From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1duhHK-00036u-5J for barebox@lists.infradead.org; Wed, 20 Sep 2017 15:51:12 +0000 From: Philipp Zabel Date: Wed, 20 Sep 2017 17:50:44 +0200 Message-Id: <20170920155044.1841-1-p.zabel@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH] mmc: allow skipping SD card initialization To: barebox@lists.infradead.org This patch allows to skip SD card initialization for eMMCs by setting the "no-sd" property in the host controller device tree node. Avoiding two SD command timeouts speeds up detection time by well over 200 ms. Signed-off-by: Philipp Zabel --- drivers/mci/mci-core.c | 12 ++++++++---- include/mci.h | 1 + 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c index 07911d43d..208b7666d 100644 --- a/drivers/mci/mci-core.c +++ b/drivers/mci/mci-core.c @@ -1682,10 +1682,13 @@ static int mci_card_probe(struct mci *mci) } /* Check if this card can handle the "SD Card Physical Layer Specification 2.0" */ - rc = sd_send_if_cond(mci); - rc = sd_send_op_cond(mci); - if (rc && rc == -ETIMEDOUT) { - /* If the command timed out, we check for an MMC card */ + if (!host->no_sd) { + rc = sd_send_if_cond(mci); + rc = sd_send_op_cond(mci); + } + if (host->no_sd || rc == -ETIMEDOUT) { + /* If SD card initialization was skipped or if it timed out, + * we check for an MMC card */ dev_dbg(&mci->dev, "Card seems to be a MultiMediaCard\n"); rc = mmc_send_op_cond(mci); } @@ -1904,6 +1907,7 @@ void mci_of_parse_node(struct mci_host *host, } host->non_removable = of_property_read_bool(np, "non-removable"); + host->no_sd = of_property_read_bool(np, "no-sd"); } void mci_of_parse(struct mci_host *host) diff --git a/include/mci.h b/include/mci.h index d3115e8cc..1f6533391 100644 --- a/include/mci.h +++ b/include/mci.h @@ -403,6 +403,7 @@ struct mci_host { unsigned dsr_val; /**< optional dsr value */ int use_dsr; /**< optional dsr usage flag */ bool non_removable; /**< device is non removable */ + bool no_sd; /**< do not send SD commands during initialization */ struct regulator *supply; /** init the host interface */ -- 2.11.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox