mmc: sdhci: Change to new way of doing re-tuning

Make use of mmc core support for re-tuning instead
of doing it all in the sdhci driver.

This patch also changes to flag the need for re-tuning
always after runtime suspend when tuning has been used
at initialization. Previously it was only done if
the re-tuning timer was in use.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c80287a..b345844 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -52,7 +52,6 @@ static void sdhci_finish_data(struct sdhci_host *);
 
 static void sdhci_finish_command(struct sdhci_host *);
 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
-static void sdhci_tuning_timer(unsigned long data);
 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
                                        struct mmc_data *data,
@@ -254,17 +253,6 @@ static void sdhci_init(struct sdhci_host *host, int soft)
 static void sdhci_reinit(struct sdhci_host *host)
 {
        sdhci_init(host, 0);
-       /*
-        * Retuning stuffs are affected by different cards inserted and only
-        * applicable to UHS-I cards. So reset these fields to their initial
-        * value when card is removed.
-        */
-       if (host->flags & SDHCI_USING_RETUNING_TIMER) {
-               host->flags &= ~SDHCI_USING_RETUNING_TIMER;
-
-               del_timer_sync(&host->tuning_timer);
-               host->flags &= ~SDHCI_NEEDS_RETUNING;
-       }
        sdhci_enable_card_detection(host);
 }
 
@@ -1353,7 +1341,6 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
        struct sdhci_host *host;
        int present;
        unsigned long flags;
-       u32 tuning_opcode;
 
        host = mmc_priv(mmc);
 
@@ -1387,39 +1374,6 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
                host->mrq->cmd->error = -ENOMEDIUM;
                tasklet_schedule(&host->finish_tasklet);
        } else {
-               u32 present_state;
-
-               present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
-               /*
-                * Check if the re-tuning timer has already expired and there
-                * is no on-going data transfer and DAT0 is not busy. If so,
-                * we need to execute tuning procedure before sending command.
-                */
-               if ((host->flags & SDHCI_NEEDS_RETUNING) &&
-                   !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) &&
-                   (present_state & SDHCI_DATA_0_LVL_MASK)) {
-                       if (mmc->card) {
-                               /* eMMC uses cmd21 but sd and sdio use cmd19 */
-                               tuning_opcode =
-                                       mmc->card->type == MMC_TYPE_MMC ?
-                                       MMC_SEND_TUNING_BLOCK_HS200 :
-                                       MMC_SEND_TUNING_BLOCK;
-
-                               /* Here we need to set the host->mrq to NULL,
-                                * in case the pending finish_tasklet
-                                * finishes it incorrectly.
-                                */
-                               host->mrq = NULL;
-
-                               spin_unlock_irqrestore(&host->lock, flags);
-                               sdhci_execute_tuning(mmc, tuning_opcode);
-                               spin_lock_irqsave(&host->lock, flags);
-
-                               /* Restore original mmc_request structure */
-                               host->mrq = mrq;
-                       }
-               }
-
                if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
                        sdhci_send_command(host, mrq->sbc);
                else
@@ -2065,23 +2019,18 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
        }
 
 out:
-       host->flags &= ~SDHCI_NEEDS_RETUNING;
-
        if (tuning_count) {
-               host->flags |= SDHCI_USING_RETUNING_TIMER;
-               mod_timer(&host->tuning_timer, jiffies + tuning_count * HZ);
+               /*
+                * In case tuning fails, host controllers which support
+                * re-tuning can 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 controllers who do not
+                * have this capability, we return error for them.
+                */
+               err = 0;
        }
 
-       /*
-        * In case tuning fails, host controllers which support re-tuning can
-        * 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
-        * controllers who do not have this capability, we return error for
-        * them. SDHCI_USING_RETUNING_TIMER means the host is currently using
-        * a retuning timer to do the retuning for the card.
-        */
-       if (err && (host->flags & SDHCI_USING_RETUNING_TIMER))
-               err = 0;
+       host->mmc->retune_period = err ? 0 : tuning_count;
 
        sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
        sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
@@ -2337,20 +2286,6 @@ static void sdhci_timeout_timer(unsigned long data)
        spin_unlock_irqrestore(&host->lock, flags);
 }
 
-static void sdhci_tuning_timer(unsigned long data)
-{
-       struct sdhci_host *host;
-       unsigned long flags;
-
-       host = (struct sdhci_host *)data;
-
-       spin_lock_irqsave(&host->lock, flags);
-
-       host->flags |= SDHCI_NEEDS_RETUNING;
-
-       spin_unlock_irqrestore(&host->lock, flags);
-}
-
 /*****************************************************************************\
  *                                                                           *
  * Interrupt handling                                                        *
@@ -2728,11 +2663,8 @@ int sdhci_suspend_host(struct sdhci_host *host)
 {
        sdhci_disable_card_detection(host);
 
