From 49fde1b8bfbf5c9bf2d3c86a637c2472ce0f89c6 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Fri, 11 Feb 2022 14:56:17 -0500
Subject: [PATCH] drm/panfrost: Add the MT8192 GPU ID

MediaTek MT8192 has a Mali-G57 with a special GPU ID. Add its GPU ID,
but treat it as otherwise identical to a standard Mali-G57.

We do _not_ fix up the GPU ID here -- userspace needs to be aware of the
special GPU ID, in case we find functional differences between
MediaTek's implementation and the standard Mali-G57 down the line.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
---
 drivers/gpu/drm/panfrost/panfrost_gpu.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index 6452e4e900dd7..560d337f5275a 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -204,6 +204,14 @@ static const struct panfrost_model gpu_models[] = {
 
 	GPU_MODEL(g57, 0x9001,
 		GPU_REV(g57, 0, 0)),
+
+        /* MediaTek MT8192 has a Mali-G57 with a different GPU ID from the
+         * standard. Arm's driver does not appear to handle this model.
+         * ChromeOS has a hack downstream for it. Treat it as equivalent to
+         * standard Mali-G57 for now.
+         */
+	GPU_MODEL(g57, 0x9003,
+		GPU_REV(g57, 0, 0)),
 };
 
 static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
-- 
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