add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dma/at_xdmac.c
..
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@@ -212,6 +212,7 @@
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 	int			irq;
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 	struct clk		*clk;
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 	u32			save_gim;
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+	u32			save_gs;
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 	struct dma_pool		*at_xdmac_desc_pool;
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 	struct at_xdmac_chan	chan[];
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 };
..
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@@ -677,7 +678,8 @@
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 		if (!desc) {
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 			dev_err(chan2dev(chan), "can't get descriptor\n");
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 			if (first)
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-				list_splice_init(&first->descs_list, &atchan->free_descs_list);
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+				list_splice_tail_init(&first->descs_list,
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+						      &atchan->free_descs_list);
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 			goto spin_unlock;
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 		}
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..
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@@ -765,7 +767,8 @@
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 		if (!desc) {
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 			dev_err(chan2dev(chan), "can't get descriptor\n");
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 			if (first)
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-				list_splice_init(&first->descs_list, &atchan->free_descs_list);
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+				list_splice_tail_init(&first->descs_list,
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+						      &atchan->free_descs_list);
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 			spin_unlock_irqrestore(&atchan->lock, irqflags);
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 			return NULL;
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 		}
..
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@@ -967,6 +970,8 @@
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 							NULL,
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 							src_addr, dst_addr,
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 							xt, xt->sgl);
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+		if (!first)
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+			return NULL;
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 		/* Length of the block is (BLEN+1) microblocks. */
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 		for (i = 0; i < xt->numf - 1; i++)
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@@ -997,8 +1002,9 @@
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 							       src_addr, dst_addr,
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 							       xt, chunk);
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 			if (!desc) {
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-				list_splice_init(&first->descs_list,
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-						 &atchan->free_descs_list);
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+				if (first)
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+					list_splice_tail_init(&first->descs_list,
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+							      &atchan->free_descs_list);
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 				return NULL;
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 			}
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..
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@@ -1076,7 +1082,8 @@
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 		if (!desc) {
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 			dev_err(chan2dev(chan), "can't get descriptor\n");
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 			if (first)
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-				list_splice_init(&first->descs_list, &atchan->free_descs_list);
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+				list_splice_tail_init(&first->descs_list,
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+						      &atchan->free_descs_list);
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 			return NULL;
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 		}
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..
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@@ -1250,8 +1257,8 @@
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 						   sg_dma_len(sg),
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 						   value);
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 		if (!desc && first)
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-			list_splice_init(&first->descs_list,
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-					 &atchan->free_descs_list);
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+			list_splice_tail_init(&first->descs_list,
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+					      &atchan->free_descs_list);
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 		if (!first)
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 			first = desc;
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@@ -1526,20 +1533,6 @@
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 	return ret;
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 }
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-/* Call must be protected by lock. */
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-static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan,
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-				    struct at_xdmac_desc *desc)
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-{
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-	dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc);
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-
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-	/*
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-	 * Remove the transfer from the transfer list then move the transfer
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-	 * descriptors into the free descriptors list.
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-	 */
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-	list_del(&desc->xfer_node);
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-	list_splice_init(&desc->descs_list, &atchan->free_descs_list);
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-}
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-
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 static void at_xdmac_advance_work(struct at_xdmac_chan *atchan)
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 {
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 	struct at_xdmac_desc	*desc;
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@@ -1650,17 +1643,20 @@
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 		}
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 		txd = &desc->tx_dma_desc;
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-
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-		at_xdmac_remove_xfer(atchan, desc);
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+		dma_cookie_complete(txd);
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+		/* Remove the transfer from the transfer list. */
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+		list_del(&desc->xfer_node);
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 		spin_unlock_irq(&atchan->lock);
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-		dma_cookie_complete(txd);
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 		if (txd->flags & DMA_PREP_INTERRUPT)
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 			dmaengine_desc_get_callback_invoke(txd, NULL);
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 		dma_run_dependencies(txd);
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 		spin_lock_irq(&atchan->lock);
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+		/* Move the xfer descriptors into the free descriptors list. */
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+		list_splice_tail_init(&desc->descs_list,
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+				      &atchan->free_descs_list);
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 		at_xdmac_advance_work(atchan);
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 		spin_unlock_irq(&atchan->lock);
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 	}
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@@ -1807,8 +1803,11 @@
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 		cpu_relax();
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 	/* Cancel all pending transfers. */
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-	list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
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-		at_xdmac_remove_xfer(atchan, desc);
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+	list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) {
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+		list_del(&desc->xfer_node);
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+		list_splice_tail_init(&desc->descs_list,
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+				      &atchan->free_descs_list);
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+	}
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 	clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
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 	clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
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@@ -1910,6 +1909,7 @@
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 		}
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 	}
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 	atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM);
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+	atxdmac->save_gs = at_xdmac_read(atxdmac, AT_XDMAC_GS);
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 	at_xdmac_off(atxdmac);
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 	clk_disable_unprepare(atxdmac->clk);
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@@ -1946,7 +1946,8 @@
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 			at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
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 			at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);
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 			wmb();
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-			at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
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+			if (atxdmac->save_gs & atchan->mask)
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+				at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask);
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 		}
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 	}
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 	return 0;