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917ee75a SF |
1 | /* |
2 | * Gmux driver for Apple laptops | |
3 | * | |
4 | * Copyright (C) Canonical Ltd. <seth.forshee@canonical.com> | |
76b487dd | 5 | * Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de> |
3d7b75fd | 6 | * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de> |
917ee75a SF |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/backlight.h> | |
19 | #include <linux/acpi.h> | |
20 | #include <linux/pnp.h> | |
21 | #include <linux/apple_bl.h> | |
2413306c | 22 | #include <linux/apple-gmux.h> |
917ee75a | 23 | #include <linux/slab.h> |
96ff7056 | 24 | #include <linux/delay.h> |
76b487dd AH |
25 | #include <linux/pci.h> |
26 | #include <linux/vga_switcheroo.h> | |
917ee75a SF |
27 | #include <acpi/video.h> |
28 | #include <asm/io.h> | |
29 | ||
3d7b75fd LW |
30 | /** |
31 | * DOC: Overview | |
32 | * | |
3d7b75fd | 33 | * gmux is a microcontroller built into the MacBook Pro to support dual GPUs: |
305964b7 | 34 | * A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on retinas. |
3d7b75fd LW |
35 | * |
36 | * (The MacPro6,1 2013 also has a gmux, however it is unclear why since it has | |
37 | * dual GPUs but no built-in display.) | |
38 | * | |
39 | * gmux is connected to the LPC bus of the southbridge. Its I/O ports are | |
40 | * accessed differently depending on the microcontroller: Driver functions | |
305964b7 LW |
41 | * to access a pre-retina gmux are infixed ``_pio_``, those for a retina gmux |
42 | * are infixed ``_index_``. | |
43 | * | |
44 | * .. _Lattice XP2: | |
45 | * http://www.latticesemi.com/en/Products/FPGAandCPLD/LatticeXP2.aspx | |
46 | * .. _Renesas R4F2113: | |
47 | * http://www.renesas.com/products/mpumcu/h8s/h8s2100/h8s2113/index.jsp | |
3d7b75fd LW |
48 | */ |
49 | ||
917ee75a SF |
50 | struct apple_gmux_data { |
51 | unsigned long iostart; | |
52 | unsigned long iolen; | |
96ff7056 MG |
53 | bool indexed; |
54 | struct mutex index_lock; | |
917ee75a SF |
55 | |
56 | struct backlight_device *bdev; | |
76b487dd AH |
57 | |
58 | /* switcheroo data */ | |
59 | acpi_handle dhandle; | |
60 | int gpe; | |
b121b051 | 61 | bool external_switchable; |
3e46304e LW |
62 | enum vga_switcheroo_client_id switch_state_display; |
63 | enum vga_switcheroo_client_id switch_state_ddc; | |
64 | enum vga_switcheroo_client_id switch_state_external; | |
76b487dd AH |
65 | enum vga_switcheroo_state power_state; |
66 | struct completion powerchange_done; | |
917ee75a SF |
67 | }; |
68 | ||
76b487dd AH |
69 | static struct apple_gmux_data *apple_gmux_data; |
70 | ||
917ee75a SF |
71 | /* |
72 | * gmux port offsets. Many of these are not yet used, but may be in the | |
73 | * future, and it's useful to have them documented here anyhow. | |
74 | */ | |
75 | #define GMUX_PORT_VERSION_MAJOR 0x04 | |
76 | #define GMUX_PORT_VERSION_MINOR 0x05 | |
77 | #define GMUX_PORT_VERSION_RELEASE 0x06 | |
78 | #define GMUX_PORT_SWITCH_DISPLAY 0x10 | |
79 | #define GMUX_PORT_SWITCH_GET_DISPLAY 0x11 | |
80 | #define GMUX_PORT_INTERRUPT_ENABLE 0x14 | |
81 | #define GMUX_PORT_INTERRUPT_STATUS 0x16 | |
82 | #define GMUX_PORT_SWITCH_DDC 0x28 | |
83 | #define GMUX_PORT_SWITCH_EXTERNAL 0x40 | |
84 | #define GMUX_PORT_SWITCH_GET_EXTERNAL 0x41 | |
85 | #define GMUX_PORT_DISCRETE_POWER 0x50 | |
86 | #define GMUX_PORT_MAX_BRIGHTNESS 0x70 | |
87 | #define GMUX_PORT_BRIGHTNESS 0x74 | |
96ff7056 MG |
88 | #define GMUX_PORT_VALUE 0xc2 |
89 | #define GMUX_PORT_READ 0xd0 | |
90 | #define GMUX_PORT_WRITE 0xd4 | |
917ee75a SF |
91 | |
92 | #define GMUX_MIN_IO_LEN (GMUX_PORT_BRIGHTNESS + 4) | |
93 | ||
94 | #define GMUX_INTERRUPT_ENABLE 0xff | |
95 | #define GMUX_INTERRUPT_DISABLE 0x00 | |
96 | ||
97 | #define GMUX_INTERRUPT_STATUS_ACTIVE 0 | |
98 | #define GMUX_INTERRUPT_STATUS_DISPLAY (1 << 0) | |
99 | #define GMUX_INTERRUPT_STATUS_POWER (1 << 2) | |
100 | #define GMUX_INTERRUPT_STATUS_HOTPLUG (1 << 3) | |
101 | ||
102 | #define GMUX_BRIGHTNESS_MASK 0x00ffffff | |
103 | #define GMUX_MAX_BRIGHTNESS GMUX_BRIGHTNESS_MASK | |
104 | ||
96ff7056 | 105 | static u8 gmux_pio_read8(struct apple_gmux_data *gmux_data, int port) |
917ee75a SF |
106 | { |
107 | return inb(gmux_data->iostart + port); | |
108 | } | |
109 | ||
96ff7056 | 110 | static void gmux_pio_write8(struct apple_gmux_data *gmux_data, int port, |
