From 009a9130d203d5bcc9224da143b870e90d3897c0 Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Sun, 10 May 2026 14:54:47 +0200
Subject: [PATCH] drivers/graphics: Report DRM_CAP_DUMB_PREFERRED_DEPTH to
 clients

---
 drivers/graphics/ihdgd/src/device/scheme.rs | 4 +++-
 drivers/graphics/vesad/src/scheme.rs        | 4 +++-
 drivers/graphics/virtio-gpud/src/scheme.rs  | 5 +++--
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/graphics/ihdgd/src/device/scheme.rs b/drivers/graphics/ihdgd/src/device/scheme.rs
index 7a90d6933e..337314da71 100644
--- a/drivers/graphics/ihdgd/src/device/scheme.rs
+++ b/drivers/graphics/ihdgd/src/device/scheme.rs
@@ -6,7 +6,8 @@ use driver_graphics::kms::objects::{
 };
 use driver_graphics::{Buffer, CursorPlane, Damage, GraphicsAdapter};
 use drm_sys::{
-    DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFER_SHADOW, DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT,
+    DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFERRED_DEPTH, DRM_CAP_DUMB_PREFER_SHADOW,
+    DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT,
 };
 use syscall::error::EINVAL;
 
@@ -50,6 +51,7 @@ impl GraphicsAdapter for Device {
     fn get_cap(&self, cap: u32) -> syscall::Result<u64> {
         match cap {
             DRM_CAP_DUMB_BUFFER => Ok(1),
+            DRM_CAP_DUMB_PREFERRED_DEPTH => Ok(24),
             DRM_CAP_DUMB_PREFER_SHADOW => Ok(1),
             _ => Err(syscall::Error::new(EINVAL)),
         }
diff --git a/drivers/graphics/vesad/src/scheme.rs b/drivers/graphics/vesad/src/scheme.rs
index 9c9713b229..4b8b31ce83 100644
--- a/drivers/graphics/vesad/src/scheme.rs
+++ b/drivers/graphics/vesad/src/scheme.rs
@@ -7,7 +7,8 @@ use driver_graphics::kms::connector::{KmsConnectorDriver, KmsConnectorStatus};
 use driver_graphics::kms::objects::{KmsCrtc, KmsCrtcState, KmsObjectId, KmsObjects};
 use driver_graphics::{Buffer, CursorPlane, Damage, GraphicsAdapter};
 use drm_sys::{
-    DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFER_SHADOW, DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT,
+    DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFERRED_DEPTH, DRM_CAP_DUMB_PREFER_SHADOW,
+    DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT,
 };
 use syscall::{EINVAL, PAGE_SIZE};
 
@@ -61,6 +62,7 @@ impl GraphicsAdapter for FbAdapter {
     fn get_cap(&self, cap: u32) -> syscall::Result<u64> {
         match cap {
             DRM_CAP_DUMB_BUFFER => Ok(1),
+            DRM_CAP_DUMB_PREFERRED_DEPTH => Ok(24),
             DRM_CAP_DUMB_PREFER_SHADOW => Ok(0),
             _ => Err(syscall::Error::new(EINVAL)),
         }
diff --git a/drivers/graphics/virtio-gpud/src/scheme.rs b/drivers/graphics/virtio-gpud/src/scheme.rs
index 0f88a66e91..2dd07681f5 100644
--- a/drivers/graphics/virtio-gpud/src/scheme.rs
+++ b/drivers/graphics/virtio-gpud/src/scheme.rs
@@ -6,8 +6,8 @@ use driver_graphics::kms::connector::{KmsConnectorDriver, KmsConnectorStatus};
 use driver_graphics::kms::objects::{KmsCrtc, KmsCrtcState, KmsObjectId, KmsObjects};
 use driver_graphics::{Buffer as DrmBuffer, CursorPlane, Damage, GraphicsAdapter, GraphicsScheme};
 use drm_sys::{
-    DRM_CAP_CURSOR_HEIGHT, DRM_CAP_CURSOR_WIDTH, DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFER_SHADOW,
-    DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT,
+    DRM_CAP_CURSOR_HEIGHT, DRM_CAP_CURSOR_WIDTH, DRM_CAP_DUMB_BUFFER, DRM_CAP_DUMB_PREFERRED_DEPTH,
+    DRM_CAP_DUMB_PREFER_SHADOW, DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT,
 };
 
 use syscall::{EINVAL, PAGE_SIZE};
@@ -293,6 +293,7 @@ impl<'a> GraphicsAdapter for VirtGpuAdapter<'a> {
     fn get_cap(&self, cap: u32) -> syscall::Result<u64> {
         match cap {
             DRM_CAP_DUMB_BUFFER => Ok(1),
+            DRM_CAP_DUMB_PREFERRED_DEPTH => Ok(24),
             DRM_CAP_DUMB_PREFER_SHADOW => Ok(0),
             DRM_CAP_CURSOR_WIDTH => Ok(64),
             DRM_CAP_CURSOR_HEIGHT => Ok(64),