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Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0126-drm-panel-Add-support-for-the-Raspberry-Pi-7-Touchsc.patch')
-rw-r--r--target/linux/brcm2708/patches-4.14/950-0126-drm-panel-Add-support-for-the-Raspberry-Pi-7-Touchsc.patch576
1 files changed, 576 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0126-drm-panel-Add-support-for-the-Raspberry-Pi-7-Touchsc.patch b/target/linux/brcm2708/patches-4.14/950-0126-drm-panel-Add-support-for-the-Raspberry-Pi-7-Touchsc.patch
new file mode 100644
index 0000000000..0f1abf00f4
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.14/950-0126-drm-panel-Add-support-for-the-Raspberry-Pi-7-Touchsc.patch
@@ -0,0 +1,576 @@
+From a28a55876fa9df72d7e3c1bc0fc2ea4bd65337f0 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Tue, 26 Apr 2016 13:46:13 -0700
+Subject: [PATCH 126/454] drm/panel: Add support for the Raspberry Pi 7"
+ Touchscreen.
+
+This driver communicates with the Atmel microcontroller for sequencing
+the poweron of the TC358762 DSI-DPI bridge and controlling the
+backlight PWM.
+
+The following lines are required in config.txt, to keep the firmware
+from trying to bash our I2C lines and steal the DSI interrupts:
+
+ disable_touchscreen=1
+ ignore_lcd=2
+ mask_gpu_interrupt1=0x1000
+
+This means that the firmware won't power on the panel at boot time (no
+rainbow) and the touchscreen input won't work. The native input
+driver for the touchscreen still needs to be written.
+
+v2: Set the same default orientation as the closed source firmware
+ used, which is the best for viewing angle.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/gpu/drm/panel/Kconfig | 8 +
+ drivers/gpu/drm/panel/Makefile | 1 +
+ .../drm/panel/panel-raspberrypi-touchscreen.c | 514 ++++++++++++++++++
+ 3 files changed, 523 insertions(+)
+ create mode 100644 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+
+--- a/drivers/gpu/drm/panel/Kconfig
++++ b/drivers/gpu/drm/panel/Kconfig
+@@ -73,6 +73,14 @@ config DRM_PANEL_PANASONIC_VVX10F034N00
+ WUXGA (1920x1200) Novatek NT1397-based DSI panel as found in some
+ Xperia Z2 tablets
+
++config DRM_PANEL_RASPBERRYPI_TOUCHSCREEN
++ tristate "Raspberry Pi 7-inch touchscreen panel"
++ depends on DRM_MIPI_DSI
++ help
++ Say Y here if you want to enable support for the Raspberry
++ Pi 7" Touchscreen. To compile this driver as a module,
++ choose M here.
++
+ config DRM_PANEL_SAMSUNG_S6E3HA2
+ tristate "Samsung S6E3HA2 DSI video mode panel"
+ depends on OF
+--- a/drivers/gpu/drm/panel/Makefile
++++ b/drivers/gpu/drm/panel/Makefile
+@@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA)
+ obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
+ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
+ obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
++obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o
+ obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
+ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
+ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
+--- /dev/null
++++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+@@ -0,0 +1,514 @@
++/*
++ * Copyright © 2016 Broadcom
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ *
++ * Portions of this file (derived from panel-simple.c) are:
++ *
++ * Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
++ *
++ * Permission is hereby granted, free of charge, to any person obtaining a
++ * copy of this software and associated documentation files (the "Software"),
++ * to deal in the Software without restriction, including without limitation
++ * the rights to use, copy, modify, merge, publish, distribute, sub license,
++ * and/or sell copies of the Software, and to permit persons to whom the
++ * Software is furnished to do so, subject to the following conditions:
++ *
++ * The above copyright notice and this permission notice (including the
++ * next paragraph) shall be included in all copies or substantial portions
++ * of the Software.
++ *
++ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
++ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
++ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
++ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
++ * DEALINGS IN THE SOFTWARE.
++ */
++
++/**
++ * DOC: Raspberry Pi 7" touchscreen panel driver.
++ *
++ * The 7" touchscreen consists of a DPI LCD panel, a Toshiba
++ * TC358762XBG DSI-DPI bridge, and an I2C-connected Atmel ATTINY88-MUR
++ * controlling power management, the LCD PWM, and the touchscreen.
