[Mesa-dev] [PATCH] i965: Require Kernel 3.6 for Gen4-5 platforms.

[Kenneth Graunke]

We've already required Kernel 3.6 on Gen6+ since Mesa 9.2 (May 2013,
commit 92d2f5acfadea672417b6785710c9e8b7f605e41).  It seems reasonable
to require it for Gen4-5 as well, bumping the requirement from 2.6.39.

This is necessary for glClientWaitSync with a timeout to work, which
is a feature we expose on Gen4-5.  Without it, we would fall back to an
infinite wait, which is pretty bad.

See kernel commit 172cf15d18889313bf2c3bfb81fcea08369274ef in 3.6+.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_context.c  | 2 +-
 src/mesa/drivers/dri/i965/intel_screen.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 648ae508145..e4e8b30c9f0 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -1094,7 +1094,7 @@ brwCreateContext(gl_api api,
       brw->hw_ctx = drm_intel_gem_context_create(brw->bufmgr);
 
       if (!brw->hw_ctx) {
-         fprintf(stderr, "Gen6+ requires Kernel 3.6 or later.\n");
+         fprintf(stderr, "Failed to create hardware context.\n");
          intelDestroyContext(driContextPriv);
          return false;
       }
diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index a35cf69eede..2c5e502e5ef 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1273,8 +1273,8 @@ intel_init_bufmgr(struct intel_screen *screen)
 
    drm_intel_bufmgr_gem_enable_fenced_relocs(screen->bufmgr);
 
-   if (!intel_get_boolean(screen, I915_PARAM_HAS_RELAXED_DELTA)) {
-      fprintf(stderr, "[%s: %u] Kernel 2.6.39 required.\n", __func__, __LINE__);
+   if (!intel_get_boolean(screen, I915_PARAM_HAS_WAIT_TIMEOUT)) {
+      fprintf(stderr, "[%s: %u] Kernel 3.6 required.\n", __func__, __LINE__);
       return false;
    }
 
-- 
2.12.0