disp: msm: dp: filter modes based on sde resource availability

Not considering the currently available sde resources and
caps while filtering/validating a mode will report unavailable
modes and result in an atomic commit failure.
DP should calculate the number of required lms and verify
if lms/3dmux are available before a validating a mode.

Change-Id: Idadcc655c30f5a831c47cf22b60085052b5b9fcd
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/dp/dp_display.c

@@ -1860,7 +1860,8 @@ end:
 
 static enum drm_mode_status dp_display_validate_mode(
 		struct dp_display *dp_display,
-		void *panel, struct drm_display_mode *mode)
+		void *panel, struct drm_display_mode *mode,
+		const struct msm_resource_caps_info *avail_res)
 {
 	struct dp_display_private *dp;
 	struct drm_dp_link *link_info;
@@ -1873,8 +1874,10 @@ static enum drm_mode_status dp_display_validate_mode(
 	int hdis, vdis, vref, ar, _hdis, _vdis, _vref, _ar, rate;
 	struct dp_display_mode dp_mode;
 	bool dsc_en;
+	u32 num_lm = 0;
 
-	if (!dp_display || !mode || !panel) {
+	if (!dp_display || !mode || !panel ||
+			!avail_res || !avail_res->max_mixer_width) {
 		pr_err("invalid params\n");
 		return mode_status;
 	}
@@ -1917,6 +1920,15 @@ static enum drm_mode_status dp_display_validate_mode(
 		goto end;
 	}
 
+	num_lm = (avail_res->max_mixer_width <= mode->hdisplay) ?
+			2 : 1;
+	if (num_lm > avail_res->num_lm ||
+			(num_lm == 2 && !avail_res->num_3dmux)) {
+		DP_MST_DEBUG("num_lm:%d, req lm:%d 3dmux:%d\n", num_lm,
+				avail_res->num_lm, avail_res->num_3dmux);
+		goto end;
+	}
+
 	/*
 	 * If the connector exists in the mst connector list and if debug is
 	 * enabled for that connector, use the mst connector settings from the