clk: rmobile: Add support for setting SDxCKCR

The SDxCKCR must be configured correctly, otherwise the SDIF can be
unstable. This is done in board files thus far, but those are going
away, so move the setting of SDxCKCR into the correct place.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/clk/renesas/clk-rcar-gen3.c b/drivers/clk/renesas/clk-rcar-gen3.c
index 4e748569404..3326b61f3ac 100644
--- a/drivers/clk/renesas/clk-rcar-gen3.c
+++ b/drivers/clk/renesas/clk-rcar-gen3.c
@@ -752,6 +752,36 @@ static int gen3_clk_get_parent(struct clk *clk, struct clk *parent)
 	return 0;
 }
 
+static int gen3_clk_setup_sdif_div(struct clk *clk)
+{
+	struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
+	const struct cpg_core_clk *core;
+	struct clk parent;
+	int ret;
+
+	ret = gen3_clk_get_parent(clk, &parent);
+	if (ret) {
+		printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
+		return ret;
+	}
+
+	if (gen3_clk_is_mod(&parent))
+		return 0;
+
+	ret = gen3_clk_get_core(&parent, &core);
+	if (ret)
+		return ret;
+
+	if (core->type != CLK_TYPE_GEN3_SD)
+		return 0;
+
+	debug("%s[%i] SDIF offset=%x\n", __func__, __LINE__, core->offset);
+
+	writel(1, priv->base + core->offset);
+
+	return 0;
+}
+
 static int gen3_clk_endisable(struct clk *clk, bool enable)
 {
 	struct gen3_clk_priv *priv = dev_get_priv(clk->dev);
@@ -759,6 +789,7 @@ static int gen3_clk_endisable(struct clk *clk, bool enable)
 	const unsigned int reg = clkid / 100;
 	const unsigned int bit = clkid % 100;
 	const u32 bitmask = BIT(bit);
+	int ret;
 
 	if (!gen3_clk_is_mod(clk))
 		return -EINVAL;
@@ -767,6 +798,9 @@ static int gen3_clk_endisable(struct clk *clk, bool enable)
 	      clkid, reg, bit, enable ? "ON" : "OFF");
 
 	if (enable) {
+		ret = gen3_clk_setup_sdif_div(clk);
+		if (ret)
+			return ret;
 		clrbits_le32(priv->base + SMSTPCR(reg), bitmask);
 		return wait_for_bit("MSTP", priv->base + MSTPSR(reg),
 				    bitmask, 0, 100, 0);