From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johan Rudholm Subject: [PATCH v2 4/4] mmc: sd: add hw_reset callback Date: Tue, 4 Nov 2014 16:07:06 +0100 Message-ID: <1415113626-30187-5-git-send-email-johanru@axis.com> References: <1415113626-30187-1-git-send-email-johanru@axis.com> Return-path: Received: from bastet.se.axis.com ([195.60.68.11]:44131 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753808AbaKDPHZ (ORCPT ); Tue, 4 Nov 2014 10:07:25 -0500 In-Reply-To: <1415113626-30187-1-git-send-email-johanru@axis.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org, Chris Ball , Ulf Hansson Cc: Adrian Hunter , Guennadi Liakhovetski , =?UTF-8?q?David=20Lanzend=C3=B6rfer?= , Jesper Nilsson , Johan Rudholm Enable power cycle and re-initialization of SD cards via the hw_reset bus_ops. Power cycling a buggy SD card sometimes helps it get back on track. Signed-off-by: Johan Rudholm --- drivers/mmc/core/sd.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 0c44510..383320e 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -1177,6 +1177,18 @@ static int mmc_sd_runtime_resume(struct mmc_host *host) return 0; } +static int mmc_sd_hw_reset(struct mmc_host *host, int test) +{ + struct mmc_card *card = host->card; + + if (test == MMC_HW_RESET_TEST) + return 0; + + mmc_power_cycle(host, card->ocr); + + return 0; +} + static int mmc_sd_power_restore(struct mmc_host *host) { int ret; @@ -1198,6 +1210,7 @@ static const struct mmc_bus_ops mmc_sd_ops = { .power_restore = mmc_sd_power_restore, .alive = mmc_sd_alive, .shutdown = mmc_sd_suspend, + .hw_reset = mmc_sd_hw_reset, }; /* -- 1.7.2.5