1 // SPDX-License-Identifier: GPL-2.0-only
6  *  Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de>
19 #include <linux/apple-gmux.h>
30  * A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on retinas.
33  * dual GPUs but no built-in display.)
35  * gmux is connected to the LPC bus of the southbridge. Its I/O ports are
37  * to access a pre-retina gmux are infixed ``_pio_``, those for a retina gmux
103 	return inb(gmux_data->iostart + port);  in gmux_pio_read8()
109 	outb(val, gmux_data->iostart + port);  in gmux_pio_write8()
114 	return inl(gmux_data->iostart + port);  in gmux_pio_read32()
125 		outb(tmpval, gmux_data->iostart + port + i);  in gmux_pio_write32()
132 	u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_ready()
135 		inb(gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_wait_ready()
136 		gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_ready()
138 		i--;  in gmux_index_wait_ready()
147 	u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_complete()
150 		gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_complete()
152 		i--;  in gmux_index_wait_complete()
156 		inb(gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_wait_complete()
165 	mutex_lock(&gmux_data->index_lock);  in gmux_index_read8()
167 	outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_read8()
169 	val = inb(gmux_data->iostart + GMUX_PORT_VALUE);  in gmux_index_read8()
170 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_read8()
178 	mutex_lock(&gmux_data->index_lock);  in gmux_index_write8()
179 	outb(val, gmux_data->iostart + GMUX_PORT_VALUE);  in gmux_index_write8()
181 	outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_write8()
183 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_write8()
190 	mutex_lock(&gmux_data->index_lock);  in gmux_index_read32()
192 	outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_read32()
194 	val = inl(gmux_data->iostart + GMUX_PORT_VALUE);  in gmux_index_read32()
195 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_read32()
206 	mutex_lock(&gmux_data->index_lock);  in gmux_index_write32()
210 		outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i);  in gmux_index_write32()
214 	outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_write32()
216 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_write32()
221 	if (gmux_data->indexed)  in gmux_read8()
229 	if (gmux_data->indexed)  in gmux_write8()
237 	if (gmux_data->indexed)  in gmux_read32()
246 	if (gmux_data->indexed)  in gmux_write32()
256 	outb(0xaa, gmux_data->iostart + 0xcc);  in gmux_is_indexed()
257 	outb(0x55, gmux_data->iostart + 0xcd);  in gmux_is_indexed()
258 	outb(0x00, gmux_data->iostart + 0xce);  in gmux_is_indexed()
260 	val = inb(gmux_data->iostart + 0xcc) |  in gmux_is_indexed()
261 		(inb(gmux_data->iostart + 0xcd) << 8);  in gmux_is_indexed()
309  * On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes
310  * either of them to the panel. One of the tricks gmux has up its sleeve is
311  * to lengthen the blanking interval of its output during a switch to
312  * synchronize it with the GPU switched to. This allows for a flicker-free
321  * Pre-retinas are able to switch the panel's DDC pins separately.
328  * in its DPCD, allowing the inactive GPU to skip the AUX handshake and
329  * set up the output with link parameters pre-calibrated by the active GPU.
340  * are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas
343  * external displays appear to it as phantoms which fail to link-train.
367  * variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte,
372  * .. _US 8,687,007 B2: https://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf
378 …* .. _NXP CBTL03062:   http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.…
385 		gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD;  in gmux_read_switch_state()
387 		gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS;  in gmux_read_switch_state()
390 		gmux_data->switch_state_display = VGA_SWITCHEROO_IGD;  in gmux_read_switch_state()
392 		gmux_data->switch_state_display = VGA_SWITCHEROO_DIS;  in gmux_read_switch_state()
395 		gmux_data->switch_state_external = VGA_SWITCHEROO_IGD;  in gmux_read_switch_state()
397 		gmux_data->switch_state_external = VGA_SWITCHEROO_DIS;  in gmux_read_switch_state()
