From patchwork Wed Sep 2 17:38:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Dadap X-Patchwork-Id: 11751453 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 94484138A for ; Wed, 2 Sep 2020 17:37:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B5BA207EA for ; Wed, 2 Sep 2020 17:37:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="oqWRzQQR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726493AbgIBRhI (ORCPT ); Wed, 2 Sep 2020 13:37:08 -0400 Received: from hqnvemgate25.nvidia.com ([216.228.121.64]:7826 "EHLO hqnvemgate25.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726140AbgIBRhD (ORCPT ); Wed, 2 Sep 2020 13:37:03 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 02 Sep 2020 10:36:16 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Wed, 02 Sep 2020 10:37:03 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Wed, 02 Sep 2020 10:37:03 -0700 Received: from lenny.nvidia.com (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 2 Sep 2020 17:37:02 +0000 From: Daniel Dadap To: CC: , , , , , , Daniel Dadap Subject: [PATCH v4] platform/x86: Add new vga-switcheroo gmux driver for ACPI-driven muxes Date: Wed, 2 Sep 2020 12:38:51 -0500 Message-ID: <20200902173851.224368-1-ddadap@nvidia.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: References: MIME-Version: 1.0 X-NVConfidentiality: public X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL107.nvidia.com (172.20.187.13) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1599068177; bh=MU5NTNzSDxHUHj68r7uccHcOMuN3AN5o2gbio14ecB4=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: X-Originating-IP:X-ClientProxiedBy:Content-Type: Content-Transfer-Encoding; b=oqWRzQQRuoO/CDp8a28TteBYRLvjtvX2iDE4qJKOqw1oW7IjQMnYmibndGGH0F017 3pzyAHPF2tuGG2hx8k5yi536ODiUvl7b5/XsmyQi32ePGlrHVrk+cuoKXw2DKDF2/8 gOR18QCsM6kj1ptE9CJiJJ4hYsWDSUlX878H6Y8tKOlkCbdSjw4B3ufIUPFW9iF3m7 ec3ByBIL3R8Asqw5tFUY/W4iA0qn/6F2bbR3zIIQMDPkTNClxU+P0jis2j18bouFMw VrTUIb+1qRZIlK+1apuGLjqQTpFs74Qs40yBABdiTUFkzWjKR3gcspMv+WCfI2tpiu K19V2Q6/136TA== Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org Some upcoming notebook designs utilize display muxes driven by a pair of ACPI methods, MXDM to query and configure the operational mode of the mux (integrated only, discrete only, hybrid non-muxed, hybrid with dynamic mux switching), and MXDS to query and set the mux state when running in dynamic switch mode. Add a vga-switcheroo driver to support switching the mux on systems with the ACPI MXDM/MXDS interface. The mux mode cannot be changed dynamically (calling MXDM to change the mode won't have effect until the next boot, and calling MXDM to read the mux mode returns the active mode, not the mode that will be enabled on next boot), and MXDS only works when the mux mode is set to dynamic switch, so this driver will fail to load when MXDM reports any non-dynamic mode. This driver currently only supports systems with Intel integrated graphics and NVIDIA discrete graphics. It will need to be updated if designs are developed using the same interfaces which utilize GPUs from other vendors. v2,v3: misc. fixes suggested by Barnabás Pőcze v4: misc. changes suggested by Lukas Wunner Signed-off-by: Daniel Dadap --- MAINTAINERS | 6 + drivers/platform/x86/Kconfig | 9 ++ drivers/platform/x86/Makefile | 2 + drivers/platform/x86/mxds-gmux.c | 265 +++++++++++++++++++++++++++++++ 4 files changed, 282 insertions(+) create mode 100644 drivers/platform/x86/mxds-gmux.c diff --git a/MAINTAINERS b/MAINTAINERS index eeff55560759..636c9259b345 