1 // SPDX-License-Identifier: GPL-2.0-only
6  *  Copyright (C) 2010-2012 Andreas Heider <andreas@meetr.de>
19 #include <linux/apple-gmux.h>
31  * A `Lattice XP2`_ on pre-retinas, a `Renesas R4F2113`_ on retinas.
34  * dual GPUs but no built-in display.)
36  * gmux is connected to the LPC bus of the southbridge. Its I/O ports are
38  * to access a pre-retina gmux are infixed ``_pio_``, those for a retina gmux
104 	return inb(gmux_data->iostart + port);  in gmux_pio_read8()
110 	outb(val, gmux_data->iostart + port);  in gmux_pio_write8()
115 	return inl(gmux_data->iostart + port);  in gmux_pio_read32()
126 		outb(tmpval, gmux_data->iostart + port + i);  in gmux_pio_write32()
133 	u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_ready()
136 		inb(gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_wait_ready()
137 		gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_ready()
139 		i--;  in gmux_index_wait_ready()
148 	u8 gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_complete()
151 		gwr = inb(gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_wait_complete()
153 		i--;  in gmux_index_wait_complete()
157 		inb(gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_wait_complete()
166 	mutex_lock(&gmux_data->index_lock);  in gmux_index_read8()
168 	outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_read8()
170 	val = inb(gmux_data->iostart + GMUX_PORT_VALUE);  in gmux_index_read8()
171 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_read8()
179 	mutex_lock(&gmux_data->index_lock);  in gmux_index_write8()
180 	outb(val, gmux_data->iostart + GMUX_PORT_VALUE);  in gmux_index_write8()
182 	outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_write8()
184 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_write8()
191 	mutex_lock(&gmux_data->index_lock);  in gmux_index_read32()
193 	outb((port & 0xff), gmux_data->iostart + GMUX_PORT_READ);  in gmux_index_read32()
195 	val = inl(gmux_data->iostart + GMUX_PORT_VALUE);  in gmux_index_read32()
196 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_read32()
207 	mutex_lock(&gmux_data->index_lock);  in gmux_index_write32()
211 		outb(tmpval, gmux_data->iostart + GMUX_PORT_VALUE + i);  in gmux_index_write32()
215 	outb(port & 0xff, gmux_data->iostart + GMUX_PORT_WRITE);  in gmux_index_write32()
217 	mutex_unlock(&gmux_data->index_lock);  in gmux_index_write32()
222 	if (gmux_data->indexed)  in gmux_read8()
230 	if (gmux_data->indexed)  in gmux_write8()
238 	if (gmux_data->indexed)  in gmux_read32()
247 	if (gmux_data->indexed)  in gmux_write32()
257 	outb(0xaa, gmux_data->iostart + 0xcc);  in gmux_is_indexed()
258 	outb(0x55, gmux_data->iostart + 0xcd);  in gmux_is_indexed()
259 	outb(0x00, gmux_data->iostart + 0xce);  in gmux_is_indexed()
261 	val = inb(gmux_data->iostart + 0xcc) |  in gmux_is_indexed()
262 		(inb(gmux_data->iostart + 0xcd) << 8);  in gmux_is_indexed()
294 	u32 brightness = bd->props.brightness;  in gmux_update_status()
296 	if (bd->props.state & BL_CORE_SUSPENDED)  in gmux_update_status()
313  * On pre-retinas, the LVDS outputs of both GPUs feed into gmux which muxes
314  * either of them to the panel. One of the tricks gmux has up its sleeve is
315  * to lengthen the blanking interval of its output during a switch to
316  * synchronize it with the GPU switched to. This allows for a flicker-free
325  * Pre-retinas are able to switch the panel's DDC pins separately.
332  * in its DPCD, allowing the inactive GPU to skip the AUX handshake and
333  * set up the output with link parameters pre-calibrated by the active GPU.
344  * are still switchable by way of an `NXP CBTL03062`_ (on pre-retinas
347  * external displays appear to it as phantoms which fail to link-train.
