linux-kernel - [PATCH] drm/msm/a6xx: No zap shader is not an error

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Message-Id: <20190508130726.27557-1-robdclark@gmail.com>
Date:   Wed,  8 May 2019 06:06:52 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/msm/a6xx: No zap shader is not an error

From: Rob Clark <robdclark@...omium.org>

Depending on platform firmware, a zap shader may not be required to take
the GPU out of secure mode on boot, in which case we can just write
RBBM_SECVID_TRUST_CNTL directly.  Which we *mostly* handled, but missed
clearing 'ret' resulting that hw_init() returned an error on these
devices.

Fixes: abccb9fe3267 drm/msm/a6xx: Add zap shader load
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index ec24508b9d68..e74dce474250 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -527,6 +527,7 @@ static int a6xx_hw_init(struct msm_gpu *gpu)
 		dev_warn_once(gpu->dev->dev,
 			"Zap shader not enabled - using SECVID_TRUST_CNTL instead\n");
 		gpu_write(gpu, REG_A6XX_RBBM_SECVID_TRUST_CNTL, 0x0);
+		ret = 0;
 	}
 
 out:
-- 
2.20.1