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838 lines
25 KiB
838 lines
25 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Gmux driver for Apple laptops |
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* |
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* Copyright (C) Canonical Ltd. <[email protected]> |
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* Copyright (C) 2010-2012 Andreas Heider <[email protected]> |
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* Copyright (C) 2015 Lukas Wunner <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/backlight.h> |
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#include <linux/acpi.h> |
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#include <linux/pnp.h> |
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#include <linux/apple_bl.h> |
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#include <linux/apple-gmux.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/pci.h> |
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#include <linux/vga_switcheroo.h> |
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#include <acpi/video.h> |
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#include <asm/io.h> |
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/** |
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* DOC: Overview |
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* |
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* gmux is a microcontroller built into the MacBook Pro to support dual GPUs: |
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* A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on retinas. |
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* |
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* (The MacPro6,1 2013 also has a gmux, however it is unclear why since it has |
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* dual GPUs but no built-in display.) |
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* |
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* gmux is connected to the LPC bus of the southbridge. Its I/O ports are |
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* accessed differently depending on the microcontroller: Driver functions |
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* to access a pre-retina gmux are infixed ``_pio_``, those for a retina gmux |
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* are infixed ``_index_``. |
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* |
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* .. _Lattice XP2: |
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* http://www.latticesemi.com/en/Products/FPGAandCPLD/LatticeXP2.aspx |
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* .. _Renesas R4F2113: |
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* http://www.renesas.com/products/mpumcu/h8s/h8s2100/h8s2113/index.jsp |
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*/ |
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struct apple_gmux_data { |
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unsigned long iostart; |
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unsigned long iolen; |
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bool indexed; |
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struct mutex index_lock; |
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struct backlight_device *bdev; |
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/* switcheroo data */ |
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acpi_handle dhandle; |
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int gpe; |
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bool external_switchable; |
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enum vga_switcheroo_client_id switch_state_display; |
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enum vga_switcheroo_client_id switch_state_ddc; |
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enum vga_switcheroo_client_id switch_state_external; |
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enum vga_switcheroo_state power_state; |
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struct completion powerchange_done; |
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}; |
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static struct apple_gmux_data *apple_gmux_data; |
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/* |
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* gmux port offsets. Many of these are not yet used, but may be in the |
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* future, and it's useful to have them documented here anyhow. |
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*/ |
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#define GMUX_PORT_VERSION_MAJOR 0x04 |
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#define GMUX_PORT_VERSION_MINOR 0x05 |
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#define GMUX_PORT_VERSION_RELEASE 0x06 |
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#define GMUX_PORT_SWITCH_DISPLAY 0x10 |
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#define GMUX_PORT_SWITCH_GET_DISPLAY 0x11 |
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#define GMUX_PORT_INTERRUPT_ENABLE 0x14 |
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#define GMUX_PORT_INTERRUPT_STATUS 0x16 |
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#define GMUX_PORT_SWITCH_DDC 0x28 |
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#define GMUX_PORT_SWITCH_EXTERNAL 0x40 |
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#define GMUX_PORT_SWITCH_GET_EXTERNAL 0x41 |
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#define GMUX_PORT_DISCRETE_POWER 0x50 |
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#define GMUX_PORT_MAX_BRIGHTNESS 0x70 |
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#define GMUX_PORT_BRIGHTNESS 0x74 |
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#define GMUX_PORT_VALUE 0xc2 |
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#define GMUX_PORT_READ 0xd0 |
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#define GMUX_PORT_WRITE 0xd4 |
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#define GMUX_MIN_IO_LEN (GMUX_PORT_BRIGHTNESS + 4) |
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#define GMUX_INTERRUPT_ENABLE 0xff |
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#define GMUX_INTERRUPT_DISABLE 0x00 |
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#define GMUX_INTERRUPT_STATUS_ACTIVE 0 |
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#define GMUX_INTERRUPT_STATUS_DISPLAY (1 << 0) |