++ *
++ * This driver presents this device as a MIPI DSI panel to the DRM
++ * driver, and should expose the touchscreen as a HID device.
++ */
++
++#include <linux/delay.h>
++#include <linux/err.h>
++#include <linux/fb.h>
++#include <linux/gpio.h>
++#include <linux/gpio/consumer.h>
++#include <linux/i2c.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/of_graph.h>
++#include <linux/pm.h>
++
++#include <drm/drm_panel.h>
++#include <drm/drmP.h>
++#include <drm/drm_crtc.h>
++#include <drm/drm_mipi_dsi.h>
++#include <drm/drm_panel.h>
++
++/* I2C registers of the Atmel microcontroller. */
++enum REG_ADDR {
++ REG_ID = 0x80,
++ REG_PORTA, // BIT(2) for horizontal flip, BIT(3) for vertical flip
++ REG_PORTB,
++ REG_PORTC,
++ REG_PORTD,
++ REG_POWERON,
++ REG_PWM,
++ REG_DDRA,
++ REG_DDRB,
++ REG_DDRC,
++ REG_DDRD,
++ REG_TEST,
++ REG_WR_ADDRL,
++ REG_WR_ADDRH,
++ REG_READH,
++ REG_READL,
++ REG_WRITEH,
++ REG_WRITEL,
++ REG_ID2,
++};
++
++/* We only turn the PWM on or off, without varying values. */
++#define RPI_TOUCHSCREEN_MAX_BRIGHTNESS 1
++
++/* DSI D-PHY Layer Registers */
++#define D0W_DPHYCONTTX 0x0004
++#define CLW_DPHYCONTRX 0x0020
++#define D0W_DPHYCONTRX 0x0024
++#define D1W_DPHYCONTRX 0x0028
++#define COM_DPHYCONTRX 0x0038
++#define CLW_CNTRL 0x0040
++#define D0W_CNTRL 0x0044
++#define D1W_CNTRL 0x0048
++#define DFTMODE_CNTRL 0x0054
++
++/* DSI PPI Layer Registers */
++#define PPI_STARTPPI 0x0104
++#define PPI_BUSYPPI 0x0108
++#define PPI_LINEINITCNT 0x0110
++#define PPI_LPTXTIMECNT 0x0114
++//#define PPI_LANEENABLE 0x0134
++//#define PPI_TX_RX_TA 0x013C
++#define PPI_CLS_ATMR 0x0140
++#define PPI_D0S_ATMR 0x0144
++#define PPI_D1S_ATMR 0x0148
++#define PPI_D0S_CLRSIPOCOUNT 0x0164
++#define PPI_D1S_CLRSIPOCOUNT 0x0168
++#define CLS_PRE 0x0180
++#define D0S_PRE 0x0184
++#define D1S_PRE 0x0188
++#define CLS_PREP 0x01A0
++#define D0S_PREP 0x01A4
++#define D1S_PREP 0x01A8
++#define CLS_ZERO 0x01C0
++#define D0S_ZERO 0x01C4
++#define D1S_ZERO 0x01C8
++#define PPI_CLRFLG 0x01E0
++#define PPI_CLRSIPO 0x01E4
++#define HSTIMEOUT 0x01F0
++#define HSTIMEOUTENABLE 0x01F4
++
++/* DSI Protocol Layer Registers */
++#define DSI_STARTDSI 0x0204
++#define DSI_BUSYDSI 0x0208
++#define DSI_LANEENABLE 0x0210
++# define DSI_LANEENABLE_CLOCK BIT(0)
++# define DSI_LANEENABLE_D0 BIT(1)
++# define DSI_LANEENABLE_D1 BIT(2)
++
++#define DSI_LANESTATUS0 0x0214
++#define DSI_LANESTATUS1 0x0218
++#define DSI_INTSTATUS 0x0220
++#define DSI_INTMASK 0x0224
++#define DSI_INTCLR 0x0228
++#define DSI_LPTXTO 0x0230
++#define DSI_MODE 0x0260
++#define DSI_PAYLOAD0 0x0268
++#define DSI_PAYLOAD1 0x026C
++#define DSI_SHORTPKTDAT 0x0270
++#define DSI_SHORTPKTREQ 0x0274
++#define DSI_BTASTA 0x0278
++#define DSI_BTACLR 0x027C
++
++/* DSI General Registers */
++#define DSIERRCNT 0x0300
++#define DSISIGMOD 0x0304
++
++/* DSI Application Layer Registers */
