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habanalabs: give FW a grace time for configuring iATU

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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>
This commit is contained in:
Ofir Bitton
2021-06-18 15:23:39 +03:00
committed by Oded Gabbay
parent 90bd4798a8
commit 38fbcc6ec9
1 changed files with 4 additions and 0 deletions
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drivers/misc/habanalabs/common/pci/pci.c
+4
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@@ -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: