From d5c3d79e5ec6219fb20bf358d1e1bbaea1c36591 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Thu, 19 Dec 2013 20:38:20 +0800 Subject: [PATCH] ACPI / i915: replace open-coded _DSM code with helper functions Use helper functions to simplify _DSM related code in i915 driver. Function intel_dsm() is used to check functions supported by ACPI _DSM method, but it has strange check for special value 0x80000002. After digging into nouveau driver, I think the check is copied from nouveau driver and is useless for i915 driver, so remove it. Acked-by: Daniel Vetter Signed-off-by: Jiang Liu Signed-off-by: Rafael J. Wysocki --- drivers/gpu/drm/i915/intel_acpi.c | 144 +++++++----------------------- 1 file changed, 30 insertions(+), 114 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c index dfff0907f70..1bfac94adb3 100644 --- a/drivers/gpu/drm/i915/intel_acpi.c +++ b/drivers/gpu/drm/i915/intel_acpi.c @@ -12,8 +12,6 @@ #include "i915_drv.h" #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ - -#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */ #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ static struct intel_dsm_priv { @@ -28,61 +26,6 @@ static const u8 intel_dsm_guid[] = { 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c }; -static int intel_dsm(acpi_handle handle, int func) -{ - struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; - struct acpi_object_list input; - union acpi_object params[4]; - union acpi_object *obj; - u32 result; - int ret = 0; - - input.count = 4; - input.pointer = params; - params[0].type = ACPI_TYPE_BUFFER; - params[0].buffer.length = sizeof(intel_dsm_guid); - params[0].buffer.pointer = (char *)intel_dsm_guid; - params[1].type = ACPI_TYPE_INTEGER; - params[1].integer.value = INTEL_DSM_REVISION_ID; - params[2].type = ACPI_TYPE_INTEGER; - params[2].integer.value = func; - params[3].type = ACPI_TYPE_PACKAGE; - params[3].package.count = 0; - params[3].package.elements = NULL; - - ret = acpi_evaluate_object(handle, "_DSM", &input, &output); - if (ret) { - DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); - return ret; - } - - obj = (union acpi_object *)output.pointer; - - result = 0; - switch (obj->type) { - case ACPI_TYPE_INTEGER: - result = obj->integer.value; - break; - - case ACPI_TYPE_BUFFER: - if (obj->buffer.length == 4) { - result = (obj->buffer.pointer[0] | - (obj->buffer.pointer[1] << 8) | - (obj->buffer.pointer[2] << 16) | - (obj->buffer.pointer[3] << 24)); - break; - } - default: - ret = -EINVAL; - break; - } - if (result == 0x80000002) - ret = -ENODEV; - - kfree(output.pointer); - return ret; -} - static char *intel_dsm_port_name(u8 id) { switch (id) { @@ -137,83 +80,56 @@ static char *intel_dsm_mux_type(u8 type) static void intel_dsm_platform_mux_info(void) { - struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; - struct acpi_object_list input; - union acpi_object params[4]; - union acpi_object *pkg; - int i, ret; - - input.count = 4; - input.pointer = params; - params[0].type = ACPI_TYPE_BUFFER; - params[0].buffer.length = sizeof(intel_dsm_guid); - params[0].buffer.pointer = (char *)intel_dsm_guid; - params[1].type = ACPI_TYPE_INTEGER; - params[1].integer.value = INTEL_DSM_REVISION_ID; - params[2].type = ACPI_TYPE_INTEGER; - params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO; - params[3].type = ACPI_TYPE_PACKAGE; - params[3].package.count = 0; - params[3].package.elements = NULL; - - ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input, - &output); - if (ret) { - DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret); - goto out; + int i; + union acpi_object *pkg, *connector_count; + + pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, + INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO, + NULL, ACPI_TYPE_PACKAGE); + if (!pkg) { + DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); + return; } - pkg = (union acpi_object *)output.pointer; - - if (pkg->type == ACPI_TYPE_PACKAGE) { - union acpi_object *connector_count = &pkg->package.elements[0]; - DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", - (unsigned long long)connector_count->integer.value); - for (i = 1; i < pkg->package.count; i++) { - union acpi_object *obj = &pkg->package.elements[i]; - union acpi_object *connector_id = - &obj->package.elements[0]; - union acpi_object *info = &obj->package.elements[1]; - DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", - (unsigned long long)connector_id->integer.value); - DRM_DEBUG_DRIVER(" port id: %s\n", - intel_dsm_port_name(info->buffer.pointer[0])); - DRM_DEBUG_DRIVER(" display mux info: %s\n", - intel_dsm_mux_type(info->buffer.pointer[1])); - DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", - intel_dsm_mux_type(info->buffer.pointer[2])); - DRM_DEBUG_DRIVER(" hpd mux info: %s\n", - intel_dsm_mux_type(info->buffer.pointer[3])); - } + connector_count = &pkg->package.elements[0]; + DRM_DEBUG_DRIVER("MUX info connectors: %lld\n", + (unsigned long long)connector_count->integer.value); + for (i = 1; i < pkg->package.count; i++) { + union acpi_object *obj = &pkg->package.elements[i]; + union acpi_object *connector_id = &obj->package.elements[0]; + union acpi_object *info = &obj->package.elements[1]; + DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n", + (unsigned long long)connector_id->integer.value); + DRM_DEBUG_DRIVER(" port id: %s\n", + intel_dsm_port_name(info->buffer.pointer[0])); + DRM_DEBUG_DRIVER(" display mux info: %s\n", + intel_dsm_mux_type(info->buffer.pointer[1])); + DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n", + intel_dsm_mux_type(info->buffer.pointer[2])); + DRM_DEBUG_DRIVER(" hpd mux info: %s\n", + intel_dsm_mux_type(info->buffer.pointer[3])); } -out: - kfree(output.pointer); + ACPI_FREE(pkg); } static bool intel_dsm_pci_probe(struct pci_dev *pdev) { acpi_handle dhandle; - int ret; dhandle = ACPI_HANDLE(&pdev->dev); if (!dhandle) return false; - if (!acpi_has_method(dhandle, "_DSM")) { + if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, + 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { DRM_DEBUG_KMS("no _DSM method for intel device\n"); return false; } - ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS); - if (ret < 0) { - DRM_DEBUG_KMS("failed to get supported _DSM functions\n"); - return false; - } - intel_dsm_priv.dhandle = dhandle; - intel_dsm_platform_mux_info(); + return true; } -- 2.46.0