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#define GMUX_INTERRUPT_STATUS_POWER (1 << 2) |
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#define GMUX_INTERRUPT_STATUS_HOTPLUG (1 << 3) |
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#define GMUX_BRIGHTNESS_MASK 0x00ffffff |
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#define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK |
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static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port) |
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{ |
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return inb(gmux_data->iostart + port); |
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} |
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static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port, |
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u8 val) |
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{ |
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outb(val, gmux_data->iostart + port); |
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} |
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static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port) |
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{ |
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return inl(gmux_data->iostart + port); |
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} |
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static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port, |
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u32 val) |
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{ |
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int i; |
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u8 tmpval; |
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for (i = 0; i < 4; i++) { |
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tmpval = (val >> (i * 8)) & 0xff; |
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outb(tmpval, gmux_data->iostart + port + i); |
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} |
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} |
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static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data) |
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{ |
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int i = 200; |
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u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
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while (i && (gwr & 0x01)) { |
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inb(gmux_data->iostart + GMUX_PORT_READ); |
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gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
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udelay(100); |
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i--; |
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} |
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return !!i; |
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} |
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static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data) |
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{ |
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int i = 200; |
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u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
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while (i && !(gwr & 0x01)) { |
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gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); |
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udelay(100); |
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i--; |
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} |
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if (gwr & 0x01) |
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inb(gmux_data->iostart + GMUX_PORT_READ); |
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return !!i; |
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} |
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static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port) |
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{ |
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u8 val; |
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mutex_lock(&gmux_data->index_lock); |
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gmux_index_wait_ready(gmux_data); |
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outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
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gmux_index_wait_complete(gmux_data); |
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val = inb(gmux_data->iostart + GMUX_PORT_VALUE); |
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mutex_unlock(&gmux_data->index_lock); |
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return val; |
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} |
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static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port, |
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u8 val) |
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{ |
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mutex_lock(&gmux_data->index_lock); |
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outb(val, gmux_data->iostart + GMUX_PORT_VALUE); |
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gmux_index_wait_ready(gmux_data); |
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outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); |
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gmux_index_wait_complete(gmux_data); |
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mutex_unlock(&gmux_data->index_lock); |
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} |
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static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port) |
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{ |
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u32 val; |
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mutex_lock(&gmux_data->index_lock); |
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gmux_index_wait_ready(gmux_data); |
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outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
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gmux_index_wait_complete(gmux_data); |
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val = inl(gmux_data->iostart + GMUX_PORT_VALUE); |
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mutex_unlock(&gmux_data->index_lock); |
