[RFC PATCH v2 2/5] mmc: renesas_sdhi: Add manual correction

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

From: Takeshi Saito <takeshi.saito.xv@renesas.com>

This patch adds a manual correction mechanism for SDHI. Currently, SDHI
uses automatic TAP position correction. However, TAP position can also
be corrected manually via correction error status flags.

Signed-off-by: Takeshi Saito <takeshi.saito.xv@renesas.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/mmc/host/renesas_sdhi.h      |  1 +
 drivers/mmc/host/renesas_sdhi_core.c | 61 +++++++++++++++++++++++-----
 2 files changed, 52 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/renesas_sdhi.h b/drivers/mmc/host/renesas_sdhi.h
index f524251d5113..11a0b2bca3aa 100644
--- a/drivers/mmc/host/renesas_sdhi.h
+++ b/drivers/mmc/host/renesas_sdhi.h
@@ -57,6 +57,7 @@ struct renesas_sdhi {
 	void __iomem *scc_ctl;
 	u32 scc_tappos;
 	u32 scc_tappos_hs400;
+	bool doing_tune;
 };
 
 #define host_to_priv(host) \
diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
index 519d91ae3373..6cedc0a10593 100644
--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -263,6 +263,8 @@ static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
 #define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN	BIT(0)
 /* Definitions for values the SH_MOBILE_SDHI_SCC_RVSREQ register */
 #define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR	BIT(2)
+#define SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPUP	BIT(1)
+#define SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPDOWN	BIT(0)
 /* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT2 register */
 #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL	BIT(4)
 #define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN	BIT(31)
@@ -321,6 +323,8 @@ static void renesas_sdhi_prepare_tuning(struct tmio_mmc_host *host,
 {
 	struct renesas_sdhi *priv = host_to_priv(host);
 
+	priv->doing_tune = true;
+
 	/* Set sampling clock position */
 	sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap);
 }
@@ -426,6 +430,8 @@ static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
 	unsigned long ntap;     /* temporary counter of tuning success */
 	unsigned long i;
 
+	priv->doing_tune = false;
+
 	/* Clear SCC_RVSREQ */
 	sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
 
@@ -485,6 +491,47 @@ static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
 	return 0;
 }
 
+static bool renesas_sdhi_manual_correction(struct tmio_mmc_host *host, bool use_4tap)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+	u32 val;
+
+	val = sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ);
+	if (!val)
+		return false;
+
+	sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
+
+	/* Change TAP position according to correction status */
+	if (val & SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR)
+		return true;    /* Need re-tune */
+	else if (val & SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPUP)
+		host->tap_set = (host->tap_set + 1) % host->tap_num;
+	else if (val & SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPDOWN)
+		host->tap_set = (host->tap_set - 1) % host->tap_num;
+	else
+		return false;
+
+	sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET,
+		       host->tap_set / (use_4tap ? 2 : 1));
+
+	return false;
+}
+
+static bool renesas_sdhi_auto_correction(struct tmio_mmc_host *host)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+
+	/* Check SCC error */
+	if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) &
+	    SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) {
+		sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
+		return true;
+	}
+
+	return false;
+}
+
 static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host)
 {
 	struct renesas_sdhi *priv = host_to_priv(host);
@@ -499,20 +546,14 @@ static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host)
 	    !(host->mmc->ios.timing == MMC_TIMING_MMC_HS400 && !use_4tap))
 		return false;
 
-	if (mmc_doing_retune(host->mmc))
+	if (mmc_doing_retune(host->mmc) || priv->doing_tune)
 		return false;
 
-	/* Check SCC error */
 	if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) &
-	    SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &&
-	    sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) &
-	    SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) {
-		/* Clear SCC error */
-		sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
-		return true;
-	}
+	    SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN)
+		return renesas_sdhi_auto_correction(host);
 
-	return false;
+	return renesas_sdhi_manual_correction(host, use_4tap);
 }
 
 static void renesas_sdhi_hw_reset(struct tmio_mmc_host *host)
-- 
2.20.1