From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: [PATCH 2/3] mmc: core: export functions for setting bus width. Date: Wed, 28 Jan 2015 10:35:24 +1100 Message-ID: <20150127233524.32160.48364.stgit@notabene.brown> References: <20150127233118.32160.11899.stgit@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150127233118.32160.11899.stgit@notabene.brown> Sender: linux-kernel-owner@vger.kernel.org To: Tony Lindgren , Ulf Hansson Cc: Andreas Fenkart , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, GTA04 owners , NeilBrown , linux-omap@vger.kernel.org List-Id: linux-mmc@vger.kernel.org It is not safe for a host to turn off clocks while expecting an SD card interrupt unless it first places the bus in 1-bit mode. To allow hosts to do this, export functions necessary for changing bus width. Signed-off-by: NeilBrown --- drivers/mmc/core/core.c | 1 + drivers/mmc/core/sdio.c | 8 ++++---- include/linux/mmc/host.h | 4 ++++ 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 7162ada24a24..418dd8ec36f8 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1099,6 +1099,7 @@ void mmc_set_bus_width(struct mmc_host *host, unsigned int width) mmc_set_ios(host); mmc_host_clk_release(host); } +EXPORT_SYMBOL(mmc_set_bus_width); /* * Set initial state after a power cycle or a hw_reset. diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index fd0750b5a634..128bbf10ae98 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -257,7 +257,7 @@ static int sdio_disable_cd(struct mmc_card *card) * Devices that remain active during a system suspend are * put back into 1-bit mode. */ -static int sdio_disable_wide(struct mmc_card *card) +int sdio_disable_wide(struct mmc_card *card) { int ret; u8 ctrl; @@ -286,9 +286,9 @@ static int sdio_disable_wide(struct mmc_card *card) return 0; } +EXPORT_SYMBOL(sdio_disable_wide); - -static int sdio_enable_4bit_bus(struct mmc_card *card) +int sdio_enable_4bit_bus(struct mmc_card *card) { int err; @@ -309,7 +309,7 @@ static int sdio_enable_4bit_bus(struct mmc_card *card) return err; } - +EXPORT_SYMBOL(sdio_enable_4bit_bus); /* * Test if the card supports high-speed mode and, if so, switch to it. diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index b6bf718c3498..822a02528c91 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -517,4 +517,8 @@ static inline bool mmc_card_hs400(struct mmc_card *card) return card->host->ios.timing == MMC_TIMING_MMC_HS400; } +int sdio_disable_wide(struct mmc_card *card); +int sdio_enable_4bit_bus(struct mmc_card *card); +void mmc_set_bus_width(struct mmc_host *host, unsigned int width); + #endif /* LINUX_MMC_HOST_H */