Hdmi: add workaround to avoid screen unstable for asus VZ229h monitor

when detect asus vz229h monitor, adjust npll frequency equall to pixel clock.(640x480@75 640x480@72.81)
Auto caculate npll frequency when using 720x400 resolution.(720x400@70)

Change-Id: I7f1bb70eaaab1460198aa8b157ee7523f3c744c2

Author: gary_gen

drivers/clk/rockchip/clk-pll.c

@@ -368,9 +368,11 @@ static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
 	int i;
 	bool iex_monitor = false;
 	bool acer_kg221q_monitor = false;
+	bool asus_vz229h_monitor = false;
 
 	iex_monitor = detect_iex_monitor();
 	acer_kg221q_monitor = detect_acer_kg221q_monitor();
+	asus_vz229h_monitor = detect_asus_vz229h_monitor();
 
 	for (i = 0; i < pll->rate_count; i++) {
 		if( (rate == 85750000) && !iex_monitor)
@@ -381,6 +383,10 @@ static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
 			continue;
 		if( (rate == 170000000) && !acer_kg221q_monitor)
 			continue;
+		if( (rate == 28320000) && asus_vz229h_monitor)
+			continue;
+		if( (rate == 31500000) && (rate_table[i].nr == 1) && !asus_vz229h_monitor)
+			continue;
 		if (rate == rate_table[i].rate) {
 			if (i < pll->sel) {
 				pll->scaling = rate;

drivers/clk/rockchip/clk-rk3288.c

@@ -152,6 +152,7 @@ static struct rockchip_pll_rate_table rk3288_npll_rates[] = {
 	RK3066_PLL_RATE_NB(85500000, 2, 171, 12, 32),//1360*768@60 iex
 	RK3066_PLL_RATE_NB(78750000, 4, 210, 16, 32),//1024*768@75 iex
 	RK3066_PLL_RATE_NB(74250000, 4, 198, 16, 32),
+	RK3066_PLL_RATE_NB(31500000, 1, 21, 16, 32),//640x480@75 @72.81 ASUS VZ229H
 };
 
 #define RK3288_DIV_ACLK_CORE_M0_MASK	0xf

drivers/clk/rockchip/clk.h

@@ -187,6 +187,7 @@ struct clk;
 
 extern bool detect_iex_monitor(void);
 extern bool detect_acer_kg221q_monitor(void);
+extern bool detect_asus_vz229h_monitor(void);
 
 enum rockchip_pll_type {
 	pll_rk3036,

drivers/gpu/drm/drm_edid.c

@@ -1271,6 +1271,10 @@ static const u8 iex_edid[] = {
 static const u8 acer_kg221q_edid[] = {
 	0x04, 0x72, 0x8e, 0x05
 };
+
+static const u8 asus_vz229h_edid[] = {
+	0x06, 0xB3, 0xCC, 0x22
+};
 /**
  * drm_edid_header_is_valid - sanity check the header of the base EDID block
  * @raw_edid: pointer to raw base EDID block
@@ -1321,6 +1325,22 @@ bool drm_dect_acer_kg221q_edid(struct edid *edid)
 }
 EXPORT_SYMBOL(drm_dect_acer_kg221q_edid);
 
+bool drm_dect_asus_vz229h_edid(struct edid *edid)
+{
+	int i, score = 0;
+	u8 *raw_edid = (u8 *)edid;
+	for (i = 0; i < sizeof(asus_vz229h_edid); i++)
+		if (raw_edid[8+i] == asus_vz229h_edid[i])
+			score++;
+
+	if (score == 4)
+		return true;
+	else
+		return false;
+}
+EXPORT_SYMBOL(drm_dect_asus_vz229h_edid);
+
+
 static int edid_fixup __read_mostly = 6;
 module_param_named(edid_fixup, edid_fixup, int, 0400);
 MODULE_PARM_DESC(edid_fixup,

drivers/gpu/drm/drm_probe_helper.c

@@ -58,6 +58,7 @@
 static bool drm_kms_helper_poll = true;
 static bool drm_iex_monitor = false;
 static bool drm_acer_kg221q_monitor = false;
+static bool drm_asus_vz229h_monitor = false;
 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
 
 static enum drm_mode_status
@@ -267,6 +268,7 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect
 		edid_manufacturer = (struct edid *) connector->edid_blob_ptr->data;
 		drm_iex_monitor = drm_dect_iex_edid(edid_manufacturer);
 		drm_acer_kg221q_monitor = drm_dect_acer_kg221q_edid(edid_manufacturer);
+		drm_asus_vz229h_monitor = drm_dect_asus_vz229h_edid(edid_manufacturer);
 	}
 	list_for_each_entry(mode, &connector->modes, head) {
 		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
@@ -288,6 +290,12 @@ bool detect_acer_kg221q_monitor(void)
 }
 EXPORT_SYMBOL(detect_acer_kg221q_monitor);
 
+bool detect_asus_vz229h_monitor(void)
+{
+	return drm_asus_vz229h_monitor;
+}
+EXPORT_SYMBOL(detect_asus_vz229h_monitor);
+
 /**
  * drm_helper_probe_single_connector_modes - get complete set of display modes
  * @connector: connector to probe

include/drm/drm_crtc.h

@@ -2013,6 +2013,7 @@ extern void drm_set_preferred_mode(struct drm_connector *connector,
 extern int drm_edid_header_is_valid(const u8 *raw_edid);
 extern bool drm_dect_iex_edid(struct edid *edid);
 extern bool drm_dect_acer_kg221q_edid(struct edid *edid);
+extern bool drm_dect_asus_vz229h_edid(struct edid *edid);
 extern bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
 				 bool *edid_corrupt);
 extern bool drm_edid_is_valid(struct edid *edid);