0104
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#define PPI_BUSYPPI 0x0108
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#define PPI_LINEINITCNT 0x0110
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#define PPI_LPTXTIMECNT 0x0114
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#define PPI_CLS_ATMR 0x0140
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#define PPI_D0S_ATMR 0x0144
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#define PPI_D1S_ATMR 0x0148
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#define PPI_D0S_CLRSIPOCOUNT 0x0164
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#define PPI_D1S_CLRSIPOCOUNT 0x0168
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#define CLS_PRE 0x0180
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#define D0S_PRE 0x0184
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#define D1S_PRE 0x0188
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#define CLS_PREP 0x01A0
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#define D0S_PREP 0x01A4
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#define D1S_PREP 0x01A8
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#define CLS_ZERO 0x01C0
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#define D0S_ZERO 0x01C4
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#define D1S_ZERO 0x01C8
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#define PPI_CLRFLG 0x01E0
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#define PPI_CLRSIPO 0x01E4
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#define HSTIMEOUT 0x01F0
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#define HSTIMEOUTENABLE 0x01F4
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/* DSI Protocol Layer Registers */
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#define DSI_STARTDSI 0x0204
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#define DSI_BUSYDSI 0x0208
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#define DSI_LANEENABLE 0x0210
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# define DSI_LANEENABLE_CLOCK BIT(0)
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# define DSI_LANEENABLE_D0 BIT(1)
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# define DSI_LANEENABLE_D1 BIT(2)
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#define DSI_LANESTATUS0 0x0214
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#define DSI_LANESTATUS1 0x0218
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#define DSI_INTSTATUS 0x0220
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#define DSI_INTMASK 0x0224
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#define DSI_INTCLR 0x0228
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#define DSI_LPTXTO 0x0230
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#define DSI_MODE 0x0260
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#define DSI_PAYLOAD0 0x0268
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#define DSI_PAYLOAD1 0x026C
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#define DSI_SHORTPKTDAT 0x0270
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#define DSI_SHORTPKTREQ 0x0274
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#define DSI_BTASTA 0x0278
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#define DSI_BTACLR 0x027C
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/* DSI General Registers */
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#define DSIERRCNT 0x0300
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#define DSISIGMOD 0x0304
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/* DSI Application Layer Registers */
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#define APLCTRL 0x0400
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#define APLSTAT 0x0404
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#define APLERR 0x0408
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#define PWRMOD 0x040C
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#define RDPKTLN 0x0410
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#define PXLFMT 0x0414
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#define MEMWRCMD 0x0418
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/* LCDC/DPI Host Registers */
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#define LCDCTRL 0x0420
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#define HSR 0x0424
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#define HDISPR 0x0428
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#define VSR 0x042C
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#define VDISPR 0x0430
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#define VFUEN 0x0434
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/* DBI-B Host Registers */
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#define DBIBCTRL 0x0440
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/* SPI Master Registers */
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#define SPICMR 0x0450
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#define SPITCR 0x0454
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/* System Controller Registers */
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#define SYSSTAT 0x0460
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#define SYSCTRL 0x0464
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#define SYSPLL1 0x0468
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#define SYSPLL2 0x046C
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#define SYSPLL3 0x0470
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#define SYSPMCTRL 0x047C
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/* GPIO Registers */
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#define GPIOC 0x0480
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#define GPIOO 0x0484
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#define GPIOI 0x0488
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/* I2C Registers */
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#define I2CCLKCTRL 0x0490
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/* Chip/Rev Registers */
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#define IDREG 0x04A0
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/* Debug Registers */
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#define WCMDQUEUE 0x0500
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#define RCMDQUEUE 0x0504
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struct rpi_touchscreen {
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struct drm_panel base;
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struct mipi_dsi_device *dsi;
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struct i2c_client *i2c;
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};
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static const struct drm_display_mode rpi_touchscreen_modes[] = {
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{
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/* Modeline comes from the Raspberry Pi firmware, with HFP=1
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* plugged in and clock re-computed from that.
