diff options
Diffstat (limited to 'drivers/gpu/drm/amd/pm/powerplay/smumgr/smu7_smumgr.c')
| -rw-r--r-- | drivers/gpu/drm/amd/pm/powerplay/smumgr/smu7_smumgr.c | 601 |
1 files changed, 601 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/pm/powerplay/smumgr/smu7_smumgr.c b/drivers/gpu/drm/amd/pm/powerplay/smumgr/smu7_smumgr.c new file mode 100644 index 000000000000..aae25243eb10 --- /dev/null +++ b/drivers/gpu/drm/amd/pm/powerplay/smumgr/smu7_smumgr.c @@ -0,0 +1,601 @@ +/* + * Copyright 2015 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + */ + + +#include "pp_debug.h" +#include "smumgr.h" +#include "smu_ucode_xfer_vi.h" +#include "ppatomctrl.h" +#include "cgs_common.h" +#include "smu7_ppsmc.h" +#include "smu7_smumgr.h" +#include "smu7_common.h" + +#include "polaris10_pwrvirus.h" + +#define SMU7_SMC_SIZE 0x20000 + +static int smu7_set_smc_sram_address(struct pp_hwmgr *hwmgr, uint32_t smc_addr, uint32_t limit) +{ + PP_ASSERT_WITH_CODE((0 == (3 & smc_addr)), "SMC address must be 4 byte aligned.", return -EINVAL); + PP_ASSERT_WITH_CODE((limit > (smc_addr + 3)), "SMC addr is beyond the SMC RAM area.", return -EINVAL); + + cgs_write_register(hwmgr->device, mmSMC_IND_INDEX_11, smc_addr); + PHM_WRITE_FIELD(hwmgr->device, SMC_IND_ACCESS_CNTL, AUTO_INCREMENT_IND_11, 0); /* on ci, SMC_IND_ACCESS_CNTL is different */ + return 0; +} + + +int smu7_copy_bytes_from_smc(struct pp_hwmgr *hwmgr, uint32_t smc_start_address, uint32_t *dest, uint32_t byte_count, uint32_t limit) +{ + uint32_t data; + uint32_t addr; + uint8_t *dest_byte; + uint8_t i, data_byte[4] = {0}; + uint32_t *pdata = (uint32_t *)&data_byte; + + PP_ASSERT_WITH_CODE((0 == (3 & smc_start_address)), "SMC address must be 4 byte aligned.", return -EINVAL); + PP_ASSERT_WITH_CODE((limit > (smc_start_address + byte_count)), "SMC address is beyond the SMC RAM area.", return -EINVAL); + + addr = smc_start_address; + + while (byte_count >= 4) { + smu7_read_smc_sram_dword(hwmgr, addr, &data, limit); + + *dest = PP_SMC_TO_HOST_UL(data); + + dest += 1; + byte_count -= 4; + addr += 4; + } + + if (byte_count) { + smu7_read_smc_sram_dword(hwmgr, addr, &data, limit); + *pdata = PP_SMC_TO_HOST_UL(data); + /* Cast dest into byte type in dest_byte. This way, we don't overflow if the allocated memory is not 4-byte aligned. */ + dest_byte = (uint8_t *)dest; + for (i = 0; i < byte_count; i++) + dest_byte[i] = data_byte[i]; + } + + return 0; +} + + +int smu7_copy_bytes_to_smc(struct pp_hwmgr *hwmgr, uint32_t smc_start_address, + const uint8_t *src, uint32_t byte_count, uint32_t limit) +{ + int result; + uint32_t data = 0; + uint32_t original_data; + uint32_t addr = 0; + uint32_t extra_shift; + + PP_ASSERT_WITH_CODE((0 == (3 & smc_start_address)), "SMC address must be 4 byte aligned.", return -EINVAL); + PP_ASSERT_WITH_CODE((limit > (smc_start_address + byte_count)), "SMC address is beyond the SMC RAM area.", return -EINVAL); + + addr = smc_start_address; + + while (byte_count >= 4) { + /* Bytes are written into the SMC addres space with the MSB first. */ + data = src[0] * 0x1000000 + src[1] * 0x10000 + src[2] * 0x100 + src[3]; + + result = smu7_set_smc_sram_address(hwmgr, addr, limit); + + if (0 != result) + return