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It needs a provider operation to clear stale LL interrupt status before a channel restart. Add it. Centralize runtime request updates in dw_edma_set_request(). A later patch uses it to cancel a pending LL recheck when STOP or PAUSE changes the channel policy. Rename the existing workqueue event bits to distinguish them from provider IRQ events. No functional change. Reviewed-by: Frank Li Signed-off-by: Koichiro Den --- Changes in v5: - Drop the remaining 'event_scope', which should not have been present in v4. (Frank) drivers/dma/dw-edma/dw-edma-core.c | 35 ++++++++++++++++----------- drivers/dma/dw-edma/dw-edma-core.h | 6 +++++ drivers/dma/dw-edma/dw-edma-v0-core.c | 1 + drivers/dma/dw-edma/dw-hdma-v0-core.c | 1 + 4 files changed, 29 insertions(+), 14 deletions(-) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index 5a8407ca68a2..bbfd82b12ab5 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -30,9 +30,9 @@ struct dw_edma_desc *vd2dw_edma_desc(struct virt_dma_desc *vd) return container_of(vd, struct dw_edma_desc, vd); } -enum dw_edma_irq_event { - DW_EDMA_IRQ_DONE = BIT(0), - DW_EDMA_IRQ_ABORT = BIT(1), +enum dw_edma_deferred_event { + DW_EDMA_DEFERRED_DONE = BIT(0), + DW_EDMA_DEFERRED_ABORT = BIT(1), }; static inline @@ -73,6 +73,13 @@ static void vchan_free_desc(struct virt_dma_desc *vdesc) kfree(vd2dw_edma_desc(vdesc)); } +/* Must be called with vc.lock held. */ +static void +dw_edma_set_request(struct dw_edma_chan *chan, enum dw_edma_request request) +{ + chan->request = request; +} + static void dw_hdma_set_callback_result(struct virt_dma_desc *vd, enum dmaengine_tx_result result) { @@ -243,7 +250,7 @@ static void dw_edma_finish_termination(struct dw_edma_chan *chan) if (!chan->non_ll && dw_edma_ll_pending(chan)) dw_edma_core_reset_ll(chan); - chan->request = EDMA_REQ_NONE; + dw_edma_set_request(chan, EDMA_REQ_NONE); chan->status = EDMA_ST_IDLE; } @@ -360,7 +367,7 @@ static int dw_edma_device_pause(struct dma_chan *dchan) else if (chan->request != EDMA_REQ_NONE) err = -EPERM; else - chan->request = EDMA_REQ_PAUSE; + dw_edma_set_request(chan, EDMA_REQ_PAUSE); return err; } @@ -410,10 +417,10 @@ static int dw_edma_device_terminate_all(struct dma_chan *dchan) } else if (chan->request > EDMA_REQ_PAUSE) { err = -EPERM; } else { - chan->request = EDMA_REQ_STOP; + dw_edma_set_request(chan, EDMA_REQ_STOP); } if (chan->status == EDMA_ST_IDLE) - chan->request = EDMA_REQ_NONE; + dw_edma_set_request(chan, EDMA_REQ_NONE); return err; } @@ -724,7 +731,7 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan) } if (chan->request == EDMA_REQ_PAUSE) { - chan->request = EDMA_REQ_NONE; + dw_edma_set_request(chan, EDMA_REQ_NONE); chan->status = EDMA_ST_PAUSE; break; } @@ -764,7 +771,7 @@ static void dw_edma_abort_interrupt(struct dw_edma_chan *chan) } if (!chan->non_ll) dw_edma_core_reset_ll(chan); - chan->request = EDMA_REQ_NONE; + dw_edma_set_request(chan, EDMA_REQ_NONE); chan->status = EDMA_ST_IDLE; spin_unlock_irqrestore(&chan->vc.lock, flags); } @@ -778,15 +785,15 @@ static void dw_edma_irq_work(struct