linux-kernel - [PATCH v3 5/7] drm/msm/a5xx: Fix VPC protect value in gpu

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Message-Id: <20210113183339.446239-6-angelogioacchino.delregno@somainline.org>
Date:   Wed, 13 Jan 2021 19:33:37 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     robdclark@...il.com
Cc:     sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        jcrouse@...eaurora.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Subject: [PATCH v3 5/7] drm/msm/a5xx: Fix VPC protect value in gpu_write()

From: Konrad Dybcio <konrad.dybcio@...ainline.org>

The upstream API for some reason uses logbase2 instead of
just passing the argument as-is, whereas downstream CAF
kernel does the latter.

Hence, a mistake has been made when porting:
4 is the value that's supposed to be passed, but
log2(4) = 2. Changing the value to 16 (= 2^4) fixes
the issue.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 66980f4cd93e..24ab51bb5a01 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -821,7 +821,7 @@ static int a5xx_hw_init(struct msm_gpu *gpu)
 
 	/* VPC */
 	gpu_write(gpu, REG_A5XX_CP_PROTECT(14), ADRENO_PROTECT_RW(0xE68, 8));
-	gpu_write(gpu, REG_A5XX_CP_PROTECT(15), ADRENO_PROTECT_RW(0xE70, 4));
+	gpu_write(gpu, REG_A5XX_CP_PROTECT(15), ADRENO_PROTECT_RW(0xE70, 16));
 
 	/* UCHE */
 	gpu_write(gpu, REG_A5XX_CP_PROTECT(16), ADRENO_PROTECT_RW(0xE80, 16));
-- 
2.29.2