drm/sun4i: hdmi: Add support for A31's HDMI controller

The HDMI controller found in the A31 SoCs is slightly different
from the one already supported, which is found in the A10s:

  - Need different initial values for the PLL related registers

  - Different behavior of the DDC and TMDS clocks

  - Different register layout for the DDC portion

  - Separate DDC parent clock

This patch adds support for it.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171010032008.682-10-wens@csie.org

drivers/gpu/drm/sun4i/sun4i_hdmi.h

@@ -59,10 +59,13 @@
 #define SUN4I_HDMI_PAD_CTRL0_TXEN		BIT(23)
 
 #define SUN4I_HDMI_PAD_CTRL1_REG	0x204
+#define SUN4I_HDMI_PAD_CTRL1_UNKNOWN		BIT(24)	/* set on A31 */
 #define SUN4I_HDMI_PAD_CTRL1_AMP_OPT		BIT(23)
 #define SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT		BIT(22)
 #define SUN4I_HDMI_PAD_CTRL1_EMP_OPT		BIT(20)
 #define SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT		BIT(19)
+#define SUN4I_HDMI_PAD_CTRL1_PWSCK		BIT(18)
+#define SUN4I_HDMI_PAD_CTRL1_PWSDT		BIT(17)
 #define SUN4I_HDMI_PAD_CTRL1_REG_DEN		BIT(15)
 #define SUN4I_HDMI_PAD_CTRL1_REG_DENCK		BIT(14)
 #define SUN4I_HDMI_PAD_CTRL1_REG_EMP(n)		(((n) & 7) << 10)

drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c

@@ -324,6 +324,63 @@ static const struct sun4i_hdmi_variant sun5i_variant = {
 	.ddc_fifo_has_dir	= true,
 };
 
+static const struct sun4i_hdmi_variant sun6i_variant = {
+	.has_ddc_parent_clk	= true,
+	.has_reset_control	= true,
+	.pad_ctrl0_init_val	= 0xff |
+				  SUN4I_HDMI_PAD_CTRL0_TXEN |
+				  SUN4I_HDMI_PAD_CTRL0_CKEN |
+				  SUN4I_HDMI_PAD_CTRL0_PWENG |
+				  SUN4I_HDMI_PAD_CTRL0_PWEND |
+				  SUN4I_HDMI_PAD_CTRL0_PWENC |
+				  SUN4I_HDMI_PAD_CTRL0_LDODEN |
+				  SUN4I_HDMI_PAD_CTRL0_LDOCEN,
+	.pad_ctrl1_init_val	= SUN4I_HDMI_PAD_CTRL1_REG_AMP(6) |
+				  SUN4I_HDMI_PAD_CTRL1_REG_EMP(4) |
+				  SUN4I_HDMI_PAD_CTRL1_REG_DENCK |
+				  SUN4I_HDMI_PAD_CTRL1_REG_DEN |
+				  SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT |
+				  SUN4I_HDMI_PAD_CTRL1_EMP_OPT |
+				  SUN4I_HDMI_PAD_CTRL1_PWSDT |
+				  SUN4I_HDMI_PAD_CTRL1_PWSCK |
+				  SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT |
+				  SUN4I_HDMI_PAD_CTRL1_AMP_OPT |
+				  SUN4I_HDMI_PAD_CTRL1_UNKNOWN,
+	.pll_ctrl_init_val	= SUN4I_HDMI_PLL_CTRL_VCO_S(8) |
+				  SUN4I_HDMI_PLL_CTRL_CS(3) |
+				  SUN4I_HDMI_PLL_CTRL_CP_S(10) |
+				  SUN4I_HDMI_PLL_CTRL_S(4) |
+				  SUN4I_HDMI_PLL_CTRL_VCO_GAIN(4) |
+				  SUN4I_HDMI_PLL_CTRL_SDIV2 |
+				  SUN4I_HDMI_PLL_CTRL_LDO2_EN |
+				  SUN4I_HDMI_PLL_CTRL_LDO1_EN |
+				  SUN4I_HDMI_PLL_CTRL_HV_IS_33 |
+				  SUN4I_HDMI_PLL_CTRL_PLL_EN,
+
+	.ddc_clk_reg		= REG_FIELD(SUN6I_HDMI_DDC_CLK_REG, 0, 6),
+	.ddc_clk_pre_divider	= 1,
+	.ddc_clk_m_offset	= 2,
+
+	.tmds_clk_div_offset	= 1,
+
+	.field_ddc_en		= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 0, 0),
+	.field_ddc_start	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 27, 27),
+	.field_ddc_reset	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 31, 31),
+	.field_ddc_addr_reg	= REG_FIELD(SUN6I_HDMI_DDC_ADDR_REG, 1, 31),
+	.field_ddc_slave_addr	= REG_FIELD(SUN6I_HDMI_DDC_ADDR_REG, 1, 7),
+	.field_ddc_int_status	= REG_FIELD(SUN6I_HDMI_DDC_INT_STATUS_REG, 0, 8),
+	.field_ddc_fifo_clear	= REG_FIELD(SUN6I_HDMI_DDC_FIFO_CTRL_REG, 18, 18),
+	.field_ddc_fifo_rx_thres = REG_FIELD(SUN6I_HDMI_DDC_FIFO_CTRL_REG, 4, 7),
+	.field_ddc_fifo_tx_thres = REG_FIELD(SUN6I_HDMI_DDC_FIFO_CTRL_REG, 0, 3),
+	.field_ddc_byte_count	= REG_FIELD(SUN6I_HDMI_DDC_CMD_REG, 16, 25),
+	.field_ddc_cmd		= REG_FIELD(SUN6I_HDMI_DDC_CMD_REG, 0, 2),
+	.field_ddc_sda_en	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 6, 6),
+	.field_ddc_sck_en	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 4, 4),
+
+	.ddc_fifo_reg		= SUN6I_HDMI_DDC_FIFO_DATA_REG,
+	.ddc_fifo_thres_incl	= true,
+};
+
 static const struct regmap_config sun4i_hdmi_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
@@ -551,6 +608,7 @@ static int sun4i_hdmi_remove(struct platform_device *pdev)
 
 static const struct of_device_id sun4i_hdmi_of_table[] = {
 	{ .compatible = "allwinner,sun5i-a10s-hdmi", .data = &sun5i_variant, },
+	{ .compatible = "allwinner,sun6i-a31-hdmi", .data = &sun6i_variant, },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_hdmi_of_table);