tjh.dev / kernel
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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: 5571519009d0 ("bus: mhi: host: pci_generic: Add SDX75 based modem support")
Signed-off-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
Signed-off-by: Manivannan 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

authored by

Qiang Yu and committed by
Manivannan Sadhasivam cfdb41ad 54b022f1

+1 -1
+1 -1
drivers/bus/mhi/host/pci_generic.c
··· 1417 1417 goto err_unregister; 1418 1418 } 1419 1419 1420 - err = mhi_sync_power_up(mhi_cntrl); 1420 + err = mhi_async_power_up(mhi_cntrl); 1421 1421 if (err) { 1422 1422 dev_err(&pdev->dev, "failed to power up MHI controller\n"); 1423 1423 goto err_unprepare;