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return val; |
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} |
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static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port, |
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u32 val) |
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{ |
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int i; |
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u8 tmpval; |
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mutex_lock(&gmux_data->index_lock); |
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for (i = 0; i < 4; i++) { |
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tmpval = (val >> (i * 8)) & 0xff; |
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outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i); |
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} |
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gmux_index_wait_ready(gmux_data); |
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outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); |
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gmux_index_wait_complete(gmux_data); |
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mutex_unlock(&gmux_data->index_lock); |
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} |
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static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port) |
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{ |
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if (gmux_data->indexed) |
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return gmux_index_read8(gmux_data, port); |
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else |
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return gmux_pio_read8(gmux_data, port); |
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} |
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static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val) |
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{ |
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if (gmux_data->indexed) |
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gmux_index_write8(gmux_data, port, val); |
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else |
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gmux_pio_write8(gmux_data, port, val); |
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} |
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static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port) |
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{ |
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if (gmux_data->indexed) |
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return gmux_index_read32(gmux_data, port); |
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else |
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return gmux_pio_read32(gmux_data, port); |
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} |
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static void gmux_write32(struct apple_gmux_data *gmux_data, int port, |
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u32 val) |
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{ |
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if (gmux_data->indexed) |
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gmux_index_write32(gmux_data, port, val); |
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else |
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gmux_pio_write32(gmux_data, port, val); |
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} |
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static bool gmux_is_indexed(struct apple_gmux_data *gmux_data) |
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{ |
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u16 val; |
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outb(0xaa, gmux_data->iostart + 0xcc); |
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outb(0x55, gmux_data->iostart + 0xcd); |
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outb(0x00, gmux_data->iostart + 0xce); |
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val = inb(gmux_data->iostart + 0xcc) | |
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(inb(gmux_data->iostart + 0xcd) << 8); |
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if (val == 0x55aa) |
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return true; |
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return false; |
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} |
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/** |
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* DOC: Backlight control |
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* |
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* On single GPU MacBooks, the PWM signal for the backlight is generated by |
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* the GPU. On dual GPU MacBook Pros by contrast, either GPU may be suspended |
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* to conserve energy. Hence the PWM signal needs to be generated by a separate |
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* backlight driver which is controlled by gmux. The earliest generation |
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* MBP5 2008/09 uses a `TI LP8543`_ backlight driver. All newer models |
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* use a `TI LP8545`_. |
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* |
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* .. _TI LP8543: https://www.ti.com/lit/ds/symlink/lp8543.pdf |
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* .. _TI LP8545: https://www.ti.com/lit/ds/symlink/lp8545.pdf |
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*/ |
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static int gmux_get_brightness(struct backlight_device *bd) |
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{ |
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struct apple_gmux_data *gmux_data = bl_get_data(bd); |
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return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) & |
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GMUX_BRIGHTNESS_MASK; |
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} |
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static int gmux_update_status(struct backlight_device *bd) |
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{ |
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struct apple_gmux_data *gmux_data = bl_get_data(bd); |
