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>
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@ -162,6 +162,13 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl)
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if (mhi_event->offload_ev)
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continue;
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if (mhi_event->irq >= mhi_cntrl->nr_irqs) {
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dev_err(dev, "irq %d not available for event ring\n",
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mhi_event->irq);
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ret = -EINVAL;
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goto error_request;
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}
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ret = request_irq(mhi_cntrl->irq[mhi_event->irq],
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mhi_irq_handler,
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IRQF_SHARED | IRQF_NO_SUSPEND,
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@ -918,7 +918,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
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dev_info(dev, "Requested to power ON\n");
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if (mhi_cntrl->nr_irqs < mhi_cntrl->total_ev_rings)
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if (mhi_cntrl->nr_irqs < 1)
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return -EINVAL;
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/* Supply default wake routines if not provided by controller driver */
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