917ee75a SF |
111 | u8 val) |
112 | { | |
113 | outb(val, gmux_data->iostart + port); | |
114 | } | |
115 | ||
96ff7056 | 116 | static u32 gmux_pio_read32(struct apple_gmux_data *gmux_data, int port) |
917ee75a SF |
117 | { |
118 | return inl(gmux_data->iostart + port); | |
119 | } | |
120 | ||
96ff7056 MG |
121 | static void gmux_pio_write32(struct apple_gmux_data *gmux_data, int port, |
122 | u32 val) | |
7e30ed6b MG |
123 | { |
124 | int i; | |
125 | u8 tmpval; | |
126 | ||
127 | for (i = 0; i < 4; i++) { | |
128 | tmpval = (val >> (i * 8)) & 0xff; | |
e6d9d3d5 | 129 | outb(tmpval, gmux_data->iostart + port + i); |
7e30ed6b MG |
130 | } |
131 | } | |
132 | ||
96ff7056 MG |
133 | static int gmux_index_wait_ready(struct apple_gmux_data *gmux_data) |
134 | { | |
135 | int i = 200; | |
136 | u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); | |
137 | ||
138 | while (i && (gwr & 0x01)) { | |
139 | inb(gmux_data->iostart + GMUX_PORT_READ); | |
140 | gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); | |
141 | udelay(100); | |
142 | i--; | |
143 | } | |
144 | ||
145 | return !!i; | |
146 | } | |
147 | ||
148 | static int gmux_index_wait_complete(struct apple_gmux_data *gmux_data) | |
149 | { | |
150 | int i = 200; | |
151 | u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); | |
152 | ||
153 | while (i && !(gwr & 0x01)) { | |
154 | gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE); | |
155 | udelay(100); | |
156 | i--; | |
157 | } | |
158 | ||
159 | if (gwr & 0x01) | |
160 | inb(gmux_data->iostart + GMUX_PORT_READ); | |
161 | ||
162 | return !!i; | |
163 | } | |
164 | ||
165 | static u8 gmux_index_read8(struct apple_gmux_data *gmux_data, int port) | |
166 | { | |
167 | u8 val; | |
168 | ||
169 | mutex_lock(&gmux_data->index_lock); | |
96ff7056 | 170 | gmux_index_wait_ready(gmux_data); |
c5a50529 BF |
171 | outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
172 | gmux_index_wait_complete(gmux_data); | |
96ff7056 MG |
173 | val = inb(gmux_data->iostart + GMUX_PORT_VALUE); |
174 | mutex_unlock(&gmux_data->index_lock); | |
175 | ||
176 | return val; | |
177 | } | |
178 | ||
179 | static void gmux_index_write8(struct apple_gmux_data *gmux_data, int port, | |
180 | u8 val) | |
181 | { | |
182 | mutex_lock(&gmux_data->index_lock); | |
183 | outb(val, gmux_data->iostart + GMUX_PORT_VALUE); | |
184 | gmux_index_wait_ready(gmux_data); | |
185 | outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); | |
186 | gmux_index_wait_complete(gmux_data); | |
187 | mutex_unlock(&gmux_data->index_lock); | |
188 | } | |
189 | ||
190 | static u32 gmux_index_read32(struct apple_gmux_data *gmux_data, int port) | |
191 | { | |
192 | u32 val; | |
193 | ||
194 | mutex_lock(&gmux_data->index_lock); | |
96ff7056 | 195 | gmux_index_wait_ready(gmux_data); |
c5a50529 BF |
196 | outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ); |
197 | gmux_index_wait_complete(gmux_data); | |
96ff7056 MG |
198 | val = inl(gmux_data->iostart + GMUX_PORT_VALUE); |
199 | mutex_unlock(&gmux_data->index_lock); | |
200 | ||
201 | return val; | |
202 | } | |
203 | ||
204 | static void gmux_index_write32(struct apple_gmux_data *gmux_data, int port, | |
205 | u32 val) | |
206 | { | |
207 | int i; | |
208 | u8 tmpval; | |
209 | ||
210 | mutex_lock(&gmux_data->index_lock); | |
211 | ||
212 | for (i = 0; i < 4; i++) { | |
213 | tmpval = (val >> (i * 8)) & 0xff; | |
214 | outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i); | |
215 | } | |
216 | ||
217 | gmux_index_wait_ready(gmux_data); | |
218 | outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE); | |
219 | gmux_index_wait_complete(gmux_data); | |
220 | mutex_unlock(&gmux_data->index_lock); | |
221 | } | |
222 | ||
223 | static u8 gmux_read8(struct apple_gmux_data *gmux_data, int port) | |
224 | { | |
225 | if (gmux_data->indexed) | |
226 | return gmux_index_read8(gmux_data, port); | |
227 | else | |
228 | return gmux_pio_read8(gmux_data, port); | |
229 | } | |
230 | ||
231 | static void gmux_write8(struct apple_gmux_data *gmux_data, int port, u8 val) | |
232 | { | |
233 | if (gmux_data->indexed) | |
234 | gmux_index_write8(gmux_data, port, val); | |
235 | else | |
236 | gmux_pio_write8(gmux_data, port, val); | |
237 | } | |
