linux-kernel - [PATCH 5.11 160/210] drm/msm: a6xx: fix version check for the A650 SQE microcode

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Message-Id: <20210412084021.346978935@linuxfoundation.org>
Date:   Mon, 12 Apr 2021 10:41:05 +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, Akhil P Oommen <akhilpo@...eaurora.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 160/210] drm/msm: a6xx: fix version check for the A650 SQE microcode

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

[ Upstream commit 6ddbfa1f5adbd5dea14ff66778ca58257f09f17d ]

I suppose the microcode version check for a650 is incorrect. It checks
for the version 1.95, while the firmware released have major version of 0:
0.91 (vulnerable), 0.99 (fixing the issue).

Lower version requirements to accept firmware 0.99.

Fixes: 8490f02a3ca4 ("drm/msm: a6xx: Make sure the SQE microcode is safe")
Cc: Akhil P Oommen <akhilpo@...eaurora.org>
Cc: Jordan Crouse <jcrouse@...eaurora.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Acked-by: Jordan Crouse <jordan@...micpenguin.net>
Message-Id: <20210331140223.3771449-1-dmitry.baryshkov@...aro.org>
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index e7a8442b59af..a676811ef69d 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -566,17 +566,17 @@ static bool a6xx_ucode_check_version(struct a6xx_gpu *a6xx_gpu,
 	}  else {
 		/*
 		 * a650 tier targets don't need whereami but still need to be
-		 * equal to or newer than 1.95 for other security fixes
+		 * equal to or newer than 0.95 for other security fixes
 		 */
 		if (adreno_is_a650(adreno_gpu)) {
-			if ((buf[0] & 0xfff) >= 0x195) {
+			if ((buf[0] & 0xfff) >= 0x095) {
 				ret = true;
 				goto out;
 			}
 
 			DRM_DEV_ERROR(&gpu->pdev->dev,
 				"a650 SQE ucode is too old. Have version %x need at least %x\n",
-				buf[0] & 0xfff, 0x195);
+				buf[0] & 0xfff, 0x095);
 		}
 
 		/*
-- 
2.30.2