mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
dfa13ebbe3
Currently, there is core support for tuning during initialization. There can also be a need to re-tune periodically (e.g. sdhci) or to re-tune after the host controller is powered off (e.g. after PM runtime suspend / resume) or to re-tune in response to CRC errors. The main requirements for re-tuning are: - ability to enable / disable re-tuning - ability to flag that re-tuning is needed - ability to re-tune before any request - ability to hold off re-tuning if the card is busy - ability to hold off re-tuning if re-tuning is in progress - ability to run a re-tuning timer To support those requirements 7 members are added to struct mmc_host: unsigned int can_retune:1; /* re-tuning can be used */ unsigned int doing_retune:1; /* re-tuning in progress */ unsigned int retune_now:1; /* do re-tuning at next req */ int need_retune; /* re-tuning is needed */ int hold_retune; /* hold off re-tuning */ unsigned int retune_period; /* re-tuning period in secs */ struct timer_list retune_timer; /* for periodic re-tuning */ need_retune is an integer so it can be set without needing synchronization. hold_retune is a integer to allow nesting. Various simple functions are provided to set / clear those variables. Subsequent patches take those functions into use. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
26 lines
714 B
C
26 lines
714 B
C
/*
|
|
* linux/drivers/mmc/core/host.h
|
|
*
|
|
* Copyright (C) 2003 Russell King, All Rights Reserved.
|
|
* Copyright 2007 Pierre Ossman
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef _MMC_CORE_HOST_H
|
|
#define _MMC_CORE_HOST_H
|
|
#include <linux/mmc/host.h>
|
|
|
|
int mmc_register_host_class(void);
|
|
void mmc_unregister_host_class(void);
|
|
|
|
void mmc_retune_enable(struct mmc_host *host);
|
|
void mmc_retune_disable(struct mmc_host *host);
|
|
void mmc_retune_hold(struct mmc_host *host);
|
|
void mmc_retune_release(struct mmc_host *host);
|
|
int mmc_retune(struct mmc_host *host);
|
|
|
|
#endif
|
|
|