402 	if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD)  in gmux_write_switch_state()
407 	if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD)  in gmux_write_switch_state()
412 	if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD)  in gmux_write_switch_state()
420 	apple_gmux_data->switch_state_ddc = id;  in gmux_switchto()
421 	apple_gmux_data->switch_state_display = id;  in gmux_switchto()
422 	if (apple_gmux_data->external_switchable)  in gmux_switchto()
423 		apple_gmux_data->switch_state_external = id;  in gmux_switchto()
433 		apple_gmux_data->switch_state_ddc;  in gmux_switch_ddc()
439 	apple_gmux_data->switch_state_ddc = id;  in gmux_switch_ddc()
460 	reinit_completion(&gmux_data->powerchange_done);  in gmux_set_discrete_state()
472 	gmux_data->power_state = state;  in gmux_set_discrete_state()
474 	if (gmux_data->gpe >= 0 &&  in gmux_set_discrete_state()
475 	    !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done,  in gmux_set_discrete_state()
497 	if (pdev->vendor == PCI_VENDOR_ID_INTEL)  in gmux_get_client_id()
499 	else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&  in gmux_get_client_id()
500 		 pdev->device == 0x0863)  in gmux_get_client_id()
569 		complete(&gmux_data->powerchange_done);  in gmux_notify_handler()
588 	if (gmux_data->power_state == VGA_SWITCHEROO_OFF)  in gmux_resume()
589 		gmux_set_discrete_state(gmux_data, gmux_data->power_state);  in gmux_resume()
595 	return to_pci_dev(dev)->is_thunderbolt;  in is_thunderbolt()
605 	int ret = -ENXIO;  in gmux_probe()
610 		return -EBUSY;  in gmux_probe()
614 		return -ENOMEM;  in gmux_probe()
623 	gmux_data->iostart = res->start;  in gmux_probe()
624 	gmux_data->iolen = resource_size(res);  in gmux_probe()
626 	if (gmux_data->iolen < GMUX_MIN_IO_LEN) {  in gmux_probe()
628 		       gmux_data->iolen, GMUX_MIN_IO_LEN);  in gmux_probe()
632 	if (!request_region(gmux_data->iostart, gmux_data->iolen,  in gmux_probe()
650 			mutex_init(&gmux_data->index_lock);  in gmux_probe()
651 			gmux_data->indexed = true;  in gmux_probe()
659 			ret = -ENODEV;  in gmux_probe()
664 		ver_release, (gmux_data->indexed ? "indexed" : "classic"));  in gmux_probe()
679 	bdev = backlight_device_register("gmux_backlight", &pnp->dev,  in gmux_probe()
686 	gmux_data->bdev = bdev;  in gmux_probe()
687 	bdev->props.brightness = gmux_get_brightness(bdev);  in gmux_probe()
698 	gmux_data->power_state = VGA_SWITCHEROO_ON;  in gmux_probe()
700 	gmux_data->dhandle = ACPI_HANDLE(&pnp->dev);  in gmux_probe()
701 	if (!gmux_data->dhandle) {  in gmux_probe()
703 		       dev_name(&pnp->dev));  in gmux_probe()
704 		ret = -ENODEV;  in gmux_probe()
708 	status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe);  in gmux_probe()
710 		gmux_data->gpe = (int)gpe;  in gmux_probe()
712 		status = acpi_install_notify_handler(gmux_data->dhandle,  in gmux_probe()
718 			ret = -ENODEV;  in gmux_probe()
722 		status = acpi_enable_gpe(NULL, gmux_data->gpe);  in gmux_probe()
730 		gmux_data->gpe = -1;  in gmux_probe()
735 	 * switchable. Force its AUX channel to the discrete GPU.  in gmux_probe()
737 	gmux_data->external_switchable =  in gmux_probe()
739 	if (!gmux_data->external_switchable)  in gmux_probe()
743 	init_completion(&gmux_data->powerchange_done);  in gmux_probe()
749 	 * and need eDP pre-calibration. They are distinguishable from  in gmux_probe()
750 	 * pre-retinas by having an "indexed" gmux.  in gmux_probe()
752 	 * Pre-retina MacBook Pros can switch the panel's DDC separately.  in gmux_probe()
754 	if (gmux_data->indexed)  in gmux_probe()
770 	if (gmux_data->gpe >= 0)  in gmux_probe()
771 		acpi_disable_gpe(NULL, gmux_data->gpe);  in gmux_probe()
773 	if (gmux_data->gpe >= 0)  in gmux_probe()
774 		acpi_remove_notify_handler(gmux_data->dhandle,  in gmux_probe()
780 	release_region(gmux_data->iostart, gmux_data->iolen);  in gmux_probe()
792 	if (gmux_data->gpe >= 0) {  in gmux_remove()
793 		acpi_disable_gpe(NULL, gmux_data->gpe);  in gmux_remove()
794 		acpi_remove_notify_handler(gmux_data->dhandle,  in gmux_remove()
799 	backlight_device_unregister(gmux_data->bdev);  in gmux_remove()
801 	release_region(gmux_data->iostart, gmux_data->iolen);  in gmux_remove()
819 	.name		= "apple-gmux",