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Subject: edid-decode: the AMD VSDB minor version is really a caps field
Author: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Date: Sat Oct 12 10:01:21 2024 +0200
This kernel commit:
ec8e59cb4e0c ("drm/amd/display: Get replay info from VSDB")
gives a bit of insight into the AMD VSDB. Specifically, the first
byte is the version and the second byte is a Feature Caps byte.
Only one capability was described in that commit, so I added that.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
parse-cta-block.cpp | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/parse-cta-block.cpp b/parse-cta-block.cpp
index f193b568a6d0..06bc07d30b0f 100644
--- a/parse-cta-block.cpp
+++ b/parse-cta-block.cpp
@@ -1556,7 +1556,14 @@ static void cta_amd(const unsigned char *x, unsigned
length)
{
// These Freesync values are reversed engineered by looking
// at existing EDIDs.
- printf(" Version: %u.%u\n", x[0], x[1]);
+ printf(" Version: %u\n", x[0]);
+
+ // Obtained from:
+ //
https://github.com/torvalds/linux/commit/ec8e59cb4e0c1a52d5a541fff9dcec398b48f7b4
+ printf(" Feature Caps: 0x%02x\n", x[1]);
+ if (x[1] & 0x40)
+ printf(" Replay Supported\n");
+
printf(" Minimum Refresh Rate: %u Hz\n", x[2]);
printf(" Maximum Refresh Rate: %u Hz\n", x[3]);
// Freesync 1.x flags
