dmaengine: ti: k3-udma: Set EOP for all TRs in cyclic BCDMA transfer

When receiving data in cyclic mode from PDMA peripherals, where reload
count is set to infinite, any TR in the set can potentially be the last
one of the overall transfer. In such cases, the EOP flag needs to be set
in each TR and PDMA's Static TR "Z" parameter should be set, matching
the size of the TR.

This is required for the teardown to function properly and cleanup the
internal state memory. This only affects platforms using BCDMA and not
those using UDMA-P, which could set EOP flag in the teardown TR
automatically.

Similarly when transmitting data in cyclic mode to PDMA peripherals, the
EOP flag needs to be set to get the teardown completion signal
correctly.

Fixes: 0177947 ("dmaengine: ti: k3-udma: Initial support for K3 BCDMA")
Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com> # Toradex Verdin AM62
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Signed-off-by: Jai Luthra <jai.luthra@linux.dev>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20240930-z_cnt-v2-1-9d38aba149a2@linux.dev
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: jailuthra

drivers/dma/ti/k3-udma.c

@@ -3185,27 +3185,40 @@ static int udma_configure_statictr(struct udma_chan *uc, struct udma_desc *d,
 
 	d->static_tr.elcnt = elcnt;
 
-	/*
-	 * PDMA must to close the packet when the channel is in packet mode.
-	 * For TR mode when the channel is not cyclic we also need PDMA to close
-	 * the packet otherwise the transfer will stall because PDMA holds on
-	 * the data it has received from the peripheral.
-	 */
 	if (uc->config.pkt_mode || !uc->cyclic) {
+		/*
+		 * PDMA must close the packet when the channel is in packet mode.
+		 * For TR mode when the channel is not cyclic we also need PDMA
+		 * to close the packet otherwise the transfer will stall because
+		 * PDMA holds on the data it has received from the peripheral.
+		 */
 		unsigned int div = dev_width * elcnt;
 
 		if (uc->cyclic)
 			d->static_tr.bstcnt = d->residue / d->sglen / div;
 		else
 			d->static_tr.bstcnt = d->residue / div;
+	} else if (uc->ud->match_data->type == DMA_TYPE_BCDMA &&
+		   uc->config.dir == DMA_DEV_TO_MEM &&
+		   uc->cyclic) {
+		/*
+		 * For cyclic mode with BCDMA we have to set EOP in each TR to
+		 * prevent short packet errors seen on channel teardown. So the
+		 * PDMA must close the packet after every TR transfer by setting
+		 * burst count equal to the number of bytes transferred.
+		 */
+		struct cppi5_tr_type1_t *tr_req = d->hwdesc[0].tr_req_base;
 
-		if (uc->config.dir == DMA_DEV_TO_MEM &&
-		    d->static_tr.bstcnt > uc->ud->match_data->statictr_z_mask)
-			return -EINVAL;
+		d->static_tr.bstcnt =
+			(tr_req->icnt0 * tr_req->icnt1) / dev_width;
 	} else {
 		d->static_tr.bstcnt = 0;
 	}
 
+	if (uc->config.dir == DMA_DEV_TO_MEM &&
+	    d->static_tr.bstcnt > uc->ud->match_data->statictr_z_mask)
+		return -EINVAL;
+
 	return 0;
 }
 
@@ -3450,8 +3463,9 @@ udma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	/* static TR for remote PDMA */
 	if (udma_configure_statictr(uc, d, dev_width, burst)) {
 		dev_err(uc->ud->dev,
-			"%s: StaticTR Z is limited to maximum 4095 (%u)\n",
-			__func__, d->static_tr.bstcnt);
+			"%s: StaticTR Z is limited to maximum %u (%u)\n",
+			__func__, uc->ud->match_data->statictr_z_mask,
+			d->static_tr.bstcnt);
 
 		udma_free_hwdesc(uc, d);
 		kfree(d);
@@ -3476,6 +3490,7 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
 	u16 tr0_cnt0, tr0_cnt1, tr1_cnt0;
 	unsigned int i;
 	int num_tr;
+	u32 period_csf = 0;
 
 	num_tr = udma_get_tr_counters(period_len, __ffs(buf_addr), &tr0_cnt0,
 				      &tr0_cnt1, &tr1_cnt0);
@@ -3498,6 +3513,20 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
 		period_addr = buf_addr |
 			((u64)uc->config.asel << K3_ADDRESS_ASEL_SHIFT);
 
+	/*
+	 * For BCDMA <-> PDMA transfers, the EOP flag needs to be set on the
+	 * last TR of a descriptor, to mark the packet as complete.
+	 * This is required for getting the teardown completion message in case
+	 * of TX, and to avoid short-packet error in case of RX.
+	 *
+	 * As we are in cyclic mode, we do not know which period might be the
+	 * last one, so set the flag for each period.
+	 */
+	if (uc->config.ep_type == PSIL_EP_PDMA_XY &&
+	    uc->ud->match_data->type == DMA_TYPE_BCDMA) {
+		period_csf = CPPI5_TR_CSF_EOP;
+	}
+
 	for (i = 0; i < periods; i++) {
 		int tr_idx = i * num_tr;
 
@@ -3525,8 +3554,10 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
 		}
 
 		if (!(flags & DMA_PREP_INTERRUPT))
-			cppi5_tr_csf_set(&tr_req[tr_idx].flags,
-					 CPPI5_TR_CSF_SUPR_EVT);
+			period_csf |= CPPI5_TR_CSF_SUPR_EVT;
+
+		if (period_csf)
+			cppi5_tr_csf_set(&tr_req[tr_idx].flags, period_csf);
 
 		period_addr += period_len;
 	}
@@ -3655,8 +3686,9 @@ udma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
 	/* static TR for remote PDMA */
 	if (udma_configure_statictr(uc, d, dev_width, burst)) {
 		dev_err(uc->ud->dev,
-			"%s: StaticTR Z is limited to maximum 4095 (%u)\n",
-			__func__, d->static_tr.bstcnt);
+			"%s: StaticTR Z is limited to maximum %u (%u)\n",
+			__func__, uc->ud->match_data->statictr_z_mask,
+			d->static_tr.bstcnt);
 
 		udma_free_hwdesc(uc, d);
 		kfree(d);