linux-kernel - [PATCH 2/6] drm/msm/a6xx: Skip empty protection ranges entries

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230517-topic-a7xx_prep-v1-2-7a964f2e99c2@linaro.org>
Date:   Wed, 17 May 2023 18:50:09 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 2/6] drm/msm/a6xx: Skip empty protection ranges entries

Some specific SKUs leave certain protection range registers empty.
Allow for that behavior.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index deed42675fe2..8707e8b6ac7e 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -778,8 +778,11 @@ static void a6xx_set_cp_protect(struct msm_gpu *gpu)
 	 */
 	gpu_write(gpu, REG_A6XX_CP_PROTECT_CNTL, BIT(0) | BIT(1) | BIT(3));
 
-	for (i = 0; i < count - 1; i++)
-		gpu_write(gpu, REG_A6XX_CP_PROTECT(i), regs[i]);
+	for (i = 0; i < count - 1; i++) {
+		/* Intentionally skip writing to some registers */
+		if (regs[i])
+			gpu_write(gpu, REG_A6XX_CP_PROTECT(i), regs[i]);
+	}
 	/* last CP_PROTECT to have "infinite" length on the last entry */
 	gpu_write(gpu, REG_A6XX_CP_PROTECT(count_max - 1), regs[i]);
 }

-- 
2.40.1