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11510,6 +11510,12 @@ L: linux-usb@vger.kernel.org S: Maintained F: drivers/usb/musb/ +MXDS GMUX DRIVER +M: Daniel Dadap +L: platform-driver-x86@vger.kernel.org +S: Supported +F: drivers/platform/x86/mxds-gmux.c + MXL301RF MEDIA DRIVER M: Akihiro Tsukada L: linux-media@vger.kernel.org diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 0ad7ad8cf8e1..5d00ad1ffc0e 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1368,6 +1368,15 @@ config INTEL_TELEMETRY directly via debugfs files. Various tools may use this interface for SoC state monitoring. +config MXDS_GMUX + tristate "ACPI MXDS Gmux Driver" + depends on ACPI_WMI + depends on ACPI + depends on VGA_SWITCHEROO + help + This driver provides support for ACPI-driven gmux devices which are + present on some notebook designs with hybrid graphics. + endif # X86_PLATFORM_DEVICES config PMC_ATOM diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index 53408d965874..b79000733fae 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -146,3 +146,5 @@ obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \ intel_telemetry_pltdrv.o \ intel_telemetry_debugfs.o obj-$(CONFIG_PMC_ATOM) += pmc_atom.o + +obj-$(CONFIG_MXDS_GMUX) += mxds-gmux.o diff --git a/drivers/platform/x86/mxds-gmux.c b/drivers/platform/x86/mxds-gmux.c new file mode 100644 index 000000000000..dd7f6edaf0f3 --- /dev/null +++ b/drivers/platform/x86/mxds-gmux.c @@ -0,0 +1,265 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * mxds-gmux: vga_switcheroo mux handler for ACPI MXDS muxes + * + * Copyright (C) 2020 NVIDIA Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see . + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("vga_switcheroo mux handler for ACPI MXDS muxes"); +MODULE_AUTHOR("Daniel Dadap "); + +/* + * The mux doesn't have its own ACPI HID/CID, or WMI wrapper, so key off of + * the WMI wrapper for the related WMAA method for backlight control. + */ +MODULE_ALIAS("wmi:603E9613-EF25-4338-A3D0-C46177516DB7"); + +static struct pci_dev *ig_dev, *dg_dev; +static acpi_handle internal_mux_handle; +static acpi_handle external_mux_handle; + +enum acpi_method { + MXDM = 0, + MXDS, + NUM_ACPI_METHODS +}; + +static char *acpi_methods[NUM_ACPI_METHODS] = { + [MXDM] = "MXDM", + [MXDS] = "MXDS", +}; + +enum mux_mode_command { + MUX_MODE_GET = 0, +}; + +enum mux_mode { + MUX_MODE_DGPU_ONLY = 1, + MUX_MODE_IGPU_ONLY = 2, + MUX_MODE_MSHYBRID = 3, /* Dual GPU, mux switched to iGPU */ + MUX_MODE_DYNAMIC = 4, /* Dual GPU, dynamic mux switching */ +}; + +/* + * Call MXDS with argument value 0 to read the current state. + * When reading, a return value of 1 means iGPU and 2 means dGPU. + * Call MXDS with bit 0 set to change the current state. + * When changing state, clear bit 4 for iGPU and set bit 4 for dGPU. + */ + +enum mux_state { + MUX_STATE_IGPU = 1, + MUX_STATE_DGPU = 2, +}; + +enum mux_state_command { + MUX_STATE_GET = 0, + MUX_STATE_SET_IGPU = BIT(0), + MUX_STATE_SET_DGPU = BIT(4) | BIT(0), +}; + +static acpi_integer acpi_helper(acpi_handle handle, enum acpi_method method, + acpi_integer action) +{ + union acpi_object arg = { + .integer = { .type = ACPI_TYPE_INTEGER, .value = action } + }; + struct acpi_object_list in = {.count = 1, .pointer = &arg}; + acpi_integer ret; + acpi_status status; + + status = acpi_evaluate_integer(handle, acpi_methods[method], &in, &ret); + + if (ACPI_FAILURE(status)) { + pr_err("ACPI %s failed: %s\n", acpi_methods[method], + acpi_format_exception(status)); + return 