clk: meson: meson8b: Initialize the HDMI PLL registers

Add the reg_sequence to initialize the HDMI PLL with the settings for
a video mode that doesn't require PLL internal clock doubling. These
settings are taken from the 3.10 vendor kernel's driver for the 2970MHz
PLL setting used for the 1080P video mode. This puts the PLL into a
defined state and the Linux kernel can take over.
While not all bits for this PLL are implemented using these "defaults"
and then applying M, N and FRAC seems to work fine.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20210713232510.3057750-5-martin.blumenstingl@googlemail.com

1 files changed, 36 insertions, 4 deletions

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 8f29d26ed726..21bc29455f0d 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -118,6 +118,35 @@ static struct clk_regmap meson8b_fixed_pll = {
 	},
 };
 
+static struct clk_fixed_factor hdmi_pll_dco_in = {
+	.mult = 2,
+	.div = 1,
+	.hw.init = &(struct clk_init_data){
+		.name = "hdmi_pll_dco_in",
+		.ops = &clk_fixed_factor_ops,
+		.parent_data = &(const struct clk_parent_data) {
+			.fw_name = "xtal",
+			.index = -1,
+		},
+		.num_parents = 1,
+	},
+};
+
+/*
+ * Taken from the vendor driver for the 2970/2975MHz (both only differ in the
+ * FRAC part in HHI_VID_PLL_CNTL2) where these values are identical for Meson8,
+ * Meson8b and Meson8m2. This doubles the input (or output - it's not clear
+ * which one but the result is the same) clock. The vendor driver additionally
+ * has the following comment about: "optimise HPLL VCO 2.97GHz performance".
+ */
+static const struct reg_sequence meson8b_hdmi_pll_init_regs[] = {
+	{ .reg = HHI_VID_PLL_CNTL2,	.def = 0x69c84000 },
+	{ .reg = HHI_VID_PLL_CNTL3,	.def = 0x8a46c023 },
+	{ .reg = HHI_VID_PLL_CNTL4,	.def = 0x4123b100 },
+	{ .reg = HHI_VID_PLL_CNTL5,	.def = 0x00012385 },
+	{ .reg = HHI_VID2_PLL_CNTL2,	.def = 0x0430a800 },
+};
+
 static const struct pll_params_table hdmi_pll_params_table[] = {
 	PLL_PARAMS(40, 1),
 	PLL_PARAMS(42, 1),
@@ -172,15 +201,15 @@ static struct clk_regmap meson8b_hdmi_pll_dco = {
 			.width   = 1,
 		},
 		.table = hdmi_pll_params_table,
+		.init_regs = meson8b_hdmi_pll_init_regs,
+		.init_count = ARRAY_SIZE(meson8b_hdmi_pll_init_regs),
 	},
 	.hw.init = &(struct clk_init_data){
 		/* sometimes also called "HPLL" or "HPLL PLL" */
 		.name = "hdmi_pll_dco",
 		.ops = &meson_clk_pll_ro_ops,
-		.parent_data = &(const struct clk_parent_data) {
-			.fw_name = "xtal",
-			.name = "xtal",
-			.index = -1,
+		.parent_hws = (const struct clk_hw *[]) {
+			&hdmi_pll_dco_in.hw
 		},
 		.num_parents = 1,
 	},
@@ -2945,6 +2974,7 @@ static struct clk_hw_onecell_data meson8_hw_onecell_data = {
 		[CLKID_CTS_MCLK_I958]	    = &meson8b_cts_mclk_i958.hw,
 		[CLKID_CTS_I958]	    = &meson8b_cts_i958.hw,
 		[CLKID_VID_PLL_LVDS_EN]	    = &meson8b_vid_pll_lvds_en.hw,
+		[CLKID_HDMI_PLL_DCO_IN]	    = &hdmi_pll_dco_in.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -3163,6 +3193,7 @@ static struct clk_hw_onecell_data meson8b_hw_onecell_data = {
 		[CLKID_CTS_MCLK_I958]	    = &meson8b_cts_mclk_i958.hw,
 		[CLKID_CTS_I958]	    = &meson8b_cts_i958.hw,
 		[CLKID_VID_PLL_LVDS_EN]	    = &meson8b_vid_pll_lvds_en.hw,
+		[CLKID_HDMI_PLL_DCO_IN]	    = &hdmi_pll_dco_in.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -3383,6 +3414,7 @@ static struct clk_hw_onecell_data meson8m2_hw_onecell_data = {
 		[CLKID_CTS_MCLK_I958]	    = &meson8b_cts_mclk_i958.hw,
 		[CLKID_CTS_I958]	    = &meson8b_cts_i958.hw,
 		[CLKID_VID_PLL_LVDS_EN]	    = &meson8b_vid_pll_lvds_en.hw,
+		[CLKID_HDMI_PLL_DCO_IN]	    = &hdmi_pll_dco_in.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,