mtd: spi-nor: Fix the disabling of write protection at init

spi_nor_spansion_clear_sr_bp() depends on spansion_quad_enable().
While spansion_quad_enable() is selected as default when
initializing the flash parameters, the nor->quad_enable() method
can be overwritten later on when parsing BFPT.

Select the write protection disable mechanism at spi_nor_init() time,
when the nor->quad_enable() method is already known.

Fixes: 191f5c2e ("mtd: spi-nor: use 16-bit WRR command when QE is set on spansion flashes")
Signed-off-by: NTudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: NVignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: NRichard Weinberger <richard@nod.at>

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

@@ -3780,8 +3780,6 @@ static int spi_nor_init_params(struct spi_nor *nor,
 		default:
 			/* Kept only for backward compatibility purpose. */
 			params->quad_enable = spansion_quad_enable;
-			if (nor->clear_sr_bp)
-				nor->clear_sr_bp = spi_nor_spansion_clear_sr_bp;
 			break;
 		}
 
@@ -4035,6 +4033,9 @@ static int spi_nor_init(struct spi_nor *nor)
 	int err;
 
 	if (nor->clear_sr_bp) {
+		if (nor->quad_enable == spansion_quad_enable)
+			nor->clear_sr_bp = spi_nor_spansion_clear_sr_bp;
+
 		err = nor->clear_sr_bp(nor);
 		if (err) {
 			dev_err(nor->dev,