++#define APLCTRL 0x0400
++#define APLSTAT 0x0404
++#define APLERR 0x0408
++#define PWRMOD 0x040C
++#define RDPKTLN 0x0410
++#define PXLFMT 0x0414
++#define MEMWRCMD 0x0418
++
++/* LCDC/DPI Host Registers */
++#define LCDCTRL 0x0420
++#define HSR 0x0424
++#define HDISPR 0x0428
++#define VSR 0x042C
++#define VDISPR 0x0430
++#define VFUEN 0x0434
++
++/* DBI-B Host Registers */
++#define DBIBCTRL 0x0440
++
++/* SPI Master Registers */
++#define SPICMR 0x0450
++#define SPITCR 0x0454
++
++/* System Controller Registers */
++#define SYSSTAT 0x0460
++#define SYSCTRL 0x0464
++#define SYSPLL1 0x0468
++#define SYSPLL2 0x046C
++#define SYSPLL3 0x0470
++#define SYSPMCTRL 0x047C
++
++/* GPIO Registers */
++#define GPIOC 0x0480
++#define GPIOO 0x0484
++#define GPIOI 0x0488
++
++/* I2C Registers */
++#define I2CCLKCTRL 0x0490
++
++/* Chip/Rev Registers */
++#define IDREG 0x04A0
++
++/* Debug Registers */
++#define WCMDQUEUE 0x0500
++#define RCMDQUEUE 0x0504
++
++struct rpi_touchscreen {
++ struct drm_panel base;
++ struct mipi_dsi_device *dsi;
++ struct i2c_client *bridge_i2c;
++
++ /* Version of the firmware on the bridge chip */
++ int atmel_ver;
++};
++
++static const struct drm_display_mode rpi_touchscreen_modes[] = {
++ {
++ /* The DSI PLL can only integer divide from the 2Ghz
++ * PLLD, giving us few choices. We pick a divide by 3
++ * as our DSI HS clock, giving us a pixel clock of
++ * that divided by 24 bits. Pad out HFP to get our
++ * panel to refresh at 60Hz, even if that doesn't
++ * match the datasheet.
++ */
++#define PIXEL_CLOCK ((2000000000 / 3) / 24)
++#define VREFRESH 60
++#define VTOTAL (480 + 7 + 2 + 21)
++#define HACT 800
++#define HSW 2
++#define HBP 46
++#define HFP ((PIXEL_CLOCK / (VTOTAL * VREFRESH)) - (HACT + HSW + HBP))
++
++ .clock = PIXEL_CLOCK / 1000,
++ .hdisplay = HACT,
++ .hsync_start = HACT + HFP,
++ .hsync_end = HACT + HFP + HSW,
++ .htotal = HACT + HFP + HSW + HBP,
++ .vdisplay = 480,
++ .vsync_start = 480 + 7,
++ .vsync_end = 480 + 7 + 2,
++ .vtotal = VTOTAL,
++ .vrefresh = 60,
++ },
++};
++
++static struct rpi_touchscreen *panel_to_ts(struct drm_panel *panel)
++{
++ return container_of(panel, struct rpi_touchscreen, base);
++}
++
++static u8 rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
++{
++ return i2c_smbus_read_byte_data(ts->bridge_i2c, reg);
++}
++
++static void rpi_touchscreen_i2c_write(struct rpi_touchscreen *ts,
++ u8 reg, u8 val)
++{
++ int ret;
++
++ ret = i2c_smbus_write_byte_data(ts->bridge_i2c, reg, val);
++ if (ret)
++ dev_err(&ts->dsi->dev, "I2C write failed: %d\n", ret);
++}
++
++static int rpi_touchscreen_write(struct rpi_touchscreen *ts, u16 reg, u32 val)
++{
++#if 0
++ /* The firmware uses LP DSI transactions like this to bring up
++ * the hardware, which should be faster than using I2C to then
++ * pass to the Toshiba. However, I was unable to get it to
++ * work.