work_struct *work) do { events = atomic_xchg(&chan->irq_pending, 0); - if (events & DW_EDMA_IRQ_DONE) + if (events & DW_EDMA_DEFERRED_DONE) dw_edma_done_interrupt(chan); - if (events & DW_EDMA_IRQ_ABORT) + if (events & DW_EDMA_DEFERRED_ABORT) dw_edma_abort_interrupt(chan); } while (atomic_read(&chan->irq_pending)); } static void dw_edma_queue_irq_work(struct dw_edma_chan *chan, - enum dw_edma_irq_event event) + enum dw_edma_deferred_event event) { atomic_or(event, &chan->irq_pending); queue_work(chan->dw->wq, &chan->irq_work); @@ -794,12 +801,12 @@ static void dw_edma_queue_irq_work(struct dw_edma_chan *chan, static void dw_edma_done_interrupt_deferred(struct dw_edma_chan *chan) { - dw_edma_queue_irq_work(chan, DW_EDMA_IRQ_DONE); + dw_edma_queue_irq_work(chan, DW_EDMA_DEFERRED_DONE); } static void dw_edma_abort_interrupt_deferred(struct dw_edma_chan *chan) { - dw_edma_queue_irq_work(chan, DW_EDMA_IRQ_ABORT); + dw_edma_queue_irq_work(chan, DW_EDMA_DEFERRED_ABORT); } static void dw_edma_emul_irq_ack(struct irq_data *d) diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h index 761a5ab4bbb5..8d993e8cccbb 100644 --- a/drivers/dma/dw-edma/dw-edma-core.h +++ b/drivers/dma/dw-edma/dw-edma-core.h @@ -163,6 +163,7 @@ struct dw_edma_core_ops { void (*ll_link)(struct dw_edma_chan *chan, u32 idx, bool cb, u64 addr); void (*ll_clear)(struct dw_edma_chan *chan, u32 idx); int (*ll_cur_idx)(struct dw_edma_chan *chan); + void (*ll_irq_clear)(struct dw_edma_chan *chan); void (*ch_doorbell)(struct dw_edma_chan *chan); void (*ch_enable)(struct dw_edma_chan *chan); void (*ch_config)(struct dw_edma_chan *chan); @@ -284,6 +285,11 @@ static inline void dw_edma_core_ll_clear(struct dw_edma_chan *chan, u32 idx) chan->dw->core->ll_clear(chan, idx); } +static inline void dw_edma_core_ll_irq_clear(struct dw_edma_chan *chan) +{ + chan->dw->core->ll_irq_clear(chan); +} + static inline void dw_edma_core_ch_doorbell(struct dw_edma_chan *chan) { chan->dw->core->ch_doorbell(chan); diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c index bb86d2f60ab5..9053354eda67 100644 --- a/drivers/dma/dw-edma/dw-edma-v0-core.c +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c @@ -686,6 +686,7 @@ static const struct dw_edma_core_ops dw_edma_v0_core = { .ll_link = dw_edma_v0_core_ll_link, .ll_clear = dw_edma_v0_core_ll_clear, .ll_cur_idx = dw_edma_v0_core_ll_cur_idx, + .ll_irq_clear = dw_edma_v0_core_clear_done_int, .ch_doorbell = dw_edma_v0_core_ch_doorbell, .ch_enable = dw_edma_v0_core_ch_enable, .ch_config = dw_edma_v0_core_ch_config, diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c index 47d7a01658eb..4acbace43519 100644 --- a/drivers/dma/dw-edma/dw-hdma-v0-core.c +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c @@ -442,6 +442,7 @@ static const struct dw_edma_core_ops dw_hdma_v0_core = { .ll_link = dw_hdma_v0_core_ll_link, .ll_clear = dw_hdma_v0_core_ll_clear, .ll_cur_idx = dw_hdma_v0_core_ll_cur_idx, + .ll_irq_clear = dw_hdma_v0_core_clear_done_int, .ch_doorbell = dw_hdma_v0_core_ch_doorbell, .ch_enable = dw_hdma_v0_core_ch_enable, .ch_config = dw_hdma_v0_core_ch_config, -- 2.51.0