From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Belloni Subject: Re: [PATCH] mmc: atmel-mci: enable 8 bits buswidth support Date: Tue, 29 Jan 2019 21:12:39 +0100 Message-ID: <20190129201239.GC19959@piout.net> References: <20190129164950.31052-1-nicolas.ferre@microchip.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20190129164950.31052-1-nicolas.ferre@microchip.com> Sender: linux-kernel-owner@vger.kernel.org To: Nicolas Ferre Cc: Ludovic Desroches , Ulf Hansson , linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: linux-mmc@vger.kernel.org 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 Reviewed-by: Alexandre Belloni > --- > 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