The BIOS shouldn't be touching this memory across suspend/resume, so
just leave it alone. This saves us ~50ms on resume on my T420.
Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_drv.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 824e3c8..95e2b8b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -119,6 +119,10 @@ module_param_named(i915_enable_ppgtt, i915_enable_ppgtt, int, 0600);
MODULE_PARM_DESC(i915_enable_ppgtt,
"Enable PPGTT (default: true)");
+int i915_needs_gtt_restore __read_mostly = 0;
+module_param_named(gtt_restore, i915_needs_gtt_restore, int, 0600);
+MODULE_PARM_DESC(gtt_restore, "Rewrite GTT on resume (default: false)");
+
static struct drm_driver driver;
extern int intel_agp_enabled;
@@ -537,7 +541,8 @@ static int i915_drm_thaw(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
int error = 0;
- if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ if (drm_core_check_feature(dev, DRIVER_MODESET) &&
+ i915_needs_gtt_restore) {
mutex_lock(&dev->struct_mutex);
i915_gem_restore_gtt_mappings(dev);
mutex_unlock(&dev->struct_mutex);
--
1.7.9.5
