Avoid exposing each of the 4 Hantro H1 cores separately to userspace.
For now just expose the first one.
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
---
.../media/platform/verisilicon/hantro_drv.c | 38 +++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index 34b123dafd89..b722a20c5fe3 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -722,6 +722,7 @@ static const struct of_device_id of_hantro_match[] = {
{ .compatible = "rockchip,rk3399-vpu", .data = &rk3399_vpu_variant, },
{ .compatible = "rockchip,rk3568-vepu", .data = &rk3568_vepu_variant, },
{ .compatible = "rockchip,rk3568-vpu", .data = &rk3568_vpu_variant, },
+ { .compatible = "rockchip,rk3588-vepu121", .data = &rk3568_vpu_variant, },
{ .compatible = "rockchip,rk3588-av1-vpu", .data = &rk3588_vpu981_variant, },
#endif
#ifdef CONFIG_VIDEO_HANTRO_IMX8M
@@ -992,6 +993,39 @@ static const struct media_device_ops hantro_m2m_media_ops = {
.req_queue = v4l2_m2m_request_queue,
};
+/*
+ * Some SoCs, like RK3588 have multiple identical Hantro cores, but the
+ * kernel is currently missing support for multi-core handling. Exposing
+ * separate devices for each core to userspace is bad, since that does
+ * not allow scheduling tasks properly (and creates ABI). With this workaround
+ * the driver will only probe for the first core and early exit for the other
+ * cores. Once the driver gains multi-core support, the same technique
+ * for detecting the main core can be used to cluster all cores together.
+ */
+static int hantro_disable_multicore(struct hantro_dev *vpu)
+{
+ const char *compatible;
+ struct device_node *node;
+ int ret;
+
+ /* Intentionally ignores the fallback strings */
+ ret = of_property_read_string(vpu->dev->of_node, "compatible", &compatible);
+ if (ret)
+ return ret;
+
+ /* first compatible node found from the root node is considered the main core */
+ node = of_find_compatible_node(NULL, NULL, compatible);
+ if (!node)
+ return -EINVAL; /* broken DT? */
+
+ if (vpu->dev->of_node != node) {
+ dev_info(vpu->dev, "missing multi-core support, ignoring this instance\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
static int hantro_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
@@ -1011,6 +1045,10 @@ static int hantro_probe(struct platform_device *pdev)
match = of_match_node(of_hantro_match, pdev->dev.of_node);
vpu->variant = match->data;
+ ret = hantro_disable_multicore(vpu);
+ if (ret)
+ return ret;
+
/*
* Support for nxp,imx8mq-vpu is kept for backwards compatibility
* but it's deprecated. Please update your DTS file to use
--
2.43.0
