Commit cfdb41ad authored by Qiang Yu's avatar Qiang Yu Committed by Manivannan Sadhasivam
Browse files

bus: mhi: host: pci_generic: Switch to async power up to avoid boot delays 



Some modem devices can take significant time (up to 20 secs for sdx75) to
enter mission mode during initialization. Currently, mhi_sync_power_up()
waits for this entire process to complete, blocking other driver probes
and delaying system boot.

Switch to mhi_async_power_up() so probe can return immediately while MHI
initialization continues in the background. This eliminates lengthy boot
delays and allows other drivers to probe in parallel, improving overall
system boot performance.

Fixes: 55715190 ("bus: mhi: host: pci_generic: Add SDX75 based modem support")
Signed-off-by: default avatarQiang Yu <qiang.yu@oss.qualcomm.com>
Signed-off-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260303-b4-async_power_on-v2-1-d3db81eb457d@oss.qualcomm.com
parent 54b022f1

drivers/bus/mhi/host/pci_generic.c

+1 −1
Original line number Diff line number Diff line
@@ -1417,7 +1417,7 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
		goto err_unregister;

	}



	err = mhi_sync_power_up(mhi_cntrl);

	err = mhi_async_power_up(mhi_cntrl);

	if (err) {

		dev_err(&pdev->dev, "failed to power up MHI controller\n");

		goto err_unprepare;