From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964892AbdCJN1Q (ORCPT ); Fri, 10 Mar 2017 08:27:16 -0500 Received: from mail-wr0-f196.google.com ([209.85.128.196]:33753 "EHLO mail-wr0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937074AbdCJNZ1 (ORCPT ); Fri, 10 Mar 2017 08:25:27 -0500 From: Jan Glauber To: Ulf Hansson Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, David Daney , "Steven J . Hill" , Jan Glauber Subject: [PATCH v12 8/9] mmc: cavium: Support DDR mode for eMMC devices Date: Fri, 10 Mar 2017 14:25:06 +0100 Message-Id: <20170310132507.32025-9-jglauber@cavium.com> X-Mailer: git-send-email 2.9.0.rc0.21.g7777322 In-Reply-To: <20170310132507.32025-1-jglauber@cavium.com> References: <20170310132507.32025-1-jglauber@cavium.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for switching to DDR mode for eMMC devices. Signed-off-by: Jan Glauber --- drivers/mmc/host/cavium-mmc.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/cavium-mmc.c b/drivers/mmc/host/cavium-mmc.c index fb6e1c1..e340b95 100644 --- a/drivers/mmc/host/cavium-mmc.c +++ b/drivers/mmc/host/cavium-mmc.c @@ -865,6 +865,10 @@ 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; + slot->bus_width = bus_width; /* Change the clock frequency. */ @@ -1057,8 +1061,14 @@ 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