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u32 brightness = bd->props.brightness; |
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if (bd->props.state & BL_CORE_SUSPENDED) |
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return 0; |
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gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness); |
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return 0; |
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} |
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static const struct backlight_ops gmux_bl_ops = { |
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.options = BL_CORE_SUSPENDRESUME, |
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.get_brightness = gmux_get_brightness, |
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.update_status = gmux_update_status, |
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}; |
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/** |
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* DOC: Graphics mux |
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* |
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* On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes |
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* either of them to the panel. One of the tricks gmux has up its sleeve is |
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* to lengthen the blanking interval of its output during a switch to |
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* synchronize it with the GPU switched to. This allows for a flicker-free |
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* switch that is imperceptible by the user (`US 8,687,007 B2`_). |
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* |
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* On retinas, muxing is no longer done by gmux itself, but by a separate |
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* chip which is controlled by gmux. The chip is triple sourced, it is |
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* either an `NXP CBTL06142`_, `TI HD3SS212`_ or `Pericom PI3VDP12412`_. |
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* The panel is driven with eDP instead of LVDS since the pixel clock |
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* required for retina resolution exceeds LVDS' limits. |
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* |
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* Pre-retinas are able to switch the panel's DDC pins separately. |
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* This is handled by a `TI SN74LV4066A`_ which is controlled by gmux. |
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* The inactive GPU can thus probe the panel's EDID without switching over |
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* the entire panel. Retinas lack this functionality as the chips used for |
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* eDP muxing are incapable of switching the AUX channel separately (see |
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* the linked data sheets, Pericom would be capable but this is unused). |
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* However the retina panel has the NO_AUX_HANDSHAKE_LINK_TRAINING bit set |
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* in its DPCD, allowing the inactive GPU to skip the AUX handshake and |
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* set up the output with link parameters pre-calibrated by the active GPU. |
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* |
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* The external DP port is only fully switchable on the first two unibody |
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* MacBook Pro generations, MBP5 2008/09 and MBP6 2010. This is done by an |
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* `NXP CBTL06141`_ which is controlled by gmux. It's the predecessor of the |
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* eDP mux on retinas, the difference being support for 2.7 versus 5.4 Gbit/s. |
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* |
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* The following MacBook Pro generations replaced the external DP port with a |
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* combined DP/Thunderbolt port and lost the ability to switch it between GPUs, |
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* connecting it either to the discrete GPU or the Thunderbolt controller. |
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* Oddly enough, while the full port is no longer switchable, AUX and HPD |
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* are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas |
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* MBP8 2011 and MBP9 2012) or two `TI TS3DS10224`_ (on retinas) under the |
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* control of gmux. Since the integrated GPU is missing the main link, |
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* external displays appear to it as phantoms which fail to link-train. |
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* |
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* gmux receives the HPD signal of all display connectors and sends an |
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* interrupt on hotplug. On generations which cannot switch external ports, |
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* the discrete GPU can then be woken to drive the newly connected display. |
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* The ability to switch AUX on these generations could be used to improve |
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* reliability of hotplug detection by having the integrated GPU poll the |
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* ports while the discrete GPU is asleep, but currently we do not make use |
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* of this feature. |
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* |
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* Our switching policy for the external port is that on those generations |
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* which are able to switch it fully, the port is switched together with the |
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* panel when IGD / DIS commands are issued to vga_switcheroo. It is thus |
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* possible to drive e.g. a beamer on battery power with the integrated GPU. |
