On 2020-09-21 00:36, Loic Poulain wrote:
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.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
---
v2: keep nr_irqs check early in init sequence
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 19ade8a..31961af 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -125,6 +125,13 @@ 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
*/
It would be better if we can remove this check altogether from the
mhi_async_power_up()
function and instead place it as one of the checks in
mhi_register_controller() in init.c.
That way, we don't have to wait until power up attempt to determine
whether the provided
controller configuration is acceptable and can bail out early from the
mhi_register_controller() function itself.
if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
!mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
- !mhi_cntrl->write_reg)
+ !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs)
Thanks,
Bhaumik
