Commit 7d05b3e8 authored by Tomoya MORINAGA's avatar Tomoya MORINAGA Committed by Grant Likely
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spi-topcliff-pch: Fix issue for transmitting over 4KByte 



Currently, when spi-topcliff-pch receives transmit request over 4KByte,
this driver can't process correctly. This driver needs to divide the data
into 4Kbyte unit.
This patch fixes the issue.

Signed-off-by: default avatarTomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent ee2ece52

drivers/spi/spi-topcliff-pch.c

+55 −11
Original line number Diff line number Diff line
@@ -196,6 +196,7 @@ struct pch_spi_data { 
	struct pch_spi_dma_ctrl dma;

	int use_dma;

	u8 irq_reg_sts;

	int save_total_len;

};



/**
@@ -823,11 +824,13 @@ static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) 
		rx_dma_buf = data->dma.rx_buf_virt;

		for (j = 0; j < data->bpw_len; j++)

			*rx_buf++ = *rx_dma_buf++ & 0xFF;

		data->cur_trans->rx_buf = rx_buf;

	} else {

		rx_sbuf = data->cur_trans->rx_buf;

		rx_dma_sbuf = data->dma.rx_buf_virt;

		for (j = 0; j < data->bpw_len; j++)

			*rx_sbuf++ = *rx_dma_sbuf++;

		data->cur_trans->rx_buf = rx_sbuf;

	}

}
@@ -853,6 +856,9 @@ static int pch_spi_start_transfer(struct pch_spi_data *data) 
	rtn = wait_event_interruptible_timeout(data->wait,

					       data->transfer_complete,

					       msecs_to_jiffies(2 * HZ));

	if (!rtn)

		dev_err(&data->master->dev,

			"%s wait-event timeout\n", __func__);



	dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,

			    DMA_FROM_DEVICE);
@@ -989,6 +995,7 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) 
	int i;

	int size;

	int rem;

	int head;

	unsigned long flags;

	struct pch_spi_dma_ctrl *dma;
@@ -1017,6 +1024,11 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) 
	}

	data->bpw_len = data->cur_trans->len / (*bpw / 8);



	if (data->bpw_len > PCH_BUF_SIZE) {

		data->bpw_len = PCH_BUF_SIZE;

		data->cur_trans->len -= PCH_BUF_SIZE;

	}



	/* copy Tx Data */

	if (data->cur_trans->tx_buf != NULL) {

		if (*bpw == 8) {
@@ -1031,10 +1043,17 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) 
				*tx_dma_sbuf++ = *tx_sbuf++;

		}

	}



	/* Calculate Rx parameter for DMA transmitting */

	if (data->bpw_len > PCH_DMA_TRANS_SIZE) {

		if (data->bpw_len % PCH_DMA_TRANS_SIZE) {

			num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;

		size = PCH_DMA_TRANS_SIZE;

			rem = data->bpw_len % PCH_DMA_TRANS_SIZE;

		} else {

			num = data->bpw_len / PCH_DMA_TRANS_SIZE;

			rem = PCH_DMA_TRANS_SIZE;

		}

		size = PCH_DMA_TRANS_SIZE;

	} else {

		num = 1;

		size = data->bpw_len;
@@ -1094,15 +1113,23 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) 
	dma->nent = num;

	dma->desc_rx = desc_rx;



	/* TX */

	if (data->bpw_len > PCH_DMA_TRANS_SIZE) {

	/* Calculate Tx parameter for DMA transmitting */

	if (data->bpw_len > PCH_MAX_FIFO_DEPTH) {

		head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE;

		if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) {

			num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;

			rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head;

		} else {

			num = data->bpw_len / PCH_DMA_TRANS_SIZE;

			rem = data->bpw_len % PCH_DMA_TRANS_SIZE +

			      PCH_DMA_TRANS_SIZE - head;

		}

		size = PCH_DMA_TRANS_SIZE;

		rem = 16;

	} else {

		num = 1;

		size = data->bpw_len;

		rem = data->bpw_len;

		head = 0;

	}



	dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
@@ -1112,11 +1139,17 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) 
	for (i = 0; i < num; i++, sg++) {

		if (i == 0) {

			sg->offset = 0;

			sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,

				    sg->offset);

			sg_dma_len(sg) = size + head;

		} else if (i == (num - 1)) {

			sg->offset = head + size * i;

			sg->offset = sg->offset * (*bpw / 8);

			sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem,

				    sg->offset);

			sg_dma_len(sg) = rem;

		} else {

			sg->offset = rem + size * (i - 1);

			sg->offset = head + size * i;

			sg->offset = sg->offset * (*bpw / 8);

			sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size,

				    sg->offset);
@@ -1204,6 +1237,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) 
				    data->current_msg->spi->bits_per_word);

	pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);

	do {

		int cnt;

		/* If we are already processing a message get the next

		transfer structure from the message otherwise retrieve

		the 1st transfer request from the message. */
@@ -1223,11 +1257,20 @@ static void pch_spi_process_messages(struct work_struct *pwork) 
		}

		spin_unlock(&data->lock);



		if (!data->cur_trans->len)

			goto out;

		cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;

		data->save_total_len = data->cur_trans->len;

		if (data->use_dma) {

			int i;

			char *save_rx_buf = data->cur_trans->rx_buf;

			for (i = 0; i < cnt; i ++) {

				pch_spi_handle_dma(data, &bpw);

				if (!pch_spi_start_transfer(data))

					goto out;

				pch_spi_copy_rx_data_for_dma(data, bpw);

			}

			data->cur_trans->rx_buf = save_rx_buf;

		} else {

			pch_spi_set_tx(data, &bpw);

			pch_spi_set_ir(data);
@@ -1238,6 +1281,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) 
			data->pkt_tx_buff = NULL;

		}

		/* increment message count */

		data->cur_trans->len = data->save_total_len;

		data->current_msg->actual_length += data->cur_trans->len;



		dev_dbg(&data->master->dev,

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