mmc: atmel-mci: use ATMEL_PDC_SCND_BUF_OFF instead of a literal value

Signed-off-by: Ludovic Desroches <[e-mail]>
Signed-off-by: Nicolas Ferre <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/atmel-mci.c

···
 	}
 
 	if (buf_nb == PDC_SECOND_BUF) {
-		pointer_reg += 0x10;
-		counter_reg += 0x10;
+		pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
+		counter_reg += ATMEL_PDC_SCND_BUF_OFF;
 	}
 
 	atmci_writel(host, pointer_reg, sg_dma_address(host->sg));

include/linux/atmel_pdc.h

···
 
 #define ATMEL_PDC_PTSR		0x124	/* Transfer Status Register */
 
+#define ATMEL_PDC_SCND_BUF_OFF	0x10	/* Offset between first and second buffer registers */
+
 #endif