238 | ||
239 | static u32 gmux_read32(struct apple_gmux_data *gmux_data, int port) | |
240 | { | |
241 | if (gmux_data->indexed) | |
242 | return gmux_index_read32(gmux_data, port); | |
243 | else | |
244 | return gmux_pio_read32(gmux_data, port); | |
245 | } | |
246 | ||
247 | static void gmux_write32(struct apple_gmux_data *gmux_data, int port, | |
248 | u32 val) | |
249 | { | |
250 | if (gmux_data->indexed) | |
251 | gmux_index_write32(gmux_data, port, val); | |
252 | else | |
253 | gmux_pio_write32(gmux_data, port, val); | |
254 | } | |
255 | ||
256 | static bool gmux_is_indexed(struct apple_gmux_data *gmux_data) | |
257 | { | |
258 | u16 val; | |
259 | ||
260 | outb(0xaa, gmux_data->iostart + 0xcc); | |
261 | outb(0x55, gmux_data->iostart + 0xcd); | |
262 | outb(0x00, gmux_data->iostart + 0xce); | |
263 | ||
264 | val = inb(gmux_data->iostart + 0xcc) | | |
265 | (inb(gmux_data->iostart + 0xcd) << 8); | |
266 | ||
267 | if (val == 0x55aa) | |
268 | return true; | |
269 | ||
270 | return false; | |
271 | } | |
272 | ||
3d7b75fd LW |
273 | /** |
274 | * DOC: Backlight control | |
275 | * | |
3d7b75fd LW |
276 | * On single GPU MacBooks, the PWM signal for the backlight is generated by |
277 | * the GPU. On dual GPU MacBook Pros by contrast, either GPU may be suspended | |
278 | * to conserve energy. Hence the PWM signal needs to be generated by a separate | |
279 | * backlight driver which is controlled by gmux. The earliest generation | |
305964b7 LW |
280 | * MBP5 2008/09 uses a `TI LP8543`_ backlight driver. All newer models |
281 | * use a `TI LP8545`_. | |
282 | * | |
283 | * .. _TI LP8543: http://www.ti.com/lit/ds/symlink/lp8543.pdf | |
284 | * .. _TI LP8545: http://www.ti.com/lit/ds/symlink/lp8545.pdf | |
3d7b75fd LW |
285 | */ |
286 | ||
917ee75a SF |
287 | static int gmux_get_brightness(struct backlight_device *bd) |
288 | { | |
289 | struct apple_gmux_data *gmux_data = bl_get_data(bd); | |
290 | return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) & | |
291 | GMUX_BRIGHTNESS_MASK; | |
292 | } | |
293 | ||
294 | static int gmux_update_status(struct backlight_device *bd) | |
295 | { | |
296 | struct apple_gmux_data *gmux_data = bl_get_data(bd); | |
297 | u32 brightness = bd->props.brightness; | |
298 | ||
96960880 | 299 | if (bd->props.state & BL_CORE_SUSPENDED) |
a2f01a89 | 300 | return 0; |
96960880 | 301 | |
7e30ed6b | 302 | gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness); |
917ee75a SF |
303 | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static const struct backlight_ops gmux_bl_ops = { | |
96960880 | 308 | .options = BL_CORE_SUSPENDRESUME, |
917ee75a SF |
309 | .get_brightness = gmux_get_brightness, |
310 | .update_status = gmux_update_status, | |
311 | }; | |
312 | ||
3d7b75fd LW |
313 | /** |
314 | * DOC: Graphics mux | |
315 | * | |
3d7b75fd LW |
316 | * On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes |
317 | * either of them to the panel. One of the tricks gmux has up its sleeve is | |
318 | * to lengthen the blanking interval of its output during a switch to | |
319 | * synchronize it with the GPU switched to. This allows for a flicker-free | |
305964b7 | 320 | * switch that is imperceptible by the user (`US 8,687,007 B2`_). |
3d7b75fd LW |
321 | * |
322 | * On retinas, muxing is no longer done by gmux itself, but by a separate | |
323 | * chip which is controlled by gmux. The chip is triple sourced, it is | |
305964b7 | 324 | * either an `NXP CBTL06142`_, `TI HD3SS212`_ or `Pericom PI3VDP12412`_. |
3d7b75fd LW |
325 | * The panel is driven with eDP instead of LVDS since the pixel clock |
326 | * required for retina resolution exceeds LVDS' limits. | |
327 | * | |
328 | * Pre-retinas are able to switch the panel's DDC pins separately. | |
305964b7 | 329 | * This is handled by a `TI SN74LV4066A`_ which is controlled by gmux. |
3d7b75fd LW |
330 | * The inactive GPU can thus probe the panel's EDID without switching over |
331 | * the entire panel. Retinas lack this functionality as the chips used for | |
332 | * eDP muxing are incapable of switching the AUX channel separately (see | |
333 | * the linked data sheets, Pericom would be capable but this is unused). | |
334 | * However the retina panel has the NO_AUX_HANDSHAKE_LINK_TRAINING bit set | |