-       /* Disable tuning since we are suspending */
-       if (host->flags & SDHCI_USING_RETUNING_TIMER) {
-               del_timer_sync(&host->tuning_timer);
-               host->flags &= ~SDHCI_NEEDS_RETUNING;
-       }
+       mmc_retune_timer_stop(host->mmc);
+       mmc_retune_needed(host->mmc);
 
        if (!device_may_wakeup(mmc_dev(host->mmc))) {
                host->ier = 0;
@@ -2782,10 +2714,6 @@ int sdhci_resume_host(struct sdhci_host *host)
 
        sdhci_enable_card_detection(host);
 
-       /* Set the re-tuning expiration flag */
-       if (host->flags & SDHCI_USING_RETUNING_TIMER)
-               host->flags |= SDHCI_NEEDS_RETUNING;
-
        return ret;
 }
 
@@ -2822,11 +2750,8 @@ int sdhci_runtime_suspend_host(struct sdhci_host *host)
 {
        unsigned long flags;
 
-       /* Disable tuning since we are suspending */
-       if (host->flags & SDHCI_USING_RETUNING_TIMER) {
-               del_timer_sync(&host->tuning_timer);
-               host->flags &= ~SDHCI_NEEDS_RETUNING;
-       }
+       mmc_retune_timer_stop(host->mmc);
+       mmc_retune_needed(host->mmc);
 
        spin_lock_irqsave(&host->lock, flags);
        host->ier &= SDHCI_INT_CARD_INT;
@@ -2869,10 +2794,6 @@ int sdhci_runtime_resume_host(struct sdhci_host *host)
                spin_unlock_irqrestore(&host->lock, flags);
        }
 
-       /* Set the re-tuning expiration flag */
-       if (host->flags & SDHCI_USING_RETUNING_TIMER)
-               host->flags |= SDHCI_NEEDS_RETUNING;
-
        spin_lock_irqsave(&host->lock, flags);
 
        host->runtime_suspended = false;
@@ -3408,13 +3329,6 @@ int sdhci_add_host(struct sdhci_host *host)
 
        init_waitqueue_head(&host->buf_ready_int);
 
-       if (host->version >= SDHCI_SPEC_300) {
-               /* Initialize re-tuning timer */
-               init_timer(&host->tuning_timer);
-               host->tuning_timer.data = (unsigned long)host;
-               host->tuning_timer.function = sdhci_tuning_timer;
-       }
-
        sdhci_init(host, 0);
 
        ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index e639b7f..923ff22 100644 (file)
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -432,13 +432,11 @@ struct sdhci_host {
 #define SDHCI_REQ_USE_DMA      (1<<2)  /* Use DMA for this req. */
 #define SDHCI_DEVICE_DEAD      (1<<3)  /* Device unresponsive */
 #define SDHCI_SDR50_NEEDS_TUNING (1<<4)        /* SDR50 needs tuning */
-#define SDHCI_NEEDS_RETUNING   (1<<5)  /* Host needs retuning */
 #define SDHCI_AUTO_CMD12       (1<<6)  /* Auto CMD12 support */
 #define SDHCI_AUTO_CMD23       (1<<7)  /* Auto CMD23 support */
 #define SDHCI_PV_ENABLED       (1<<8)  /* Preset value enabled */
 #define SDHCI_SDIO_IRQ_ENABLED (1<<9)  /* SDIO irq enabled */
 #define SDHCI_SDR104_NEEDS_TUNING (1<<10)      /* SDR104/HS200 needs tuning */
-#define SDHCI_USING_RETUNING_TIMER (1<<11)     /* Host is using a retuning timer for the card */
 #define SDHCI_USE_64_BIT_DMA   (1<<12) /* Use 64-bit DMA */
 #define SDHCI_HS400_TUNING     (1<<13) /* Tuning for HS400 */
 
@@ -504,7 +502,6 @@ struct sdhci_host {
        unsigned int            tuning_count;   /* Timer count for re-tuning */
        unsigned int            tuning_mode;    /* Re-tuning mode supported by host */
 #define SDHCI_TUNING_MODE_1    0
-       struct timer_list       tuning_timer;   /* Timer for tuning */
 
        struct sdhci_host_next  next_data;
        unsigned long private[0] ____cacheline_aligned;