From 294b9692e6d3a1e2ddeaa4dacf2006b243efaa8e Mon Sep 17 00:00:00 2001
From: Matt Roper <matthew.d.roper@intel.com>
Date: Tue, 16 Nov 2021 09:48:15 -0800
Subject: drm/i915/dg2: Add Wa_14010547955
Git-commit: 7cbea1b61788c05a5bcb84c73ed5ed90bb2e0a93
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
This workaround is documented a bit strangely in the bspec; it's listed
as an A0 workaround, but the description clarifies that the workaround
is implicitly handled by the hardware and what the driver really needs
to do is program a chicken bit to reenable some internal behavior.
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211116174818.2128062-3-matthew.d.roper@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/display/intel_display.c | 4 ++++
drivers/gpu/drm/i915/i915_reg.h | 5 +++--
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 7f2030942b96..aebb41195c41 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -991,6 +991,10 @@ static void icl_set_pipe_chicken(const struct intel_crtc_state *crtc_state)
else if (DISPLAY_VER(dev_priv) >= 13)
tmp |= UNDERRUN_RECOVERY_DISABLE_ADLP;
+ /* Wa_14010547955:dg2 */
+ if (IS_DG2_DISPLAY_STEP(dev_priv, STEP_B0, STEP_FOREVER))
+ tmp |= DG2_RENDER_CCSTAG_4_3_EN;
+
intel_de_write(dev_priv, PIPE_CHICKEN(pipe), tmp);
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3450818802c2..05d35b6fdcee 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8573,8 +8573,9 @@ enum {
_PIPEB_CHICKEN)
#define UNDERRUN_RECOVERY_DISABLE_ADLP REG_BIT(30)
#define UNDERRUN_RECOVERY_ENABLE_DG2 REG_BIT(30)
-#define PIXEL_ROUNDING_TRUNC_FB_PASSTHRU (1 << 15)
-#define PER_PIXEL_ALPHA_BYPASS_EN (1 << 7)
+#define PIXEL_ROUNDING_TRUNC_FB_PASSTHRU REG_BIT(15)
+#define DG2_RENDER_CCSTAG_4_3_EN REG_BIT(12)
+#define PER_PIXEL_ALPHA_BYPASS_EN REG_BIT(7)
#define VFLSKPD _MMIO(0x62a8)
#define DIS_OVER_FETCH_CACHE REG_BIT(1)
--
2.38.1