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bus: mhi: core: Allow shared IRQ for event rings 

There is no requirement for using a dedicated IRQ per event ring.
Some systems does not support multiple MSI vectors (e.g. intel
without CONFIG_IRQ_REMAP), In that case the MHI controller can
configure all the event rings to use the same interrupt (as fallback).

Allow this by removing the nr_irqs = ev_ring test and add extra check
in the irq_setup function.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200929175218.8178-17-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Loic Poulain 2020-09-29 23:22:15 +05:30 committed by Greg Kroah-Hartman
parent 21cb9b18ed
commit b0fc0167f2
2 changed files with 8 additions and 1 deletions
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7
drivers/bus/mhi/core/init.c
View File

@ -162,6 +162,13 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
if (mhi_event->offload_ev)
continue;
if (mhi_event->irq >= mhi_cntrl->nr_irqs) {
dev_err(dev, "irq %d not available for event ring\n",
mhi_event->irq);
ret = -EINVAL;
goto error_request;
}
ret = request_irq(mhi_cntrl->irq[mhi_event->irq],
mhi_irq_handler,
IRQF_SHARED | IRQF_NO_SUSPEND,

2
drivers/bus/mhi/core/pm.c
View File

@ -918,7 +918,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
dev_info(dev, "Requested to power ON\n");
if (mhi_cntrl->nr_irqs < mhi_cntrl->total_ev_rings)
if (mhi_cntrl->nr_irqs < 1)
return -EINVAL;
/* Supply default wake routines if not provided by controller driver */