spi/rockchip: cleanup some coding issues and uncessary output

Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Addy Ke <addy.ke@rockchip.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-rockchip.c

 /*
  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
- * Author: addy ke <addy.ke@rock-chips.com>
+ * Author: Addy Ke <addy.ke@rock-chips.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -186,7 +186,7 @@ struct rockchip_spi {
 	void *rx_end;
 
 	u32 state;
-
+	/* protect state */
 	spinlock_t lock;
 
 	struct completion xfer_completion;
@@ -278,7 +278,7 @@ static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
 }
 
 static int rockchip_spi_prepare_message(struct spi_master *master,
-		struct spi_message *msg)
+					struct spi_message *msg)
 {
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 	struct spi_device *spi = msg->spi;
@@ -294,13 +294,19 @@ static int rockchip_spi_prepare_message(struct spi_master *master,
 }
 
 static int rockchip_spi_unprepare_message(struct spi_master *master,
-		struct spi_message *msg)
+					  struct spi_message *msg)
 {
 	unsigned long flags;
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
 	spin_lock_irqsave(&rs->lock, flags);
 
+	/*
+	 * For DMA mode, we need terminate DMA channel and flush
+	 * fifo for the next transfer if DMA thansfer timeout.
+	 * unprepare_message() was called by core if transfer complete
+	 * or timeout. Maybe it is reasonable for error handling here.
+	 */
 	if (rs->use_dma) {
 		if (rs->state & RXBUSY) {
 			dmaengine_terminate_all(rs->dma_rx.ch);
@@ -344,7 +350,7 @@ static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
 		else
 			*(u16 *)(rs->rx) = (u16)rxw;
 		rs->rx += rs->n_bytes;
-	};
+	}
 }
 
 static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
@@ -414,7 +420,8 @@ static int rockchip_spi_dma_transfer(struct rockchip_spi *rs)
 		rxconf.src_maxburst = rs->n_bytes;
 		dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
 
-		rxdesc = dmaengine_prep_slave_sg(rs->dma_rx.ch,
+		rxdesc = dmaengine_prep_slave_sg(
+				rs->dma_rx.ch,
 				rs->rx_sg.sgl, rs->rx_sg.nents,
 				rs->dma_rx.direction, DMA_PREP_INTERRUPT);
 
@@ -429,7 +436,8 @@ static int rockchip_spi_dma_transfer(struct rockchip_spi *rs)
 		txconf.dst_maxburst = rs->n_bytes;
 		dmaengine_slave_config(rs->dma_tx.ch, &txconf);
 
-		txdesc = dmaengine_prep_slave_sg(rs->dma_tx.ch,
+		txdesc = dmaengine_prep_slave_sg(
+				rs->dma_tx.ch,
 				rs->tx_sg.sgl, rs->tx_sg.nents,
 				rs->dma_tx.direction, DMA_PREP_INTERRUPT);
 
@@ -495,13 +503,13 @@ static void rockchip_spi_config(struct rockchip_spi *rs)
 
 	spi_set_clk(rs, div);
 
-	dev_dbg(rs->dev, "cr0 0x%x, div %d\n",
-			cr0, div);
+	dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
 
 	spi_enable_chip(rs, 1);
 }
 
-static int rockchip_spi_transfer_one(struct spi_master *master,
+static int rockchip_spi_transfer_one(
+		struct spi_master *master,
 		struct spi_device *spi,
 		struct spi_transfer *xfer)
 {
@@ -556,8 +564,8 @@ static int rockchip_spi_transfer_one(struct spi_master *master,
 }
 
 static bool rockchip_spi_can_dma(struct spi_master *master,
-		struct spi_device *spi,
-		struct spi_transfer *xfer)
+				 struct spi_device *spi,
+				 struct spi_transfer *xfer)
 {
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
@@ -572,10 +580,9 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	struct resource *mem;
 
 	master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
-	if (!master) {
-		dev_err(&pdev->dev, "No memory for spi_master\n");
+	if (!master)
 		return -ENOMEM;
-	}
+
 	platform_set_drvdata(pdev, master);
 
 	rs = spi_master_get_devdata(master);
@@ -676,8 +683,6 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 		goto err_register_master;
 	}
 
-	dev_info(&pdev->dev, "Rockchip SPI controller initialized\n");
-
 	return 0;
 
 err_register_master:
@@ -817,6 +822,6 @@ static struct platform_driver rockchip_spi_driver = {
 
 module_platform_driver(rockchip_spi_driver);
 
-MODULE_AUTHOR("addy ke <addy.ke@rock-chips.com>");
+MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
 MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
 MODULE_LICENSE("GPL v2");