linux-kernel - [PATCH v2 3/6] drm/msm/a6xx: Skip empty protection ranges entries

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Message-Id: <20230517-topic-a7xx_prep-v2-3-5b9daa2b2cf0@linaro.org>
Date:   Fri, 19 May 2023 15:29:08 +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>,
        Jonathan Marek <jonathan@...ek.ca>,
        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 v2 3/6] 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