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* The user may manually switch to the discrete GPU if more performance is |
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* needed. |
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* |
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* On all newer generations, the external port can only be driven by the |
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* discrete GPU. If a display is plugged in while the panel is switched to |
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* the integrated GPU, *both* GPUs will be in use for maximum performance. |
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* To decrease power consumption, the user may manually switch to the |
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* discrete GPU, thereby suspending the integrated GPU. |
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* |
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* gmux' initial switch state on bootup is user configurable via the EFI |
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* variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte, |
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* 1 = IGD, 0 = DIS). Based on this setting, the EFI firmware tells gmux to |
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* switch the panel and the external DP connector and allocates a framebuffer |
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* for the selected GPU. |
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* |
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* .. _US 8,687,007 B2: https://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf |
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* .. _NXP CBTL06141: https://www.nxp.com/documents/data_sheet/CBTL06141.pdf |
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* .. _NXP CBTL06142: https://www.nxp.com/documents/data_sheet/CBTL06141.pdf |
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* .. _TI HD3SS212: https://www.ti.com/lit/ds/symlink/hd3ss212.pdf |
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* .. _Pericom PI3VDP12412: https://www.pericom.com/assets/Datasheets/PI3VDP12412.pdf |
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* .. _TI SN74LV4066A: https://www.ti.com/lit/ds/symlink/sn74lv4066a.pdf |
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* .. _NXP CBTL03062: http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.pdf |
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* .. _TI TS3DS10224: https://www.ti.com/lit/ds/symlink/ts3ds10224.pdf |
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*/ |
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static void gmux_read_switch_state(struct apple_gmux_data *gmux_data) |
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{ |
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if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DDC) == 1) |
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gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD; |
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else |
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gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS; |
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if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2) |
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gmux_data->switch_state_display = VGA_SWITCHEROO_IGD; |
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else |
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gmux_data->switch_state_display = VGA_SWITCHEROO_DIS; |
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if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL) == 2) |
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gmux_data->switch_state_external = VGA_SWITCHEROO_IGD; |
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else |
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gmux_data->switch_state_external = VGA_SWITCHEROO_DIS; |
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} |
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static void gmux_write_switch_state(struct apple_gmux_data *gmux_data) |
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{ |
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if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD) |
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gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 1); |
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else |
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gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 2); |
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if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD) |
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gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2); |
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else |
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gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3); |
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if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD) |
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gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2); |
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else |
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gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); |
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} |
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static int gmux_switchto(enum vga_switcheroo_client_id id) |
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{ |
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apple_gmux_data->switch_state_ddc = id; |
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apple_gmux_data->switch_state_display = id; |
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if (apple_gmux_data->external_switchable) |
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apple_gmux_data->switch_state_external = id; |
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gmux_write_switch_state(apple_gmux_data); |
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return 0; |
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} |
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static int gmux_switch_ddc(enum vga_switcheroo_client_id id) |
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{ |
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enum vga_switcheroo_client_id old_ddc_owner = |
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apple_gmux_data->switch_state_ddc; |
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if (id == old_ddc_owner) |
