From b0fc0167f25401a5dd0325a935e3a20d1da2aa0b Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Tue, 29 Sep 2020 23:22:15 +0530 Subject: [PATCH] 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 Signed-off-by: Loic Poulain Signed-off-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/20200929175218.8178-17-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/bus/mhi/core/init.c | 7 +++++++ drivers/bus/mhi/core/pm.c | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index a33665b..103d51f 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -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, diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index ce4d969..3de7b16 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -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 */ -- 2.7.4