disp: msm: dp: add support to request dp link clk through mmrm

This change adds the support to request the dp link clk rate
through the mmrm driver. In the case the system can not
support the rate, user space is notified of the failure and
dp is diconnected.

Change-Id: I4a074054ce42425ca940d4aec505723724736b44
Signed-off-by: Christina Oliveira <coliveir@codeaurora.org>

msm/dp/dp_display.c

@@ -1836,6 +1836,28 @@ static void dp_display_register_usb_notifier(struct dp_display_private *dp)
 		DP_DEBUG("failed to register for usb event: %d\n", rc);
 }
 
+int dp_display_mmrm_callback(struct mmrm_client_notifier_data *notifier_data)
+{
+	struct dss_clk_mmrm_cb *mmrm_cb_data = (struct dss_clk_mmrm_cb *)notifier_data->pvt_data;
+	struct dp_display *dp_display = (struct dp_display *)mmrm_cb_data->phandle;
+	struct dp_display_private *dp =
+		container_of(dp_display, struct dp_display_private, dp_display);
+	int ret = 0;
+
+	SDE_EVT32_EXTERNAL(SDE_EVTLOG_FUNC_ENTRY, dp->state, notifier_data->cb_type);
+	if (notifier_data->cb_type == MMRM_CLIENT_RESOURCE_VALUE_CHANGE
+				&& dp_display_state_is(DP_STATE_ENABLED)
+				&& !dp_display_state_is(DP_STATE_ABORTED)) {
+		ret = dp_display_handle_disconnect(dp);
+		if (ret)
+			DP_ERR("mmrm callback error reducing clk, ret:%d\n", ret);
+	}
+
+	DP_DEBUG("mmrm callback handled, state: 0x%x rc:%d\n", dp->state, ret);
+	SDE_EVT32_EXTERNAL(SDE_EVTLOG_FUNC_EXIT, dp->state, notifier_data->cb_type);
+	return ret;
+}
+
 static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
 {
 	dp_debug_put(dp->debug);
@@ -1940,6 +1962,13 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
 		goto error_link;
 	}
 
+	rc = dp->power->power_mmrm_init(dp->power, &dp->priv->phandle,
+		(void *)&dp->dp_display, dp_display_mmrm_callback);
+	if (rc) {
+		DP_ERR("failed to initialize mmrm, rc = %d\n", rc);
+		goto error_link;
+	}
+
 	dp->link = dp_link_get(dev, dp->aux);
 	if (IS_ERR(dp->link)) {
 		rc = PTR_ERR(dp->link);
@@ -2014,6 +2043,7 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
 	debug_in.parser = dp->parser;
 	debug_in.ctrl = dp->ctrl;
 	debug_in.pll = dp->pll;
+	debug_in.display = &dp->dp_display;
 
 	dp->debug = dp_debug_get(&debug_in);
 	if (IS_ERR(dp->debug)) {