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SubjectRe: [PATCH] mmc: atmel-mci: enable 8 bits buswidth support
On 29/01/2019 17:49:12+0100, Nicolas Ferre wrote:
> 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>

> ---
> 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
>

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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