1 files changed, 88 insertions, 0 deletions

diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index 563a98b88e9..4f57485f8c5 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -973,6 +973,90 @@ void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 	DPRINTK("========================================\n");
 }
 
+/**
+ * fb_edid_add_monspecs() - add monitor video modes from E-EDID data
+ * @edid:	128 byte array with an E-EDID block
+ * @spacs:	monitor specs to be extended
+ */
+void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
+{
+	unsigned char *block;
+	struct fb_videomode *m;
+	int num = 0, i;
+	u8 svd[64], edt[(128 - 4) / DETAILED_TIMING_DESCRIPTION_SIZE];
+	u8 pos = 4, svd_n = 0;
+
+	if (!edid)
+		return;
+
+	if (!edid_checksum(edid))
+		return;
+
+	if (edid[0] != 0x2 ||
+	    edid[2] < 4 || edid[2] > 128 - DETAILED_TIMING_DESCRIPTION_SIZE)
+		return;
+
+	DPRINTK("  Short Video Descriptors\n");
+
+	while (pos < edid[2]) {
+		u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
+		pr_debug("Data block %u of %u bytes\n", type, len);
+		if (type == 2)
+			for (i = pos; i < pos + len; i++) {
+				u8 idx = edid[pos + i] & 0x7f;
+				svd[svd_n++] = idx;
+				pr_debug("N%sative mode #%d\n",
+					 edid[pos + i] & 0x80 ? "" : "on-n", idx);
+			}
+		pos += len + 1;
+	}
+
+	block = edid + edid[2];
+
+	DPRINTK("  Extended Detailed Timings\n");
+
+	for (i = 0; i < (128 - edid[2]) / DETAILED_TIMING_DESCRIPTION_SIZE;
+	     i++, block += DETAILED_TIMING_DESCRIPTION_SIZE)
+		if (PIXEL_CLOCK)
+			edt[num++] = block - edid;
+
+	/* Yikes, EDID data is totally useless */
+	if (!(num + svd_n))
+		return;
+
+	m = kzalloc((specs->modedb_len + num + svd_n) *
+		       sizeof(struct fb_videomode), GFP_KERNEL);
+
+	if (!m)
+		return;
+
+	memcpy(m, specs->modedb, specs->modedb_len * sizeof(struct fb_videomode));
+
+	for (i = specs->modedb_len; i < specs->modedb_len + num; i++) {
+		get_detailed_timing(edid + edt[i - specs->modedb_len], &m[i]);
+		if (i == specs->modedb_len)
+			m[i].flag |= FB_MODE_IS_FIRST;
+		pr_debug("Adding %ux%u@%u\n", m[i].xres, m[i].yres, m[i].refresh);
+	}
+
+	for (i = specs->modedb_len + num; i < specs->modedb_len + num + svd_n; i++) {
+		int idx = svd[i - specs->modedb_len - num];
+		if (!idx || idx > 63) {
+			pr_warning("Reserved SVD code %d\n", idx);
+		} else if (idx > ARRAY_SIZE(cea_modes) || !cea_modes[idx].xres) {
+			pr_warning("Unimplemented SVD code %d\n", idx);
+		} else {
+			memcpy(&m[i], cea_modes + idx, sizeof(m[i]));
+			pr_debug("Adding SVD #%d: %ux%u@%u\n", idx,
+				 m[i].xres, m[i].yres, m[i].refresh);
+		}
+	}
+
+	kfree(specs->modedb);
+	specs->modedb = m;
+	specs->modedb_len = specs->modedb_len + num + svd_n;
+}
+
 /*
  * VESA Generalized Timing Formula (GTF)
  */
@@ -1289,6 +1373,9 @@ void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 {
 	specs = NULL;
 }
+void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
+{
+}
 void fb_destroy_modedb(struct fb_videomode *modedb)
 {
 }
@@ -1396,6 +1483,7 @@ EXPORT_SYMBOL(fb_firmware_edid);
 
 EXPORT_SYMBOL(fb_parse_edid);
 EXPORT_SYMBOL(fb_edid_to_monspecs);
+EXPORT_SYMBOL(fb_edid_add_monspecs);
 EXPORT_SYMBOL(fb_get_mode);
 EXPORT_SYMBOL(fb_validate_mode);
 EXPORT_SYMBOL(fb_destroy_modedb);