From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory CLEMENT Subject: [PATCH 05/12] mmc: sdhci: add a pre voltage switch callback function Date: Thu, 9 Jun 2016 09:10:11 +0200 Message-ID: <1465456218-28354-6-git-send-email-gregory.clement@free-electrons.com> References: <1465456218-28354-1-git-send-email-gregory.clement@free-electrons.com> Return-path: In-Reply-To: <1465456218-28354-1-git-send-email-gregory.clement@free-electrons.com> Sender: linux-mmc-owner@vger.kernel.org To: Ulf Hansson , Adrian Hunter , linux-mmc@vger.kernel.org Cc: Rob Herring , devicetree@vger.kernel.org, Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory CLEMENT , Thomas Petazzoni , linux-arm-kernel@lists.infradead.org, Nadav Haklai , Victor Gu , Romain Perier , Omri Itach , Marcin Wojtas , Wilson Ding , Shadi Ammouri List-Id: devicetree@vger.kernel.org From: Victor Gu Some host controller such as Xenon needs additional setting when switching signal voltage in eMMC mode. They also need to re-enable internal clock before a voltage switch. This commit adds a callback routine "voltage_switch_pre" in the struct sdhci_ops, which is used by some host controllers which need re-enable the internal clock before a voltage switch. [gregory.clement@free-electrons.com: split the initial commit and reformulate the log] Signed-off-by: Victor Gu Signed-off-by: Marcin Wojtas Signed-off-by: Gregory CLEMENT --- drivers/mmc/host/sdhci.c | 4 ++++ drivers/mmc/host/sdhci.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index b07219426d39..cad03ffa9d9b 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1729,6 +1729,10 @@ static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, if (host->version < SDHCI_SPEC_300) return 0; + /* Some controller need to do more before switching */ + if (host->ops->voltage_switch_pre) + host->ops->voltage_switch_pre(host); + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); switch (ios->signal_voltage) { diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 49c6c5b0e33b..6bec1b0368d2 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -550,6 +550,7 @@ struct sdhci_ops { unsigned int max_dtr, int host_drv, int card_drv, int *drv_type); void (*init_card)(struct sdhci_host *host, struct mmc_card *card); + void (*voltage_switch_pre)(struct sdhci_host *host); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS -- 2.5.0