From 2f5dc676bf19f2e9601421924f2de67fa7a599b0 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Thu, 17 Apr 2014 12:54:02 +0300
Subject: [PATCH] OMAPDSS: HDMI: lane config support

Add support to configure the pins used for the HDMI lanes. The order and
polarity of the lanes can be defined in the DT data.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/video/fbdev/omap2/dss/hdmi.h        |  6 ++
 drivers/video/fbdev/omap2/dss/hdmi4.c       | 28 ++++++
 drivers/video/fbdev/omap2/dss/hdmi_common.c | 41 +++++++++
 drivers/video/fbdev/omap2/dss/hdmi_phy.c    | 94 ++++++++++++++++++++-
 4 files changed, 167 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/omap2/dss/hdmi.h b/drivers/video/fbdev/omap2/dss/hdmi.h
index e25681ff5a70..4e5c44e7eeb3 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi.h
+++ b/drivers/video/fbdev/omap2/dss/hdmi.h
@@ -352,6 +352,9 @@ struct hdmi_phy_data {
 	void __iomem *base;
 
 	int irq;
+
+	u8 lane_function[4];
+	u8 lane_polarity[4];
 };
 
 struct hdmi_core_data {
@@ -422,11 +425,14 @@ int hdmi_phy_enable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp,
 void hdmi_phy_disable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp);
 void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s);
 int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy);
+int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes);
 
 /* HDMI common funcs */
 const struct hdmi_config *hdmi_default_timing(void);
 const struct hdmi_config *hdmi_get_timings(int mode, int code);
 struct hdmi_cm hdmi_get_code(struct omap_video_timings *timing);
+int hdmi_parse_lanes_of(struct platform_device *pdev, struct device_node *ep,
+	struct hdmi_phy_data *phy);
 
 #if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
 int hdmi_compute_acr(u32 pclk, u32 sample_freq, u32 *n, u32 *cts);
diff --git a/drivers/video/fbdev/omap2/dss/hdmi4.c b/drivers/video/fbdev/omap2/dss/hdmi4.c
index f5f7944a1fd1..e15b89d49c28 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi4.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi4.c
@@ -600,6 +600,28 @@ static void __exit hdmi_uninit_output(struct platform_device *pdev)
 	omapdss_unregister_output(out);
 }
 
+static int hdmi_probe_of(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct device_node *ep;
+	int r;
+
+	ep = omapdss_of_get_first_endpoint(node);
+	if (!ep)
+		return 0;
+
+	r = hdmi_parse_lanes_of(pdev, ep, &hdmi.phy);
+	if (r)
+		goto err;
+
+	of_node_put(ep);
+	return 0;
+
+err:
+	of_node_put(ep);
+	return r;
+}
+
 /* HDMI HW IP initialisation */
 static int omapdss_hdmihw_probe(struct platform_device *pdev)
 {
@@ -609,6 +631,12 @@ static int omapdss_hdmihw_probe(struct platform_device *pdev)
 
 	mutex_init(&hdmi.lock);
 
+	if (pdev->dev.of_node) {
+		r = hdmi_probe_of(pdev);
+		if (r)
+			return r;
+	}
+
 	r = hdmi_wp_init(pdev, &hdmi.wp);
 	if (r)
 		return r;
diff --git a/drivers/video/fbdev/omap2/dss/hdmi_common.c b/drivers/video/fbdev/omap2/dss/hdmi_common.c
index 0b12a3f62fe1..9a2c39cf297f 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi_common.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi_common.c
@@ -17,6 +17,7 @@
 
 #include <linux/kernel.h>
 #include <linux/err.h>
+#include <linux/of.h>
 #include <video/omapdss.h>
 
 #include "hdmi.h"
@@ -323,6 +324,46 @@ end:
 	return cm;
 }
 
+int hdmi_parse_lanes_of(struct platform_device *pdev, struct device_node *ep,
+	struct hdmi_phy_data *phy)
+{
+	struct property *prop;
+	int r, len;
+
+	prop = of_find_property(ep, "lanes", &len);
+	if (prop) {
+		u32 lanes[8];
+
+		if (len / sizeof(u32) != ARRAY_SIZE(lanes)) {
+			dev_err(&pdev->dev, "bad number of lanes\n");
+			return -EINVAL;
+		}
+
+		r = of_property_read_u32_array(ep, "lanes", lanes,
+			ARRAY_SIZE(lanes));
+		if (r) {
+			dev_err(&pdev->dev, "failed to read lane data\n");
+			return r;
+		}
+
+		r = hdmi_phy_parse_lanes(phy, lanes);
+		if (r) {
+			dev_err(&pdev->dev, "failed to parse lane data\n");
+			return r;
+		}
+	} else {
+		static const u32 default_lanes[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
+
+		r = hdmi_phy_parse_lanes(phy, default_lanes);
+		if (WARN_ON(r)) {
+			dev_err(&pdev->dev, "failed to parse lane data\n");
+			return r;
+		}
+	}
+
+	return 0;
+}
+
 #if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
 int hdmi_compute_acr(u32 pclk, u32 sample_freq, u32 *n, u32 *cts)
 {
diff --git a/drivers/video/fbdev/omap2/dss/hdmi_phy.c b/drivers/video/fbdev/omap2/dss/hdmi_phy.c
index dd376ce8da01..c1c65624fd5d 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi_phy.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi_phy.c
@@ -59,6 +59,97 @@ static irqreturn_t hdmi_irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
+{
+	int i;
+
+	for (i = 0; i < 8; i += 2) {
+		u8 lane, pol;
+		int dx, dy;
+
+		dx = lanes[i];
+		dy = lanes[i + 1];
+
+		if (dx < 0 || dx >= 8)
+			return -EINVAL;
+
+		if (dy < 0 || dy >= 8)
+			return -EINVAL;
+
+		if (dx & 1) {
+			if (dy != dx - 1)
+				return -EINVAL;
+			pol = 1;
+		} else {
+			if (dy != dx + 1)
+				return -EINVAL;
+			pol = 0;
+		}
+
+		lane = dx / 2;
+
+		phy->lane_function[lane] = i / 2;
+		phy->lane_polarity[lane] = pol;
+	}
+
+	return 0;
+}
+
+static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
+{
+	static const u16 pad_cfg_list[] = {
+		0x0123,
+		0x0132,
+		0x0312,
+		0x0321,
+		0x0231,
+		0x0213,
+		0x1023,
+		0x1032,
+		0x3012,
+		0x3021,
+		0x2031,
+		0x2013,
+		0x1203,
+		0x1302,
+		0x3102,
+		0x3201,
+		0x2301,
+		0x2103,
+		0x1230,
+		0x1320,
+		0x3120,
+		0x3210,
+		0x2310,
+		0x2130,
+	};
+
+	u16 lane_cfg = 0;
+	int i;
+	unsigned lane_cfg_val;
+	u16 pol_val = 0;
+
+	for (i = 0; i < 4; ++i)
+		lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
+
+	pol_val |= phy->lane_polarity[0] << 0;
+	pol_val |= phy->lane_polarity[1] << 3;
+	pol_val |= phy->lane_polarity[2] << 2;
+	pol_val |= phy->lane_polarity[3] << 1;
+
+	for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
+		if (pad_cfg_list[i] == lane_cfg)
+			break;
+
+	if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
+		i = 0;
+
+	lane_cfg_val = i;
+
+	REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
+	REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
+}
+
 int hdmi_phy_enable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp,
 			struct hdmi_config *cfg)
 {
@@ -92,8 +183,7 @@ int hdmi_phy_enable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp,
 	/* Setup max LDO voltage */
 	REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
 
-	/* Write to phy address 3 to change the polarity control */
-	REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, 0x1, 27, 27);
+	hdmi_phy_configure_lanes(phy);
 
 	r = request_threaded_irq(phy->irq, NULL, hdmi_irq_handler,
 				IRQF_ONESHOT, "OMAP HDMI", wp);