drm/radeon: add initial support for ATCS ACPI methods

Just verify the interface and track what functions are
supported.  Not actually used yet.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2012-08-16 11:13:43 -04:00
Родитель 82e029357d
Коммит e3a1592085
2 изменённых файлов: 138 добавлений и 1 удалений

Просмотреть файл

@ -1464,6 +1464,17 @@ struct radeon_atif {
struct radeon_encoder *backlight_ctl;
};
struct radeon_atcs_functions {
bool get_ext_state;
bool pcie_perf_req;
bool pcie_dev_rdy;
bool pcie_bus_width;
};
struct radeon_atcs {
struct radeon_atcs_functions functions;
};
/*
* Core structure, functions and helpers.
*/
@ -1557,6 +1568,7 @@ struct radeon_device {
struct mutex gpu_clock_mutex;
/* ACPI interface */
struct radeon_atif atif;
struct radeon_atcs atcs;
};
int radeon_device_init(struct radeon_device *rdev,

Просмотреть файл

@ -74,6 +74,12 @@ struct atif_sbios_requests {
#define ATIF_NOTIFY_81 1
#define ATIF_NOTIFY_N 2
struct atcs_verify_interface {
u16 size; /* structure size in bytes (includes size field) */
u16 version; /* version */
u32 function_bits; /* supported functions bit vector */
} __packed;
/* Call the ATIF method
*/
/**
@ -383,6 +389,118 @@ int radeon_atif_handler(struct radeon_device *rdev,
return NOTIFY_BAD;
}
/* Call the ATCS method
*/
/**
* radeon_atcs_call - call an ATCS method
*
* @handle: acpi handle
* @function: the ATCS function to execute
* @params: ATCS function params
*
* Executes the requested ATCS function (all asics).
* Returns a pointer to the acpi output buffer.
*/
static union acpi_object *radeon_atcs_call(acpi_handle handle, int function,
struct acpi_buffer *params)
{
acpi_status status;
union acpi_object atcs_arg_elements[2];
struct acpi_object_list atcs_arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
atcs_arg.count = 2;
atcs_arg.pointer = &atcs_arg_elements[0];
atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
atcs_arg_elements[0].integer.value = function;
if (params) {
atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
atcs_arg_elements[1].buffer.length = params->length;
atcs_arg_elements[1].buffer.pointer = params->pointer;
} else {
/* We need a second fake parameter */
atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
atcs_arg_elements[1].integer.value = 0;
}
status = acpi_evaluate_object(handle, "ATCS", &atcs_arg, &buffer);
/* Fail only if calling the method fails and ATIF is supported */
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
acpi_format_exception(status));
kfree(buffer.pointer);
return NULL;
}
return buffer.pointer;
}
/**
* radeon_atcs_parse_functions - parse supported functions
*
* @f: supported functions struct
* @mask: supported functions mask from ATCS
*
* Use the supported functions mask from ATCS function
* ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
* are supported (all asics).
*/
static void radeon_atcs_parse_functions(struct radeon_atcs_functions *f, u32 mask)
{
f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
}
/**
* radeon_atcs_verify_interface - verify ATCS
*
* @handle: acpi handle
* @atcs: radeon atcs struct
*
* Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
* to initialize ATCS and determine what features are supported
* (all asics).
* returns 0 on success, error on failure.
*/
static int radeon_atcs_verify_interface(acpi_handle handle,
struct radeon_atcs *atcs)
{
union acpi_object *info;
struct atcs_verify_interface output;
size_t size;
int err = 0;
info = radeon_atcs_call(handle, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
if (!info)
return -EIO;
memset(&output, 0, sizeof(output));
size = *(u16 *) info->buffer.pointer;
if (size < 8) {
DRM_INFO("ATCS buffer is too small: %lu\n", size);
err = -EINVAL;
goto out;
}
size = min(sizeof(output), size);
memcpy(&output, info->buffer.pointer, size);
/* TODO: check version? */
DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
radeon_atcs_parse_functions(&atcs->functions, output.function_bits);
out:
kfree(info);
return err;
}
/**
* radeon_acpi_event - handle notify events
*
@ -428,6 +546,7 @@ int radeon_acpi_init(struct radeon_device *rdev)
{
acpi_handle handle;
struct radeon_atif *atif = &rdev->atif;
struct radeon_atcs *atcs = &rdev->atcs;
int ret;
/* Get the device handle */
@ -437,10 +556,16 @@ int radeon_acpi_init(struct radeon_device *rdev)
if (!ASIC_IS_AVIVO(rdev) || !rdev->bios || !handle)
return 0;
/* Call the ATCS method */
ret = radeon_atcs_verify_interface(handle, atcs);
if (ret) {
DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
}
/* Call the ATIF method */
ret = radeon_atif_verify_interface(handle, atif);
if (ret) {
DRM_DEBUG_DRIVER("Call to verify_interface failed: %d\n", ret);
DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
goto out;
}