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From:   Jernej Skrabec <jernej.skrabec@siol.net>
To:     maxime.ripard@free-electrons.com, wens@csie.org, airlied@linux.ie,
        robh+dt@kernel.org, mark.rutland@arm.com, mturquette@baylibre.com,
        sboyd@kernel.org
Cc:     jernej.skrabec@siol.net, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-sunxi@googlegroups.com
Subject: [PATCH v3 10/16] drm/sun4i: Add support for variants to DW HDMI PHY
Date:   Thu,  1 Mar 2018 22:34:36 +0100
Message-Id: <20180301213442.16677-11-jernej.skrabec@siol.net>
In-Reply-To: <20180301213442.16677-1-jernej.skrabec@siol.net>
References: <20180301213442.16677-1-jernej.skrabec@siol.net>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

There are multiple variants of DW HDMI PHYs in Allwinner SoCs. While
some things like clock and reset setup are the same, PHY configuration
differs a lot.

Split out code which is PHY specific to separate functions and create
a structure which holds pointers to those functions.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h  | 20 ++++++--
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 89 +++++++++++++++++++++++-----------
 2 files changed, 76 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
index d8d0684fc8aa..1e9eb6072615 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
@@ -12,11 +12,23 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>
 
+struct sun8i_hdmi_phy;
+
+struct sun8i_hdmi_phy_variant {
+	void (*phy_init)(struct sun8i_hdmi_phy *phy);
+	void (*phy_disable)(struct dw_hdmi *hdmi,
+			    struct sun8i_hdmi_phy *phy);
+	int  (*phy_config)(struct dw_hdmi *hdmi,
+			   struct sun8i_hdmi_phy *phy,
+			   unsigned int clk_rate);
+};
+
 struct sun8i_hdmi_phy {
-	struct clk		*clk_bus;
-	struct clk		*clk_mod;
-	struct regmap		*regs;
-	struct reset_control	*rst_phy;
+	struct clk			*clk_bus;
+	struct clk			*clk_mod;
+	struct regmap			*regs;
+	struct reset_control		*rst_phy;
+	struct sun8i_hdmi_phy_variant	*variant;
 };
 
 struct sun8i_dw_hdmi {
diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
index 9d2f11ca3538..17aada64bafd 100644
--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
@@ -30,21 +30,10 @@
  */
 #define I2C_ADDR	0x69
 
-static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi, void *data,
-				 struct drm_display_mode *mode)
+static int sun8i_hdmi_phy_config_a83t(struct dw_hdmi *hdmi,
+				      struct sun8i_hdmi_phy *phy,
+				      unsigned int clk_rate)
 {
-	struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
-	u32 val = 0;
-
-	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
-		val |= SUN8I_HDMI_PHY_DBG_CTRL_POL_NHSYNC;
-
-	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
-		val |= SUN8I_HDMI_PHY_DBG_CTRL_POL_NVSYNC;
-
-	regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
-			   SUN8I_HDMI_PHY_DBG_CTRL_POL_MASK, val);
-
 	regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_REXT_CTRL_REG,
 			   SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN,
 			   SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN);
@@ -64,21 +53,21 @@ static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi, void *data,
 	 * release any documentation, explanation of this values can
 	 * be found in i.MX 6Dual/6Quad Reference Manual.
 	 */
-	if (mode->crtc_clock <= 27000) {
+	if (clk_rate <= 27000000) {
 		dw_hdmi_phy_i2c_write(hdmi, 0x01e0, 0x06);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x15);
 		dw_hdmi_phy_i2c_write(hdmi, 0x08da, 0x10);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0007, 0x19);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0318, 0x0e);
 		dw_hdmi_phy_i2c_write(hdmi, 0x8009, 0x09);
-	} else if (mode->crtc_clock <= 74250) {
+	} else if (clk_rate <= 74250000) {
 		dw_hdmi_phy_i2c_write(hdmi, 0x0540, 0x06);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0005, 0x15);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x10);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0007, 0x19);
 		dw_hdmi_phy_i2c_write(hdmi, 0x02b5, 0x0e);
 		dw_hdmi_phy_i2c_write(hdmi, 0x8009, 0x09);
-	} else if (mode->crtc_clock <= 148500) {
+	} else if (clk_rate <= 148500000) {
 		dw_hdmi_phy_i2c_write(hdmi, 0x04a0, 0x06);
 		dw_hdmi_phy_i2c_write(hdmi, 0x000a, 0x15);
 		dw_hdmi_phy_i2c_write(hdmi, 0x0000, 0x10);
@@ -103,10 +92,27 @@ static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi, void *data,
 	return 0;
 };
 
-static void sun8i_hdmi_phy_disable(struct dw_hdmi *hdmi, void *data)
+static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi, void *data,
+				 struct drm_display_mode *mode)
 {
 	struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
+	u32 val = 0;
+
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+		val |= SUN8I_HDMI_PHY_DBG_CTRL_POL_NHSYNC;
 
