HDMI bpp support, and MAXEDID is written 256.

1 files changed, 32 insertions, 2 deletions

diff --git a/testedid.c b/testedid.c
index 5bb0612..1e378a3 100644
--- a/testedid.c
+++ b/testedid.c
@@ -15,9 +15,11 @@
 #define EDIDPATH "/sys/class/drm/"
 #define MAXCARD 10
 #define MAXFILENAME 256
-#define MAXEDID 128
+#define MAXEDID 256
 
 #include "drm_edid.h"
+//int MAXEDID = 128;
+
 int getcardlist(struct dirent *cardlist[])
 {
 	DIR* dp;   
@@ -137,6 +139,17 @@ void finddmtmode(struct modeinfo* m,struct modeline* rmode)
         }
     }
 }
+int gethdmiblock(char edid[])
+{
+    for(int i=0;i<MAXEDID;i++)
+    {
+        if(edid[i] == 0x03 &&  edid[i+1] == 0x0c && edid[i+2] == 0)
+        {
+	    return i;
+        }
+    }
+    return -1;
+}
 void analizeedid(char edid[])
 {
     char head[]={0x0,0xff,0xff,0xff,0xff,0xff,0xff,0x0};
@@ -424,8 +437,25 @@ void analizeedid(char edid[])
        // printf("VSync: %d\n",sync.value); 
        
     }
-
+//////////////////////
+//HDMI 
+    int phdmiindex = gethdmiblock(edid);
+    if(phdmiindex != -1)
+    {
+        printf("having a hdmi block, start position is:%2hhx\n",phdmiindex);
+        char *bppinfo[]={ "DVI_Dual" , "", "", "DC_Y444", "DC_30bit", "DC_36bit", "DC_48bit", "Supports_AI"};
+        char bppbyte=edid[phdmiindex + 5];
+        for(int i=0;i<8;i++)
+        {
+            if(bppbyte & 0x01) 
+            {    
+                printf("HDMI bpp supports: %s\n",bppinfo[i]);
+            }
+            bppbyte = bppbyte >> 1;
+        }
+    }
 }
+
 int  main(void)   
 {   
     struct dirent *cardlist[MAXCARD];