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*/
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.clock = 25979400 / 1000,
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.hdisplay = 800,
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.hsync_start = 800 + 1,
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.hsync_end = 800 + 1 + 2,
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.htotal = 800 + 1 + 2 + 46,
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.vdisplay = 480,
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.vsync_start = 480 + 7,
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.vsync_end = 480 + 7 + 2,
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.vtotal = 480 + 7 + 2 + 21,
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},
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};
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static struct rpi_touchscreen *panel_to_ts(struct drm_panel *panel)
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{
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return container_of(panel, struct rpi_touchscreen, base);
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}
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static int rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
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{
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return i2c_smbus_read_byte_data(ts->i2c, reg);
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}
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static void rpi_touchscreen_i2c_write(struct rpi_touchscreen *ts,
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u8 reg, u8 val)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(ts->i2c, reg, val);
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if (ret)
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dev_err(&ts->i2c->dev, "I2C write failed: %d\n", ret);
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}
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static int rpi_touchscreen_write(struct rpi_touchscreen *ts, u16 reg, u32 val)
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{
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u8 msg[] = {
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reg,
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reg >> 8,
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val,
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val >> 8,
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val >> 16,
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val >> 24,
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};
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mipi_dsi_generic_write(ts->dsi, msg, sizeof(msg));
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return 0;
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}
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static int rpi_touchscreen_disable(struct drm_panel *panel)
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{
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struct rpi_touchscreen *ts = panel_to_ts(panel);
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rpi_touchscreen_i2c_write(ts, REG_PWM, 0);
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rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
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udelay(1);
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return 0;
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}
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static int rpi_touchscreen_noop(struct drm_panel *panel)
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{
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return 0;
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}
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static int rpi_touchscreen_prepare(struct drm_panel *panel)
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{
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struct rpi_touchscreen *ts = panel_to_ts(panel);
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int i;
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rpi_touchscreen_i2c_write(ts, REG_POWERON, 1);
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/* Wait for nPWRDWN to go low to indicate poweron is done. */
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for (i = 0; i < 100; i++) {
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if (rpi_touchscreen_i2c_read(ts, REG_PORTB) & 1)
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break;
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}
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rpi_touchscreen_write(ts, DSI_LANEENABLE,
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DSI_LANEENABLE_CLOCK |
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DSI_LANEENABLE_D0);
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rpi_touchscreen_write(ts, PPI_D0S_CLRSIPOCOUNT, 0x05);
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rpi_touchscreen_write(ts, PPI_D1S_CLRSIPOCOUNT, 0x05);
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rpi_touchscreen_write(ts, PPI_D0S_ATMR, 0x00);
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rpi_touchscreen_write(ts, PPI_D1S_ATMR, 0x00);
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rpi_touchscreen_write(ts, PPI_LPTXTIMECNT, 0x03);
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rpi_touchscreen_write(ts, SPICMR, 0x00);
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rpi_touchscreen_write(ts, LCDCTRL, 0x00100150);
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rpi_touchscreen_write(ts, SYSCTRL, 0x040f);
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msleep(100);
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rpi_touchscreen_write(ts, PPI_STARTPPI, 0x01);
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rpi_touchscreen_write(ts, DSI_STARTDSI, 0x01);
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msleep(100);
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return 0;
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}
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static int rpi_touchscreen_enable(struct drm_panel *panel)
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{
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struct rpi_touchscreen *ts = panel_to_ts(panel);
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/* Turn on the backlight. */
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rpi_touchscreen_i2c_write(ts, REG_PWM, 255);
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/* Default to the same orientation as the closed source
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* firmware used for the panel. Runtime rotation
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* configuration will be supported using VC4's plane
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* orientation bits.
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*/
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rpi_touchscreen_i2c_write(ts, REG_PORTA, BIT(2));
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return 0;
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}
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static int rpi_touchscreen_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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unsigned int i, num = 0;
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static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
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for (i = 0; i < ARRAY_SIZE(rpi_touchscreen_modes); i++) {
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const struct drm_display_mode *m = &rpi_touchscreen_modes[i];
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(connector->dev, m);
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if (!mode) {
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dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
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m->hdisplay, m->vdisplay,
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drm_mode_vrefresh(m));
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continue;
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}
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mode->type |= DRM_MODE_TYPE_DRIVER;
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if (i == 0)
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mode->type |= DRM_MODE_TYPE_PREFERRED;
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drm_mode_set_name(mode);
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drm_mode_probed_add(connector, mode);
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num++;
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}
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connector->display_info.bpc = 8;
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connector->display_info.width_mm = 154;
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connector->display_info.height_mm = 86;
