[Intel-gfx] [PATCH 3/3] Fix EDID for LVDS output device to add the default modes

[yakui_zhao]

Fix the EDID for the LVDS output device to add the default modes.This is 
similar to what we have done in UMS mode.
a. When there exists the EDID, either find the DS_RANGES block or replace
a DS_VENDOR block, smashing it into a DS_RANGES block with open refresh
to match all the defaults modes.
b. When there is no EDID, we will construct a bogus EDID and add a DS_RANGES
block with the open refresh to match all the default modes.

Signed-off-by: Zhao Yakui <yakui.zhao at intel.com>
---
 src/drmmode_display.c |  128 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)

Index: xf86_video_intel/src/drmmode_display.c
===================================================================
--- xf86_video_intel.orig/src/drmmode_display.c	2009-05-25 13:03:15.000000000 +0800
+++ xf86_video_intel/src/drmmode_display.c	2009-05-25 14:15:24.000000000 +0800
@@ -489,6 +489,133 @@
 	return MODE_OK;
 }
 
+static void fill_detailed_lvds_block (
+			struct detailed_monitor_section *det_mon,
+			DisplayModePtr mode)
+{
+    struct detailed_timings *timing = &det_mon->section.d_timings;
+    det_mon->type = DT;
+    timing->clock = mode->Clock * 1000;
+    timing->h_active = mode->HDisplay;
+    timing->h_blanking = mode->HTotal - mode->HDisplay;
+    timing->v_active = mode->VDisplay;
+    timing->v_blanking = mode->VTotal - mode->VDisplay;
+    timing->h_sync_off = mode->HSyncStart - mode->HDisplay;
+    timing->h_sync_width = mode->HSyncEnd - mode->HSyncStart;
+    timing->v_sync_off = mode->VSyncStart - mode->VDisplay;
+    timing->v_sync_width = mode->VSyncEnd - mode->VSyncStart;
+
+    if (mode->Flags & V_PVSYNC)
+        timing->misc |= 0x02;
+
+    if (mode->Flags & V_PHSYNC)
+        timing->misc |= 0x01;
+}
+
+static int drmmode_output_lvds_edid(xf86OutputPtr output,
+				struct fixed_panel_lvds *p_lvds)
+{
+	drmmode_output_private_ptr drmmode_output = output->driver_private;
+	drmModeConnectorPtr koutput = drmmode_output->mode_output;
+	int i, j;
+	DisplayModePtr pmode;
+	xf86MonPtr	edid_mon;
+	drmModeModeInfo *mode_ptr;
+	struct detailed_monitor_section *det_mon;
+
+	if (output->MonInfo) {
+		/*
+		 * If there exists the EDID, we will either find a DS_RANGES
+		 * or replace a DS_VENDOR block, smashing it into a DS_RANGES
+		 * block with opern refresh to match all the default modes.
+		 */
+		int edid_det_block_num;
+		edid_mon = output->MonInfo;
+		edid_mon->features.msc |= 0x01;
+		j = -1;
+		edid_det_block_num = sizeof(edid_mon->det_mon) /
+					sizeof(edid_mon->det_mon[0]);
+		for (i = 0; i < edid_det_block_num; i++)
+		{
+	    		if (edid_mon->det_mon[i].type >= DS_VENDOR && j == -1)
+				j = i;
+	    		if (edid_mon->det_mon[i].type == DS_RANGES) {
+				j = i;
+				break;
+	    		}
+		}
+		if (j != -1) {
+			struct monitor_ranges	*ranges =
+				&edid_mon->det_mon[j].section.ranges;
+			edid_mon->det_mon[j].type = DS_RANGES;
+			ranges->min_v = 0;
+			ranges->max_v = 200;
+			ranges->min_h = 0;
+			ranges->max_h = 200;
+		}
+		return 0;
+	}
+	/*
+	 * If there is no EDID, we will construct a bogus EDID for LVDS output
+	 * device. This is similar to what we have done in i830_lvds.c
+	 */
+	edid_mon = NULL;
+	edid_mon = xcalloc(1, sizeof(xf86Monitor));
+	if (!edid_mon) {
+		xf86DrvMsg(output->scrn->scrnIndex, X_ERROR,
+			"Can't allocate memory for edid_mon.\n");
+		return 0;
+	}
+	/* Find the fixed panel mode.
+	 * In theory when there is no EDID, KMS kernel will return only one
+	 * mode. And this can be regarded as fixed lvds panel mode.
+	 * But it will be better to traverse the mode list to get the fixed
+	 * lvds panel mode again as we don't know whether some new modes
+	 * are added for the LVDS output device
+	 */
+	j = 0;
+	for (i = 0; i < koutput->count_modes; i++) {
+		mode_ptr = &koutput->modes[i];
+		if ((mode_ptr->hdisplay == p_lvds->hdisplay) &&
+			(mode_ptr->vdisplay == p_lvds->vdisplay)) {
+			/* find the fixed panel mode */
+			j = i;
+			break;
+		}
+	}
+	pmode = xnfalloc(sizeof(DisplayModeRec));
+	drmmode_ConvertFromKMode(output->scrn, &koutput->modes[j], pmode);
+	/*support DPM, instead of DPMS*/
+	edid_mon->features.dpms |= 0x1;
+	/*defaultly support RGB color display*/
+	edid_mon->features.display_type |= 0x1;
+	/*defaultly display support continuous-freqencey*/
+	edid_mon->features.msc |= 0x1;
+	/*defaultly  the EDID version is 1.4 */
+	edid_mon->ver.version = 1;
+	edid_mon->ver.revision = 4;
+	det_mon = edid_mon->det_mon;
+	if (pmode) {
+		/* now we construct new EDID monitor,
+		 * so filled one detailed timing block
+		 */
+                fill_detailed_lvds_block(det_mon, pmode);
+		/* the filed timing block should be set preferred*/
+		edid_mon->features.msc |= 0x2;
+		det_mon = det_mon + 1;
+	}
+	/* Set wide sync ranges so we get all modes
+	 * handed to valid_mode for checking
+	 */
+	det_mon->type = DS_RANGES;
+	det_mon->section.ranges.min_v = 0;
+	det_mon->section.ranges.max_v = 200;
+	det_mon->section.ranges.min_h = 0;
+	det_mon->section.ranges.max_h = 200;
+	output->MonInfo = edid_mon;
+	return 0;
+}
+
 static DisplayModePtr
 drmmode_output_get_modes(xf86OutputPtr output)
 {
@@ -555,6 +682,7 @@
 		if (!p_lvds->hdisplay || !p_lvds->vdisplay)
 			xf86DrvMsg(output->scrn->scrnIndex, X_ERROR,
 				"Incorrect KMS mode.\n");
+		drmmode_output_lvds_edid(output, p_lvds);
 	}
 	return Modes;
 }