335 | * in its DPCD, allowing the inactive GPU to skip the AUX handshake and | |
336 | * set up the output with link parameters pre-calibrated by the active GPU. | |
337 | * | |
338 | * The external DP port is only fully switchable on the first two unibody | |
339 | * MacBook Pro generations, MBP5 2008/09 and MBP6 2010. This is done by an | |
305964b7 | 340 | * `NXP CBTL06141`_ which is controlled by gmux. It's the predecessor of the |
3d7b75fd LW |
341 | * eDP mux on retinas, the difference being support for 2.7 versus 5.4 Gbit/s. |
342 | * | |
343 | * The following MacBook Pro generations replaced the external DP port with a | |
344 | * combined DP/Thunderbolt port and lost the ability to switch it between GPUs, | |
345 | * connecting it either to the discrete GPU or the Thunderbolt controller. | |
346 | * Oddly enough, while the full port is no longer switchable, AUX and HPD | |
305964b7 LW |
347 | * are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas |
348 | * MBP8 2011 and MBP9 2012) or two `TI TS3DS10224`_ (on retinas) under the | |
3d7b75fd LW |
349 | * control of gmux. Since the integrated GPU is missing the main link, |
350 | * external displays appear to it as phantoms which fail to link-train. | |
351 | * | |
352 | * gmux receives the HPD signal of all display connectors and sends an | |
353 | * interrupt on hotplug. On generations which cannot switch external ports, | |
354 | * the discrete GPU can then be woken to drive the newly connected display. | |
355 | * The ability to switch AUX on these generations could be used to improve | |
356 | * reliability of hotplug detection by having the integrated GPU poll the | |
357 | * ports while the discrete GPU is asleep, but currently we do not make use | |
358 | * of this feature. | |
359 | * | |
b121b051 LW |
360 | * Our switching policy for the external port is that on those generations |
361 | * which are able to switch it fully, the port is switched together with the | |
362 | * panel when IGD / DIS commands are issued to vga_switcheroo. It is thus | |
363 | * possible to drive e.g. a beamer on battery power with the integrated GPU. | |
364 | * The user may manually switch to the discrete GPU if more performance is | |
365 | * needed. | |
366 | * | |
367 | * On all newer generations, the external port can only be driven by the | |
368 | * discrete GPU. If a display is plugged in while the panel is switched to | |
369 | * the integrated GPU, *both* GPUs will be in use for maximum performance. | |
370 | * To decrease power consumption, the user may manually switch to the | |
371 | * discrete GPU, thereby suspending the integrated GPU. | |
372 | * | |
3d7b75fd | 373 | * gmux' initial switch state on bootup is user configurable via the EFI |
305964b7 | 374 | * variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte, |
3d7b75fd LW |
375 | * 1 = IGD, 0 = DIS). Based on this setting, the EFI firmware tells gmux to |
376 | * switch the panel and the external DP connector and allocates a framebuffer | |
377 | * for the selected GPU. | |
305964b7 LW |
378 | * |
379 | * .. _US 8,687,007 B2: http://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf | |
380 | * .. _NXP CBTL06141: http://www.nxp.com/documents/data_sheet/CBTL06141.pdf | |
381 | * .. _NXP CBTL06142: http://www.nxp.com/documents/data_sheet/CBTL06141.pdf | |
382 | * .. _TI HD3SS212: http://www.ti.com/lit/ds/symlink/hd3ss212.pdf | |
383 | * .. _Pericom PI3VDP12412: https://www.pericom.com/assets/Datasheets/PI3VDP12412.pdf | |
384 | * .. _TI SN74LV4066A: http://www.ti.com/lit/ds/symlink/sn74lv4066a.pdf | |
385 | * .. _NXP CBTL03062: http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.pdf | |
386 | * .. _TI TS3DS10224: http://www.ti.com/lit/ds/symlink/ts3ds10224.pdf | |
3d7b75fd LW |
387 | */ |
388 | ||
3e46304e LW |
389 | static void gmux_read_switch_state(struct apple_gmux_data *gmux_data) |
390 | { | |
391 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DDC) == 1) | |
392 | gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD; | |
393 | else | |
394 | gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS; | |
395 | ||
396 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_DISPLAY) == 2) | |
397 | gmux_data->switch_state_display = VGA_SWITCHEROO_IGD; | |
398 | else | |
