Patchwork This cherry-picked upstream patch removes an infinite

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Submitter Surbhi Palande
Date Feb. 11, 2010, 11:46 p.m.
Message ID <1265932006-4550-1-git-send-email-surbhi.palande@canonical.com>
Download mbox | patch
Permalink /patch/45165/
State Superseded
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Comments

Surbhi Palande - Feb. 11, 2010, 11:46 p.m.
From 2f8055156e9160f3d83e56122c90c3ece2e09819 Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Thu, 3 Dec 2009 17:44:36 -0500
Subject: [PATCH] [PATCH] UBUNTU [Lucid]: [Upstream] drm/edid: Unify detailed block parsing between base and extension blocks

BugLink: http://bugs.launchpad.net/bugs/500999

Also fix an embarassing bug in standard timing subblock parsing that
would result in an infinite loop.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 9cf00977da092096c7a983276dad8b3002d23a99)

Signed-off-by: Surbhi Palande <Surbhi.Palande@canonical.com>
---
 drivers/gpu/drm/drm_edid.c |  163 ++++++++++++++++---------------------------
 1 files changed, 61 insertions(+), 102 deletions(-)

Patch

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index b54ba63..d5671c3 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -834,8 +834,57 @@  static int add_standard_modes(struct drm_connector *connector, struct edid *edid
 	return modes;
 }
 
+static int add_detailed_modes(struct drm_connector *connector,
+			      struct detailed_timing *timing,
+			      struct edid *edid, u32 quirks, int preferred)
+{
+	int i, modes = 0;
+	struct detailed_non_pixel *data = &timing->data.other_data;
+	int timing_level = standard_timing_level(edid);
+	struct drm_display_mode *newmode;
+	struct drm_device *dev = connector->dev;
+
+	if (timing->pixel_clock) {
+		newmode = drm_mode_detailed(dev, edid, timing, quirks);
+		if (!newmode)
+			return 0;
+
+		if (preferred)
+			newmode->type |= DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_probed_add(connector, newmode);
+		return 1;
+	}
+
+	/* other timing types */
+	switch (data->type) {
+	case EDID_DETAIL_MONITOR_RANGE:
+		/* Get monitor range data */
+		break;
+	case EDID_DETAIL_STD_MODES:
+		/* Six modes per detailed section */
+		for (i = 0; i < 6; i++) {
+			struct std_timing *std;
+			struct drm_display_mode *newmode;
+
+			std = &data->data.timings[i];
+			newmode = drm_mode_std(dev, std, edid->revision,
+					       timing_level);
+			if (newmode) {
+				drm_mode_probed_add(connector, newmode);
+				modes++;
+			}
+		}
+		break;
+	default:
+		break;
+	}
+
+	return modes;
+}
+
 /**
- * add_detailed_modes - get detailed mode info from EDID data
+ * add_detailed_info - get detailed mode info from EDID data
  * @connector: attached connector
  * @edid: EDID block to scan
  * @quirks: quirks to apply
@@ -846,67 +895,24 @@  static int add_standard_modes(struct drm_connector *connector, struct edid *edid
 static int add_detailed_info(struct drm_connector *connector,
 			     struct edid *edid, u32 quirks)
 {
-	struct drm_device *dev = connector->dev;
-	int i, j, modes = 0;
-	int timing_level;
-
-	timing_level = standard_timing_level(edid);
+	int i, modes = 0;
 
