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From:   gregkh@linuxfoundation.org
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@somainline.org>,
        Jordan Crouse <jcrouse@codeaurora.org>,
        Rob Clark <robdclark@chromium.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 38/39] drm/msm/a5xx: Remove overwriting A5XX_PC_DBG_ECO_CNTL register
Date:   Wed, 10 Mar 2021 14:24:46 +0100
Message-Id: <20210310132320.896041128@linuxfoundation.org>
In-Reply-To: <20210310132319.708237392@linuxfoundation.org>
References: <20210310132319.708237392@linuxfoundation.org>
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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>

[ Upstream commit 8f03c30cb814213e36032084a01f49a9e604a3e3 ]

The PC_DBG_ECO_CNTL register on the Adreno A5xx family gets
programmed to some different values on a per-model basis.
At least, this is what we intend to do here;

Unfortunately, though, this register is being overwritten with a
static magic number, right after applying the GPU-specific
configuration (including the GPU-specific quirks) and that is
effectively nullifying the efforts.

Let's remove the redundant and wrong write to the PC_DBG_ECO_CNTL
register in order to retain the wanted configuration for the
target GPU.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index d29a58bd2f7a..776bbe9775e9 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -681,8 +681,6 @@ static int a5xx_hw_init(struct msm_gpu *gpu)
 	if (adreno_gpu->info->quirks & ADRENO_QUIRK_TWO_PASS_USE_WFI)
 		gpu_rmw(gpu, REG_A5XX_PC_DBG_ECO_CNTL, 0, (1 << 8));
 
-	gpu_write(gpu, REG_A5XX_PC_DBG_ECO_CNTL, 0xc0200100);
-
 	/* Enable USE_RETENTION_FLOPS */
 	gpu_write(gpu, REG_A5XX_CP_CHICKEN_DBG, 0x02000000);
 
-- 
2.30.1