371  * variable ``gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9`` (5th byte,
376  * .. _US 8,687,007 B2: https://pimg-fpiw.uspto.gov/fdd/07/870/086/0.pdf
382 …* .. _NXP CBTL03062:   http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW16/DSASW00308511.…
389 		gmux_data->switch_state_ddc = VGA_SWITCHEROO_IGD;  in gmux_read_switch_state()
391 		gmux_data->switch_state_ddc = VGA_SWITCHEROO_DIS;  in gmux_read_switch_state()
394 		gmux_data->switch_state_display = VGA_SWITCHEROO_IGD;  in gmux_read_switch_state()
396 		gmux_data->switch_state_display = VGA_SWITCHEROO_DIS;  in gmux_read_switch_state()
399 		gmux_data->switch_state_external = VGA_SWITCHEROO_IGD;  in gmux_read_switch_state()
401 		gmux_data->switch_state_external = VGA_SWITCHEROO_DIS;  in gmux_read_switch_state()
406 	if (gmux_data->switch_state_ddc == VGA_SWITCHEROO_IGD)  in gmux_write_switch_state()
411 	if (gmux_data->switch_state_display == VGA_SWITCHEROO_IGD)  in gmux_write_switch_state()
416 	if (gmux_data->switch_state_external == VGA_SWITCHEROO_IGD)  in gmux_write_switch_state()
424 	apple_gmux_data->switch_state_ddc = id;  in gmux_switchto()
425 	apple_gmux_data->switch_state_display = id;  in gmux_switchto()
426 	if (apple_gmux_data->external_switchable)  in gmux_switchto()
427 		apple_gmux_data->switch_state_external = id;  in gmux_switchto()
437 		apple_gmux_data->switch_state_ddc;  in gmux_switch_ddc()
443 	apple_gmux_data->switch_state_ddc = id;  in gmux_switch_ddc()
464 	reinit_completion(&gmux_data->powerchange_done);  in gmux_set_discrete_state()
476 	gmux_data->power_state = state;  in gmux_set_discrete_state()
478 	if (gmux_data->gpe >= 0 &&  in gmux_set_discrete_state()
479 	    !wait_for_completion_interruptible_timeout(&gmux_data->powerchange_done,  in gmux_set_discrete_state()
501 	if (pdev->vendor == PCI_VENDOR_ID_INTEL)  in gmux_get_client_id()
503 	else if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&  in gmux_get_client_id()
504 		 pdev->device == 0x0863)  in gmux_get_client_id()
573 		complete(&gmux_data->powerchange_done);  in gmux_notify_handler()
592 	if (gmux_data->power_state == VGA_SWITCHEROO_OFF)  in gmux_resume()
593 		gmux_set_discrete_state(gmux_data, gmux_data->power_state);  in gmux_resume()
599 	return to_pci_dev(dev)->is_thunderbolt;  in is_thunderbolt()
609 	int ret = -ENXIO;  in gmux_probe()
614 		return -EBUSY;  in gmux_probe()
618 		return -ENOMEM;  in gmux_probe()
627 	gmux_data->iostart = res->start;  in gmux_probe()
628 	gmux_data->iolen = res->end - res->start;  in gmux_probe()
630 	if (gmux_data->iolen < GMUX_MIN_IO_LEN) {  in gmux_probe()
632 		       gmux_data->iolen, GMUX_MIN_IO_LEN);  in gmux_probe()
636 	if (!request_region(gmux_data->iostart, gmux_data->iolen,  in gmux_probe()
654 			mutex_init(&gmux_data->index_lock);  in gmux_probe()
655 			gmux_data->indexed = true;  in gmux_probe()
663 			ret = -ENODEV;  in gmux_probe()
668 		ver_release, (gmux_data->indexed ? "indexed" : "classic"));  in gmux_probe()
683 	bdev = backlight_device_register("gmux_backlight", &pnp->dev,  in gmux_probe()
690 	gmux_data->bdev = bdev;  in gmux_probe()
691 	bdev->props.brightness = gmux_get_brightness(bdev);  in gmux_probe()
703 	gmux_data->power_state = VGA_SWITCHEROO_ON;  in gmux_probe()
705 	gmux_data->dhandle = ACPI_HANDLE(&pnp->dev);  in gmux_probe()
706 	if (!gmux_data->dhandle) {  in gmux_probe()
708 		       dev_name(&pnp->dev));  in gmux_probe()
709 		ret = -ENODEV;  in gmux_probe()
713 	status = acpi_evaluate_integer(gmux_data->dhandle, "GMGP", NULL, &gpe);  in gmux_probe()
715 		gmux_data->gpe = (int)gpe;  in gmux_probe()
717 		status = acpi_install_notify_handler(gmux_data->dhandle,  in gmux_probe()
723 			ret = -ENODEV;  in gmux_probe()
727 		status = acpi_enable_gpe(NULL, gmux_data->gpe);  in gmux_probe()
735 		gmux_data->gpe = -1;  in gmux_probe()
740 	 * switchable. Force its AUX channel to the discrete GPU.  in gmux_probe()
742 	gmux_data->external_switchable =  in gmux_probe()
744 	if (!gmux_data->external_switchable)  in gmux_probe()
748 	init_completion(&gmux_data->powerchange_done);  in gmux_probe()
754 	 * and need eDP pre-calibration. They are distinguishable from  in gmux_probe()
755 	 * pre-retinas by having an "indexed" gmux.  in gmux_probe()
757 	 * Pre-retina MacBook Pros can switch the panel's DDC separately.  in gmux_probe()
759 	if (gmux_data->indexed)  in gmux_probe()
775 	if (gmux_data->gpe >= 0)  in gmux_probe()
776 		acpi_disable_gpe(NULL, gmux_data->gpe);  in gmux_probe()
778 	if (gmux_data->gpe >= 0)  in gmux_probe()
779 		acpi_remove_notify_handler(gmux_data->dhandle,  in gmux_probe()
785 	release_region(gmux_data->iostart, gmux_data->iolen);  in gmux_probe()
797 	if (gmux_data->gpe >= 0) {  in gmux_remove()
798 		acpi_disable_gpe(NULL, gmux_data->gpe);  in gmux_remove()
799 		acpi_remove_notify_handler(gmux_data->dhandle,  in gmux_remove()
804 	backlight_device_unregister(gmux_data->bdev);  in gmux_remove()
806 	release_region(gmux_data->iostart, gmux_data->iolen);  in gmux_remove()
825 	.name		= "apple-gmux",