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mmc: sdhci: Introduce new flag SDHCI_USING_RETUNING_TIMER

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Add a new flag of SDHCI_USING_RETUNING_TIMER to represent if the host
is using a retuning timer for the card inserted.

This flag is set when the host does tuning the first time for the card
and the host's retuning mode is 1. This flag is used afterwards whenever
needs to decide if the host is currently using a retuning timer.

This flag is cleared when the card is removed in sdhci_reinit.

The set/clear of the flag and the start/stop of the retuning timer is
associated with the card's init/remove time, so there is no need to
touch it when the host is to be removed as at that time the card should
have already been removed.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Reviewed-by: Girish K S <girish.shivananjappa@linaro.org>
Reviewed-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Aaron Lu 2012-07-04 13:29:09 +08:00 committed by Chris Ball
parent aa6439dadd
commit 973905feab
2 changed files with 13 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/mmc/host/sdhci.c
View File

@ -250,8 +250,9 @@ static void sdhci_reinit(struct sdhci_host *host)
* applicable to UHS-I cards. So reset these fields to their initial * applicable to UHS-I cards. So reset these fields to their initial
* value when card is removed. * value when card is removed.
*/ */
if (host->version >= SDHCI_SPEC_300 && host->tuning_count && if (host->flags & SDHCI_USING_RETUNING_TIMER) {
host->tuning_mode == SDHCI_TUNING_MODE_1) { host->flags &= ~SDHCI_USING_RETUNING_TIMER;
del_timer_sync(&host->tuning_timer); del_timer_sync(&host->tuning_timer);
host->flags &= ~SDHCI_NEEDS_RETUNING; host->flags &= ~SDHCI_NEEDS_RETUNING;
host->mmc->max_blk_count = host->mmc->max_blk_count =
@ -1873,6 +1874,7 @@ out:
*/ */
if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count && if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
(host->tuning_mode == SDHCI_TUNING_MODE_1)) { (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
host->flags |= SDHCI_USING_RETUNING_TIMER;
mod_timer(&host->tuning_timer, jiffies + mod_timer(&host->tuning_timer, jiffies +
host->tuning_count * HZ); host->tuning_count * HZ);
/* Tuning mode 1 limits the maximum data length to 4MB */ /* Tuning mode 1 limits the maximum data length to 4MB */
@ -1890,10 +1892,10 @@ out:
* try tuning again at a later time, when the re-tuning timer expires. * try tuning again at a later time, when the re-tuning timer expires.
* So for these controllers, we return 0. Since there might be other * So for these controllers, we return 0. Since there might be other
* controllers who do not have this capability, we return error for * controllers who do not have this capability, we return error for
* them. * them. SDHCI_USING_RETUNING_TIMER means the host is currently using
* a retuning timer to do the retuning for the card.
*/ */
if (err && host->tuning_count && if (err && (host->flags & SDHCI_USING_RETUNING_TIMER))
host->tuning_mode == SDHCI_TUNING_MODE_1)
err = 0; err = 0;
sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier); sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
@ -2400,7 +2402,6 @@ out:
int sdhci_suspend_host(struct sdhci_host *host) int sdhci_suspend_host(struct sdhci_host *host)
{ {
int ret; int ret;
bool has_tuning_timer;
if (host->ops->platform_suspend) if (host->ops->platform_suspend)
host->ops->platform_suspend(host); host->ops->platform_suspend(host);
