mtd: spi-nor: Merge spi_nor_write_sr() and spi_nor_write_sr_cr()

Merge
static int spi_nor_write_sr(struct spi_nor *nor, u8 val)
static int spi_nor_write_sr_cr(struct spi_nor *nor, const u8 *sr_cr)
into
static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)

The Status Register can be written with one or two bytes. Merge
the two functions to avoid code duplication.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>

drivers/mtd/spi-nor/spi-nor.c

@@ -824,16 +824,18 @@ static int spi_nor_wait_till_ready(struct spi_nor *nor)
 						    DEFAULT_READY_WAIT_JIFFIES);
 }
 
-/*
- * Write status register 1 byte
- * Returns negative if error occurred.
+/**
+ * spi_nor_write_sr() - Write the Status Register.
+ * @nor:	pointer to 'struct spi_nor'.
+ * @sr:		pointer to DMA-able buffer to write to the Status Register.
+ * @len:	number of bytes to write to the Status Register.
+ *
+ * Return: 0 on success, -errno otherwise.
  */
-static int spi_nor_write_sr(struct spi_nor *nor, u8 val)
+static int spi_nor_write_sr(struct spi_nor *nor, const u8 *sr, size_t len)
 {
 	int ret;
 
-	nor->bouncebuf[0] = val;
-
 	ret = spi_nor_write_enable(nor);
 	if (ret)
 		return ret;
@@ -843,12 +845,12 @@ static int spi_nor_write_sr(struct spi_nor *nor, u8 val)
 			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
 				   SPI_MEM_OP_NO_ADDR,
 				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
+				   SPI_MEM_OP_DATA_OUT(len, sr, 1));
 
 		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
 		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR,
-						     nor->bouncebuf, 1);
+						     sr, len);
 	}
 
 	if (ret) {
@@ -859,49 +861,15 @@ static int spi_nor_write_sr(struct spi_nor *nor, u8 val)
 	return spi_nor_wait_till_ready(nor);
 }
 
-/*
- * Write status Register and configuration register with 2 bytes
- * The first byte will be written to the status register, while the
- * second byte will be written to the configuration register.
- * Return negative if error occurred.
- */
-static int spi_nor_write_sr_cr(struct spi_nor *nor, const u8 *sr_cr)
-{
-	int ret;
-
-	ret = spi_nor_write_enable(nor);
-	if (ret)
-		return ret;
-
-	if (nor->spimem) {
-		struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
-				   SPI_MEM_OP_NO_ADDR,
-				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_OUT(2, sr_cr, 1));
-
-		ret = spi_mem_exec_op(nor->spimem, &op);
-	} else {
-		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WRSR,
-						     sr_cr, 2);
-	}
-
-	if (ret) {
-		dev_dbg(nor->dev,
-			"error while writing configuration register\n");
-		return -EINVAL;
-	}
-
-	return spi_nor_wait_till_ready(nor);
-}
-
 /* Write status register and ensure bits in mask match written values */
 static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new,
 				      u8 mask)
 {
 	int ret;
 
-	ret = spi_nor_write_sr(nor, status_new);
+	nor->bouncebuf[0] = status_new;
+
+	ret = spi_nor_write_sr(nor, nor->bouncebuf, 1);
 	if (ret)
 		return ret;
 
@@ -1868,7 +1836,9 @@ static int macronix_quad_enable(struct spi_nor *nor)
 	if (nor->bouncebuf[0] & SR_QUAD_EN_MX)
 		return 0;
 
-	ret = spi_nor_write_sr(nor, nor->bouncebuf[0] | SR_QUAD_EN_MX);
+	nor->bouncebuf[0] |= SR_QUAD_EN_MX;
+
+	ret = spi_nor_write_sr(nor, nor->bouncebuf, 1);
 	if (ret)
 		return ret;
 
@@ -1915,7 +1885,7 @@ static int spansion_quad_enable(struct spi_nor *nor)
 
 	sr_cr[0] = 0;
 	sr_cr[1] = CR_QUAD_EN_SPAN;
-	ret = spi_nor_write_sr_cr(nor, sr_cr);
+	ret = spi_nor_write_sr(nor, sr_cr, 2);
 	if (ret)
 		return ret;
 
@@ -1957,7 +1927,7 @@ static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)
 
 	sr_cr[1] = CR_QUAD_EN_SPAN;
 
-	return spi_nor_write_sr_cr(nor, sr_cr);
+	return spi_nor_write_sr(nor, sr_cr, 2);
 }
 
 /**
@@ -1993,7 +1963,7 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
 	if (ret)
 		return ret;
 
-	ret = spi_nor_write_sr_cr(nor, sr_cr);
+	ret = spi_nor_write_sr(nor, sr_cr, 2);
 	if (ret)
 		return ret;
 
@@ -2072,7 +2042,9 @@ static int spi_nor_clear_sr_bp(struct spi_nor *nor)
 	if (ret)
 		return ret;
 
-	return spi_nor_write_sr(nor, nor->bouncebuf[0] & ~mask);
+	nor->bouncebuf[0] &= ~mask;
+
+	return spi_nor_write_sr(nor, nor->bouncebuf, 1);
 }
 
 /**
@@ -2110,7 +2082,7 @@ static int spi_nor_spansion_clear_sr_bp(struct spi_nor *nor)
 
 		sr_cr[0] &= ~mask;
 
-		return spi_nor_write_sr_cr(nor, sr_cr);
+		return spi_nor_write_sr(nor, sr_cr, 2);
 	}
 
 	/*