++ */
++ u8 msg[] = {
++ reg,
++ reg >> 8,
++ val,
++ val >> 8,
++ val >> 16,
++ val >> 24,
++ };
++
++ mipi_dsi_dcs_write_buffer(ts->dsi, msg, sizeof(msg));
++#else
++ rpi_touchscreen_i2c_write(ts, REG_WR_ADDRH, reg >> 8);
++ rpi_touchscreen_i2c_write(ts, REG_WR_ADDRL, reg);
++ rpi_touchscreen_i2c_write(ts, REG_WRITEH, val >> 8);
++ rpi_touchscreen_i2c_write(ts, REG_WRITEL, val);
++#endif
++
++ return 0;
++}
++
++static int rpi_touchscreen_disable(struct drm_panel *panel)
++{
++ struct rpi_touchscreen *ts = panel_to_ts(panel);
++
++ rpi_touchscreen_i2c_write(ts, REG_PWM, 0);
++
++ rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
++ udelay(1);
++
++ return 0;
++}
++
++static int rpi_touchscreen_noop(struct drm_panel *panel)
++{
++ return 0;
++}
++
++static int rpi_touchscreen_enable(struct drm_panel *panel)
++{
++ struct rpi_touchscreen *ts = panel_to_ts(panel);
++ int i;
++
++ rpi_touchscreen_i2c_write(ts, REG_POWERON, 1);
++ /* Wait for nPWRDWN to go low to indicate poweron is done. */
++ for (i = 0; i < 100; i++) {
++ if (rpi_touchscreen_i2c_read(ts, REG_PORTB) & 1)
++ break;
++ }
++
++ rpi_touchscreen_write(ts, DSI_LANEENABLE,
++ DSI_LANEENABLE_CLOCK |
++ DSI_LANEENABLE_D0 |
++ (ts->dsi->lanes > 1 ? DSI_LANEENABLE_D1 : 0));
++ rpi_touchscreen_write(ts, PPI_D0S_CLRSIPOCOUNT, 0x05);
++ rpi_touchscreen_write(ts, PPI_D1S_CLRSIPOCOUNT, 0x05);
++ rpi_touchscreen_write(ts, PPI_D0S_ATMR, 0x00);
++ rpi_touchscreen_write(ts, PPI_D1S_ATMR, 0x00);
++ rpi_touchscreen_write(ts, PPI_LPTXTIMECNT, 0x03);
++
++ rpi_touchscreen_write(ts, SPICMR, 0x00);
++ rpi_touchscreen_write(ts, LCDCTRL, 0x00100150);
++ rpi_touchscreen_write(ts, SYSCTRL, 0x040f);
++ msleep(100);
++
++ rpi_touchscreen_write(ts, PPI_STARTPPI, 0x01);
++ rpi_touchscreen_write(ts, DSI_STARTDSI, 0x01);
++ msleep(100);
++
++ /* Turn on the backlight. */
++ rpi_touchscreen_i2c_write(ts, REG_PWM, 255);
++
++ /* Default to the same orientation as the closed source
++ * firmware used for the panel. Runtime rotation
++ * configuration will be supported using VC4's plane
++ * orientation bits.
++ */
++ rpi_touchscreen_i2c_write(ts, REG_PORTA, BIT(2));
++
++ return 0;
++}
++
++static int rpi_touchscreen_get_modes(struct drm_panel *panel)
++{
++ struct drm_connector *connector = panel->connector;
++ struct drm_device *drm = panel->drm;
++ unsigned int i, num = 0;
++
++ for (i = 0; i < ARRAY_SIZE(rpi_touchscreen_modes); i++) {
++ const struct drm_display_mode *m = &rpi_touchscreen_modes[i];
++ struct drm_display_mode *mode;
++
++ mode = drm_mode_duplicate(drm, m);
++ if (!mode) {
++ dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
++ m->hdisplay, m->vdisplay, m->vrefresh);
++ continue;
++ }
++
++ mode->type |= DRM_MODE_TYPE_DRIVER;
++
++ if (i == 0)
++ mode->type |= DRM_MODE_TYPE_PREFERRED;
++
++ drm_mode_set_name(mode);
++
++ drm_mode_probed_add(connector, mode);
++ num++;
++ }
++
++ connector->display_info.bpc = 8;
++ connector->display_info.width_mm = 154;
++ connector->display_info.height_mm = 86;
++
++ return num;
++}
++
++static const struct drm_panel_funcs rpi_touchscreen_funcs = {
++ .disable = rpi_touchscreen_disable,
++ .unprepare = rpi_touchscreen_noop,
++ .prepare = rpi_touchscreen_noop,