@ -2408,16 +2409,14 @@ int sdhci_suspend_host(struct sdhci_host *host)
sdhci_disable_card_detection(host); sdhci_disable_card_detection(host);
/* Disable tuning since we are suspending */ /* Disable tuning since we are suspending */
has_tuning_timer = host->version >= SDHCI_SPEC_300 && if (host->flags & SDHCI_USING_RETUNING_TIMER) {
host->tuning_count && host->tuning_mode == SDHCI_TUNING_MODE_1;
if (has_tuning_timer) {
del_timer_sync(&host->tuning_timer); del_timer_sync(&host->tuning_timer);
host->flags &= ~SDHCI_NEEDS_RETUNING; host->flags &= ~SDHCI_NEEDS_RETUNING;
} }
ret = mmc_suspend_host(host->mmc); ret = mmc_suspend_host(host->mmc);
if (ret) { if (ret) {
if (has_tuning_timer) { if (host->flags & SDHCI_USING_RETUNING_TIMER) {
host->flags |= SDHCI_NEEDS_RETUNING; host->flags |= SDHCI_NEEDS_RETUNING;
mod_timer(&host->tuning_timer, jiffies + mod_timer(&host->tuning_timer, jiffies +
host->tuning_count * HZ); host->tuning_count * HZ);
@ -2468,8 +2467,7 @@ int sdhci_resume_host(struct sdhci_host *host)
host->ops->platform_resume(host); host->ops->platform_resume(host);
/* Set the re-tuning expiration flag */ /* Set the re-tuning expiration flag */
if ((host->version >= SDHCI_SPEC_300) && host->tuning_count && if (host->flags & SDHCI_USING_RETUNING_TIMER)
(host->tuning_mode == SDHCI_TUNING_MODE_1))
host->flags |= SDHCI_NEEDS_RETUNING; host->flags |= SDHCI_NEEDS_RETUNING;
return ret; return ret;
@ -2508,8 +2506,7 @@ int sdhci_runtime_suspend_host(struct sdhci_host *host)
int ret = 0; int ret = 0;
/* Disable tuning since we are suspending */ /* Disable tuning since we are suspending */
if (host->version >= SDHCI_SPEC_300 && if (host->flags & SDHCI_USING_RETUNING_TIMER) {
host->tuning_mode == SDHCI_TUNING_MODE_1) {
del_timer_sync(&host->tuning_timer); del_timer_sync(&host->tuning_timer);
host->flags &= ~SDHCI_NEEDS_RETUNING; host->flags &= ~SDHCI_NEEDS_RETUNING;
} }
@ -2550,8 +2547,7 @@ int sdhci_runtime_resume_host(struct sdhci_host *host)
sdhci_do_enable_preset_value(host, true); sdhci_do_enable_preset_value(host, true);
/* Set the re-tuning expiration flag */ /* Set the re-tuning expiration flag */
if ((host->version >= SDHCI_SPEC_300) && host->tuning_count && if (host->flags & SDHCI_USING_RETUNING_TIMER)
(host->tuning_mode == SDHCI_TUNING_MODE_1))
host->flags |= SDHCI_NEEDS_RETUNING; host->flags |= SDHCI_NEEDS_RETUNING;
spin_lock_irqsave(&host->lock, flags); spin_lock_irqsave(&host->lock, flags);
@ -3140,8 +3136,6 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
free_irq(host->irq, host); free_irq(host->irq, host);
del_timer_sync(&host->timer); del_timer_sync(&host->timer);
if (host->version >= SDHCI_SPEC_300)
del_timer_sync(&host->tuning_timer);
tasklet_kill(&host->card_tasklet); tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->finish_tasklet); tasklet_kill(&host->finish_tasklet);

1
include/linux/mmc/sdhci.h
View File

@ -122,6 +122,7 @@ struct sdhci_host {
#define SDHCI_PV_ENABLED (1<<8) /* Preset value enabled */ #define SDHCI_PV_ENABLED (1<<8) /* Preset value enabled */
#define SDHCI_SDIO_IRQ_ENABLED (1<<9) /* SDIO irq enabled */ #define SDHCI_SDIO_IRQ_ENABLED (1<<9) /* SDIO irq enabled */
#define SDHCI_HS200_NEEDS_TUNING (1<<10) /* HS200 needs tuning */ #define SDHCI_HS200_NEEDS_TUNING (1<<10) /* HS200 needs tuning */
#define SDHCI_USING_RETUNING_TIMER (1<<11) /* Host is using a retuning timer for the card */
unsigned int version; /* SDHCI spec. version */ unsigned int version; /* SDHCI spec. version */