spi: atmel-quadspi: fix resume call

The flash remained in an undefined state, returning 0xFFs.
Fix it by setting the Serial Clock Baud Rate, as it was set
before the conversion to SPIMEM.

Tested with sama5d2_xplained and mx25l25673g spi-nor in
Backup + Self-Refresh and Suspend modes.

Fixes: 0e6aae0 ("spi: Add QuadSPI driver for Atmel SAMA5D2")
Reported-by: Mark Deneen <mdeneen@gmail.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
[claudiu.beznea@microchip.com: adapt to current code base]
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Author: ambarus

drivers/spi/atmel-quadspi.c

@@ -155,6 +155,7 @@ struct atmel_qspi {
 	struct clk		*clk;
 	struct platform_device	*pdev;
 	u32			pending;
+	u32			scr;
 	struct completion	cmd_completion;
 };
 
@@ -353,7 +354,7 @@ static int atmel_qspi_setup(struct spi_device *spi)
 	struct spi_controller *ctrl = spi->master;
 	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 	unsigned long src_rate;
-	u32 scr, scbr;
+	u32 scbr;
 
 	if (ctrl->busy)
 		return -EBUSY;
@@ -370,8 +371,8 @@ static int atmel_qspi_setup(struct spi_device *spi)
 	if (scbr > 0)
 		scbr--;
 
-	scr = QSPI_SCR_SCBR(scbr);
-	qspi_writel(aq, QSPI_SCR, scr);
+	aq->scr = QSPI_SCR_SCBR(scbr);
+	writel_relaxed(aq->scr, aq->regs + QSPI_SCR);
 
 	return 0;
 }
@@ -516,6 +517,9 @@ static int __maybe_unused atmel_qspi_resume(struct device *dev)
 	clk_prepare_enable(aq->clk);
 
 	atmel_qspi_init(aq);
+
+	writel_relaxed(aq->scr, aq->regs + QSPI_SCR);
+
 	return 0;
 }