spi-topcliff-pch: Fix CPU read complete condition issue

We found Rx data sometimes drops.(with non-DMA transfer mode)
The cause is read complete condition is not true.

This patch fixes the issue.
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/spi-topcliff-pch.c

@@ -317,16 +317,19 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
 
 	/* if transfer complete interrupt */
 	if (reg_spsr_val & SPSR_FI_BIT) {
-		if (tx_index < bpw_len)
-			dev_err(&data->master->dev,
-				"%s : Transfer is not completed", __func__);
+		if ((tx_index == bpw_len) && (rx_index == tx_index)) {
 			/* disable interrupts */
 			pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
 
-		/* transfer is completed;inform pch_spi_process_messages */
+			/* transfer is completed;
+			   inform pch_spi_process_messages */
 			data->transfer_complete = true;
 			data->transfer_active = false;
 			wake_up(&data->wait);
+		} else {
+			dev_err(&data->master->dev,
+				"%s : Transfer is not completed", __func__);
+		}
 	}
 }