From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Glauber Subject: [PATCH v13 5/6] mmc: cavium: Support DDR mode for eMMC devices Date: Thu, 30 Mar 2017 17:31:27 +0200 Message-ID: <20170330153128.22842-6-jglauber@cavium.com> References: <20170330153128.22842-1-jglauber@cavium.com> Return-path: In-Reply-To: <20170330153128.22842-1-jglauber@cavium.com> Sender: linux-kernel-owner@vger.kernel.org To: Ulf Hansson Cc: David Daney , "Steven J . Hill" , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Jan Glauber List-Id: linux-mmc@vger.kernel.org Add support for switching to DDR mode for eMMC devices. Signed-off-by: Jan Glauber --- drivers/mmc/host/cavium.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c index eebb387..d842b69 100644 --- a/drivers/mmc/host/cavium.c +++ b/drivers/mmc/host/cavium.c @@ -864,6 +864,10 @@ static void cvm_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) break; } + /* DDR is available for 4/8 bit bus width */ + if (ios->bus_width && ios->timing == MMC_TIMING_MMC_DDR52) + bus_width |= 4; + /* Change the clock frequency. */ clock = ios->clock; if (clock > 52000000) @@ -1032,8 +1036,14 @@ int cvm_mmc_of_slot_probe(struct device *dev, struct cvm_mmc_host *host) /* Set up host parameters */ mmc->ops = &cvm_mmc_ops; + /* + * We only have a 3.3v supply, we cannot support any + * of the UHS modes. We do support the high speed DDR + * modes up to 52MHz. + */ mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED | - MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_POWER_OFF_CARD; + MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_POWER_OFF_CARD | + MMC_CAP_3_3V_DDR; if (host->use_sg) mmc->max_segs = 16; -- 2.9.0.rc0.21.g7777322