result; + + cgs_write_register(hwmgr->device, mmSMC_IND_DATA_11, data); + + src += 4; + byte_count -= 4; + addr += 4; + } + + if (0 != byte_count) { + + data = 0; + + result = smu7_set_smc_sram_address(hwmgr, addr, limit); + + if (0 != result) + return result; + + + original_data = cgs_read_register(hwmgr->device, mmSMC_IND_DATA_11); + + extra_shift = 8 * (4 - byte_count); + + while (byte_count > 0) { + /* Bytes are written into the SMC addres space with the MSB first. */ + data = (0x100 * data) + *src++; + byte_count--; + } + + data <<= extra_shift; + + data |= (original_data & ~((~0UL) << extra_shift)); + + result = smu7_set_smc_sram_address(hwmgr, addr, limit); + + if (0 != result) + return result; + + cgs_write_register(hwmgr->device, mmSMC_IND_DATA_11, data); + } + + return 0; +} + + +int smu7_program_jump_on_start(struct pp_hwmgr *hwmgr) +{ + static const unsigned char data[4] = { 0xE0, 0x00, 0x80, 0x40 }; + + smu7_copy_bytes_to_smc(hwmgr, 0x0, data, 4, sizeof(data)+1); + + return 0; +} + +bool smu7_is_smc_ram_running(struct pp_hwmgr *hwmgr) +{ + return ((0 == PHM_READ_VFPF_INDIRECT_FIELD(hwmgr->device, CGS_IND_REG__SMC, SMC_SYSCON_CLOCK_CNTL_0, ck_disable)) + && (0x20100 <= cgs_read_ind_register(hwmgr->device, CGS_IND_REG__SMC, ixSMC_PC_C))); +} + +int smu7_send_msg_to_smc(struct pp_hwmgr *hwmgr, uint16_t msg) +{ + int ret; + + PHM_WAIT_FIELD_UNEQUAL(hwmgr, SMC_RESP_0, SMC_RESP, 0); + + ret = PHM_READ_FIELD(hwmgr->device, SMC_RESP_0, SMC_RESP); + + if (ret == 0xFE) + pr_debug("last message was not supported\n"); + else if (ret != 1) + pr_info("\n last message was failed ret is %d\n", ret); + + cgs_write_register(hwmgr->device, mmSMC_RESP_0, 0); + cgs_write_register(hwmgr->device, mmSMC_MESSAGE_0, msg); + + PHM_WAIT_FIELD_UNEQUAL(hwmgr, SMC_RESP_0, SMC_RESP, 0); + + ret = PHM_READ_FIELD(hwmgr->device, SMC_RESP_0, SMC_RESP); + + if (ret == 0xFE) + pr_debug("message %x was not supported\n", msg); + else if (ret != 1) + pr_info("\n failed to send message %x ret is %d \n", msg, ret); + + return 0; +} + +int smu7_send_msg_to_smc_with_parameter(struct pp_hwmgr *hwmgr, uint16_t msg, uint32_t parameter) +{ + PHM_WAIT_FIELD_UNEQUAL(hwmgr, SMC_RESP_0, SMC_RESP, 0); + + cgs_write_register(hwmgr->device, mmSMC_MSG_ARG_0, parameter); + + return smu7_send_msg_to_smc(hwmgr, msg); +} + +uint32_t smu7_get_argument(struct pp_hwmgr *hwmgr) +{ + return cgs_read_register(hwmgr->device, mmSMC_MSG_ARG_0); +} + +int smu7_send_msg_to_smc_offset(struct pp_hwmgr *hwmgr) +{ + return smum_send_msg_to_smc_with_parameter(hwmgr, PPSMC_MSG_Test, 0x20000, NULL); +} + +enum cgs_ucode_id smu7_convert_fw_type_to_cgs(uint32_t fw_type) +{ + enum cgs_ucode_id result = CGS_UCODE_ID_MAXIMUM; + + switch (fw_type) { + case UCODE_ID_SMU: + result = CGS_UCODE_ID_SMU; + break; + case UCODE_ID_SMU_SK: + result = CGS_UCODE_ID_SMU_SK; + break; + case UCODE_ID_SDMA0: + result = CGS_UCODE_ID_SDMA0; + break; + case UCODE_ID_SDMA1: + result = CGS_UCODE_ID_SDMA1; + break; + case UCODE_ID_CP_CE: + result = CGS_UCODE_ID_CP_CE; + break; + case UCODE_ID_CP_PFP: + result = CGS_UCODE_ID_CP_PFP; + break; + case UCODE_ID_CP_ME: + result = CGS_UCODE_ID_CP_ME; + break; + case UCODE_ID_CP_MEC: + result = CGS_UCODE_ID_CP_MEC; + break; + case UCODE_ID_CP_MEC_JT1: + result = CGS_UCODE_ID_CP_MEC_JT1; + break; + case UCODE_ID_CP_MEC_JT2: + result = CGS_UCODE_ID_CP_MEC_JT2; + break; + case UCODE_ID_RLC_G: + result = CGS_UCODE_ID_RLC_G; + break; + case UCODE_ID_MEC_STORAGE: + result = CGS_UCODE_ID_STORAGE; + break; + default: + break; + } + + return result; +} + + +int smu7_read_smc_sram_dword(struct pp_hwmgr *hwmgr, uint32_t smc_addr, uint32_t *value, uint32_t limit) +{ + int result; + + result = smu7_set_smc_sram_address(hwmgr, smc_addr, limit); + + *value = result ? 0 : cgs_read_register(hwmgr->device, mmSMC_IND_DATA_11); + + return result; +} + +int smu7_write_smc_sram_dword(struct pp_hwmgr *hwmgr, uint32_t smc_addr, uint32_t value, uint32_t limit) +{ + int result; + + result = smu7_set_smc_sram_address(hwmgr, smc_addr, limit); + + if (result) + return result; + + cgs_write_register(hwmgr->device, mmSMC_IND_DATA_11, value); + + return 0; +} + +static int smu7_populate_single_firmware_entry(struct pp_hwmgr *hwmgr, + uint32_t fw_type, + struct SMU_Entry *entry) +{ + int result = 0; + struct cgs_firmware_info info = {0}; + + result = cgs_get_firmware_info(hwmgr->device, + smu7_convert_fw_type_to_cgs(fw_type), + &info); + + if (!result) { + entry->version = info.fw_version; + entry->id = (uint16_t)fw_type; + entry->image_addr_high = upper_32_bits(info.mc_addr); + entry->image_addr_low = lower_32_bits(info.mc_addr); + entry->meta_data_addr_high = 0; + entry->meta_data_addr_low = 0; + + /* digest need be excluded out */ + if (!hwmgr->not_vf) + info.image_size -= 20; + entry->data_size_byte = info.image_size; + entry->num_register_entries = 0; + } + + if ((fw_type == UCODE_ID_RLC_G) + || (fw_type == UCODE_ID_CP_MEC)) + entry->flags = 1; + else + entry->flags = 0; + + return 0; +} + +int smu7_request_smu_load_fw(struct pp_hwmgr *hwmgr) +{ + struct smu7_smumgr *smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend); + uint32_t fw_to_load; + int r = 0; + + amdgpu_ucode_init_bo(hwmgr->adev); + + if (smu_data->soft_regs_start) + cgs_write_ind_register(hwmgr->device, CGS_IND_REG__SMC, + smu_data->soft_regs_start + smum_get_offsetof(hwmgr, + SMU_SoftRegisters, UcodeLoadStatus), + 0x0); + + if (hwmgr->chip_id > CHIP_TOPAZ) { /* add support for Topaz */ + if (hwmgr->not_vf) { + smum_send_msg_to_smc_with_parameter(hwmgr, + PPSMC_MSG_SMU_DRAM_ADDR_HI, + upper_32_bits(smu_data->smu_buffer.mc_addr), + NULL); + smum_send_msg_to_smc_with_parameter(hwmgr, + PPSMC_MSG_SMU_DRAM_ADDR_LO, + lower_32_bits(smu_data->smu_buffer.mc_addr), + NULL); + } + fw_to_load = UCODE_ID_RLC_G_MASK + + UCODE_ID_SDMA0_MASK + + UCODE_ID_SDMA1_MASK + + UCODE_ID_CP_CE_MASK + + UCODE_ID_CP_ME_MASK + + UCODE_ID_CP_PFP_MASK + + UCODE_ID_CP_MEC_MASK; + } else { + fw_to_load = UCODE_ID_RLC_G_MASK + + UCODE_ID_SDMA0_MASK + + UCODE_ID_SDMA1_MASK + + UCODE_ID_CP_CE_MASK + + UCODE_ID_CP_ME_MASK + + UCODE_ID_CP_PFP_MASK + + UCODE_ID_CP_MEC_MASK + + UCODE_ID_CP_MEC_JT1_MASK + + UCODE_ID_CP_MEC_JT2_MASK; + } + + if (!smu_data->toc) { + struct SMU_DRAMData_TOC *toc; + + smu_data->toc = kzalloc(sizeof(struct SMU_DRAMData_TOC), GFP_KERNEL); + if (!smu_data->toc) + return -ENOMEM; + toc = smu_data->toc; + toc->num_entries = 0; + toc->structure_version = 1; + + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_RLC_G, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_CP_CE, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_CP_PFP, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_CP_ME, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_CP_MEC, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_CP_MEC_JT1, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_CP_MEC_JT2, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_SDMA0, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_SDMA1, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + if (!hwmgr->not_vf) + PP_ASSERT_WITH_CODE(0 == smu7_populate_single_firmware_entry(hwmgr, + UCODE_ID_MEC_STORAGE, &toc->entry[toc->num_entries++]), + "Failed to Get Firmware Entry.", r = -EINVAL; goto failed); + } + memcpy_toio(smu_data->header_buffer.kaddr, smu_data->toc, + sizeof(struct SMU_DRAMData_TOC)); + smum_send_msg_to_smc_with_parameter(hwmgr, + PPSMC_MSG_DRV_DRAM_ADDR_HI, + upper_32_bits(smu_data->header_buffer.mc_addr), + NULL); + smum_send_msg_to_smc_with_parameter(hwmgr, + PPSMC_MSG_DRV_DRAM_ADDR_LO, + lower_32_bits(smu_data->header_buffer.mc_addr), + NULL); + + smum_send_msg_to_smc_with_parameter(hwmgr, PPSMC_MSG_LoadUcodes, fw_to_load, NULL); + + r = smu7_check_fw_load_finish(hwmgr, fw_to_load); + if (!r) + return 0; + + pr_err("SMU load firmware failed\n"); + +failed: + kfree(smu_data->toc); + smu_data->toc = NULL; + return r; +} + +/* Check if the FW has been loaded, SMU will not return if loading has not finished. */ +int smu7_check_fw_load_finish(struct pp_hwmgr *hwmgr, uint32_t fw_type) +{ + struct smu7_smumgr *smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend); + uint32_t ret; + + ret = phm_wait_on_indirect_register(hwmgr, mmSMC_IND_INDEX_11, + smu_data->soft_regs_start + smum_get_offsetof(hwmgr, + SMU_SoftRegisters, UcodeLoadStatus), + fw_type, fw_type); + return ret; +} + +int smu7_reload_firmware(struct pp_hwmgr *hwmgr) +{ + return hwmgr->smumgr_funcs->start_smu(hwmgr); +} + +static int smu7_upload_smc_firmware_data(struct pp_hwmgr *hwmgr, uint32_t length, uint32_t *src, uint32_t limit) +{ + uint32_t byte_count = length; + + PP_ASSERT_WITH_CODE((limit >= byte_count), "SMC address is beyond the SMC RAM area.", return -EINVAL); + + cgs_write_register(hwmgr->device, mmSMC_IND_INDEX_11, 0x20000); + PHM_WRITE_FIELD(hwmgr->device, SMC_IND_ACCESS_CNTL, AUTO_INCREMENT_IND_11, 1); + + for (; byte_count >= 4; byte_count -= 4) + cgs_write_register(hwmgr->device, mmSMC_IND_DATA_11, *src++); + + PHM_WRITE_FIELD(hwmgr->device, SMC_IND_ACCESS_CNTL, AUTO_INCREMENT_IND_11, 0); + + PP_ASSERT_WITH_CODE((0 == byte_count), "SMC size must be divisible by 4.", return -EINVAL); + + return 0; +} + + +int smu7_upload_smu_firmware_image(struct pp_hwmgr *hwmgr) +{ + int result = 0; + struct smu7_smumgr *smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend); + + struct cgs_firmware_info info = {0}; + + if (smu_data->security_hard_key == 1) + cgs_get_firmware_info(hwmgr->device, + smu7_convert_fw_type_to_cgs(UCODE_ID_SMU), &info); + else + cgs_get_firmware_info(hwmgr->device, + smu7_convert_fw_type_to_cgs(UCODE_ID_SMU_SK), &info); + + hwmgr->is_kicker = info.is_kicker; + hwmgr->smu_version = info.version; + result = smu7_upload_smc_firmware_data(hwmgr, info.image_size, (uint32_t *)info.kptr, SMU7_SMC_SIZE); + + return result; +} + +static void execute_pwr_table(struct pp_hwmgr *hwmgr, const PWR_Command_Table *pvirus, int size) +{ + int i; + uint32_t reg, data; + + for (i = 0; i < size; i++) { + reg = pvirus->reg; + data = pvirus->data; + if (reg != 0xffffffff) + cgs_write_register(hwmgr->device, reg, data); + else + break; + pvirus++; + } +} + +static void execute_pwr_dfy_table(struct pp_hwmgr *hwmgr, const PWR_DFY_Section *section) +{ + int i; + + cgs_write_register(hwmgr->device, mmCP_DFY_CNTL, section->dfy_cntl); + cgs_write_register(hwmgr->device, mmCP_DFY_ADDR_HI, section->dfy_addr_hi); + cgs_write_register(hwmgr->device, mmCP_DFY_ADDR_LO, section->dfy_addr_lo); + for (i = 0; i < section->dfy_size; i++) + cgs_write_register(hwmgr->device, mmCP_DFY_DATA_0, section->dfy_data[i]); +} + +int smu7_setup_pwr_virus(struct pp_hwmgr *hwmgr) +{ + execute_pwr_table(hwmgr, pwr_virus_table_pre, ARRAY_SIZE(pwr_virus_table_pre)); + execute_pwr_dfy_table(hwmgr, &pwr_virus_section1); + execute_pwr_dfy_table(hwmgr, &pwr_virus_section2); + execute_pwr_dfy_table(hwmgr, &pwr_virus_section3); + execute_pwr_dfy_table(hwmgr, &pwr_virus_section4); + execute_pwr_dfy_table(hwmgr, &pwr_virus_section5); + execute_pwr_dfy_table(hwmgr, &pwr_virus_section6); + execute_pwr_table(hwmgr, pwr_virus_table_post, ARRAY_SIZE(pwr_virus_table_post)); + + return 0; +} + +int smu7_init(struct pp_hwmgr *hwmgr) +{ + struct smu7_smumgr *smu_data; + int r; + /* Allocate memory for backend private data */ + smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend); + smu_data->header_buffer.data_size = + ((sizeof(struct SMU_DRAMData_TOC) / 4096) + 1) * 4096; + +/* Allocate FW image data structure and header buffer and + * send the header buffer address to SMU */ + r = amdgpu_bo_create_kernel((struct amdgpu_device *)hwmgr->adev, + smu_data->header_buffer.data_size, + PAGE_SIZE, + AMDGPU_GEM_DOMAIN_VRAM, + &smu_data->header_buffer.handle, + &smu_data->header_buffer.mc_addr, + &smu_data->header_buffer.kaddr); + + if (r) + return -EINVAL; + + if (!hwmgr->not_vf) + return 0; + + smu_data->smu_buffer.data_size = 200*4096; + r = amdgpu_bo_create_kernel((struct amdgpu_device *)hwmgr->adev, + smu_data->smu_buffer.data_size, + PAGE_SIZE, + AMDGPU_GEM_DOMAIN_VRAM, + &smu_data->smu_buffer.handle, + &smu_data->smu_buffer.mc_addr, + &smu_data->smu_buffer.kaddr); + + if (r) { + amdgpu_bo_free_kernel(&smu_data->header_buffer.handle, + &smu_data->header_buffer.mc_addr, + &smu_data->header_buffer.kaddr); + return -EINVAL; + } + + if (smum_is_hw_avfs_present(hwmgr) && + (hwmgr->feature_mask & PP_AVFS_MASK)) + hwmgr->avfs_supported = true; + + return 0; +} + + +int smu7_smu_fini(struct pp_hwmgr *hwmgr) +{ + struct smu7_smumgr *smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend); + + amdgpu_bo_free_kernel(&smu_data->header_buffer.handle, + &smu_data->header_buffer.mc_addr, + &smu_data->header_buffer.kaddr); + + if (hwmgr->not_vf) + amdgpu_bo_free_kernel(&smu_data->smu_buffer.handle, + &smu_data->smu_buffer.mc_addr, + &smu_data->smu_buffer.kaddr); + + + kfree(smu_data->toc); + smu_data->toc = NULL; + kfree(hwmgr->smu_backend); + hwmgr->smu_backend = NULL; + return 0; +} |