radeon: add support for Custom EDID

Allows you to specify an edid per output from a file
to override what is detected by DDC.  Useful for
problematic monitors or KVM switches that block
DDC.  Specifying an EDID that is not compatible with
your monitor could damage your monitor so use with
caution.

agd5f: cache the custom edid at startup so we don't
have to read it from file every time the output is
queried.

1 files changed, 60 insertions, 1 deletions

diff --git a/src/radeon_output.c b/src/radeon_output.c
index 30f6f3b0..36ef1aad 100644
--- a/src/radeon_output.c
+++ b/src/radeon_output.c
@@ -32,6 +32,7 @@
 
 #include <string.h>
 #include <stdio.h>
+#include <fcntl.h>
 
 /* X and server generic header files */
 #include "xf86.h"
@@ -215,6 +216,60 @@ monitor_is_digital(xf86MonPtr MonInfo)
     return (MonInfo->rawData[0x14] & 0x80) != 0;
 }
 
+static void
+RADEONGetHardCodedEDIDFromFile(xf86OutputPtr output)
+{
+    ScrnInfoPtr pScrn = output->scrn;
+    RADEONInfoPtr info = RADEONPTR(pScrn);
+    RADEONOutputPrivatePtr radeon_output = output->driver_private;
+    char *EDIDlist = (char *)xf86GetOptValString(info->Options, OPTION_CUSTOM_EDID);
+
+    radeon_output->custom_edid = FALSE;
+    radeon_output->custom_mon = NULL;
+
+    if (EDIDlist != NULL) {
+	unsigned char edid[128];
+	char *name = output->name;
+	char *outputEDID = strstr(EDIDlist, name);
+
+	if (outputEDID != NULL) {
+	    char *end;
+	    int fd;
+
+	    outputEDID += strlen(name) + 1;
+	    end = strstr(outputEDID, ";");
+	    if (end != NULL)
+		*end = 0;
+
+	    fd = open (outputEDID, O_RDONLY);
+	    if (fd >= 0) {
+		read(fd, edid, 128);
+		close(fd);
+		if (edid[1] == 0xff) {
+		    radeon_output->custom_mon = xf86InterpretEDID(output->scrn->scrnIndex, edid);
+		    radeon_output->custom_edid = TRUE;
+		    xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+			       "Successfully read Custom EDID data for output %s from %s.\n",
+			       name, outputEDID);
+		} else {
+		    xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
+			       "Custom EDID data for %s read from %s was invalid.\n",
+			       name, outputEDID);
+		}
+	    } else {
+		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
+			   "Could not read custom EDID for output %s from file %s.\n",
+			   name, outputEDID);
+	    }
+	} else {
+	    xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
+		       "Could not find EDID file name for output %s; using auto detection.\n",
+		       name);
+	}
+    }
+}
+
+
 static RADEONMonitorType
 radeon_ddc_connected(xf86OutputPtr output)
 {
@@ -224,7 +279,10 @@ radeon_ddc_connected(xf86OutputPtr output)
     xf86MonPtr MonInfo = NULL;
     RADEONOutputPrivatePtr radeon_output = output->driver_private;
 
-    if (radeon_output->pI2CBus) {
+    if (radeon_output->custom_edid) {
+	MonInfo = xnfcalloc(sizeof(xf86Monitor), 1);
+	*MonInfo = *radeon_output->custom_mon;
+    } else if (radeon_output->pI2CBus) {
 	if (info->get_hardcoded_edid_from_bios)
 	    MonInfo = RADEONGetHardCodedEDIDFromBIOS(output);
 	if (MonInfo == NULL) {
@@ -2802,6 +2860,7 @@ Bool RADEONSetupConnectors(ScrnInfoPtr pScrn)
 	xf86OutputPtr output = xf86_config->output[i];
 
 	output->possible_clones = radeon_output_clones(pScrn, output);
+	RADEONGetHardCodedEDIDFromFile(output);
     }
 
     return TRUE;