/**
* amdgpu_atpx_verify_interface - verify ATPX
*
* @atpx: amdgpu atpx struct
*
* Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
* to initialize ATPX and determine what features are supported
* (all asics).
* returns 0 on success, error on failure.
*/
static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx)
{
union acpi_object *info;
struct atpx_verify_interface output;
size_t size;
int err = 0;
info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);
if (!info)
return -EIO;
memset(&output, 0, sizeof(output));
size = *(u16 *) info->buffer.pointer;
if (size < 8) {
printk("ATPX buffer is too small: %zu\n", size);
err = -EINVAL;
goto out;
}
size = min(sizeof(output), size);
memcpy(&output, info->buffer.pointer, size);
/* TODO: check version? */
printk("ATPX version %u, functions 0x%08x\n",
output.version, output.function_bits);
amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits);
out:
kfree(info);
return err;
}
/**
* amdgpu_atpx_validate_functions - validate ATPX functions
*
* @atpx: amdgpu atpx struct
*
* Validate that required functions are enabled (all asics).
* returns 0 on success, error on failure.
*/
static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
{
u32 valid_bits = 0;
if (atpx->functions.px_params) {
union acpi_object *info;
struct atpx_px_params output;
size_t size;
info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
if (!info)
return -EIO;
memset(&output, 0, sizeof(output));
size = *(u16 *) info->buffer.pointer;
if (size < 10) {
printk("ATPX buffer is too small: %zu\n", size);
kfree(info);
return -EINVAL;
}
size = min(sizeof(output), size);
memcpy(&output, info->buffer.pointer, size);
valid_bits = output.flags & output.valid_flags;
kfree(info);
}
/* if separate mux flag is set, mux controls are required */
if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
atpx->functions.i2c_mux_cntl = true;
atpx->functions.disp_mux_cntl = true;
}
/* if any outputs are muxed, mux controls are required */
if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
ATPX_TV_SIGNAL_MUXED |
ATPX_DFP_SIGNAL_MUXED))
atpx->functions.disp_mux_cntl = true;
/* some bioses set these bits rather than flagging power_cntl as supported */
if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |
ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))
atpx->functions.power_cntl = true;
atpx->is_hybrid = false;
if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
printk("ATPX Hybrid Graphics\n");
/*
* Disable legacy PM methods only when pcie port PM is usable,
* otherwise the device might fail to power off or power on.
*/
atpx->functions.power_cntl = !amdgpu_atpx_priv.bridge_pm_usable;
atpx->is_hybrid = true;
}
return 0;
}
/**
* amdgpu_atpx_validate_functions - validate ATPX functions
*
* @atpx: amdgpu atpx struct
*
* Validate that required functions are enabled (all asics).
* returns 0 on success, error on failure.
*/
static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
{
/* make sure required functions are enabled */
/* dGPU power control is required */
atpx->functions.power_cntl = true;
if (atpx->functions.px_params) {
union acpi_object *info;
struct atpx_px_params output;
size_t size;
u32 valid_bits;
info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
if (!info)
return -EIO;
memset(&output, 0, sizeof(output));
size = *(u16 *) info->buffer.pointer;
if (size < 10) {
printk("ATPX buffer is too small: %zu\n", size);
kfree(info);
return -EINVAL;
}
size = min(sizeof(output), size);
memcpy(&output, info->buffer.pointer, size);
valid_bits = output.flags & output.valid_flags;
/* if separate mux flag is set, mux controls are required */
if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
atpx->functions.i2c_mux_cntl = true;
atpx->functions.disp_mux_cntl = true;
}
/* if any outputs are muxed, mux controls are required */
if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
ATPX_TV_SIGNAL_MUXED |
ATPX_DFP_SIGNAL_MUXED))
atpx->functions.disp_mux_cntl = true;
kfree(info);
}
return 0;
}
/**
* amdgpu_atpx_switch_end - notify the sbios of a GPU switch
*
* @atpx: atpx info struct
* @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
*
* Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX
* function to notify the sbios that a switch between the discrete GPU and
* integrated GPU has ended (all asics).
* Returns 0 on success, error on failure.
*/
static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id)
{
struct acpi_buffer params;
union acpi_object *info;
struct atpx_mux input;
if (atpx->functions.switch_end) {
input.size = 4;
input.mux = mux_id;
params.length = input.size;
params.pointer = &input;
info = amdgpu_atpx_call(atpx->handle,
ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,
¶ms);
if (!info)
return -EIO;
kfree(info);
}
return 0;
}
/**
* amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux
*
* @atpx: atpx info struct
* @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU)
*
* Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to
* switch the i2c/hpd mux between the discrete GPU and integrated GPU
* (all asics).
* Returns 0 on success, error on failure.
*/
static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id)
{
struct acpi_buffer params;
union acpi_object *info;
struct atpx_mux input;
if (atpx->functions.i2c_mux_cntl) {
input.size = 4;
input.mux = mux_id;
params.length = input.size;
params.pointer = &input;
info = amdgpu_atpx_call(atpx->handle,
ATPX_FUNCTION_I2C_MUX_CONTROL,
¶ms);
if (!info)
return -EIO;
kfree(info);
}
return 0;
}
/**
* amdgpu_atpx_set_discrete_state - power up/down discrete GPU
*
* @atpx: atpx info struct
* @state: discrete GPU state (0 = power down, 1 = power up)
*
* Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to
* power down/up the discrete GPU (all asics).
* Returns 0 on success, error on failure.
*/
static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state)
{
struct acpi_buffer params;
union acpi_object *info;
struct atpx_power_control input;
if (atpx->functions.power_cntl) {
input.size = 3;
input.dgpu_state = state;
params.length = input.size;
params.pointer = &input;
info = amdgpu_atpx_call(atpx->handle,
ATPX_FUNCTION_POWER_CONTROL,
¶ms);
if (!info)
return -EIO;
kfree(info);
}
return 0;
}
