From: Nicolas Ferre <nicolas.ferre@microchip.com>
To: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
<linux-mmc@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH] mmc: atmel-mci: enable 8 bits buswidth support
Date: Tue, 29 Jan 2019 17:49:12 +0100 [thread overview]
Message-ID: <20190129164950.31052-1-nicolas.ferre@microchip.com> (raw)
This patch adds support for 8-bit buswidth.
Relevant SDCR value modified.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.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
next reply other threads:[~2019-01-29 16:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-29 16:49 Nicolas Ferre [this message]
2019-01-29 20:12 ` Alexandre Belloni
2019-01-30 9:20 ` Ulf Hansson
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