mmc: tmio: Keep host active while serving requests

Use runtime PM to keep the host active during I/O operations and other
requests which requires the tmio hardware to be powered.

Additionally make use of the runtime PM autosuspend feature with a
default timeout of 50 ms.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>

1 files changed, 32 insertions, 23 deletions

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 5c2e5a36258a..d63d292933b4 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -144,7 +144,8 @@ static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
                 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
 
                 host->sdio_irq_enabled = false;
-                pm_runtime_put(mmc_dev(mmc));
+                pm_runtime_mark_last_busy(mmc_dev(mmc));
+                pm_runtime_put_autosuspend(mmc_dev(mmc));
         }
 }
 
@@ -252,6 +253,9 @@ static void tmio_mmc_reset_work(struct work_struct *work)
 
         tmio_mmc_abort_dma(host);
         mmc_request_done(host->mmc, mrq);
+
+        pm_runtime_mark_last_busy(mmc_dev(host->mmc));
+        pm_runtime_put_autosuspend(mmc_dev(host->mmc));
 }
 
 /* called with host->lock held, interrupts disabled */
@@ -281,6 +285,9 @@ static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
                 tmio_mmc_abort_dma(host);
 
         mmc_request_done(host->mmc, mrq);
+
+        pm_runtime_mark_last_busy(mmc_dev(host->mmc));
+        pm_runtime_put_autosuspend(mmc_dev(host->mmc));
 }
 
 static void tmio_mmc_done_work(struct work_struct *work)
@@ -735,6 +742,8 @@ static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 
         spin_unlock_irqrestore(&host->lock, flags);
 
+        pm_runtime_get_sync(mmc_dev(mmc));
+
         if (mrq->data) {
                 ret = tmio_mmc_start_data(host, mrq->data);
                 if (ret)
@@ -753,6 +762,9 @@ fail:
         host->mrq = NULL;
         mrq->cmd->error = ret;
         mmc_request_done(mmc, mrq);
+
+        pm_runtime_mark_last_busy(mmc_dev(mmc));
+        pm_runtime_put_autosuspend(mmc_dev(mmc));
 }
 
 static int tmio_mmc_clk_update(struct mmc_host *mmc)
@@ -831,6 +843,8 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         struct device *dev = &host->pdev->dev;
         unsigned long flags;
 
+        pm_runtime_get_sync(mmc_dev(mmc));
+
         mutex_lock(&host->ios_lock);
 
         spin_lock_irqsave(&host->lock, flags);
@@ -866,7 +880,6 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         if (ios->power_mode == MMC_POWER_ON && ios->clock) {
                 if (host->power != TMIO_MMC_ON_RUN) {
                         tmio_mmc_clk_update(mmc);
-                        pm_runtime_get_sync(dev);
                         if (host->resuming) {
                                 tmio_mmc_reset(host);
                                 host->resuming = false;
@@ -896,7 +909,6 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
                 if (old_power == TMIO_MMC_ON_RUN) {
                         tmio_mmc_clk_stop(host);
-                        pm_runtime_put(dev);
                         if (pdata->clk_disable)
                                 pdata->clk_disable(host->pdev);
                 }
@@ -923,6 +935,9 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         host->mrq = NULL;
 
         mutex_unlock(&host->ios_lock);
+
+        pm_runtime_mark_last_busy(mmc_dev(mmc));
+        pm_runtime_put_autosuspend(mmc_dev(mmc));
 }
 
 static int tmio_mmc_get_ro(struct mmc_host *mmc)
@@ -933,8 +948,13 @@ static int tmio_mmc_get_ro(struct mmc_host *mmc)
         if (ret >= 0)
                 return ret;
 
-        return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
-                 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
+        pm_runtime_get_sync(mmc_dev(mmc));
+        ret = !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
+                (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
+        pm_runtime_mark_last_busy(mmc_dev(mmc));
+        pm_runtime_put_autosuspend(mmc_dev(mmc));
+
+        return ret;
 }
 
 static const struct mmc_host_ops tmio_mmc_ops = {
@@ -1040,27 +1060,14 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
                                   mmc->slot.cd_irq >= 0);
 
         _host->power = TMIO_MMC_OFF_STOP;
-        pm_runtime_enable(&pdev->dev);
-        ret = pm_runtime_resume(&pdev->dev);
-        if (ret < 0)
-                goto pm_disable;
-
         if (tmio_mmc_clk_update(mmc) < 0) {
                 mmc->f_max = pdata->hclk;
                 mmc->f_min = mmc->f_max / 512;
         }
 
         /*
-         * There are 4 different scenarios for the card detection:
-         *  1) an external gpio irq handles the cd (best for power savings)
-         *  2) internal sdhi irq handles the cd
-         *  3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
-         *  4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
-         *
-         *  While we increment the runtime PM counter for all scenarios when
-         *  the mmc core activates us by calling an appropriate set_ios(), we
-         *  must additionally ensure that in case 2) the tmio mmc hardware stays
-         *  powered on during runtime for the card detection to work.
+         * While using internal tmio hardware logic for card detection, we need
+         * to ensure it stays powered for it to work.
          */
         if (_host->native_hotplug)
                 pm_runtime_get_noresume(&pdev->dev);
@@ -1098,6 +1105,11 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
         /* See if we also get DMA */
         tmio_mmc_request_dma(_host, pdata);
 
+        pm_runtime_set_active(&pdev->dev);
+        pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
+        pm_runtime_use_autosuspend(&pdev->dev);
+        pm_runtime_enable(&pdev->dev);
+
         ret = mmc_add_host(mmc);
         if (pdata->clk_disable)
                 pdata->clk_disable(pdev);
@@ -1120,9 +1132,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
 
         return 0;
 
-pm_disable:
-        pm_runtime_disable(&pdev->dev);
-        iounmap(_host->ctl);
 host_free:
         mmc_free_host(mmc);