399 | gmux_data->switch_state_display = VGA_SWITCHEROO_DIS; | |
400 | ||
401 | if (gmux_read8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL) == 2) | |
402 | gmux_data->switch_state_external = VGA_SWITCHEROO_IGD; | |
403 | else | |
404 | gmux_data->switch_state_external = VGA_SWITCHEROO_DIS; | |
405 | } | |
406 | ||
407 | static void gmux_write_switch_state(struct apple_gmux_data *gmux_data) | |
408 | { | |
409 | if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD) | |
410 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 1); | |
411 | else | |
412 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DDC, 2); | |
413 | ||
414 | if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD) | |
415 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 2); | |
416 | else | |
417 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_DISPLAY, 3); | |
418 | ||
419 | if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD) | |
420 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 2); | |
421 | else | |
422 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); | |
423 | } | |
424 | ||
76b487dd AH |
425 | static int gmux_switchto(enum vga_switcheroo_client_id id) |
426 | { | |
3e46304e LW |
427 | apple_gmux_data->switch_state_ddc = id; |
428 | apple_gmux_data->switch_state_display = id; | |
b121b051 LW |
429 | if (apple_gmux_data->external_switchable) |
430 | apple_gmux_data->switch_state_external = id; | |
3e46304e LW |
431 | |
432 | gmux_write_switch_state(apple_gmux_data); | |
76b487dd AH |
433 | |
434 | return 0; | |
435 | } | |
436 | ||
f798d965 LW |
437 | static int gmux_switch_ddc(enum vga_switcheroo_client_id id) |
438 | { | |
439 | enum vga_switcheroo_client_id old_ddc_owner = | |
440 | apple_gmux_data->switch_state_ddc; | |
441 | ||
442 | if (id == old_ddc_owner) | |
443 | return id; | |
444 | ||
445 | pr_debug("Switching DDC from %d to %d\n", old_ddc_owner, id); | |
446 | apple_gmux_data->switch_state_ddc = id; | |
447 | ||
448 | if (id == VGA_SWITCHEROO_IGD) | |
449 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1); | |
450 | else | |
451 | gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2); | |
452 | ||
453 | return old_ddc_owner; | |
454 | } | |
455 | ||
3d7b75fd LW |
456 | /** |
457 | * DOC: Power control | |
458 | * | |
459 | * gmux is able to cut power to the discrete GPU. It automatically takes care | |
460 | * of the correct sequence to tear down and bring up the power rails for | |
461 | * core voltage, VRAM and PCIe. | |
462 | */ | |
463 | ||
76b487dd AH |
464 | static int gmux_set_discrete_state(struct apple_gmux_data *gmux_data, |
465 | enum vga_switcheroo_state state) | |
466 | { | |
16735d02 | 467 | reinit_completion(&gmux_data->powerchange_done); |
76b487dd AH |
468 | |
469 | if (state == VGA_SWITCHEROO_ON) { | |
470 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); | |
471 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 3); | |
472 | pr_debug("Discrete card powered up\n"); | |
473 | } else { | |
474 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 1); | |
475 | gmux_write8(gmux_data, GMUX_PORT_DISCRETE_POWER, 0); | |
476 | pr_debug("Discrete card powered down\n"); | |
477 | } | |
478 | ||
479 | gmux_data->power_state = state; | |
480 | ||
481 | if (gmux_data->gpe >= 0 && | |
482 | !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done, | |
483 | msecs_to_jiffies(200))) | |
484 | pr_warn("Timeout waiting for gmux switch to complete\n"); | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | static int gmux_set_power_state(enum vga_switcheroo_client_id id, | |
490 | enum vga_switcheroo_state state) | |
491 | { | |
492 | if (id == VGA_SWITCHEROO_IGD) | |
493 | return 0; | |
494 | ||
495 | return gmux_set_discrete_state(apple_gmux_data, state); | |
496 | } | |
497 | ||
498 | static int gmux_get_client_id(struct pci_dev *pdev) | |
499 | { | |
500 | /* | |
501 | * Early Macbook Pros with switchable graphics use nvidia | |
502 | * integrated graphics. Hardcode that the 9400M is integrated. | |
503 | */ | |
504 | if (pdev->vendor == PCI_VENDOR_ID_INTEL) | |
505 | return VGA_SWITCHEROO_IGD; | |
506 | else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA && | |
507 | pdev->device == 0x0863) | |
508 | return VGA_SWITCHEROO_IGD; | |
