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Commit e352c813 authored by Seungwon Jeon's avatar Seungwon Jeon Committed by Chris Ball
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mmc: dw_mmc: rework the code related to cmd/data completion 



Main change corresponds to dw_mci_command_complete().  And EBE is
divided into read and write.  Some minor changes for code readability.

Signed-off-by: default avatarSeungwon Jeon <tgih.jun@samsung.com>
Tested-by: default avatarAlim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 90c2143a

drivers/mmc/host/dw_mmc.c

+84 −63
Original line number Diff line number Diff line
@@ -845,7 +845,9 @@ static void __dw_mci_start_request(struct dw_mci *host, 


	host->pending_events = 0;

	host->completed_events = 0;

	host->cmd_status = 0;

	host->data_status = 0;

	host->dir_status = 0;



	data = cmd->data;

	if (data) {
@@ -1157,7 +1159,7 @@ static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq) 
	spin_lock(&host->lock);

}



static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)

static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)

{

	u32 status = host->cmd_status;
@@ -1192,6 +1194,57 @@ static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd 
		if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)

			mdelay(20);

	}



	return cmd->error;

}



static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)

{

	u32 status = host->data_status, ctrl;



	if (status & DW_MCI_DATA_ERROR_FLAGS) {

		if (status & SDMMC_INT_DRTO) {

			data->error = -ETIMEDOUT;

		} else if (status & SDMMC_INT_DCRC) {

			data->error = -EILSEQ;

		} else if (status & SDMMC_INT_EBE) {

			if (host->dir_status ==

				DW_MCI_SEND_STATUS) {

				/*

				 * No data CRC status was returned.

				 * The number of bytes transferred

				 * will be exaggerated in PIO mode.

				 */

				data->bytes_xfered = 0;

				data->error = -ETIMEDOUT;

			} else if (host->dir_status ==

					DW_MCI_RECV_STATUS) {

				data->error = -EIO;

			}

		} else {

			/* SDMMC_INT_SBE is included */

			data->error = -EIO;

		}



		dev_err(host->dev, "data error, status 0x%08x\n", status);



		/*

		 * After an error, there may be data lingering

		 * in the FIFO, so reset it - doing so

		 * generates a block interrupt, hence setting

		 * the scatter-gather pointer to NULL.

		 */

		sg_miter_stop(&host->sg_miter);

		host->sg = NULL;

		ctrl = mci_readl(host, CTRL);

		ctrl |= SDMMC_CTRL_FIFO_RESET;

		mci_writel(host, CTRL, ctrl);

	} else {

		data->bytes_xfered = data->blocks * data->blksz;

		data->error = 0;

	}



	return data->error;

}



static void dw_mci_tasklet_func(unsigned long priv)
@@ -1199,14 +1252,17 @@ static void dw_mci_tasklet_func(unsigned long priv) 
	struct dw_mci *host = (struct dw_mci *)priv;

	struct mmc_data	*data;

	struct mmc_command *cmd;

	struct mmc_request *mrq;

	enum dw_mci_state state;

	enum dw_mci_state prev_state;

	u32 status, ctrl;

	u32 ctrl;

	unsigned int err;



	spin_lock(&host->lock);



	state = host->state;

	data = host->data;

	mrq = host->mrq;



	do {

		prev_state = state;
@@ -1223,23 +1279,23 @@ static void dw_mci_tasklet_func(unsigned long priv) 
			cmd = host->cmd;

			host->cmd = NULL;

			set_bit(EVENT_CMD_COMPLETE, &host->completed_events);

			dw_mci_command_complete(host, cmd);

			if (cmd == host->mrq->sbc && !cmd->error) {

			err = dw_mci_command_complete(host, cmd);

			if (cmd == mrq->sbc && !err) {

				prev_state = state = STATE_SENDING_CMD;

				__dw_mci_start_request(host, host->cur_slot,

						       host->mrq->cmd);

						       mrq->cmd);

				goto unlock;

			}



			if (cmd->data && cmd->error) {

			if (cmd->data && err) {

				dw_mci_stop_dma(host);

				send_stop_abort(host, data);

				state = STATE_SENDING_STOP;

				break;

			}



			if (!host->mrq->data || cmd->error) {

				dw_mci_request_end(host, host->mrq);

			if (!cmd->data || err) {

				dw_mci_request_end(host, mrq);

				goto unlock;

			}
@@ -1270,62 +1326,27 @@ static void dw_mci_tasklet_func(unsigned long priv) 


			host->data = NULL;

			set_bit(EVENT_DATA_COMPLETE, &host->completed_events);

			status = host->data_status;

			err = dw_mci_data_complete(host, data);



			if (status & DW_MCI_DATA_ERROR_FLAGS) {

				if (status & SDMMC_INT_DRTO) {

					data->error = -ETIMEDOUT;

				} else if (status & SDMMC_INT_DCRC) {

					data->error = -EILSEQ;

				} else if (status & SDMMC_INT_EBE &&

					   host->dir_status ==

							DW_MCI_SEND_STATUS) {

					/*

					 * No data CRC status was returned.

					 * The number of bytes transferred will

					 * be exaggerated in PIO mode.

					 */

					data->bytes_xfered = 0;

					data->error = -ETIMEDOUT;

				} else {

					dev_err(host->dev,

						"data FIFO error "

						"(status=%08x)\n",

						status);

					data->error = -EIO;

				}

				/*

				 * After an error, there may be data lingering

				 * in the FIFO, so reset it - doing so

				 * generates a block interrupt, hence setting

				 * the scatter-gather pointer to NULL.

				 */

				sg_miter_stop(&host->sg_miter);

				host->sg = NULL;

				ctrl = mci_readl(host, CTRL);

				ctrl |= SDMMC_CTRL_FIFO_RESET;

				mci_writel(host, CTRL, ctrl);

			} else {

				data->bytes_xfered = data->blocks * data->blksz;

				data->error = 0;

			}



			if (!data->stop && !data->error) {

				dw_mci_request_end(host, host->mrq);

				goto unlock;

			}



			if (host->mrq->sbc && !data->error) {

			if (!err) {

				if (!data->stop || mrq->sbc) {

					if (mrq->sbc)

						data->stop->error = 0;

				dw_mci_request_end(host, host->mrq);

					dw_mci_request_end(host, mrq);

					goto unlock;

				}



			prev_state = state = STATE_SENDING_STOP;

			if (data->stop && !data->error) {

				/* stop command for open-ended transfer*/

				if (data->stop)

					send_stop_abort(host, data);

			}



			/*

			 * If err has non-zero,

			 * stop-abort command has been already issued.

			 */

			prev_state = state = STATE_SENDING_STOP;



			/* fall through */



		case STATE_SENDING_STOP:
@@ -1334,7 +1355,7 @@ static void dw_mci_tasklet_func(unsigned long priv) 
				break;



			/* CMD error in data command */

			if (host->mrq->cmd->error && host->mrq->data) {

			if (mrq->cmd->error && mrq->data) {

				sg_miter_stop(&host->sg_miter);

				host->sg = NULL;

				ctrl = mci_readl(host, CTRL);
@@ -1345,12 +1366,12 @@ static void dw_mci_tasklet_func(unsigned long priv) 
			host->cmd = NULL;

			host->data = NULL;



			if (host->mrq->stop)

				dw_mci_command_complete(host, host->mrq->stop);

			if (mrq->stop)

				dw_mci_command_complete(host, mrq->stop);

			else

				host->cmd_status = 0;



			dw_mci_request_end(host, host->mrq);

			dw_mci_request_end(host, mrq);

			goto unlock;



		case STATE_DATA_ERROR: