OMAP4: DSS2: HDMI: Function pointer approach to call

HDMI IP fundamentally has replaceable core PHY and PLL blocks.
These blocks might vary across OMAP's but the end functionality such as to
enable or disable PLL, PHY, function to read EDID would remain the same.

Thus to make the current hdmi DSS driver compatible with different OMAP's having
different IP blocks( A combination of different core, PHY, PLL blocks), function
pointer approach is introduced.

With function pointer, relevant IP dependent functions are mapped to the generic
functions used by DSS during the initialization based on the OMAP compiled.
Thus making hdmi DSS driver IP agnostic.

Signed-off-by: Mythri P K <mythripk@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dss_features.c

@@ -429,6 +429,26 @@ static const struct omap_dss_features omap4_dss_features = {
 	.burst_size_unit = 16,
 };
 
+#if defined(CONFIG_OMAP4_DSS_HDMI)
+/* HDMI OMAP4 Functions*/
+static const struct ti_hdmi_ip_ops omap4_hdmi_functions = {
+
+	.video_configure	=	ti_hdmi_4xxx_basic_configure,
+	.phy_enable		=	ti_hdmi_4xxx_phy_enable,
+	.phy_disable		=	ti_hdmi_4xxx_phy_disable,
+	.read_edid		=	ti_hdmi_4xxx_read_edid,
+	.pll_enable		=	ti_hdmi_4xxx_pll_enable,
+	.pll_disable		=	ti_hdmi_4xxx_pll_disable,
+	.video_enable		=	ti_hdmi_4xxx_wp_video_start,
+};
+
+void dss_init_hdmi_ip_ops(struct hdmi_ip_data *ip_data)
+{
+	if (cpu_is_omap44xx())
+		ip_data->ops = &omap4_hdmi_functions;
+}
+#endif
+
 /* Functions returning values related to a DSS feature */
 int dss_feat_get_num_mgrs(void)
 {

drivers/video/omap2/dss/dss_features.h

@@ -20,6 +20,10 @@
 #ifndef __OMAP2_DSS_FEATURES_H
 #define __OMAP2_DSS_FEATURES_H
 
+#if defined(CONFIG_OMAP4_DSS_HDMI)
+#include "ti_hdmi.h"
+#endif
+
 #define MAX_DSS_MANAGERS	3
 #define MAX_DSS_OVERLAYS	3
 #define MAX_DSS_LCD_MANAGERS	2
@@ -99,4 +103,7 @@ u32 dss_feat_get_burst_size_unit(void);		/* in bytes */
 bool dss_has_feature(enum dss_feat_id id);
 void dss_feat_get_reg_field(enum dss_feat_reg_field id, u8 *start, u8 *end);
 void dss_features_init(void);
+#if defined(CONFIG_OMAP4_DSS_HDMI)
+void dss_init_hdmi_ip_ops(struct hdmi_ip_data *ip_data);
+#endif
 #endif

drivers/video/omap2/dss/hdmi.c

@@ -186,6 +186,7 @@ int hdmi_init_display(struct omap_dss_device *dssdev)
 {
 	DSSDBG("init_display\n");
 
+	dss_init_hdmi_ip_ops(&hdmi.ip_data);
 	return 0;
 }
 
@@ -366,7 +367,7 @@ static void hdmi_read_edid(struct omap_video_timings *dp)
 	memset(hdmi.edid, 0, HDMI_EDID_MAX_LENGTH);
 
 	if (!hdmi.edid_set)
-		ret = ti_hdmi_4xxx_read_edid(&hdmi.ip_data, hdmi.edid,
+		ret = hdmi.ip_data.ops->read_edid(&hdmi.ip_data, hdmi.edid,
 						HDMI_EDID_MAX_LENGTH);
 	if (!ret) {
 		if (!memcmp(hdmi.edid, edid_header, sizeof(edid_header))) {
@@ -480,16 +481,16 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 
 	hdmi_compute_pll(dssdev, phy, &hdmi.ip_data.pll_data);
 
-	ti_hdmi_4xxx_wp_video_start(&hdmi.ip_data, 0);
+	hdmi.ip_data.ops->video_enable(&hdmi.ip_data, 0);
 
 	/* config the PLL and PHY hdmi_set_pll_pwrfirst */
-	r = ti_hdmi_4xxx_pll_enable(&hdmi.ip_data);
+	r = hdmi.ip_data.ops->pll_enable(&hdmi.ip_data);
 	if (r) {
 		DSSDBG("Failed to lock PLL\n");
 		goto err;
 	}
 
-	r = ti_hdmi_4xxx_phy_enable(&hdmi.ip_data);
+	r = hdmi.ip_data.ops->phy_enable(&hdmi.ip_data);
 	if (r) {
 		DSSDBG("Failed to start PHY\n");
 		goto err;
@@ -497,7 +498,7 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 
 	hdmi.ip_data.cfg.cm.mode = hdmi.mode;
 	hdmi.ip_data.cfg.cm.code = hdmi.code;
-	ti_hdmi_4xxx_basic_configure(&hdmi.ip_data);
+	hdmi.ip_data.ops->video_configure(&hdmi.ip_data);
 
 	/* Make selection of HDMI in DSS */
 	dss_select_hdmi_venc_clk_source(DSS_HDMI_M_PCLK);
@@ -519,7 +520,7 @@ static int hdmi_power_on(struct omap_dss_device *dssdev)
 
 	dispc_mgr_enable(OMAP_DSS_CHANNEL_DIGIT, 1);
 
-	ti_hdmi_4xxx_wp_video_start(&hdmi.ip_data, 1);
+	hdmi.ip_data.ops->video_enable(&hdmi.ip_data, 1);
 
 	return 0;
 err:
@@ -531,9 +532,9 @@ static void hdmi_power_off(struct omap_dss_device *dssdev)
 {
 	dispc_mgr_enable(OMAP_DSS_CHANNEL_DIGIT, 0);
 
-	ti_hdmi_4xxx_wp_video_start(&hdmi.ip_data, 0);
-	ti_hdmi_4xxx_phy_disable(&hdmi.ip_data);
-	ti_hdmi_4xxx_pll_disable(&hdmi.ip_data);
+	hdmi.ip_data.ops->video_enable(&hdmi.ip_data, 0);
+	hdmi.ip_data.ops->phy_disable(&hdmi.ip_data);
+	hdmi.ip_data.ops->pll_disable(&hdmi.ip_data);
 	hdmi_runtime_put();
 
 	hdmi.edid_set = 0;

drivers/video/omap2/dss/ti_hdmi.h

@@ -21,6 +21,8 @@
 #ifndef _TI_HDMI_H
 #define _TI_HDMI_H
 
+struct hdmi_ip_data;
+
 enum hdmi_pll_pwr {
 	HDMI_PLLPWRCMD_ALLOFF = 0,
 	HDMI_PLLPWRCMD_PLLONLY = 1,
@@ -82,12 +84,31 @@ struct hdmi_pll_info {
 	enum hdmi_clk_refsel refsel;
 };
 
+struct ti_hdmi_ip_ops {
+
+	void (*video_configure)(struct hdmi_ip_data *ip_data);
+
+	int (*phy_enable)(struct hdmi_ip_data *ip_data);
+
+	void (*phy_disable)(struct hdmi_ip_data *ip_data);
+
+	int (*read_edid)(struct hdmi_ip_data *ip_data,
+			u8 *pedid, u16 max_length);
+
+	int (*pll_enable)(struct hdmi_ip_data *ip_data);
+
+	void (*pll_disable)(struct hdmi_ip_data *ip_data);
+
+	void (*video_enable)(struct hdmi_ip_data *ip_data, bool start);
+};
+
 struct hdmi_ip_data {
 	void __iomem	*base_wp;	/* HDMI wrapper */
 	unsigned long	core_sys_offset;
 	unsigned long	core_av_offset;
 	unsigned long	pll_offset;
 	unsigned long	phy_offset;
+	const struct ti_hdmi_ip_ops *ops;
 	struct hdmi_config cfg;
 	struct hdmi_pll_info pll_data;
 };