spi-nor: intel-spi: Remove the unnecessary HSFSTS register RW

There is no code that alters the HSFSTS register content in between
in intel_spi_write(). Remove the unnecessary RW to save some cycles.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>

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

@@ -611,7 +611,6 @@ static ssize_t intel_spi_write(struct spi_nor *nor, loff_t to, size_t len,
 		val |= HSFSTS_CTL_AEL | HSFSTS_CTL_FCERR | HSFSTS_CTL_FDONE;
 		val |= (block_size - 1) << HSFSTS_CTL_FDBC_SHIFT;
 		val |= HSFSTS_CTL_FCYCLE_WRITE;
-		writel(val, ispi->base + HSFSTS_CTL);
 
 		ret = intel_spi_write_block(ispi, write_buf, block_size);
 		if (ret) {
@@ -620,8 +619,8 @@ static ssize_t intel_spi_write(struct spi_nor *nor, loff_t to, size_t len,
 		}
 
 		/* Start the write now */
-		val = readl(ispi->base + HSFSTS_CTL);
-		writel(val | HSFSTS_CTL_FGO, ispi->base + HSFSTS_CTL);
+		val |= HSFSTS_CTL_FGO;
+		writel(val, ispi->base + HSFSTS_CTL);
 
 		ret = intel_spi_wait_hw_busy(ispi);
 		if (ret) {