[PATCH v2 01/28] drm/panthor: Ignore -EOPNOTSUPP for shader-present nvmem lookup

[Karunika Choo <karunika.choo@arm.com>]

When CONFIG_NVMEM is disabled, reading the optional "shader-present"
nvmem cell can return -EOPNOTSUPP.

Treat this the same as the cell being absent so panthor can continue
probing on platforms that do not provide shader-present fuses through
nvmem.

Fixes: c40b50c3cfbe ("drm/panthor: Implement reading shader_present from nvmem")
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Karunika Choo <karunika.choo@arm.com>
---
v2:
- Picked up R-b from Liviu
v1:
- Picked up R-bs from Boris and Steve
- Added Fixes tag

 drivers/gpu/drm/panthor/panthor_hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
index ea1e222ef1210..34dc4b9d9dc09 100644
--- a/drivers/gpu/drm/panthor/panthor_hw.c
+++ b/drivers/gpu/drm/panthor/panthor_hw.c
@@ -182,7 +182,7 @@ static int overload_shader_present(struct panthor_device *ptdev)
 					      &contents);
 	if (!ret)
 		ptdev->gpu_info.shader_present = contents;
-	else if (ret == -ENOENT)
+	else if (ret == -ENOENT || ret == -EOPNOTSUPP)
 		return 0;
 	else
 		return dev_err_probe(ptdev->base.dev, ret,
-- 
2.43.0