Mesa (staging/21.2): panfrost: Detect implementations support AFBC

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Module: Mesa
Branch: staging/21.2
Commit: f80f983226a800e3a82976420e4070645ea1dd8a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f80f983226a800e3a82976420e4070645ea1dd8a

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Tue Oct  5 16:01:00 2021 -0400

panfrost: Detect implementations support AFBC

AFBC is an optional feature on Bifrost. If it is missing, a bit will be
set in the poorly named AFBC_FEATURES register. Check this so we can act
appropriately.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13497>
(cherry picked from commit 3e168b97cc7d38e757fa5cd51ecd25c18d84daf6)

---

 .pick_status.json             |  2 +-
 src/panfrost/lib/pan_device.h |  1 +
 src/panfrost/lib/pan_props.c  | 14 ++++++++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/.pick_status.json b/.pick_status.json
index 54c27586e84..c4a535ad8a6 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -121,7 +121,7 @@
         "description": "panfrost: Detect implementations support AFBC",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null
     },
diff --git a/src/panfrost/lib/pan_device.h b/src/panfrost/lib/pan_device.h
index 699449c0a55..7c2e9135677 100644
--- a/src/panfrost/lib/pan_device.h
+++ b/src/panfrost/lib/pan_device.h
@@ -157,6 +157,7 @@ struct panfrost_device {
         unsigned thread_tls_alloc;
         struct panfrost_tiler_features tiler_features;
         unsigned quirks;
+        bool has_afbc;
 
         /* Table of formats, indexed by a PIPE format */
         const struct panfrost_format *formats;
diff --git a/src/panfrost/lib/pan_props.c b/src/panfrost/lib/pan_props.c
index 08596cb3906..8afe44e461a 100644
--- a/src/panfrost/lib/pan_props.c
+++ b/src/panfrost/lib/pan_props.c
@@ -237,6 +237,19 @@ panfrost_model_name(unsigned gpu_id)
         }
 }
 
+/* Check for AFBC hardware support. AFBC is introduced in v5. Implementations
+ * may omit it, signaled as a nonzero value in the AFBC_FEATURES property. */
+
+static bool
+panfrost_query_afbc(int fd, unsigned arch)
+{
+        unsigned reg = panfrost_query_raw(fd,
+                                          DRM_PANFROST_PARAM_AFBC_FEATURES,
+                                          false, 0);
+
+        return (arch >= 5) && (reg == 0);
+}
+
 void
 panfrost_open_device(void *memctx, int fd, struct panfrost_device *dev)
 {
@@ -251,6 +264,7 @@ panfrost_open_device(void *memctx, int fd, struct panfrost_device *dev)
         dev->quirks = panfrost_get_quirks(dev->gpu_id, revision);
         dev->compressed_formats = panfrost_query_compressed_formats(fd);
         dev->tiler_features = panfrost_query_tiler_features(fd);
+        dev->has_afbc = panfrost_query_afbc(fd, dev->arch);
 
         if (dev->quirks & HAS_SWIZZLES)
                 dev->formats = panfrost_pipe_format_v6;