ufshcd_system_resume(9)

Okay bestie, welcome to ufshcd_system_resume(9) from the Kernel API Manual — yes, that exact page, and we're gonna make it make sense. 💅

🌸 NAME 🌸

ufshcd_system_resume — the system resume callback. That's the name, that's the job, periodt. ✨

📜 SYNOPSIS 📜

Here's the signature, character for character:

int ufshcd_system_resume (struct device *dev );

🧚 ARGUMENTS 🧚

• dev — device associated with the UFS controller. This is the device your callback is tied to, bestie. 🫶

✨ DESCRIPTION ✨

This callback is executed after waking the system up from a sleep state in which the contents of main memory were preserved. So the system was asleep but the contents of main memory were kept, and now it's awake — this is the callback that runs after that wake-up. No extra lore, that's the description. 😭✨

🎀 RETURN 🎀

0 for success and non-zero for failure. Slay if it's 0; if it's non-zero, that's a fail and you deal with it. 💀

🌈 SEE ALSO 🌈

Kernel file: ./drivers/ufs/core/ufshcd.c. And the whole SEE ALSO friend group, in order, no cap:

ufshcd_enable_intr(9), ufshcd_disable_intr(9),
ufshcd_print_trs_all(9), ufshcd_print_pwr_info(9),
ufshcd_wait_for_register(9), ufshcd_get_intr_mask(9),
ufshcd_get_ufs_version(9), ufshcd_is_device_present(9),
ufshcd_get_tr_ocs(9), ufshcd_utrl_clear(9),
ufshcd_utmrl_clear(9), ufshcd_get_lists_status(9),
ufshcd_get_req_rsp(9), ufshcd_is_exception_event(9),
ufshcd_reset_intr_aggr(9), ufshcd_config_intr_aggr(9),
ufshcd_disable_intr_aggr(9), ufshcd_enable_run_stop_reg(9),
ufshcd_hba_start(9), ufshcd_is_hba_active(9),
ufshcd_pm_qos_init(9), ufshcd_pm_qos_exit(9),
ufshcd_pm_qos_update(9), ufshcd_set_clk_freq(9),
ufshcd_scale_clks(9), ufshcd_is_devfreq_scaling_required(9),
ufshcd_pause_command_processing(9), ufshcd_resume_command_processing(9),
ufshcd_scale_gear(9), ufshcd_devfreq_scale(9),
ufshcd_hold(9), ufshcd_send_command(9),
ufshcd_copy_sense_data(9), ufshcd_copy_query_response(9),
ufshcd_hba_capabilities(9), ufshcd_ready_for_uic_cmd(9),
ufshcd_get_upmcrs(9), ufshcd_dispatch_uic_cmd(9),
ufshcd_wait_for_uic_cmd(9), __ufshcd_send_uic_cmd(9),
ufshcd_send_uic_cmd(9), ufshcd_sgl_to_prdt(9),
ufshcd_map_sg(9), ufshcd_prepare_req_desc_hdr(9),
ufshcd_prepare_utp_scsi_cmd_upiu(9),
ufshcd_prepare_utp_query_req_upiu(9),
ufshcd_compose_devman_upiu(9), ufshcd_comp_scsi_upiu(9),
ufshcd_upiu_wlun_to_scsi_wlun(9), ufshcd_queuecommand(9),
ufshcd_dev_cmd_completion(9), ufshcd_exec_dev_cmd(9),
ufshcd_init_query(9), ufshcd_query_flag(9),
ufshcd_query_attr(9), ufshcd_query_attr_retry(9),
ufshcd_query_attr_qword(9), ufshcd_query_descriptor_retry(9),
ufshcd_read_desc_param(9), struct uc_string_id(9),
ufshcd_read_string_desc(9), ufshcd_read_unit_desc_param(9),
ufshcd_memory_alloc(9), ufshcd_host_memory_configure(9),
ufshcd_dme_link_startup(9), ufshcd_dme_reset(9),
ufshcd_dme_enable(9), ufshcd_dme_set_attr(9),
ufshcd_dme_get_attr(9), ufshcd_dme_rmw(9),
ufshcd_uic_pwr_ctrl(9), ufshcd_uic_tx_eqtr(9),
ufshcd_send_bsg_uic_cmd(9), ufshcd_uic_change_pwr_mode(9),
ufshcd_get_max_pwr_mode(9), ufshcd_dme_change_power_mode(9),
ufshcd_change_power_mode(9), ufshcd_config_pwr_mode(9),
ufshcd_complete_dev_init(9), ufshcd_make_hba_operational(9),
ufshcd_hba_stop(9), ufshcd_hba_execute_hce(9),
ufshcd_link_startup(9), ufshcd_verify_dev_init(9),
ufshcd_setup_links(9), ufshcd_lu_init(9),
ufshcd_sdev_init(9), ufshcd_change_queue_depth(9),
ufshcd_sdev_configure(9), ufshcd_sdev_destroy(9),
ufshcd_scsi_cmd_status(9), ufshcd_transfer_rsp_status(9),
ufshcd_uic_cmd_compl(9), ufshcd_compl_one_cqe(9),
__ufshcd_transfer_req_compl(9), ufshcd_mcq_compl_pending_transfer(9),
ufshcd_transfer_req_compl(9), ufshcd_disable_ee(9),
ufshcd_enable_ee(9), ufshcd_enable_auto_bkops(9),
ufshcd_disable_auto_bkops(9), ufshcd_force_reset_auto_bkops(9),
ufshcd_bkops_ctrl(9), ufshcd_exception_event_handler(9),
ufshcd_quirk_dl_nac_errors(9), ufshcd_abort_all(9),
ufshcd_err_handler(9), ufshcd_update_uic_error(9),
ufshcd_check_errors(9), ufshcd_tmc_handler(9),
ufshcd_handle_mcq_cq_events(9), ufshcd_sl_intr(9),
ufshcd_intr(9), ufshcd_issue_tm_cmd(9),
ufshcd_issue_devman_upiu_cmd(9), ufshcd_exec_raw_upiu_cmd(9),
ufshcd_advanced_rpmb_req_handler(9), ufshcd_eh_device_reset_handler(9),
ufshcd_try_to_abort_task(9), ufshcd_abort(9),
ufshcd_process_probe_result(9), ufshcd_host_reset_and_restore(9),
ufshcd_reset_and_restore(9), ufshcd_eh_host_reset_handler(9),
ufshcd_get_max_icc_level(9), ufshcd_find_max_sup_active_icc_level(9),
ufshcd_scsi_add_wlus(9), ufshcd_create_device_id(9),
ufshcd_quirk_tune_host_pa_tactivate(9), ufshcd_quirk_override_pa_h8time(9),
ufshcd_add_lus(9), ufshcd_get_op_mode(9),
ufshcd_probe_hba(9), ufshcd_async_scan(9),
ufshcd_set_dev_pwr_mode(9), ufshcd_suspend(9),
ufshcd_resume(9), ufshcd_system_suspend(9),
ufshcd_runtime_suspend(9), ufshcd_runtime_resume(9),
ufshcd_remove(9), ufshcd_set_dma_mask(9),
ufshcd_devres_release(9), ufshcd_alloc_host(9),
ufshcd_init(9)

That's the whole page! Signed off with 💖 from ./drivers/ufs/core, dated October 2026, and it's all about ufshcd_system_resume(9). Go be the main character of system resume, bestie! 🎀🦋