drm/i915: make rc6 module parameter read-only

BugLink: http://bugs.launchpad.net/bugs/987337

commit f57f9c167af7cb3fd315e6a8ebe194a8aea0832a upstream.

People have been getting confused and thinking this is a runtime control.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e52b705..d0f8830 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -64,7 +64,7 @@ MODULE_PARM_DESC(semaphores,
                "Use semaphores for inter-ring sync (default: -1 (use per-chip defaults))");
 
 int i915_enable_rc6 __read_mostly = -1;
-module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0600);
+module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0400);
 MODULE_PARM_DESC(i915_enable_rc6,
                "Enable power-saving render C-state 6 (default: -1 (use per-chip default)");