MMC: S3C24XX: Update error debugging.

Add better debugging to show where errors are being
generated, as some error codes can come from several
different code paths.

Also fix the error return path from s3cmci_setup_data()
to return the error it returned to the request.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/s3cmci.c

@@ -450,6 +450,7 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 	}
 
 	if (mci_csta & S3C2410_SDICMDSTAT_CMDTIMEOUT) {
+		dbg(host, dbg_err, "CMDSTAT: error CMDTIMEOUT\n");
 		cmd->error = -ETIMEDOUT;
 		host->status = "error: command timeout";
 		goto fail_transfer;
@@ -505,12 +506,14 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 	/* Check for FIFO failure */
 	if (host->is2440) {
 		if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
+			dbg(host, dbg_err, "FIFO failure\n");
 			host->mrq->data->error = -EILSEQ;
 			host->status = "error: 2440 fifo failure";
 			goto fail_transfer;
 		}
 	} else {
 		if (mci_dsta & S3C2410_SDIDSTA_FIFOFAIL) {
+			dbg(host, dbg_err, "FIFO failure\n");
 			cmd->data->error = -EILSEQ;
 			host->status = "error:  fifo failure";
 			goto fail_transfer;
@@ -518,18 +521,21 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 	}
 
 	if (mci_dsta & S3C2410_SDIDSTA_RXCRCFAIL) {
+		dbg(host, dbg_err, "bad data crc (outgoing)\n");
 		cmd->data->error = -EILSEQ;
 		host->status = "error: bad data crc (outgoing)";
 		goto fail_transfer;
 	}
 
 	if (mci_dsta & S3C2410_SDIDSTA_CRCFAIL) {
+		dbg(host, dbg_err, "bad data crc (incoming)\n");
 		cmd->data->error = -EILSEQ;
 		host->status = "error: bad data crc (incoming)";
 		goto fail_transfer;
 	}
 
 	if (mci_dsta & S3C2410_SDIDSTA_DATATIMEOUT) {
+		dbg(host, dbg_err, "data timeout\n");
 		cmd->data->error = -ETIMEDOUT;
 		host->status = "error: data timeout";
 		goto fail_transfer;
@@ -956,8 +962,9 @@ static void s3cmci_send_request(struct mmc_host *mmc)
 		host->dcnt++;
 
 		if (res) {
-			cmd->error = -EINVAL;
-			cmd->data->error = -EINVAL;
+			dbg(host, dbg_err, "setup data error %d\n", res);
+			cmd->error = res;
+			cmd->data->error = res;
 
 			mmc_request_done(mmc, mrq);
 			return;
@@ -969,6 +976,7 @@ static void s3cmci_send_request(struct mmc_host *mmc)
 			res = s3cmci_prepare_pio(host, cmd->data);
 
 		if (res) {
+			dbg(host, dbg_err, "data prepare error %d\n", res);
 			cmd->error = res;
 			cmd->data->error = res;