linux-kernel - [PATCH] drm/etnaviv: fix external abort seen on GC600 rev 0x19

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Message-Id: <20200821181731.94852-1-christian.gmeiner@gmail.com>
Date:   Fri, 21 Aug 2020 20:17:27 +0200
From:   Christian Gmeiner <christian.gmeiner@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     josua.mayer@....eu,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        stable@...r.kernel.org, Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, etnaviv@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/etnaviv: fix external abort seen on GC600 rev 0x19

It looks like that this GPU core triggers an abort when
reading VIVS_HI_CHIP_PRODUCT_ID and/or VIVS_HI_CHIP_CUSTOMER_ID.

I looked at different versions of Vivante's kernel driver and did
not found anything about this issue or what feature flag can be
used. So go the simplest route and do not read these two registers
on the affected GPU core.

Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
Reported-by: Josua Mayer <josua.mayer@....eu>
Fixes: 815e45bbd4d3 ("drm/etnaviv: determine product, customer and eco id")
Cc: stable@...r.kernel.org
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index d5a4cd85a0f6..d3906688c2b3 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -337,10 +337,17 @@ static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
 
 		gpu->identity.model = gpu_read(gpu, VIVS_HI_CHIP_MODEL);
 		gpu->identity.revision = gpu_read(gpu, VIVS_HI_CHIP_REV);
-		gpu->identity.product_id = gpu_read(gpu, VIVS_HI_CHIP_PRODUCT_ID);
-		gpu->identity.customer_id = gpu_read(gpu, VIVS_HI_CHIP_CUSTOMER_ID);
 		gpu->identity.eco_id = gpu_read(gpu, VIVS_HI_CHIP_ECO_ID);
 
+		/*
+		 * Reading these two registers on GC600 rev 0x19 result in a
+		 * unhandled fault: external abort on non-linefetch
+		 */
+		if (!etnaviv_is_model_rev(gpu, GC600, 0x19)) {
+			gpu->identity.product_id = gpu_read(gpu, VIVS_HI_CHIP_PRODUCT_ID);
+			gpu->identity.customer_id = gpu_read(gpu, VIVS_HI_CHIP_CUSTOMER_ID);
+		}
+
 		/*
 		 * !!!! HACK ALERT !!!!
 		 * Because people change device IDs without letting software
-- 
2.26.2