509 | else | |
510 | return VGA_SWITCHEROO_DIS; | |
511 | } | |
512 | ||
f798d965 | 513 | static const struct vga_switcheroo_handler gmux_handler_indexed = { |
76b487dd AH |
514 | .switchto = gmux_switchto, |
515 | .power_state = gmux_set_power_state, | |
516 | .get_client_id = gmux_get_client_id, | |
517 | }; | |
518 | ||
f798d965 LW |
519 | static const struct vga_switcheroo_handler gmux_handler_classic = { |
520 | .switchto = gmux_switchto, | |
521 | .switch_ddc = gmux_switch_ddc, | |
522 | .power_state = gmux_set_power_state, | |
523 | .get_client_id = gmux_get_client_id, | |
524 | }; | |
525 | ||
3d7b75fd LW |
526 | /** |
527 | * DOC: Interrupt | |
528 | * | |
529 | * gmux is also connected to a GPIO pin of the southbridge and thereby is able | |
530 | * to trigger an ACPI GPE. On the MBP5 2008/09 it's GPIO pin 22 of the Nvidia | |
531 | * MCP79, on all following generations it's GPIO pin 6 of the Intel PCH. | |
532 | * The GPE merely signals that an interrupt occurred, the actual type of event | |
533 | * is identified by reading a gmux register. | |
534 | */ | |
535 | ||
76b487dd AH |
536 | static inline void gmux_disable_interrupts(struct apple_gmux_data *gmux_data) |
537 | { | |
538 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, | |
539 | GMUX_INTERRUPT_DISABLE); | |
540 | } | |
541 | ||
542 | static inline void gmux_enable_interrupts(struct apple_gmux_data *gmux_data) | |
543 | { | |
544 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_ENABLE, | |
545 | GMUX_INTERRUPT_ENABLE); | |
546 | } | |
547 | ||
548 | static inline u8 gmux_interrupt_get_status(struct apple_gmux_data *gmux_data) | |
549 | { | |
550 | return gmux_read8(gmux_data, GMUX_PORT_INTERRUPT_STATUS); | |
551 | } | |
552 | ||
553 | static void gmux_clear_interrupts(struct apple_gmux_data *gmux_data) | |
554 | { | |
555 | u8 status; | |
556 | ||
557 | /* to clear interrupts write back current status */ | |
558 | status = gmux_interrupt_get_status(gmux_data); | |
559 | gmux_write8(gmux_data, GMUX_PORT_INTERRUPT_STATUS, status); | |
560 | } | |
561 | ||
562 | static void gmux_notify_handler(acpi_handle device, u32 value, void *context) | |
563 | { | |
564 | u8 status; | |
565 | struct pnp_dev *pnp = (struct pnp_dev *)context; | |
566 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); | |
567 | ||
568 | status = gmux_interrupt_get_status(gmux_data); | |
569 | gmux_disable_interrupts(gmux_data); | |
570 | pr_debug("Notify handler called: status %d\n", status); | |
571 | ||
572 | gmux_clear_interrupts(gmux_data); | |
573 | gmux_enable_interrupts(gmux_data); | |
574 | ||
575 | if (status & GMUX_INTERRUPT_STATUS_POWER) | |
576 | complete(&gmux_data->powerchange_done); | |
577 | } | |
578 | ||
8aa6c216 | 579 | static int gmux_suspend(struct device *dev) |
76b487dd | 580 | { |
8aa6c216 | 581 | struct pnp_dev *pnp = to_pnp_dev(dev); |
76b487dd | 582 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
8aa6c216 | 583 | |
76b487dd AH |
584 | gmux_disable_interrupts(gmux_data); |
585 | return 0; | |
586 | } | |
587 | ||
8aa6c216 | 588 | static int gmux_resume(struct device *dev) |
76b487dd | 589 | { |
8aa6c216 | 590 | struct pnp_dev *pnp = to_pnp_dev(dev); |
76b487dd | 591 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); |
8aa6c216 | 592 | |
76b487dd | 593 | gmux_enable_interrupts(gmux_data); |
3e46304e | 594 | gmux_write_switch_state(gmux_data); |
76b487dd AH |
595 | if (gmux_data->power_state == VGA_SWITCHEROO_OFF) |
596 | gmux_set_discrete_state(gmux_data, gmux_data->power_state); | |
597 | return 0; | |
598 | } | |
599 | ||
b121b051 LW |
600 | static int is_thunderbolt(struct device *dev, void *data) |
601 | { | |
602 | return to_pci_dev(dev)->is_thunderbolt; | |
603 | } | |
604 | ||
b859f159 | 605 | static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) |
917ee75a SF |
606 | { |
607 | struct apple_gmux_data *gmux_data; | |
608 | struct resource *res; | |
609 | struct backlight_properties props; | |
610 | struct backlight_device *bdev; | |
611 | u8 ver_major, ver_minor, ver_release; | |
612 | int ret = -ENXIO; | |
76b487dd AH |
613 | acpi_status status; |
614 | unsigned long long gpe; | |
615 | ||
616 | if (apple_gmux_data) | |
617 | return -EBUSY; | |
917ee75a SF |
618 | |
619 | gmux_data = kzalloc(sizeof(*gmux_data), GFP_KERNEL); | |