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return id; |
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pr_debug("Switching DDC from %d to %d\n", old_ddc_owner, id); |
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apple_gmux_data->switch_state_ddc = id; |
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if (id == VGA_SWITCHEROO_IGD) |
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1); |
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else |
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gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2); |
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return old_ddc_owner; |
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} |
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/** |
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* DOC: Power control |
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* |
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* gmux is able to cut power to the discrete GPU. It automatically takes care |
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* of the correct sequence to tear down and bring up the power rails for |
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* core voltage, VRAM and PCIe. |
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*/ |
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static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data, |
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enum vga_switcheroo_state state) |
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{ |
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reinit_completion(&gmux_data->powerchange_done); |
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if (state == VGA_SWITCHEROO_ON) { |
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); |
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3); |
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pr_debug("Discrete card powered up\n"); |
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} else { |
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); |
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gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0); |
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pr_debug("Discrete card powered down\n"); |
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} |
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gmux_data->power_state = state; |
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if (gmux_data->gpe >= 0 && |
|
!wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done, |
|
msecs_to_jiffies(200))) |
|
pr_warn("Timeout waiting for gmux switch to complete\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static int gmux_set_power_state(enum vga_switcheroo_client_id id, |
|
enum vga_switcheroo_state state) |
|
{ |
|
if (id == VGA_SWITCHEROO_IGD) |
|
return 0; |
|
|
|
return gmux_set_discrete_state(apple_gmux_data, state); |
|
} |
|
|
|
static enum vga_switcheroo_client_id gmux_get_client_id(struct pci_dev *pdev) |
|
{ |
|
/* |
|
* Early Macbook Pros with switchable graphics use nvidia |
|
* integrated graphics. Hardcode that the 9400M is integrated. |
|
*/ |
|
if (pdev->vendor == PCI_VENDOR_ID_INTEL) |
|
return VGA_SWITCHEROO_IGD; |
|
else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && |
|
pdev->device == 0x0863) |
|
return VGA_SWITCHEROO_IGD; |
|
else |
|
return VGA_SWITCHEROO_DIS; |
|
} |
|
|
|
static const struct vga_switcheroo_handler gmux_handler_indexed = { |
|
.switchto = gmux_switchto, |
|
.power_state = gmux_set_power_state, |
|
.get_client_id = gmux_get_client_id, |
|
}; |
|
|
|
static const struct vga_switcheroo_handler gmux_handler_classic = { |
|
.switchto = gmux_switchto, |
|
.switch_ddc = gmux_switch_ddc, |
|
.power_state = gmux_set_power_state, |
|
.get_client_id = gmux_get_client_id, |
|
}; |
|
|
|
/** |
|
* DOC: Interrupt |
|
* |
|
* gmux is also connected to a GPIO pin of the southbridge and thereby is able |
|
* to trigger an ACPI GPE. On the MBP5 2008/09 it's GPIO pin 22 of the Nvidia |
|
* MCP79, on all following generations it's GPIO pin 6 of the Intel PCH. |
|
* The GPE merely signals that an interrupt occurred, the actual type of event |
|
* is identified by reading a gmux register. |
|
*/ |
|
|
|
static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data) |
|
{ |
|
gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
|
GMUX_INTERRUPT_DISABLE); |
|
} |
|
|
|
static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data) |
|
{ |
|
gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, |
|
GMUX_INTERRUPT_ENABLE); |
|
} |
|
|
|
static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data) |
|
{ |
|
return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS); |
|
} |
|
|
|
static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data) |
|
{ |
|
u8 status; |
|
|
|
/* to clear interrupts write back current status */ |
|
status = gmux_interrupt_get_status(gmux_data); |
|
gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status); |
|
} |
|
|
|
static void gmux_notify_handler(acpi_handle device, u32 value, void *context) |
|
{ |
|
u8 status; |
|
struct pnp_dev *pnp = (struct pnp_dev *)context; |
|
struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
|
|
|
status = gmux_interrupt_get_status(gmux_data); |
|
gmux_disable_interrupts(gmux_data); |
|
pr_debug("Notify handler called: status %d\n", status); |
|
|
|
gmux_clear_interrupts(gmux_data); |
|
gmux_enable_interrupts(gmux_data); |
|
|
|
if (status & GMUX_INTERRUPT_STATUS_POWER) |
|
complete(&gmux_data->powerchange_done); |
|
} |
|
|
|
static int gmux_suspend(struct device *dev) |
|
{ |
|
struct pnp_dev *pnp = to_pnp_dev(dev); |
|
struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
|
|
|
gmux_disable_interrupts(gmux_data); |
|
return 0; |
|
} |
|
|
|
static int gmux_resume(struct device *dev) |
|
{ |
|
struct pnp_dev *pnp = to_pnp_dev(dev); |
|
struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
|
|
|
gmux_enable_interrupts(gmux_data); |
|
gmux_write_switch_state(gmux_data); |
|
if (gmux_data->power_state == VGA_SWITCHEROO_OFF) |
|
gmux_set_discrete_state(gmux_data, gmux_data->power_state); |
|
return 0; |
|
} |
|
|
|
static int is_thunderbolt(struct device *dev, void *data) |
|
{ |
|
return to_pci_dev(dev)->is_thunderbolt; |
|
} |
|
|
|
static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) |
|
{ |
|
struct apple_gmux_data *gmux_data; |
|
struct resource *res; |
|
struct backlight_properties props; |
|
struct backlight_device *bdev; |
|
u8 ver_major, ver_minor, ver_release; |
|
int ret = -ENXIO; |
|
acpi_status status; |
|
unsigned long long gpe; |
|
|
|
if (apple_gmux_data) |
|
return -EBUSY; |
|
|
|
gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL); |
|
if (!gmux_data) |
|
return -ENOMEM; |
|
pnp_set_drvdata(pnp, gmux_data); |
|
|
|
res = pnp_get_resource(pnp, IORESOURCE_IO, 0); |
|
if (!res) { |
|
pr_err("Failed to find gmux I/O resource\n"); |
|
goto err_free; |
|
} |
|
|
|
gmux_data->iostart = res->start; |
|
gmux_data->iolen = res->end - res->start; |
|
|
|
if (gmux_data->iolen < GMUX_MIN_IO_LEN) { |
|
pr_err("gmux I/O region too small (%lu < %u)\n", |
|
gmux_data->iolen, GMUX_MIN_IO_LEN); |
|
goto err_free; |
|
} |
|
|
|
if (!request_region(gmux_data->iostart, gmux_data->iolen, |
|
"Apple gmux")) { |
|
pr_err("gmux I/O already in use\n"); |
|
goto err_free; |
|
} |
|
|
|
/* |
|
* Invalid version information may indicate either that the gmux |
|
* device isn't present or that it's a new one that uses indexed |
|
* io |
|
*/ |
|
|
|
ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR); |
|
ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR); |
|
ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE); |
|
if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) { |
|
if (gmux_is_indexed(gmux_data)) { |
|
u32 version; |
|
mutex_init(&gmux_data->index_lock); |
|
gmux_data->indexed = true; |
|
version = gmux_read32(gmux_data, |
|
GMUX_PORT_VERSION_MAJOR); |
|
ver_major = (version >> 24) & 0xff; |
|
ver_minor = (version >> 16) & 0xff; |
|
ver_release = (version >> 8) & 0xff; |
|
} else { |
|
pr_info("gmux device not present\n"); |
|
ret = -ENODEV; |
|
goto err_release; |
|
} |
|
} |
|
pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor, |
|
ver_release, (gmux_data->indexed ? "indexed" : "classic")); |
|
|
|
memset(&props, 0, sizeof(props)); |
|
props.type = BACKLIGHT_PLATFORM; |
|
props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); |
|
|
|
/* |
|
* Currently it's assumed that the maximum brightness is less than |
|
* 2^24 for compatibility with old gmux versions. Cap the max |
|
* brightness at this value, but print a warning if the hardware |
|
* reports something higher so that it can be fixed. |
|
*/ |
|
if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS)) |
|
props.max_brightness = GMUX_MAX_BRIGHTNESS; |
|
|
|
bdev = backlight_device_register("gmux_backlight", &pnp->dev, |
|
gmux_data, &gmux_bl_ops, &props); |
|
if (IS_ERR(bdev)) { |
|
ret = PTR_ERR(bdev); |
|
goto err_release; |
|
} |
|
|
|
gmux_data->bdev = bdev; |
|
bdev->props.brightness = gmux_get_brightness(bdev); |
|
backlight_update_status(bdev); |
|
|
|
/* |
|
* The backlight situation on Macs is complicated. If the gmux is |
|
* present it's the best choice, because it always works for |
|
* backlight control and supports more levels than other options. |
|
* Disable the other backlight choices. |
|
*/ |
|
acpi_video_set_dmi_backlight_type(acpi_backlight_vendor); |
|
apple_bl_unregister(); |
|
|
|
gmux_data->power_state = VGA_SWITCHEROO_ON; |
|
|
|
gmux_data->dhandle = ACPI_HANDLE(&pnp->dev); |
|
if (!gmux_data->dhandle) { |
|
pr_err("Cannot find acpi handle for pnp device %s\n", |
|
dev_name(&pnp->dev)); |
|
ret = -ENODEV; |
|
goto err_notify; |
|
} |
|
|
|
status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe); |
|
if (ACPI_SUCCESS(status)) { |
|
gmux_data->gpe = (int)gpe; |
|
|
|
status = acpi_install_notify_handler(gmux_data->dhandle, |
|
ACPI_DEVICE_NOTIFY, |
|
&gmux_notify_handler, pnp); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Install notify handler failed: %s\n", |
|
acpi_format_exception(status)); |
|
ret = -ENODEV; |
|
goto err_notify; |
|
} |
|
|
|
status = acpi_enable_gpe(NULL, gmux_data->gpe); |
|
if (ACPI_FAILURE(status)) { |
|
pr_err("Cannot enable gpe: %s\n", |
|
acpi_format_exception(status)); |
|
goto err_enable_gpe; |
|
} |
|
} else { |
|
pr_warn("No GPE found for gmux\n"); |
|
gmux_data->gpe = -1; |
|
} |
|
|
|
/* |
|
* If Thunderbolt is present, the external DP port is not fully |
|
* switchable. Force its AUX channel to the discrete GPU. |
|
*/ |
|
gmux_data->external_switchable = |
|
!bus_for_each_dev(&pci_bus_type, NULL, NULL, is_thunderbolt); |
|
if (!gmux_data->external_switchable) |
|
gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); |
|
|
|
apple_gmux_data = gmux_data; |
|
init_completion(&gmux_data->powerchange_done); |
|
gmux_enable_interrupts(gmux_data); |
|
gmux_read_switch_state(gmux_data); |
|
|
|
/* |
|
* Retina MacBook Pros cannot switch the panel's AUX separately |
|
* and need eDP pre-calibration. They are distinguishable from |
|
* pre-retinas by having an "indexed" gmux. |
|
* |
|
* Pre-retina MacBook Pros can switch the panel's DDC separately. |
|
*/ |
|
if (gmux_data->indexed) |
|
ret = vga_switcheroo_register_handler(&gmux_handler_indexed, |
|
VGA_SWITCHEROO_NEEDS_EDP_CONFIG); |
|
else |
|
ret = vga_switcheroo_register_handler(&gmux_handler_classic, |
|
VGA_SWITCHEROO_CAN_SWITCH_DDC); |
|
if (ret) { |
|
pr_err("Failed to register vga_switcheroo handler\n"); |
|
goto err_register_handler; |
|
} |
|
|
|
return 0; |
|
|
|
err_register_handler: |
|
gmux_disable_interrupts(gmux_data); |
|
apple_gmux_data = NULL; |
|
if (gmux_data->gpe >= 0) |
|
acpi_disable_gpe(NULL, gmux_data->gpe); |
|
err_enable_gpe: |
|
if (gmux_data->gpe >= 0) |
|
acpi_remove_notify_handler(gmux_data->dhandle, |
|
ACPI_DEVICE_NOTIFY, |
|
&gmux_notify_handler); |
|
err_notify: |
|
backlight_device_unregister(bdev); |
|
err_release: |
|
release_region(gmux_data->iostart, gmux_data->iolen); |
|
err_free: |
|
kfree(gmux_data); |
|
return ret; |
|
} |
|
|
|
static void gmux_remove(struct pnp_dev *pnp) |
|
{ |
|
struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
|
|
|
vga_switcheroo_unregister_handler(); |
|
gmux_disable_interrupts(gmux_data); |
|
if (gmux_data->gpe >= 0) { |
|
acpi_disable_gpe(NULL, gmux_data->gpe); |
|
acpi_remove_notify_handler(gmux_data->dhandle, |
|
ACPI_DEVICE_NOTIFY, |
|
&gmux_notify_handler); |
|
} |
|
|
|
backlight_device_unregister(gmux_data->bdev); |
|
|
|
release_region(gmux_data->iostart, gmux_data->iolen); |
|
apple_gmux_data = NULL; |
|
kfree(gmux_data); |
|
|
|
acpi_video_register(); |
|
apple_bl_register(); |
|
} |
|
|
|
static const struct pnp_device_id gmux_device_ids[] = { |
|
{GMUX_ACPI_HID, 0}, |
|
{"", 0} |
|
}; |
|
|
|
static const struct dev_pm_ops gmux_dev_pm_ops = { |
|
.suspend = gmux_suspend, |
|
.resume = gmux_resume, |
|
}; |
|
|
|
static struct pnp_driver gmux_pnp_driver = { |
|
.name = "apple-gmux", |
|
.probe = gmux_probe, |
|
.remove = gmux_remove, |
|
.id_table = gmux_device_ids, |
|
.driver = { |
|
.pm = &gmux_dev_pm_ops, |
|
}, |
|
}; |
|
|
|
module_pnp_driver(gmux_pnp_driver); |
|
MODULE_AUTHOR("Seth Forshee <[email protected]>"); |
|
MODULE_DESCRIPTION("Apple Gmux Driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DEVICE_TABLE(pnp, gmux_device_ids);
|
|
|