 	for (i = 0; i < EDID_DETAILED_TIMINGS; i++) {
 		struct detailed_timing *timing = &edid->detailed_timings[i];
-		struct detailed_non_pixel *data = &timing->data.other_data;
-		struct drm_display_mode *newmode;
-
-		/* X server check is version 1.1 or higher */
-		if (edid->version == 1 && edid->revision >= 1 &&
-		    !timing->pixel_clock) {
-			/* Other timing or info */
-			switch (data->type) {
-			case EDID_DETAIL_MONITOR_SERIAL:
-				break;
-			case EDID_DETAIL_MONITOR_STRING:
-				break;
-			case EDID_DETAIL_MONITOR_RANGE:
-				/* Get monitor range data */
-				break;
-			case EDID_DETAIL_MONITOR_NAME:
-				break;
-			case EDID_DETAIL_MONITOR_CPDATA:
-				break;
-			case EDID_DETAIL_STD_MODES:
-				for (j = 0; j < 6; i++) {
-					struct std_timing *std;
-					struct drm_display_mode *newmode;
-
-					std = &data->data.timings[j];
-					newmode = drm_mode_std(dev, std,
-							       edid->revision,
-							       timing_level);
-					if (newmode) {
-						drm_mode_probed_add(connector, newmode);
-						modes++;
-					}
-				}
-				break;
-			default:
-				break;
-			}
-		} else {
-			newmode = drm_mode_detailed(dev, edid, timing, quirks);
-			if (!newmode)
-				continue;
+		int preferred = (i == 0) && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING);
 
-			/* First detailed mode is preferred */
-			if (i == 0 && (edid->features & DRM_EDID_FEATURE_PREFERRED_TIMING))
-				newmode->type |= DRM_MODE_TYPE_PREFERRED;
-			drm_mode_probed_add(connector, newmode);
+		/* In 1.0, only timings are allowed */
+		if (!timing->pixel_clock && edid->version == 1 &&
+			edid->revision == 0)
+			continue;
 
-			modes++;
-		}
+		modes += add_detailed_modes(connector, timing, edid, quirks,
+					    preferred);
 	}
 
 	return modes;
 }
+
 /**
  * add_detailed_mode_eedid - get detailed mode info from addtional timing
  * 			EDID block
@@ -920,12 +926,9 @@  static int add_detailed_info(struct drm_connector *connector,
 static int add_detailed_info_eedid(struct drm_connector *connector,
 			     struct edid *edid, u32 quirks)
 {
-	struct drm_device *dev = connector->dev;
-	int i, j, modes = 0;
+	int i, modes = 0;
 	char *edid_ext = NULL;
 	struct detailed_timing *timing;
-	struct detailed_non_pixel *data;
-	struct drm_display_mode *newmode;
 	int edid_ext_num;
 	int start_offset, end_offset;
 	int timing_level;
@@ -976,51 +979,7 @@  static int add_detailed_info_eedid(struct drm_connector *connector,
 	for (i = start_offset; i < end_offset;
 			i += sizeof(struct detailed_timing)) {
 		timing = (struct detailed_timing *)(edid_ext + i);
-		data = &timing->data.other_data;
-		/* Detailed mode timing */
-		if (timing->pixel_clock) {
-			newmode = drm_mode_detailed(dev, edid, timing, quirks);
-			if (!newmode)
-				continue;
-
-			drm_mode_probed_add(connector, newmode);
-
-			modes++;
-			continue;
-		}
-
-		/* Other timing or info */
-		switch (data->type) {
-		case EDID_DETAIL_MONITOR_SERIAL:
-			break;
-		case EDID_DETAIL_MONITOR_STRING:
-			break;
-		case EDID_DETAIL_MONITOR_RANGE:
-			/* Get monitor range data */
-			break;
-		case EDID_DETAIL_MONITOR_NAME:
-			break;
-		case EDID_DETAIL_MONITOR_CPDATA:
-			break;
-		case EDID_DETAIL_STD_MODES:
-			/* Five modes per detailed section */
-			for (j = 0; j < 5; i++) {
-				struct std_timing *std;
-				struct drm_display_mode *newmode;
-
-				std = &data->data.timings[j];
-				newmode = drm_mode_std(dev, std,
-						       edid->revision,
-						       timing_level);
-				if (newmode) {
-					drm_mode_probed_add(connector, newmode);
-					modes++;
-				}
-			}
-			break;
-		default:
-			break;
-		}
+		modes += add_detailed_modes(connector, timing, edid, quirks, 0);
 	}
 
 	return modes;