[PATCH 5/5] habanalabs: give FW a grace time for configuring iATU

[Oded Gabbay <ogabbay@kernel.org>]

From: Ofir Bitton <obitton@habana.ai>

iATU (internal Address Translation Unit of the PCI controller)
configuration is being done by FW right after driver enables
the PCI device. Hence, driver must add a minor sleep afterwards
in order to make sure FW finishes configuring iATU regions.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
---
 drivers/misc/habanalabs/common/pci/pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/misc/habanalabs/common/pci/pci.c b/drivers/misc/habanalabs/common/pci/pci.c
index 9ef6c46a3146..8e7982be6191 100644
--- a/drivers/misc/habanalabs/common/pci/pci.c
+++ b/drivers/misc/habanalabs/common/pci/pci.c
@@ -430,6 +430,10 @@ int hl_pci_init(struct hl_device *hdev)
 		goto unmap_pci_bars;
 	}
 
+	/* Driver must sleep in order for FW to finish the iATU configuration */
+	if (hdev->asic_prop.iatu_done_by_fw)
+		usleep_range(2000, 3000);
+
 	return 0;
 
 unmap_pci_bars:
-- 
2.25.1