linux-kernel - [PATCH 5.15 075/167] drm/i915/dg2: Add Wa

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Message-Id: <20220719114703.791187066@linuxfoundation.org>
Date:   Tue, 19 Jul 2022 13:53:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bruce Chang <yu.bruce.chang@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Ramalingam C <ramalingam.c@...el.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 075/167] drm/i915/dg2: Add Wa_22011100796

From: Bruce Chang <yu.bruce.chang@...el.com>

[ Upstream commit 154cfae6158141b18d65abb0db679bb51a8294e7 ]

Whenever Full soft reset is required, reset all individual engines
first, and then do a full soft reset.

Signed-off-by: Bruce Chang <yu.bruce.chang@...el.com>
cc: Matt Roper <matthew.d.roper@...el.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Ramalingam C <ramalingam.c@...el.com>
Reviewed-by: Matthew Auld <matthew.auld@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220128185209.18077-5-ramalingam.c@intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/i915/gt/intel_reset.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 91200c43951f..b6697c1d260a 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -623,6 +623,15 @@ static int gen8_reset_engines(struct intel_gt *gt,
 		 */
 	}
 
+	/*
+	 * Wa_22011100796:dg2, whenever Full soft reset is required,
+	 * reset all individual engines firstly, and then do a full soft reset.
+	 *
+	 * This is best effort, so ignore any error from the initial reset.
+	 */
+	if (IS_DG2(gt->i915) && engine_mask == ALL_ENGINES)
+		gen11_reset_engines(gt, gt->info.engine_mask, 0);
+
 	if (GRAPHICS_VER(gt->i915) >= 11)
 		ret = gen11_reset_engines(gt, engine_mask, retry);
 	else
-- 
2.35.1