mirror of https://gitee.com/openkylin/linux.git
mmc: sdhci: add support for retuning mode 1
Host Controller v3.00 can support retuning modes 1,2 or 3 depending on the bits 46-47 of the Capabilities register. Also, the timer count for retuning is indicated by bits 40-43 of the same register. We initialize timer_list for retuning the first time we execute tuning procedure. This condition is indicated by SDHCI_NEEDS_RETUNING not being set. Since retuning mode 1 sets a limit of 4MB on the maximum data length, we set max_blk_count appropriately. Once the tuning timer expires, we set SDHCI_NEEDS_RETUNING flag, and if the flag is set, we execute tuning procedure before sending the next command. We need to restore mmc_request structure after executing retuning procedure since host->mrq is used inside the procedure to send CMD19. We also disable and re-enable this flag during suspend and resume respectively, as per the spec v3.00. Tested by Zhangfei Gao with a Toshiba uhs card and general hs card, on mmp2 in SDMA mode. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Reviewed-by: Philip Rakity <prakity@marvell.com> Tested-by: Philip Rakity <prakity@marvell.com> Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Arindam Nath
Chris Ball
parent
c3ed387762
commit
cf2b5eea1e
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@ -46,6 +46,8 @@ static void sdhci_finish_data(struct sdhci_host *);
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static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
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static void sdhci_finish_command(struct sdhci_host *);
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static int sdhci_execute_tuning(struct mmc_host *mmc);
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static void sdhci_tuning_timer(unsigned long data);
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static void sdhci_dumpregs(struct sdhci_host *host)
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{
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@ -1206,8 +1208,27 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
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if (!present || host->flags & SDHCI_DEVICE_DEAD) {
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host->mrq->cmd->error = -ENOMEDIUM;
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tasklet_schedule(&host->finish_tasklet);
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} else
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} else {
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u32 present_state;
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present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
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/*
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* Check if the re-tuning timer has already expired and there
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* is no on-going data transfer. If so, we need to execute
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* tuning procedure before sending command.
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*/
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if ((host->flags & SDHCI_NEEDS_RETUNING) &&
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!(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
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spin_unlock_irqrestore(&host->lock, flags);
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sdhci_execute_tuning(mmc);
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spin_lock_irqsave(&host->lock, flags);
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/* Restore original mmc_request structure */
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host->mrq = mrq;
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}
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sdhci_send_command(host, mrq->cmd);
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}
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mmiowb();
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spin_unlock_irqrestore(&host->lock, flags);
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@ -1673,6 +1694,37 @@ static int sdhci_execute_tuning(struct mmc_host *mmc)
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}
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out:
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/*
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* If this is the very first time we are here, we start the retuning
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* timer. Since only during the first time, SDHCI_NEEDS_RETUNING
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* flag won't be set, we check this condition before actually starting
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* the timer.
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*/
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if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
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(host->tuning_mode == SDHCI_TUNING_MODE_1)) {
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mod_timer(&host->tuning_timer, jiffies +
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host->tuning_count * HZ);
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/* Tuning mode 1 limits the maximum data length to 4MB */
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mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
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} else {
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host->flags &= ~SDHCI_NEEDS_RETUNING;
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/* Reload the new initial value for timer */
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if (host->tuning_mode == SDHCI_TUNING_MODE_1)
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mod_timer(&host->tuning_timer, jiffies +
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host->tuning_count * HZ);
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}
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/*
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* In case tuning fails, host controllers which support re-tuning can
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* try tuning again at a later time, when the re-tuning timer expires.
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* So for these controllers, we return 0. Since there might be other
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* controllers who do not have this capability, we return error for
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* them.