620 | if (!gmux_data) | |
621 | return -ENOMEM; | |
622 | pnp_set_drvdata(pnp, gmux_data); | |
623 | ||
624 | res = pnp_get_resource(pnp, IORESOURCE_IO, 0); | |
625 | if (!res) { | |
626 | pr_err("Failed to find gmux I/O resource\n"); | |
627 | goto err_free; | |
628 | } | |
629 | ||
630 | gmux_data->iostart = res->start; | |
631 | gmux_data->iolen = res->end - res->start; | |
632 | ||
633 | if (gmux_data->iolen < GMUX_MIN_IO_LEN) { | |
634 | pr_err("gmux I/O region too small (%lu < %u)\n", | |
635 | gmux_data->iolen, GMUX_MIN_IO_LEN); | |
636 | goto err_free; | |
637 | } | |
638 | ||
639 | if (!request_region(gmux_data->iostart, gmux_data->iolen, | |
640 | "Apple gmux")) { | |
641 | pr_err("gmux I/O already in use\n"); | |
642 | goto err_free; | |
643 | } | |
644 | ||
645 | /* | |
96ff7056 MG |
646 | * Invalid version information may indicate either that the gmux |
647 | * device isn't present or that it's a new one that uses indexed | |
648 | * io | |
917ee75a | 649 | */ |
96ff7056 | 650 | |
917ee75a SF |
651 | ver_major = gmux_read8(gmux_data, GMUX_PORT_VERSION_MAJOR); |
652 | ver_minor = gmux_read8(gmux_data, GMUX_PORT_VERSION_MINOR); | |
653 | ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE); | |
654 | if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) { | |
96ff7056 | 655 | if (gmux_is_indexed(gmux_data)) { |
07f377da | 656 | u32 version; |
96ff7056 MG |
657 | mutex_init(&gmux_data->index_lock); |
658 | gmux_data->indexed = true; | |
07f377da BF |
659 | version = gmux_read32(gmux_data, |
660 | GMUX_PORT_VERSION_MAJOR); | |
661 | ver_major = (version >> 24) & 0xff; | |
662 | ver_minor = (version >> 16) & 0xff; | |
663 | ver_release = (version >> 8) & 0xff; | |
96ff7056 | 664 | } else { |
517ad2c0 | 665 | pr_info("gmux device not present\n"); |
96ff7056 MG |
666 | ret = -ENODEV; |
667 | goto err_release; | |
668 | } | |
917ee75a | 669 | } |
07f377da BF |
670 | pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor, |
671 | ver_release, (gmux_data->indexed ? "indexed" : "classic")); | |
917ee75a | 672 | |
917ee75a SF |
673 | memset(&props, 0, sizeof(props)); |
674 | props.type = BACKLIGHT_PLATFORM; | |
675 | props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS); | |
676 | ||
677 | /* | |
678 | * Currently it's assumed that the maximum brightness is less than | |
679 | * 2^24 for compatibility with old gmux versions. Cap the max | |
680 | * brightness at this value, but print a warning if the hardware | |
681 | * reports something higher so that it can be fixed. | |
682 | */ | |
683 | if (WARN_ON(props.max_brightness > GMUX_MAX_BRIGHTNESS)) | |
684 | props.max_brightness = GMUX_MAX_BRIGHTNESS; | |
685 | ||
686 | bdev = backlight_device_register("gmux_backlight", &pnp->dev, | |
687 | gmux_data, &gmux_bl_ops, &props); | |
688 | if (IS_ERR(bdev)) { | |
689 | ret = PTR_ERR(bdev); | |
690 | goto err_release; | |
691 | } | |
692 | ||
693 | gmux_data->bdev = bdev; | |
694 | bdev->props.brightness = gmux_get_brightness(bdev); | |
695 | backlight_update_status(bdev); | |
696 | ||
697 | /* | |
698 | * The backlight situation on Macs is complicated. If the gmux is | |
699 | * present it's the best choice, because it always works for | |
700 | * backlight control and supports more levels than other options. | |
701 | * Disable the other backlight choices. | |
702 | */ | |
86ac056a | 703 | acpi_video_set_dmi_backlight_type(acpi_backlight_vendor); |
917ee75a SF |
704 | apple_bl_unregister(); |
705 | ||
76b487dd AH |
706 | gmux_data->power_state = VGA_SWITCHEROO_ON; |
707 | ||
3a83f992 | 708 | gmux_data->dhandle = ACPI_HANDLE(&pnp->dev); |
76b487dd AH |
709 | if (!gmux_data->dhandle) { |
710 | pr_err("Cannot find acpi handle for pnp device %s\n", | |
711 | dev_name(&pnp->dev)); | |
712 | ret = -ENODEV; | |
713 | goto err_notify; | |
714 | } | |
715 | ||
716 | status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe); | |
717 | if (ACPI_SUCCESS(status)) { | |
718 | gmux_data->gpe = (int)gpe; | |
719 | ||
720 | status = acpi_install_notify_handler(gmux_data->dhandle, | |
721 | ACPI_DEVICE_NOTIFY, | |
722 | &gmux_notify_handler, pnp); | |
723 | if (ACPI_FAILURE(status)) { | |
724 | pr_err("Install notify handler failed: %s\n", | |
725 | acpi_format_exception(status)); | |