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drm_display_info_set_bus_formats(&connector->display_info,
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&bus_format, 1);
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return num;
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}
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static const struct drm_panel_funcs rpi_touchscreen_funcs = {
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.disable = rpi_touchscreen_disable,
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.unprepare = rpi_touchscreen_noop,
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.prepare = rpi_touchscreen_prepare,
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.enable = rpi_touchscreen_enable,
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.get_modes = rpi_touchscreen_get_modes,
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};
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static int rpi_touchscreen_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct device *dev = &i2c->dev;
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struct rpi_touchscreen *ts;
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struct device_node *endpoint, *dsi_host_node;
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struct mipi_dsi_host *host;
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int ver;
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struct mipi_dsi_device_info info = {
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.type = RPI_DSI_DRIVER_NAME,
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.channel = 0,
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.node = NULL,
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};
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ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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i2c_set_clientdata(i2c, ts);
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ts->i2c = i2c;
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ver = rpi_touchscreen_i2c_read(ts, REG_ID);
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if (ver < 0) {
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dev_err(dev, "Atmel I2C read failed: %d\n", ver);
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return -ENODEV;
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}
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switch (ver) {
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case 0xde: /* ver 1 */
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case 0xc3: /* ver 2 */
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break;
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default:
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dev_err(dev, "Unknown Atmel firmware revision: 0x%02x\n", ver);
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return -ENODEV;
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}
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/* Turn off at boot, so we can cleanly sequence powering on. */
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rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
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/* Look up the DSI host. It needs to probe before we do. */
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endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
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if (!endpoint)
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return -ENODEV;
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dsi_host_node = of_graph_get_remote_port_parent(endpoint);
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if (!dsi_host_node)
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goto error;
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host = of_find_mipi_dsi_host_by_node(dsi_host_node);
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of_node_put(dsi_host_node);
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if (!host) {
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of_node_put(endpoint);
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return -EPROBE_DEFER;
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}
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info.node = of_graph_get_remote_port(endpoint);
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if (!info.node)
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goto error;
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of_node_put(endpoint);
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ts->dsi = mipi_dsi_device_register_full(host, &info);
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if (IS_ERR(ts->dsi)) {
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dev_err(dev, "DSI device registration failed: %ld\n",
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PTR_ERR(ts->dsi));
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return PTR_ERR(ts->dsi);
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}
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drm_panel_init(&ts->base, dev, &rpi_touchscreen_funcs,
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DRM_MODE_CONNECTOR_DSI);
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/* This appears last, as it's what will unblock the DSI host
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* driver's component bind function.
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*/
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drm_panel_add(&ts->base);
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return 0;
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error:
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of_node_put(endpoint);
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return -ENODEV;
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}
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static int rpi_touchscreen_remove(struct i2c_client *i2c)
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{
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struct rpi_touchscreen *ts = i2c_get_clientdata(i2c);
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mipi_dsi_detach(ts->dsi);
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drm_panel_remove(&ts->base);
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mipi_dsi_device_unregister(ts->dsi);
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return 0;
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}
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static int rpi_touchscreen_dsi_probe(struct mipi_dsi_device *dsi)
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{
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int ret;
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dsi->mode_flags = (MIPI_DSI_MODE_VIDEO |
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MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
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MIPI_DSI_MODE_LPM);
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dsi->format = MIPI_DSI_FMT_RGB888;
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dsi->lanes = 1;
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ret = mipi_dsi_attach(dsi);
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if (ret)
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dev_err(&dsi->dev, "failed to attach dsi to host: %d\n", ret);
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return ret;
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}
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static struct mipi_dsi_driver rpi_touchscreen_dsi_driver = {
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.driver.name = RPI_DSI_DRIVER_NAME,
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.probe = rpi_touchscreen_dsi_probe,
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};
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static const struct of_device_id rpi_touchscreen_of_ids[] = {
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{ .compatible = "raspberrypi,7inch-touchscreen-panel" },
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{ } /* sentinel */
|
|
};
|
|
MODULE_DEVICE_TABLE(of, rpi_touchscreen_of_ids);
|
|
|
|
static struct i2c_driver rpi_touchscreen_driver = {
|
|
.driver = {
|
|
.name = "rpi_touchscreen",
|
|
.of_match_table = rpi_touchscreen_of_ids,
|
|
},
|
|
.probe = rpi_touchscreen_probe,
|
|
.remove = rpi_touchscreen_remove,
|
|
};
|
|
|
|
static int __init rpi_touchscreen_init(void)
|
|
{
|
|
mipi_dsi_driver_register(&rpi_touchscreen_dsi_driver);
|
|
return i2c_add_driver(&rpi_touchscreen_driver);
|
|
}
|
|
module_init(rpi_touchscreen_init);
|
|
|
|
static void __exit rpi_touchscreen_exit(void)
|
|
{
|
|
i2c_del_driver(&rpi_touchscreen_driver);
|
|
mipi_dsi_driver_unregister(&rpi_touchscreen_dsi_driver);
|
|
}
|
|
module_exit(rpi_touchscreen_exit);
|
|
|
|
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
|
|
MODULE_DESCRIPTION("Raspberry Pi 7-inch touchscreen driver");
|
|
MODULE_LICENSE("GPL v2");
|