linux-kernel - [RFC PATCH 1/2] mmc: dw_mmc: add runtime PM callback

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Message-Id: <1474604265-29837-2-git-send-email-shawn.lin@rock-chips.com>
Date:   Fri, 23 Sep 2016 12:17:44 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        linux-rockchip@...ts.infradead.org,
        Shawn Lin <shawn.lin@...k-chips.com>
Subject: [RFC PATCH 1/2] mmc: dw_mmc: add runtime PM callback

This patch add dw_mci_runtime_suspend/resume interfaces
and expose it to dw_mci variant driver to support runtime
PM.

Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>

---

 drivers/mmc/host/dw_mmc.c | 60 +++++++++++++++++++++++++++++++++++++++++++++--
 drivers/mmc/host/dw_mmc.h |  4 +++-
 2 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 4fcbc40..54b860e 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -3266,7 +3266,7 @@ EXPORT_SYMBOL(dw_mci_remove);
 
 
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM
 /*
  * TODO: we should probably disable the clock to the card in the suspend path.
  */
@@ -3324,7 +3324,63 @@ int dw_mci_resume(struct dw_mci *host)
 	return 0;
 }
 EXPORT_SYMBOL(dw_mci_resume);
-#endif /* CONFIG_PM_SLEEP */
+
+int dw_mci_runtime_suspend(struct dw_mci *host)
+{
+	pr_info("dw_mci_runtime_suspend\n");
+
+	if (host->use_dma && host->dma_ops->exit)
+		host->dma_ops->exit(host);
+
+	clk_disable_unprepare(host->ciu_clk);
+
+	return 0;
+}
+EXPORT_SYMBOL(dw_mci_runtime_suspend);
+
+int dw_mci_runtime_resume(struct dw_mci *host)
+{
+	int ret = 0;
+	int i;
+
+	pr_info("dw_mci_runtime_resume\n");
+
+	ret = clk_prepare_enable(host->ciu_clk);
+	if (ret)
+		return ret;
+
+	if (host->use_dma && host->dma_ops->init)
+		host->dma_ops->init(host);
+
+	mci_writel(host, FIFOTH, host->fifoth_val);
+	host->prev_blksz = 0;
+
+	mci_writel(host, TMOUT, 0xFFFFFFFF);
+	mci_writel(host, RINTSTS, 0xFFFFFFFF);
+	mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE |
+				  SDMMC_INT_DATA_OVER |
+				  SDMMC_INT_TXDR | SDMMC_INT_RXDR |
+				  DW_MCI_ERROR_FLAGS);
+	mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
+
+	for (i = 0; i < host->num_slots; i++) {
+		struct dw_mci_slot *slot = host->slot[i];
+
+		if (!slot)
+			continue;
+
+		if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
+			dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
+			dw_mci_setup_bus(slot, true);
+		}
+	}
+
+	dw_mci_enable_cd(host);
+
+	return ret;
+}
+EXPORT_SYMBOL(dw_mci_runtime_resume);
+#endif /* CONFIG_PM */
 
 static int __init dw_mci_init(void)
 {
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index e8cd2de..baa7261 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -234,9 +234,11 @@
 
 extern int dw_mci_probe(struct dw_mci *host);
 extern void dw_mci_remove(struct dw_mci *host);
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM
 extern int dw_mci_suspend(struct dw_mci *host);
 extern int dw_mci_resume(struct dw_mci *host);
+extern int dw_mci_runtime_suspend(struct dw_mci *host);
+extern int dw_mci_runtime_resume(struct dw_mci *host);
 #endif
 
 /**
-- 
2.3.7