[Intel-gfx] [PATCH 2/2] drm/i915: Enable render context support for gen4 (Broadwater to Cantiga)

[Chris Wilson]

Broadwater and the rest of gen4  do support being able to saving and
reloading context specific registers between contexts, providing isolation
of the basic GPU state (as programmable by userspace). This allows
userspace to assume that the GPU retains their state from one batch to the
next, minimising the amount of state it needs to reload and manually save
across batches.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Kenneth Graunke <kenneth at whitecape.org>
---
 drivers/gpu/drm/i915/intel_engine_cs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index f89b8f199e3f..88109e0de051 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -219,6 +219,7 @@ __intel_engine_context_size(struct drm_i915_private *dev_priv, u8 class)
 			return round_up(GEN6_CXT_TOTAL_SIZE(cxt_size) * 64,
 					PAGE_SIZE);
 		case 5:
+		case 4:
 			/*
 			 * There is a discrepancy here between the size reported
 			 * by the register and the size of the context layout
@@ -235,7 +236,6 @@ __intel_engine_context_size(struct drm_i915_private *dev_priv, u8 class)
 					 cxt_size * 64,
 					 cxt_size - 1);
 			return round_up(cxt_size * 64, PAGE_SIZE);
-		case 4:
 		case 3:
 		case 2:
 		/* For the special day when i810 gets merged. */
-- 
2.20.1