diff options
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.patch | 576 |
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"); |