++ .enable = rpi_touchscreen_enable,
++ .get_modes = rpi_touchscreen_get_modes,
++};
++
++static struct i2c_client *rpi_touchscreen_get_i2c(struct device *dev,
++ const char *name)
++{
++ struct device_node *node;
++ struct i2c_client *client;
++
++ node = of_parse_phandle(dev->of_node, name, 0);
++ if (!node)
++ return ERR_PTR(-ENODEV);
++
++ client = of_find_i2c_device_by_node(node);
++
++ of_node_put(node);
++
++ return client;
++}
++
++static int rpi_touchscreen_dsi_probe(struct mipi_dsi_device *dsi)
++{
++ struct device *dev = &dsi->dev;
++ struct rpi_touchscreen *ts;
++ int ret, ver;
++
++ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
++ if (!ts)
++ return -ENOMEM;
++
++ dev_set_drvdata(dev, ts);
++
++ ts->dsi = dsi;
++ dsi->mode_flags = (MIPI_DSI_MODE_VIDEO |
++ MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
++ MIPI_DSI_MODE_LPM);
++ dsi->format = MIPI_DSI_FMT_RGB888;
++ dsi->lanes = 1;
++
++ ts->bridge_i2c =
++ rpi_touchscreen_get_i2c(dev, "raspberrypi,touchscreen-bridge");
++ if (IS_ERR(ts->bridge_i2c)) {
++ ret = -EPROBE_DEFER;
++ return ret;
++ }
++
++ ver = rpi_touchscreen_i2c_read(ts, REG_ID);
++ if (ver < 0) {
++ dev_err(dev, "Atmel I2C read failed: %d\n", ver);
++ return -ENODEV;
++ }
++
++ switch (ver) {
++ case 0xde:
++ ts->atmel_ver = 1;
++ break;
++ case 0xc3:
++ ts->atmel_ver = 2;
++ break;
++ default:
++ dev_err(dev, "Unknown Atmel firmware revision: 0x%02x\n", ver);
++ return -ENODEV;
++ }
++
++ /* Turn off at boot, so we can cleanly sequence powering on. */
++ rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
++
++ drm_panel_init(&ts->base);
++ ts->base.dev = dev;
++ ts->base.funcs = &rpi_touchscreen_funcs;
++
++ ret = drm_panel_add(&ts->base);
++ if (ret < 0)
++ goto err_release_bridge;
++
++ return mipi_dsi_attach(dsi);
++
++err_release_bridge:
++ put_device(&ts->bridge_i2c->dev);
++ return ret;
++}
++
++static int rpi_touchscreen_dsi_remove(struct mipi_dsi_device *dsi)
++{
++ struct device *dev = &dsi->dev;
++ struct rpi_touchscreen *ts = dev_get_drvdata(dev);
++ int ret;
++
++ ret = mipi_dsi_detach(dsi);
++ if (ret < 0) {
++ dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
++ return ret;
++ }
++
++ drm_panel_detach(&ts->base);
++ drm_panel_remove(&ts->base);
++
++ put_device(&ts->bridge_i2c->dev);
++
++ return 0;
++}
++
++static void rpi_touchscreen_dsi_shutdown(struct mipi_dsi_device *dsi)
++{
++ struct device *dev = &dsi->dev;
++ struct rpi_touchscreen *ts = dev_get_drvdata(dev);
++
++ rpi_touchscreen_i2c_write(ts, REG_POWERON, 0);
++}
++
++static const struct of_device_id rpi_touchscreen_of_match[] = {
++ { .compatible = "raspberrypi,touchscreen" },
++ { } /* sentinel */
++};
++MODULE_DEVICE_TABLE(of, rpi_touchscreen_of_match);
++
++static struct mipi_dsi_driver rpi_touchscreen_driver = {
++ .driver = {
++ .name = "raspberrypi-touchscreen",
++ .of_match_table = rpi_touchscreen_of_match,
++ },
++ .probe = rpi_touchscreen_dsi_probe,
++ .remove = rpi_touchscreen_dsi_remove,
++ .shutdown = rpi_touchscreen_dsi_shutdown,
++};
++module_mipi_dsi_driver(rpi_touchscreen_driver);
++
++MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
++MODULE_DESCRIPTION("Raspberry Pi 7-inch touchscreen driver");
++MODULE_LICENSE("GPL v2");