0; + } + + return ret; +} + +static acpi_integer get_mux_mode(acpi_handle handle) +{ + return acpi_helper(handle, MXDM, MUX_MODE_GET); +} + +static acpi_integer get_mux_state(acpi_handle handle) +{ + return acpi_helper(handle, MXDS, MUX_STATE_GET); +} + +static void set_mux_state(acpi_handle handle, enum mux_state state) +{ + enum mux_state_command command; + + switch (state) { + case MUX_STATE_IGPU: + command = MUX_STATE_SET_IGPU; + break; + case MUX_STATE_DGPU: + command = MUX_STATE_SET_DGPU; + break; + default: + return; + } + + acpi_helper(handle, MXDS, command); +} + +static int mxds_gmux_switchto(enum vga_switcheroo_client_id id) +{ + enum mux_state state; + + switch (id) { + case VGA_SWITCHEROO_IGD: + state = MUX_STATE_IGPU; + break; + case VGA_SWITCHEROO_DIS: + state = MUX_STATE_DGPU; + break; + default: + return -EINVAL; + } + + if (internal_mux_handle) { + set_mux_state(internal_mux_handle, state); + if (get_mux_state(internal_mux_handle) != state) + return -EAGAIN; + } + + if (external_mux_handle) { + set_mux_state(external_mux_handle, state); + if (get_mux_state(external_mux_handle) != state) + return -EAGAIN; + } + + /* DP AUX can take up to 100ms to settle after mux switch */ + mdelay(100); + + return 0; +} + +static enum vga_switcheroo_client_id mxds_gmux_get_client_id( + struct pci_dev *dev) +{ + if (dev == ig_dev) + return VGA_SWITCHEROO_IGD; + if (dev == dg_dev) + return VGA_SWITCHEROO_DIS; + + return VGA_SWITCHEROO_UNKNOWN_ID; +} + +static const struct vga_switcheroo_handler handler = { + .switchto = mxds_gmux_switchto, + .get_client_id = mxds_gmux_get_client_id, +}; + +static acpi_status find_acpi_methods( + acpi_handle object, u32 nesting_level, void *context, + void **return_value) +{ + acpi_handle search; + + /* If either MXDM or MXDS is missing, we can't use this object */ + if (acpi_get_handle(object, "MXDM", &search)) + return AE_OK; + if (acpi_get_handle(object, "MXDS", &search)) + return AE_OK; + + /* MXDS only works when MXDM indicates dynamic mode */ + if (get_mux_mode(object) != MUX_MODE_DYNAMIC) + return AE_OK; + + /* Internal display has _BCL; external does not */ + if (acpi_get_handle(object, "_BCL", &search)) + external_mux_handle = object; + else + internal_mux_handle = object; + + return AE_OK; +} + +static int __init mxds_gmux_init(void) +{ + int ret = 0; + struct pci_dev *dev = NULL; + + /* Currently only supports Intel integrated and NVIDIA discrete GPUs */ + while ((dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev))) { + /* Ignore eGPU */ + if (pci_is_thunderbolt_attached(dev)) + continue; + + switch (dev->vendor) { + case PCI_VENDOR_ID_INTEL: + pci_dev_put(ig_dev); + ig_dev = pci_dev_get(dev); + break; + case PCI_VENDOR_ID_NVIDIA: + pci_dev_put(dg_dev); + dg_dev = pci_dev_get(dev); + break; + default: + break; + } + } + + /* Require both integrated and discrete GPUs */ + if (!ig_dev || !dg_dev) { + ret = -ENODEV; + goto done; + } + + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, + find_acpi_methods, NULL, NULL, NULL); + + /* Require at least one mux */ + if (!internal_mux_handle && !external_mux_handle) { + ret = -ENODEV; + goto done; + } + + ret = vga_switcheroo_register_handler(&handler, 0); + +done: + + if (ret) { + pci_dev_put(ig_dev); + pci_dev_put(dg_dev); + } + + return ret; +} +module_init(mxds_gmux_init); + +static void __exit mxds_gmux_exit(void) +{ + vga_switcheroo_unregister_handler(); + pci_dev_put(ig_dev); + pci_dev_put(dg_dev); +} +module_exit(mxds_gmux_exit);