726 | ret = -ENODEV; | |
727 | goto err_notify; | |
728 | } | |
729 | ||
730 | status = acpi_enable_gpe(NULL, gmux_data->gpe); | |
731 | if (ACPI_FAILURE(status)) { | |
732 | pr_err("Cannot enable gpe: %s\n", | |
733 | acpi_format_exception(status)); | |
734 | goto err_enable_gpe; | |
735 | } | |
736 | } else { | |
737 | pr_warn("No GPE found for gmux\n"); | |
738 | gmux_data->gpe = -1; | |
739 | } | |
740 | ||
b121b051 LW |
741 | /* |
742 | * If Thunderbolt is present, the external DP port is not fully | |
743 | * switchable. Force its AUX channel to the discrete GPU. | |
744 | */ | |
745 | gmux_data->external_switchable = | |
746 | !bus_for_each_dev(&pci_bus_type, NULL, NULL, is_thunderbolt); | |
747 | if (!gmux_data->external_switchable) | |
748 | gmux_write8(gmux_data, GMUX_PORT_SWITCH_EXTERNAL, 3); | |
749 | ||
c1e1655b MG |
750 | apple_gmux_data = gmux_data; |
751 | init_completion(&gmux_data->powerchange_done); | |
752 | gmux_enable_interrupts(gmux_data); | |
3e46304e | 753 | gmux_read_switch_state(gmux_data); |
c1e1655b | 754 | |
f798d965 LW |
755 | /* |
756 | * Retina MacBook Pros cannot switch the panel's AUX separately | |
757 | * and need eDP pre-calibration. They are distinguishable from | |
758 | * pre-retinas by having an "indexed" gmux. | |
759 | * | |
760 | * Pre-retina MacBook Pros can switch the panel's DDC separately. | |
761 | */ | |
762 | if (gmux_data->indexed) | |
763 | ret = vga_switcheroo_register_handler(&gmux_handler_indexed, | |
764 | VGA_SWITCHEROO_NEEDS_EDP_CONFIG); | |
765 | else | |
766 | ret = vga_switcheroo_register_handler(&gmux_handler_classic, | |
767 | VGA_SWITCHEROO_CAN_SWITCH_DDC); | |
768 | if (ret) { | |
769 | pr_err("Failed to register vga_switcheroo handler\n"); | |
76b487dd AH |
770 | goto err_register_handler; |
771 | } | |
772 | ||
917ee75a SF |
773 | return 0; |
774 | ||
76b487dd | 775 | err_register_handler: |
c1e1655b MG |
776 | gmux_disable_interrupts(gmux_data); |
777 | apple_gmux_data = NULL; | |
76b487dd AH |
778 | if (gmux_data->gpe >= 0) |
779 | acpi_disable_gpe(NULL, gmux_data->gpe); | |
780 | err_enable_gpe: | |
781 | if (gmux_data->gpe >= 0) | |
782 | acpi_remove_notify_handler(gmux_data->dhandle, | |
783 | ACPI_DEVICE_NOTIFY, | |
784 | &gmux_notify_handler); | |
785 | err_notify: | |
786 | backlight_device_unregister(bdev); | |
917ee75a SF |
787 | err_release: |
788 | release_region(gmux_data->iostart, gmux_data->iolen); | |
789 | err_free: | |
790 | kfree(gmux_data); | |
791 | return ret; | |
792 | } | |
793 | ||
b859f159 | 794 | static void gmux_remove(struct pnp_dev *pnp) |
917ee75a SF |
795 | { |
796 | struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp); | |
797 | ||
76b487dd AH |
798 | vga_switcheroo_unregister_handler(); |
799 | gmux_disable_interrupts(gmux_data); | |
800 | if (gmux_data->gpe >= 0) { | |
801 | acpi_disable_gpe(NULL, gmux_data->gpe); | |
802 | acpi_remove_notify_handler(gmux_data->dhandle, | |
803 | ACPI_DEVICE_NOTIFY, | |
804 | &gmux_notify_handler); | |
805 | } | |
806 | ||
917ee75a | 807 | backlight_device_unregister(gmux_data->bdev); |
76b487dd | 808 | |
917ee75a | 809 | release_region(gmux_data->iostart, gmux_data->iolen); |
76b487dd | 810 | apple_gmux_data = NULL; |
917ee75a SF |
811 | kfree(gmux_data); |
812 | ||
813 | acpi_video_register(); | |
814 | apple_bl_register(); | |
815 | } | |
816 | ||
817 | static const struct pnp_device_id gmux_device_ids[] = { | |
2413306c | 818 | {GMUX_ACPI_HID, 0}, |
917ee75a SF |
819 | {"", 0} |
820 | }; | |
821 | ||
8aa6c216 SK |
822 | static const struct dev_pm_ops gmux_dev_pm_ops = { |
823 | .suspend = gmux_suspend, | |
824 | .resume = gmux_resume, | |
825 | }; | |
826 | ||
917ee75a SF |
827 | static struct pnp_driver gmux_pnp_driver = { |
828 | .name = "apple-gmux", | |
829 | .probe = gmux_probe, | |
b859f159 | 830 | .remove = gmux_remove, |
917ee75a | 831 | .id_table = gmux_device_ids, |
8aa6c216 SK |
832 | .driver = { |
833 | .pm = &gmux_dev_pm_ops, | |
834 | }, | |
917ee75a SF |
835 | }; |
836 | ||
99f74f12 | 837 | module_pnp_driver(gmux_pnp_driver); |
917ee75a SF |
838 | MODULE_AUTHOR("Seth Forshee <seth.forshee@canonical.com>"); |
839 | MODULE_DESCRIPTION("Apple Gmux Driver"); | |
840 | MODULE_LICENSE("GPL"); | |
841 | MODULE_DEVICE_TABLE(pnp, gmux_device_ids); |