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		val |= SUN8I_HDMI_PHY_DBG_CTRL_POL_NVSYNC;
+
+	regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
+			   SUN8I_HDMI_PHY_DBG_CTRL_POL_MASK, val);
+
+	return phy->variant->phy_config(hdmi, phy, mode->crtc_clock * 1000);
+};
+
+static void sun8i_hdmi_phy_disable_a83t(struct dw_hdmi *hdmi,
+					struct sun8i_hdmi_phy *phy)
+{
 	dw_hdmi_phy_gen2_txpwron(hdmi, 0);
 	dw_hdmi_phy_gen2_pddq(hdmi, 1);
 
@@ -114,6 +120,13 @@ static void sun8i_hdmi_phy_disable(struct dw_hdmi *hdmi, void *data)
 			   SUN8I_HDMI_PHY_REXT_CTRL_REXT_EN, 0);
 }
 
+static void sun8i_hdmi_phy_disable(struct dw_hdmi *hdmi, void *data)
+{
+	struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
+
+	phy->variant->phy_disable(hdmi, phy);
+}
+
 static const struct dw_hdmi_phy_ops sun8i_hdmi_phy_ops = {
 	.init = &sun8i_hdmi_phy_config,
 	.disable = &sun8i_hdmi_phy_disable,
@@ -122,16 +135,8 @@ static const struct dw_hdmi_phy_ops sun8i_hdmi_phy_ops = {
 	.setup_hpd = &dw_hdmi_phy_setup_hpd,
 };
 
-void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy)
+static void sun8i_hdmi_phy_init_a83t(struct sun8i_hdmi_phy *phy)
 {
-	/* enable read access to HDMI controller */
-	regmap_write(phy->regs, SUN8I_HDMI_PHY_READ_EN_REG,
-		     SUN8I_HDMI_PHY_READ_EN_MAGIC);
-
-	/* unscramble register offsets */
-	regmap_write(phy->regs, SUN8I_HDMI_PHY_UNSCRAMBLE_REG,
-		     SUN8I_HDMI_PHY_UNSCRAMBLE_MAGIC);
-
 	regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
 			   SUN8I_HDMI_PHY_DBG_CTRL_PX_LOCK,
 			   SUN8I_HDMI_PHY_DBG_CTRL_PX_LOCK);
@@ -145,6 +150,19 @@ void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy)
 			   SUN8I_HDMI_PHY_DBG_CTRL_ADDR(I2C_ADDR));
 }
 
+void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy)
+{
+	/* enable read access to HDMI controller */
+	regmap_write(phy->regs, SUN8I_HDMI_PHY_READ_EN_REG,
+		     SUN8I_HDMI_PHY_READ_EN_MAGIC);
+
+	/* unscramble register offsets */
+	regmap_write(phy->regs, SUN8I_HDMI_PHY_UNSCRAMBLE_REG,
+		     SUN8I_HDMI_PHY_UNSCRAMBLE_MAGIC);
+
+	phy->variant->phy_init(phy);
+}
+
 const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void)
 {
 	return &sun8i_hdmi_phy_ops;
@@ -158,20 +176,31 @@ static struct regmap_config sun8i_hdmi_phy_regmap_config = {
 	.name		= "phy"
 };
 
+static const struct sun8i_hdmi_phy_variant sun8i_a83t_hdmi_phy = {
+	.phy_init = &sun8i_hdmi_phy_init_a83t,
+	.phy_disable = &sun8i_hdmi_phy_disable_a83t,
+	.phy_config = &sun8i_hdmi_phy_config_a83t,
+};
+
 static const struct of_device_id sun8i_hdmi_phy_of_table[] = {
-	{ .compatible = "allwinner,sun8i-a83t-hdmi-phy" },
+	{
+		.compatible = "allwinner,sun8i-a83t-hdmi-phy",
+		.data = &sun8i_a83t_hdmi_phy,
+	},
 	{ /* sentinel */ }
 };
 
 int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 {
+	const struct of_device_id *match;
 	struct device *dev = hdmi->dev;
 	struct sun8i_hdmi_phy *phy;
 	struct resource res;
 	void __iomem *regs;
 	int ret;
 
-	if (!of_match_node(sun8i_hdmi_phy_of_table, node)) {
+	match = of_match_node(sun8i_hdmi_phy_of_table, node);
+	if (!match) {
 		dev_err(dev, "Incompatible HDMI PHY\n");
 		return -EINVAL;
 	}
@@ -180,6 +209,8 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 	if (!phy)
 		return -ENOMEM;
 
+	phy->variant = (struct sun8i_hdmi_phy_variant *)match->data;
+
 	ret = of_address_to_resource(node, 0, &res);
 	if (ret) {
 		dev_err(dev, "phy: Couldn't get our resources\n");
-- 
2.16.2