[PATCH 3/3] Support exa screen color depth 30 on Linux 3.16 and later.

[Mario Kleiner <mario.kleiner.de-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Linux 3.16's radeon-kms introduced 10 bpc fb support.
Currently, as of X-Server 1.19, this works with exa accel,
but not yet when using glamor acceleration.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
---
 man/radeon.man   |  3 ++-
 src/radeon_kms.c | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/man/radeon.man b/man/radeon.man
index f4441c4..d888ac0 100644
--- a/man/radeon.man
+++ b/man/radeon.man
@@ -18,7 +18,8 @@ following features:
 .PD 0
 .TP 2
 \(bu
-Full support for 8-, 15-, 16- and 24-bit pixel depths;
+Full support for 8-, 15-, 16- and 24-bit pixel depths, and for 30-bit depth on Linux 3.16
+and later with exa acceleration;
 .TP
 \(bu
 RandR 1.2 and RandR 1.3 support;
diff --git a/src/radeon_kms.c b/src/radeon_kms.c
index a9300d4..296bc6c 100644
--- a/src/radeon_kms.c
+++ b/src/radeon_kms.c
@@ -1248,6 +1248,7 @@ static Bool RADEONPreInitVisual(ScrnInfoPtr pScrn)
     case 15:
     case 16:
     case 24:
+    case 30:
 	break;
 
     default:
@@ -1763,6 +1764,22 @@ Bool RADEONPreInit_KMS(ScrnInfoPtr pScrn, int flags)
 
     if (!RADEONPreInitAccel_KMS(pScrn))              goto fail;
 
+    /* Depth 30 only supported since Linux 3.16 / kms driver minor version 39 */
+    if ((pScrn->depth == 30) && (info->dri2.pKernelDRMVersion->version_minor < 39)) {
+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+		   "Given depth (%d) is not supported. Kernel too old. Needs Linux 3.16+\n",
+		   pScrn->depth);
+	goto fail;
+    }
+
+    /* Depth 30 not yet supported under glamor. */
+    if ((pScrn->depth == 30) && info->use_glamor) {
+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+		   "Given depth (%d) is not supported under glamor accel. Select exa.\n",
+		   pScrn->depth);
+	goto fail;
+    }
+
     radeon_drm_queue_init();
 
     info->allowColorTiling2D = FALSE;
-- 
2.7.4

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