From e1264710c08a72b8f75e260c0607d871a5e0f47f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 24 Jan 2020 22:02:26 +0200
Subject: drm/edid: Introduce is_detailed_timing_descritor()
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Git-commit: f447dd1fa3f55497b16e6b5e6c7ac89aa8171fac
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

Let's introduce is_detailed_timing_descritor() as the opposite
counterpart of is_display_descriptor().

Cc: Allen Chen <allen.chen@ite.com.tw>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200124200231.10517-3-ville.syrjala@linux.intel.com
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/drm_edid.c | 42 ++++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 47da388ccc59..510782f77fc7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2218,6 +2218,11 @@ static bool is_display_descriptor(const u8 d[18], u8 tag)
 		d[2] == 0x00 && d[3] == tag;
 }
 
+static bool is_detailed_timing_descriptor(const u8 d[18])
+{
+	return d[0] != 0x00 || d[1] != 0x00;
+}
+
 typedef void detailed_cb(struct detailed_timing *timing, void *closure);
 
 static void
@@ -3117,27 +3122,28 @@ do_detailed_mode(struct detailed_timing *timing, void *c)
 	struct detailed_mode_closure *closure = c;
 	struct drm_display_mode *newmode;
 
-	if (timing->pixel_clock) {
-		newmode = drm_mode_detailed(closure->connector->dev,
-					    closure->edid, timing,
-					    closure->quirks);
-		if (!newmode)
-			return;
+	if (!is_detailed_timing_descriptor((const u8 *)timing))
+		return;
+
+	newmode = drm_mode_detailed(closure->connector->dev,
+				    closure->edid, timing,
+				    closure->quirks);
+	if (!newmode)
+		return;
 
-		if (closure->preferred)
-			newmode->type |= DRM_MODE_TYPE_PREFERRED;
+	if (closure->preferred)
+		newmode->type |= DRM_MODE_TYPE_PREFERRED;
 
-		/*
-		 * Detailed modes are limited to 10kHz pixel clock resolution,
-		 * so fix up anything that looks like CEA/HDMI mode, but the clock
-		 * is just slightly off.
-		 */
-		fixup_detailed_cea_mode_clock(newmode);
+	/*
+	 * Detailed modes are limited to 10kHz pixel clock resolution,
+	 * so fix up anything that looks like CEA/HDMI mode, but the clock
+	 * is just slightly off.
+	 */
+	fixup_detailed_cea_mode_clock(newmode);
 
-		drm_mode_probed_add(closure->connector, newmode);
-		closure->modes++;
-		closure->preferred = false;
-	}
+	drm_mode_probed_add(closure->connector, newmode);
+	closure->modes++;
+	closure->preferred = false;
 }
 
 /*
-- 
2.28.0