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From: Mahesh Kumar <mahesh1.kumar@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: paulo.r.zanoni@intel.com, maarten.lankhorst@intel.com
Subject: [PATCH v6 3/8] drm/i915/kbl: IPC workaround for kabylake
Date: Thu, 24 Nov 2016 09:31:30 +0530	[thread overview]
Message-ID: <20161124040135.5517-4-mahesh1.kumar@intel.com> (raw)
In-Reply-To: <20161124040135.5517-1-mahesh1.kumar@intel.com>

IPC (Isoch Priority Control) may cause underflows.

KBL WA: When IPC is enabled, watermark latency values must be increased
by 4us across all levels. This brings level 0 up to 6us.

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7090a7c..33d22cc 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3603,6 +3603,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				fb->modifier == I915_FORMAT_MOD_Yf_TILED;
 	x_tiled = fb->modifier == I915_FORMAT_MOD_X_TILED;
 
+	/* IPC WA for kabylake */
+	if (IS_KABYLAKE(dev_priv) && dev_priv->ipc_enabled)
+		latency += 4;
+
 	if (apply_memory_bw_wa && x_tiled)
 		latency += 15;
 
-- 
2.10.1

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  parent reply	other threads:[~2016-11-24  4:00 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-24  4:01 [PATCH v5 0/8] GEN-9 Arbitrated Bandwidth WM WA's & IPC Mahesh Kumar
2016-11-24  4:01 ` [PATCH v6 1/8] drm/i915/skl: Add variables to check x_tile and y_tile Mahesh Kumar
2016-11-24  4:01 ` [PATCH v6 2/8] drm/i915/bxt: IPC WA for Broxton Mahesh Kumar
2016-11-24 12:51   ` Lankhorst, Maarten
2016-11-28 13:07     ` Mahesh Kumar
2016-12-01 11:02       ` Lankhorst, Maarten
2016-11-24  4:01 ` Mahesh Kumar [this message]
2016-11-24  4:01 ` [PATCH v6 4/8] drm/i915/bxt: Enable IPC support Mahesh Kumar
2016-11-24  4:01 ` [PATCH v6 5/8] drm/i915/skl+: change WM calc to fixed point 16.16 Mahesh Kumar
2016-11-24  4:01 ` [PATCH v6 6/8] drm/i915: Add intel_atomic_get_existing_crtc_state function Mahesh Kumar
2016-11-24  4:01 ` [PATCH v6 7/8] drm/i915: Decode system memory bandwidth Mahesh Kumar
2016-11-24 10:10   ` kbuild test robot
2016-11-24  4:01 ` [PATCH v6 8/8] drm/i915/gen9: WM memory bandwidth related workaround Mahesh Kumar
2016-11-24 12:51   ` Lankhorst, Maarten
2016-11-29  5:42     ` Mahesh Kumar
2016-11-29  9:46       ` Lankhorst, Maarten
2016-11-29 13:47         ` Mahesh Kumar
2016-11-29 15:10           ` Lankhorst, Maarten
2016-11-24  4:45 ` ✓ Fi.CI.BAT: success for GEN-9 Arbitrated Bandwidth WM WA's & IPC (rev2) Patchwork

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