[PATCH] sunxi: mmc: Improve reset procedure

[Jernej Skrabec <jernej.skrabec@gmail.com>]

Cards should always be reset and threshold set. This fixes eMMC on H616.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/mmc/sunxi_mmc.c | 28 ++++++++++++++++++++++------
 drivers/mmc/sunxi_mmc.h | 15 +++++++++++++--
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
index 0b56d1405bee..335def4b9738 100644
--- a/drivers/mmc/sunxi_mmc.c
+++ b/drivers/mmc/sunxi_mmc.c
@@ -442,6 +442,26 @@ out:
 	return error;
 }
 
+static void sunxi_mmc_reset(struct sunxi_mmc *regs)
+{
+	/* Reset controller */
+	writel(SUNXI_MMC_GCTRL_RESET, &regs->gctrl);
+	udelay(1000);
+
+	if (IS_ENABLED(CONFIG_SUN50I_GEN_H6) || IS_ENABLED(CONFIG_SUNXI_GEN_NCAT2)) {
+		/* Reset card */
+		writel(SUNXI_MMC_HWRST_ASSERT, &regs->hwrst);
+		udelay(10);
+		writel(SUNXI_MMC_HWRST_DEASSERT, &regs->hwrst);
+		udelay(300);
+
+		/* Setup FIFO R/W threshold. Needed on H616. */
+		writel(SUNXI_MMC_THLDC_READ_THLD(512) |
+		       SUNXI_MMC_THLDC_WRITE_EN |
+		       SUNXI_MMC_THLDC_READ_EN, &regs->thldc);
+	}
+}
+
 /* non-DM code here is used by the (ARM) SPL only */
 
 #if !CONFIG_IS_ENABLED(DM_MMC)
@@ -489,9 +509,7 @@ static int sunxi_mmc_core_init(struct mmc *mmc)
 {
 	struct sunxi_mmc_priv *priv = mmc->priv;
 
-	/* Reset controller */
-	writel(SUNXI_MMC_GCTRL_RESET, &priv->reg->gctrl);
-	udelay(1000);
+	sunxi_mmc_reset(priv->reg);
 
 	return 0;
 }
@@ -684,9 +702,7 @@ static int sunxi_mmc_probe(struct udevice *dev)
 
 	upriv->mmc = &plat->mmc;
 
-	/* Reset controller */
-	writel(SUNXI_MMC_GCTRL_RESET, &priv->reg->gctrl);
-	udelay(1000);
+	sunxi_mmc_reset(priv->reg);
 
 	return 0;
 }
diff --git a/drivers/mmc/sunxi_mmc.h b/drivers/mmc/sunxi_mmc.h
index f4ae5a790c87..9d55904c213c 100644
--- a/drivers/mmc/sunxi_mmc.h
+++ b/drivers/mmc/sunxi_mmc.h
@@ -37,7 +37,9 @@ struct sunxi_mmc {
 	u32 res0;		/* 0x54 reserved */
 	u32 a12a;		/* 0x58 Auto command 12 argument */
 	u32 ntsr;		/* 0x5c	New timing set register */
-	u32 res1[8];
+	u32 res1[6];
+	u32 hwrst;		/* 0x78 Hardware Reset */
+	u32 res5;
 	u32 dmac;		/* 0x80 internal DMA control */
 	u32 dlba;		/* 0x84 internal DMA descr list base address */
 	u32 idst;		/* 0x88 internal DMA status */
@@ -46,7 +48,8 @@ struct sunxi_mmc {
 	u32 cbda;		/* 0x94 */
 	u32 res2[26];
 #if defined(CONFIG_SUNXI_GEN_SUN6I) || defined(CONFIG_SUN50I_GEN_H6) || defined(CONFIG_SUNXI_GEN_NCAT2)
-	u32 res3[17];
+	u32 thldc;		/* 0x100 Threshold control */
+	u32 res3[16];
 	u32 samp_dl;
 	u32 res4[46];
 #endif
@@ -123,6 +126,9 @@ struct sunxi_mmc {
 
 #define SUNXI_MMC_NTSR_MODE_SEL_NEW		(0x1 << 31)
 
+#define SUNXI_MMC_HWRST_ASSERT		(0x0 << 0)
+#define SUNXI_MMC_HWRST_DEASSERT	(0x1 << 0)
+
 #define SUNXI_MMC_IDMAC_RESET		(0x1 << 0)
 #define SUNXI_MMC_IDMAC_FIXBURST	(0x1 << 1)
 #define SUNXI_MMC_IDMAC_ENABLE		(0x1 << 7)
@@ -133,6 +139,11 @@ struct sunxi_mmc {
 #define SUNXI_MMC_COMMON_CLK_GATE		(1 << 16)
 #define SUNXI_MMC_COMMON_RESET			(1 << 18)
 
+#define SUNXI_MMC_THLDC_READ_EN		(0x1 << 0)
+#define SUNXI_MMC_THLDC_BSY_CLR_INT_EN	(0x1 << 1)
+#define SUNXI_MMC_THLDC_WRITE_EN	(0x1 << 2)
+#define SUNXI_MMC_THLDC_READ_THLD(x)	(((x) & 0xfff) << 16)
+
 #define SUNXI_MMC_CAL_DL_SW_EN		(0x1 << 7)
 
 #endif /* _SUNXI_MMC_H */
-- 
2.48.1