mmc: atmel-mci: enable 8 bits buswidth support

This patch adds support for 8-bit buswidth.
Relevant SDCR value modified.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: noglitch

drivers/mmc/host/atmel-mci.c

@@ -1431,6 +1431,9 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	case MMC_BUS_WIDTH_4:
 		slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
 		break;
+	case MMC_BUS_WIDTH_8:
+		slot->sdc_reg |= ATMCI_SDCBUS_8BIT;
+		break;
 	}
 
 	if (ios->clock) {
@@ -2298,8 +2301,11 @@ static int atmci_init_slot(struct atmel_mci *host,
 	 * use only one bit for data to prevent fifo underruns and overruns
 	 * which will corrupt data.
 	 */
-	if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
+	if ((slot_data->bus_width >= 4) && host->caps.has_rwproof) {
 		mmc->caps |= MMC_CAP_4_BIT_DATA;
+		if (slot_data->bus_width >= 8)
+			mmc->caps |= MMC_CAP_8_BIT_DATA;
+	}
 
 	if (atmci_get_version(host) < 0x200) {
 		mmc->max_segs = 256;