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authorAdam Jackson <ajax@redhat.com>2010-08-03 14:38:17 -0400
committerDave Airlie <airlied@redhat.com>2010-08-10 10:46:57 +1000
commit4d76a22134d5a5ad259fd667f3d2b215b7e71d10 (patch)
tree683d8df7efc2a652cc78146022a31bbab1877950
parentfb439640145df0d3af7eacb83a19d8eb0a24002a (diff)
downloadlinux-4d76a22134d5a5ad259fd667f3d2b215b7e71d10.tar.bz2
drm/edid: Add detailed block walk for CEA extensions
Signed-off-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
-rw-r--r--drivers/gpu/drm/drm_edid.c38
-rw-r--r--include/drm/drm_edid.h6
2 files changed, 43 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 3d6abde8e785..30b286ba16c4 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -685,6 +685,33 @@ EXPORT_SYMBOL(drm_mode_find_dmt);
typedef void detailed_cb(struct detailed_timing *timing, void *closure);
static void
+cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
+{
+ int i, n = 0;
+ u8 rev = ext[0x01], d = ext[0x02];
+ u8 *det_base = ext + d;
+
+ switch (rev) {
+ case 0:
+ /* can't happen */
+ return;
+ case 1:
+ /* have to infer how many blocks we have, check pixel clock */
+ for (i = 0; i < 6; i++)
+ if (det_base[18*i] || det_base[18*i+1])
+ n++;
+ break;
+ default:
+ /* explicit count */
+ n = min(ext[0x03] & 0x0f, 6);
+ break;
+ }
+
+ for (i = 0; i < n; i++)
+ cb((struct detailed_timing *)(det_base + 18 * i), closure);
+}
+
+static void
drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
{
int i;
@@ -696,7 +723,16 @@ drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
cb(&(edid->detailed_timings[i]), closure);
- /* XXX extension block walk */
+ for (i = 1; i <= raw_edid[0x7e]; i++) {
+ u8 *ext = raw_edid + (i * EDID_LENGTH);
+ switch (*ext) {
+ case CEA_EXT:
+ cea_for_each_detailed_block(ext, cb, closure);
+ break;
+ default:
+ break;
+ }
+ }
}
static void
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 39e2cc5c7e66..5881fad91faa 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -28,6 +28,12 @@
#define EDID_LENGTH 128
#define DDC_ADDR 0x50
+#define CEA_EXT 0x02
+#define VTB_EXT 0x10
+#define DI_EXT 0x40
+#define LS_EXT 0x50
+#define MI_EXT 0x60
+
struct est_timings {
u8 t1;
u8 t2;