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*/
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if (err && host->tuning_count &&
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host->tuning_mode == SDHCI_TUNING_MODE_1)
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err = 0;
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sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
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spin_unlock(&host->lock);
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enable_irq(host->irq);
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@ -1775,6 +1827,9 @@ static void sdhci_tasklet_finish(unsigned long param)
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del_timer(&host->timer);
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if (host->version >= SDHCI_SPEC_300)
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del_timer(&host->tuning_timer);
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mrq = host->mrq;
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/*
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@ -1848,6 +1903,20 @@ static void sdhci_timeout_timer(unsigned long data)
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spin_unlock_irqrestore(&host->lock, flags);
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}
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static void sdhci_tuning_timer(unsigned long data)
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{
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struct sdhci_host *host;
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unsigned long flags;
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host = (struct sdhci_host *)data;
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spin_lock_irqsave(&host->lock, flags);
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host->flags |= SDHCI_NEEDS_RETUNING;
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spin_unlock_irqrestore(&host->lock, flags);
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}
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/*****************************************************************************\
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* *
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* Interrupt handling *
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@ -2122,6 +2191,14 @@ int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
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sdhci_disable_card_detection(host);
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/* Disable tuning since we are suspending */
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if (host->version >= SDHCI_SPEC_300 && host->tuning_count &&
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host->tuning_mode == SDHCI_TUNING_MODE_1) {
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host->flags &= ~SDHCI_NEEDS_RETUNING;
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mod_timer(&host->tuning_timer, jiffies +
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host->tuning_count * HZ);
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}
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ret = mmc_suspend_host(host->mmc);
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if (ret)
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return ret;
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@ -2163,6 +2240,11 @@ int sdhci_resume_host(struct sdhci_host *host)
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ret = mmc_resume_host(host->mmc);
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sdhci_enable_card_detection(host);
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/* Set the re-tuning expiration flag */
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if ((host->version >= SDHCI_SPEC_300) && host->tuning_count &&
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(host->tuning_mode == SDHCI_TUNING_MODE_1))
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host->flags |= SDHCI_NEEDS_RETUNING;
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return ret;
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}
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@ -2414,6 +2496,21 @@ int sdhci_add_host(struct sdhci_host *host)
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if (caps[1] & SDHCI_DRIVER_TYPE_D)
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mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
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/* Initial value for re-tuning timer count */
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host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
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SDHCI_RETUNING_TIMER_COUNT_SHIFT;
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/*
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* In case Re-tuning Timer is not disabled, the actual value of
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* re-tuning timer will be 2 ^ (n - 1).
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*/
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if (host->tuning_count)
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host->tuning_count = 1 << (host->tuning_count - 1);
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/* Re-tuning mode supported by the Host Controller */
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host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
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SDHCI_RETUNING_MODE_SHIFT;
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ocr_avail = 0;
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/*
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* According to SD Host Controller spec v3.00, if the Host System
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@ -2559,9 +2656,15 @@ int sdhci_add_host(struct sdhci_host *host)
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setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
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if (host->version >= SDHCI_SPEC_300)
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if (host->version >= SDHCI_SPEC_300) {
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init_waitqueue_head(&host->buf_ready_int);
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/* Initialize re-tuning timer */
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init_timer(&host->tuning_timer);
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host->tuning_timer.data = (unsigned long)host;
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host->tuning_timer.function = sdhci_tuning_timer;
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}
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ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
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mmc_hostname(mmc), host);
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if (ret)
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@ -2655,6 +2758,8 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
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free_irq(host->irq, host);
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del_timer_sync(&host->timer);
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if (host->version >= SDHCI_SPEC_300)
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del_timer_sync(&host->tuning_timer);
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tasklet_kill(&host->card_tasklet);
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tasklet_kill(&host->finish_tasklet);
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@ -191,7 +191,11 @@
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#define SDHCI_DRIVER_TYPE_A 0x00000010
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#define SDHCI_DRIVER_TYPE_C 0x00000020
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#define SDHCI_DRIVER_TYPE_D 0x00000040
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#define SDHCI_USE_SDR50_TUNING 0x00002000
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#define SDHCI_RETUNING_TIMER_COUNT_MASK 0x00000F00
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#define SDHCI_RETUNING_TIMER_COUNT_SHIFT 8
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#define SDHCI_USE_SDR50_TUNING 0x00002000
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#define SDHCI_RETUNING_MODE_MASK 0x0000C000
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#define SDHCI_RETUNING_MODE_SHIFT 14
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#define SDHCI_CLOCK_MUL_MASK 0x00FF0000
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#define SDHCI_CLOCK_MUL_SHIFT 16
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@ -112,6 +112,7 @@ struct sdhci_host {
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#define SDHCI_REQ_USE_DMA (1<<2) /* Use DMA for this req. */
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#define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */
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#define SDHCI_SDR50_NEEDS_TUNING (1<<4) /* SDR50 needs tuning */
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#define SDHCI_NEEDS_RETUNING (1<<5) /* Host needs retuning */
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unsigned int version; /* SDHCI spec. version */
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@ -152,6 +153,11 @@ struct sdhci_host {
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wait_queue_head_t buf_ready_int; /* Waitqueue for Buffer Read Ready interrupt */
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unsigned int tuning_done; /* Condition flag set when CMD19 succeeds */
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unsigned int tuning_count; /* Timer count for re-tuning */
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unsigned int tuning_mode; /* Re-tuning mode supported by host */
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#define SDHCI_TUNING_MODE_1 0
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struct timer_list tuning_timer; /* Timer for tuning */
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unsigned long private[0] ____cacheline_aligned;
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};
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#endif /* __SDHCI_H */
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