From 4b20eef382b6d63ab06dc759eb042f251821d1ec Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Fri, 15 Sep 2017 21:10:08 +0200 Subject: [PATCH] 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 Cc: Nobuhiro Iwamatsu Signed-off-by: Nobuhiro Iwamatsu --- drivers/clk/renesas/clk-rcar-gen3.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/clk/renesas/clk-rcar-gen3.c b/drivers/clk/renesas/clk-rcar-gen3.c index 4e74856..3326b61 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); -- 2.7.4