linux-kernel - [PATCH] mmc: atmel-mci: enable 8 bits buswidth support

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Message-ID: <20190129164950.31052-1-nicolas.ferre@microchip.com>
Date:   Tue, 29 Jan 2019 17:49:12 +0100
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>
CC:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-mmc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] 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@...rochip.com>
---
 drivers/mmc/host/atmel-mci.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 47189f9ed4e2..735aa5871358 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1410,6 +1410,9 @@ 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) {
@@ -2275,8 +2278,11 @@ 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;
-- 
2.17.1