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From:   Steven Price <steven.price@arm.com>
To:     Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
        Rob Herring <robh@kernel.org>,
        Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc:     Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        "Marty E. Plummer" <hanetzer@startmail.com>,
        Eric Anholt <eric@anholt.net>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Steven Price <steven.price@arm.com>
Subject: [PATCH] drm/panfrost: Ensure GPU quirks are always initialised
Date:   Wed,  9 Sep 2020 13:29:57 +0100
Message-Id: <20200909122957.51667-1-steven.price@arm.com>
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Sender: linux-kernel-owner@vger.kernel.org
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The GPU 'CONFIG' registers used to work around hardware issues are
cleared on reset so need to be programmed every time the GPU is reset.
However panfrost_device_reset() failed to do this.

To avoid this in future instead move the call to
panfrost_gpu_init_quirks() to panfrost_gpu_power_on() so that the
regsiters are always programmed just before the cores are powered.

Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver")
Signed-off-by: Steven Price <steven.price@arm.com>
---
 drivers/gpu/drm/panfrost/panfrost_gpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index e0f190e43813..6d17d3cbd1df 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -305,6 +305,8 @@ void panfrost_gpu_power_on(struct panfrost_device *pfdev)
 	int ret;
 	u32 val;
 
+	panfrost_gpu_init_quirks(pfdev);
+
 	/* Just turn on everything for now */
 	gpu_write(pfdev, L2_PWRON_LO, pfdev->features.l2_present);
 	ret = readl_relaxed_poll_timeout(pfdev->iomem + L2_READY_LO,
@@ -356,7 +358,6 @@ int panfrost_gpu_init(struct panfrost_device *pfdev)
 		return err;
 	}
 
-	panfrost_gpu_init_quirks(pfdev);
 	panfrost_gpu_power_on(pfdev);
 
 	return 0;
-- 
2.20.1