drm/nouveau/mxm: implement _DSM shadow method (3952315b) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/gpu/drm/nouveau/nouveau_mxm.c

+60 −1

Original line number	Diff line number	Diff line
		@@ -476,12 +476,69 @@ mxm_shadow_rom(struct drm_device *dev, u8 version)
		return false;
		}

		#if defined(CONFIG_ACPI)
		static bool
		mxm_shadow_dsm(struct drm_device *dev, u8 version)
		{
		struct drm_nouveau_private *dev_priv = dev->dev_private;
		static char muid[] = {
		0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C,
		0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65
		};
		u32 mxms_args[] = { 0x00000000 };
		union acpi_object args[4] = {
		/* _DSM MUID */
		{ .buffer.type = 3,
		.buffer.length = sizeof(muid),
		.buffer.pointer = muid,
		},
		/* spec says this can be zero to mean "highest revision", but
		* of course there's at least one bios out there which fails
		* unless you pass in exactly the version it supports..
		*/
		{ .integer.type = ACPI_TYPE_INTEGER,
		.integer.value = (version & 0xf0) << 4 \| (version & 0x0f),
		},
		/* MXMS function */
		{ .integer.type = ACPI_TYPE_INTEGER,
		.integer.value = 0x00000010,
		},
		/* Pointer to MXMS arguments */
		{ .buffer.type = ACPI_TYPE_BUFFER,
		.buffer.length = sizeof(mxms_args),
		.buffer.pointer = (char *)mxms_args,
		},
		};
		struct acpi_object_list list = { ARRAY_SIZE(args), args };
		struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
		union acpi_object *obj;
		acpi_handle handle;
		int ret;

		handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
		if (!handle)
		return false;

		ret = acpi_evaluate_object(handle, "_DSM", &list, &retn);
		if (ret) {
		MXM_DBG(dev, "DSM MXMS failed: %d\n", ret);
		return false;
		}

		obj = retn.pointer;
		if (obj->type == ACPI_TYPE_BUFFER) {
		dev_priv->mxms = kmemdup(obj->buffer.pointer,
		obj->buffer.length, GFP_KERNEL);
		} else
		if (obj->type == ACPI_TYPE_INTEGER) {
		MXM_DBG(dev, "DSM MXMS returned 0x%llx\n", obj->integer.value);
		}

		kfree(obj);
		return dev_priv->mxms != NULL;
		}
		#endif

		#if defined(CONFIG_ACPI_WMI) \|\| defined(CONFIG_ACPI_WMI_MODULE)

		#define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
		@@ -521,7 +578,9 @@ struct mxm_shadow_h {
		bool (exec)(struct drm_device , u8 version);
		} _mxm_shadow[] = {
		{ "ROM", mxm_shadow_rom },
		#if defined(CONFIG_ACPI)
		{ "DSM", mxm_shadow_dsm },
		#endif
		#if defined(CONFIG_ACPI_WMI) \|\| defined(CONFIG_ACPI_WMI_MODULE)
		{ "WMI", mxm_shadow_wmi },
		#endif