[Mesa-dev] [PATCH V2] i965/icl: Set Enabled Texel Offset Precision Fix bit

[Anuj Phogat]

h/w specification requires this bit to be always set.

V2: Fix bit mask (Chris Wilson)

Suggested-by: Kenneth Graunke <kenneth at whitecape.org>
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
 src/mesa/drivers/dri/i965/brw_defines.h      | 4 ++++
 src/mesa/drivers/dri/i965/brw_state_upload.c | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index 433314115b1..97a787a2ab3 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -1673,6 +1673,10 @@ enum brw_pixel_shader_coverage_mask_mode {
 # define GLK_SCEC_BARRIER_MODE_3D_HULL     (1 << 7)
 # define GLK_SCEC_BARRIER_MODE_MASK        REG_MASK(1 << 7)
 
+#define HALF_SLICE_CHICKEN7                0xE194
+# define TEXEL_OFFSET_FIX_ENABLE           (1 << 1)
+# define TEXEL_OFFSET_FIX_MASK             REG_MASK(1 << 1)
+
 #define GEN11_SAMPLER_MODE                                  0xE18C
 # define HEADERLESS_MESSAGE_FOR_PREEMPTABLE_CONTEXTS        (1 << 5)
 # define HEADERLESS_MESSAGE_FOR_PREEMPTABLE_CONTEXTS_MASK   REG_MASK(1 << 5)
diff --git a/src/mesa/drivers/dri/i965/brw_state_upload.c b/src/mesa/drivers/dri/i965/brw_state_upload.c
index 2af4c45bc44..7f20579fb87 100644
--- a/src/mesa/drivers/dri/i965/brw_state_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_state_upload.c
@@ -72,6 +72,13 @@ brw_upload_initial_gpu_state(struct brw_context *brw)
       brw_load_register_imm32(brw, GEN11_SAMPLER_MODE,
                               HEADERLESS_MESSAGE_FOR_PREEMPTABLE_CONTEXTS_MASK |
                               HEADERLESS_MESSAGE_FOR_PREEMPTABLE_CONTEXTS);
+
+      /* Bit 1 "Enabled Texel Offset Precision Fix" must be set in
+       * HALF_SLICE_CHICKEN7 register.
+       */
+      brw_load_register_imm32(brw, HALF_SLICE_CHICKEN7,
+                              TEXEL_OFFSET_FIX_MASK |
+                              TEXEL_OFFSET_FIX_ENABLE);
    }
 
    if (devinfo->gen == 10 || devinfo->gen == 11) {
-- 
2.17.1