From 2878ebbfd32da056670f44f185374ae87c4f87d8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 28 Feb 2020 22:35:52 +0200
Subject: drm/i915: Implement display w/a 1140 for glk/cnl
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Git-commit: c834d03cca61bf88aa8c2f9524360cce484686ac
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
Display w/a #1140 tells us we have to program the transition
watermark to the minimum value on glk/cnl. Let's do that.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228203552.30273-4-ville.syrjala@linux.intel.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/intel_pm.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3501c33e75a8..8375054ba27d 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5120,8 +5120,7 @@ static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
{
struct drm_device *dev = crtc_state->uapi.crtc->dev;
const struct drm_i915_private *dev_priv = to_i915(dev);
- u16 trans_min, trans_y_tile_min;
- const u16 trans_amount = 10; /* This is configurable amount */
+ u16 trans_min, trans_amount, trans_y_tile_min;
u16 wm0_sel_res_b, trans_offset_b, res_blocks;
/* Transition WM don't make any sense if ipc is disabled */
@@ -5135,9 +5134,16 @@ static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
if (IS_GEN9_BC(dev_priv) || IS_BROXTON(dev_priv))
return;
- trans_min = 14;
if (INTEL_GEN(dev_priv) >= 11)
trans_min = 4;
+ else
+ trans_min = 14;
+
+ /* Display WA #1140: glk,cnl */
+ if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
+ trans_amount = 0;
+ else
+ trans_amount = 10; /* This is configurable amount */
trans_offset_b = trans_min + trans_amount;
@@ -5164,7 +5170,6 @@ static void skl_compute_transition_wm(const struct intel_crtc_state *crtc_state,
/* WA BUG:1938466 add one block for non y-tile planes */
if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_A0))
res_blocks += 1;
-
}
/*
--
2.28.0