Merge tag 'dmaengine-fix-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine

Pull dmaengine fixes from Vinod Koul:

 - TI driver fix to set EOP for cyclic BCDMA transfers

 - sh rz-dmac driver fix for handling config with zero address

* tag 'dmaengine-fix-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine:
  dmaengine: ti: k3-udma: Set EOP for all TRs in cyclic BCDMA transfer
  dmaengine: sh: rz-dmac: handle configs where one address is zero

Author: torvalds

drivers/dma/sh/rz-dmac.c

@@ -601,22 +601,25 @@ static int rz_dmac_config(struct dma_chan *chan,
 	struct rz_dmac_chan *channel = to_rz_dmac_chan(chan);
 	u32 val;
 
-	channel->src_per_address = config->src_addr;
 	channel->dst_per_address = config->dst_addr;
-
-	val = rz_dmac_ds_to_val_mapping(config->dst_addr_width);
-	if (val == CHCFG_DS_INVALID)
-		return -EINVAL;
-
 	channel->chcfg &= ~CHCFG_FILL_DDS_MASK;
-	channel->chcfg |= FIELD_PREP(CHCFG_FILL_DDS_MASK, val);
+	if (channel->dst_per_address) {
+		val = rz_dmac_ds_to_val_mapping(config->dst_addr_width);
+		if (val == CHCFG_DS_INVALID)
+			return -EINVAL;
 
-	val = rz_dmac_ds_to_val_mapping(config->src_addr_width);
-	if (val == CHCFG_DS_INVALID)
-		return -EINVAL;
+		channel->chcfg |= FIELD_PREP(CHCFG_FILL_DDS_MASK, val);
+	}
 
+	channel->src_per_address = config->src_addr;
 	channel->chcfg &= ~CHCFG_FILL_SDS_MASK;
-	channel->chcfg |= FIELD_PREP(CHCFG_FILL_SDS_MASK, val);
+	if (channel->src_per_address) {
+		val = rz_dmac_ds_to_val_mapping(config->src_addr_width);
+		if (val == CHCFG_DS_INVALID)
+			return -EINVAL;
+
+		channel->chcfg |= FIELD_PREP(CHCFG_FILL_SDS_MASK, val);
+	}
 
 	return 0;
 }

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);