[v5,3/5] mmc: sdhci-of-esdhc: add tuning support
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Message ID 1492676084-28218-4-git-send-email-yangbo.lu@nxp.com
State Accepted, archived
Headers show

Commit Message

Y.b. Lu April 20, 2017, 8:14 a.m. UTC
eSDHC uses tuning block for tuning procedure. So the tuning
block control register must be configured properly before tuning.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
Changes for v2:
	- Replaced old function for mmc_host_ops.execute_tuning with
	  esdhc_execute_tuning to support eSDHC tuning.
Changes for v3:
	- Put .execute_tuning assigning after after IS_ERR(host) check.
Changes for v4:
	- None
Changes for v5:
	- Added Adrian's ACK
---
 drivers/mmc/host/sdhci-esdhc.h    |  5 +++++
 drivers/mmc/host/sdhci-of-esdhc.c | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+)

Patch
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diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
index 6869567..c4bbd74 100644
--- a/drivers/mmc/host/sdhci-esdhc.h
+++ b/drivers/mmc/host/sdhci-esdhc.h
@@ -53,9 +53,14 @@ 
 #define ESDHC_CLOCK_HCKEN		0x00000002
 #define ESDHC_CLOCK_IPGEN		0x00000001
 
+/* Tuning Block Control Register */
+#define ESDHC_TBCTL			0x120
+#define ESDHC_TB_EN			0x00000004
+
 /* Control Register for DMA transfer */
 #define ESDHC_DMA_SYSCTL		0x40c
 #define ESDHC_PERIPHERAL_CLK_SEL	0x00080000
+#define ESDHC_FLUSH_ASYNC_FIFO		0x00040000
 #define ESDHC_DMA_SNOOP			0x00000040
 
 #endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index f2d7002..607e512 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -631,6 +631,25 @@  static int esdhc_signal_voltage_switch(struct mmc_host *mmc,
 	}
 }
 
+static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u32 val;
+
+	/* Use tuning block for tuning procedure */
+	esdhc_clock_enable(host, false);
+	val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
+	val |= ESDHC_FLUSH_ASYNC_FIFO;
+	sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
+
+	val = sdhci_readl(host, ESDHC_TBCTL);
+	val |= ESDHC_TB_EN;
+	sdhci_writel(host, val, ESDHC_TBCTL);
+	esdhc_clock_enable(host, true);
+
+	return sdhci_execute_tuning(mmc, opcode);
+}
+
 #ifdef CONFIG_PM_SLEEP
 static u32 esdhc_proctl;
 static int esdhc_of_suspend(struct device *dev)
@@ -790,6 +809,7 @@  static int sdhci_esdhc_probe(struct platform_device *pdev)
 
 	host->mmc_host_ops.start_signal_voltage_switch =
 		esdhc_signal_voltage_switch;
+	host->mmc_host_ops.execute_tuning = esdhc_execute_tuning;
 
 	esdhc_init(pdev, host);