Re: [PATCH 1/2] mmc: dw_mmc: split out preparation of desc for IDMAC32 and IDMAC64

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Hi Jaehoon,

On 2016/8/31 14:55, Jaehoon Chung wrote:
Hi Shawn,

On 08/19/2016 06:40 PM, Shawn Lin wrote:
We intend to add more check for descriptors when
preparing desc. Let's spilt out the separate body
to make the dw_mci_translate_sglist not so lengthy.

Sorry for reviewing late.


Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---

 drivers/mmc/host/dw_mmc.c | 148 +++++++++++++++++++++++++---------------------
 1 file changed, 81 insertions(+), 67 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 32380d5..0a5a49f 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -467,103 +467,117 @@ static void dw_mci_dmac_complete_dma(void *arg)
 	}
 }

-static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
-				    unsigned int sg_len)
+static inline void dw_mci_prepare_desc64(struct dw_mci *host,
+					 struct mmc_data *data,
+					 unsigned int sg_len)
 {
 	unsigned int desc_len;
+	struct idmac_desc_64addr *desc_first, *desc_last, *desc;
 	int i;

-	if (host->dma_64bit_address == 1) {
-		struct idmac_desc_64addr *desc_first, *desc_last, *desc;
-
-		desc_first = desc_last = desc = host->sg_cpu;
+	desc_first = desc_last = desc = host->sg_cpu;

-		for (i = 0; i < sg_len; i++) {
-			unsigned int length = sg_dma_len(&data->sg[i]);
+	for (i = 0; i < sg_len; i++) {
+		unsigned int length = sg_dma_len(&data->sg[i]);

-			u64 mem_addr = sg_dma_address(&data->sg[i]);
+		u64 mem_addr = sg_dma_address(&data->sg[i]);

-			for ( ; length ; desc++) {
-				desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
-					   length : DW_MCI_DESC_DATA_LENGTH;
+		for ( ; length ; desc++) {
+			desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
+				   length : DW_MCI_DESC_DATA_LENGTH;

-				length -= desc_len;
+			length -= desc_len;

-				/*
-				 * Set the OWN bit and disable interrupts
-				 * for this descriptor
-				 */
-				desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
-							IDMAC_DES0_CH;
+			/*
+			 * Set the OWN bit and disable interrupts
+			 * for this descriptor
+			 */
+			desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
+						IDMAC_DES0_CH;

-				/* Buffer length */
-				IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len);
+			/* Buffer length */
+			IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len);

-				/* Physical address to DMA to/from */
-				desc->des4 = mem_addr & 0xffffffff;
-				desc->des5 = mem_addr >> 32;
+			/* Physical address to DMA to/from */
+			desc->des4 = mem_addr & 0xffffffff;
+			desc->des5 = mem_addr >> 32;

-				/* Update physical address for the next desc */
-				mem_addr += desc_len;
+			/* Update physical address for the next desc */
+			mem_addr += desc_len;

-				/* Save pointer to the last descriptor */
-				desc_last = desc;
-			}
+			/* Save pointer to the last descriptor */
+			desc_last = desc;
 		}
+	}

-		/* Set first descriptor */
-		desc_first->des0 |= IDMAC_DES0_FD;
+	/* Set first descriptor */
+	desc_first->des0 |= IDMAC_DES0_FD;

-		/* Set last descriptor */
-		desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
-		desc_last->des0 |= IDMAC_DES0_LD;
+	/* Set last descriptor */
+	desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
+	desc_last->des0 |= IDMAC_DES0_LD;
+}

-	} else {
-		struct idmac_desc *desc_first, *desc_last, *desc;

-		desc_first = desc_last = desc = host->sg_cpu;
+static inline void dw_mci_prepare_desc32(struct dw_mci *host,
+					 struct mmc_data *data,
+					 unsigned int sg_len)
+{
+	unsigned int desc_len;
+	struct idmac_desc *desc_first, *desc_last, *desc;
+	int i;

-		for (i = 0; i < sg_len; i++) {
-			unsigned int length = sg_dma_len(&data->sg[i]);
+	desc_first = desc_last = desc = host->sg_cpu;

-			u32 mem_addr = sg_dma_address(&data->sg[i]);
+	for (i = 0; i < sg_len; i++) {
+		unsigned int length = sg_dma_len(&data->sg[i]);

-			for ( ; length ; desc++) {
-				desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
-					   length : DW_MCI_DESC_DATA_LENGTH;
+		u32 mem_addr = sg_dma_address(&data->sg[i]);

-				length -= desc_len;
+		for ( ; length ; desc++) {
+			desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
+				   length : DW_MCI_DESC_DATA_LENGTH;

-				/*
-				 * Set the OWN bit and disable interrupts
-				 * for this descriptor
-				 */
-				desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
-							 IDMAC_DES0_DIC |
-							 IDMAC_DES0_CH);
+			length -= desc_len;

-				/* Buffer length */
-				IDMAC_SET_BUFFER1_SIZE(desc, desc_len);
+			/*
+			 * Set the OWN bit and disable interrupts
+			 * for this descriptor
+			 */
+			desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
+						 IDMAC_DES0_DIC |
+						 IDMAC_DES0_CH);

-				/* Physical address to DMA to/from */
-				desc->des2 = cpu_to_le32(mem_addr);
+			/* Buffer length */
+			IDMAC_SET_BUFFER1_SIZE(desc, desc_len);

-				/* Update physical address for the next desc */
-				mem_addr += desc_len;
+			/* Physical address to DMA to/from */
+			desc->des2 = cpu_to_le32(mem_addr);

-				/* Save pointer to the last descriptor */
-				desc_last = desc;
-			}
+			/* Update physical address for the next desc */
+			mem_addr += desc_len;
+
+			/* Save pointer to the last descriptor */
+			desc_last = desc;
 		}
+	}

-		/* Set first descriptor */
-		desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD);
+	/* Set first descriptor */
+	desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD);

-		/* Set last descriptor */
-		desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
-					       IDMAC_DES0_DIC));
-		desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
-	}
+	/* Set last descriptor */
+	desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
+				       IDMAC_DES0_DIC));
+	desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
+}
+
+static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
+				    unsigned int sg_len)
+{
+	if (host->dma_64bit_address == 1)
+		dw_mci_prepare_desc64(host, data, sg_len);
+	else
+		dw_mci_prepare_desc32(host, data, sg_len);

I think dw_mci_translate_sglist can be removed.
Instead, these functions should be called in dw_mci_idamc_start_dma().
How about?


Sounds fine, I will do it.

Best Regards,
Jaehoon Chung


 	wmb(); /* drain writebuffer */
 }







--
Best Regards
Shawn Lin

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