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| author | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2023-10-26 10:25:13 +0530 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2023-12-14 11:58:49 +0530 |
| commit | cea4bcbf997ab2f6c8d242f41785b21ea91d53c3 (patch) | |
| tree | 2c4a2174bc0bc0dc7b105523391364dcd25ce010 /drivers/bus/mhi/ep/ring.c | |
| parent | 62210a26cd4f8ad52683a71c0226dfe85de1144d (diff) | |
| download | linux-stable-cea4bcbf997ab2f6c8d242f41785b21ea91d53c3.tar.gz linux-stable-cea4bcbf997ab2f6c8d242f41785b21ea91d53c3.tar.bz2 linux-stable-cea4bcbf997ab2f6c8d242f41785b21ea91d53c3.zip | |
bus: mhi: ep: Add support for interrupt moderation timer
MHI spec defines the interrupt moderation timer feature using which the
host can limit the number of interrupts being raised for an event ring by
the device. This feature allows the host to process multiple event ring
elements by a single IRQ from the device, thereby eliminating the need to
process IRQ for each element.
The INTMODT field in the event context array provides the value to be used
for delaying the IRQ generation from device. This value, along with the
Block Event Interrupt (BEI) flag of the TRE defines how IRQ is generated to
the host.
Support for interrupt moderation timer is implemented using delayed
workqueue in kernel. And a separate delayed work item is used for each
event ring.
Link: https://lore.kernel.org/r/20231026045513.12981-1-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus/mhi/ep/ring.c')
| -rw-r--r-- | drivers/bus/mhi/ep/ring.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/bus/mhi/ep/ring.c b/drivers/bus/mhi/ep/ring.c index 115518ec76a4..a1071c13761b 100644 --- a/drivers/bus/mhi/ep/ring.c +++ b/drivers/bus/mhi/ep/ring.c @@ -157,6 +157,15 @@ void mhi_ep_ring_init(struct mhi_ep_ring *ring, enum mhi_ep_ring_type type, u32 } } +static void mhi_ep_raise_irq(struct work_struct *work) +{ + struct mhi_ep_ring *ring = container_of(work, struct mhi_ep_ring, intmodt_work.work); + struct mhi_ep_cntrl *mhi_cntrl = ring->mhi_cntrl; + + mhi_cntrl->raise_irq(mhi_cntrl, ring->irq_vector); + WRITE_ONCE(ring->irq_pending, false); +} + int mhi_ep_ring_start(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_ring *ring, union mhi_ep_ring_ctx *ctx) { @@ -173,8 +182,13 @@ int mhi_ep_ring_start(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_ring *ring, if (ring->type == RING_TYPE_CH) ring->er_index = le32_to_cpu(ring->ring_ctx->ch.erindex); - if (ring->type == RING_TYPE_ER) + if (ring->type == RING_TYPE_ER) { ring->irq_vector = le32_to_cpu(ring->ring_ctx->ev.msivec); + ring->intmodt = FIELD_GET(EV_CTX_INTMODT_MASK, + le32_to_cpu(ring->ring_ctx->ev.intmod)); + + INIT_DELAYED_WORK(&ring->intmodt_work, mhi_ep_raise_irq); + } /* During ring init, both rp and wp are equal */ memcpy_fromio(&val, (void __iomem *) &ring->ring_ctx->generic.rp, sizeof(u64)); @@ -201,6 +215,9 @@ int mhi_ep_ring_start(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_ring *ring, void mhi_ep_ring_reset(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_ring *ring) { + if (ring->type == RING_TYPE_ER) + cancel_delayed_work_sync(&ring->intmodt_work); + ring->started = false; kfree(ring->ring_cache); ring->ring_cache = NULL; |