drm: flip cirrus driver status to "obsolete".

Also update Kconfig help text, explaining things:

Cirrus is obsolete, the hardware was designed in the 90ies
and can't keep up with todays needs.  More background:
https://www.kraxel.org/blog/2014/10/qemu-using-cirrus-considered-harmful/

Better alternatives are:
  - stdvga (DRM_BOCHS, qemu -vga std, default in qemu 2.2+)
  - qxl (DRM_QXL, qemu -vga qxl, works best with spice)
  - virtio (VIRTIO_GPU), qemu -vga virtio)

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

2 files changed, 11 insertions, 1 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 15eadc8c58c9..b8e2bbe621a3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4116,7 +4116,8 @@ M:	Dave Airlie <airlied@redhat.com>
 M:      Gerd Hoffmann <kraxel@redhat.com>
 L:      virtualization@lists.linux-foundation.org
 T:      git git://git.kraxel.org/linux drm-qemu
-S:      Odd Fixes
+S:      Obsolete
+W:      https://www.kraxel.org/blog/2014/10/qemu-using-cirrus-considered-harmful/
 F:      drivers/gpu/drm/cirrus/
 
 RADEON and AMDGPU DRM DRIVERS
diff --git a/drivers/gpu/drm/cirrus/Kconfig b/drivers/gpu/drm/cirrus/Kconfig
index 04b3c161dfae..7f4cc6e172ab 100644
--- a/drivers/gpu/drm/cirrus/Kconfig
+++ b/drivers/gpu/drm/cirrus/Kconfig
@@ -7,3 +7,12 @@ config DRM_CIRRUS_QEMU
          This is a KMS driver for emulated cirrus device in qemu.
          It is *NOT* intended for real cirrus devices. This requires
          the modesetting userspace X.org driver.
+
+         Cirrus is obsolete, the hardware was designed in the 90ies
+         and can't keep up with todays needs.  More background:
+         https://www.kraxel.org/blog/2014/10/qemu-using-cirrus-considered-harmful/
+
+         Better alternatives are:
+           - stdvga (DRM_BOCHS, qemu -vga std, default in qemu 2.2+)
+           - qxl (DRM_QXL, qemu -vga qxl, works best with spice)
+           - virtio (DRM_VIRTIO_GPU), qemu -vga virtio)