[PATCH v2 0/2] set_ios handle vmmc

[PATCH v2 0/2] set_ios handle vmmc

[Zhangfei Gao]

v2: reuse vmmc

vmmc is controled inside set_ios according to mmc_power_up/down
Brownstone add support of sdio device 8787

Zhangfei Gao (2):
  mmc: sdhci move vmmc to set_ios
  ARM: mmp2: support sdio device 8787

 arch/arm/mach-mmp/brownstone.c |   60 ++++++++++++++++++++++++++++++++++++++-
 drivers/mmc/host/sdhci.c       |   27 ++++++++++--------
 include/linux/mmc/sdhci.h      |    1 +
 3 files changed, 74 insertions(+), 14 deletions(-)

[PATCH 1/2] mmc: sdhci move vmmc to set_ios

[Zhangfei Gao]

Move vmmc to set_ios, as a result mmc_power_up/down handles regulator_enable/disable vmmc
Move regulator outof spin_lock, since usually i2c operation is called
Remove vmmc from suspend/resume function, instead vmmc is handled properly in mmc_suspend/resume_host according to mmc_card_keep_power

CC: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Zhangfei Gao <zhangfei.gao@marvell.com>
---
 drivers/mmc/host/sdhci.c  |   27 +++++++++++++++------------
 include/linux/mmc/sdhci.h |    1 +
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c31a334..ce4f97f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1279,6 +1279,13 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
 	host = mmc_priv(mmc);
 
+	if (host->vmmc) {
+		if (ios->power_mode != host->power_mode_old) {
+			if (ios->power_mode == MMC_POWER_UP)
+				regulator_enable(host->vmmc);
+		}
+	}
+
 	spin_lock_irqsave(&host->lock, flags);
 
 	if (host->flags & SDHCI_DEVICE_DEAD)
@@ -1426,6 +1433,14 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 out:
 	mmiowb();
 	spin_unlock_irqrestore(&host->lock, flags);
+
+	if (host->vmmc) {
+		if (ios->power_mode != host->power_mode_old) {
+			if (ios->power_mode == MMC_POWER_OFF)
+				regulator_disable(host->vmmc);
+		}
+		host->power_mode_old = ios->power_mode;
+	}
 }
 
 static int check_ro(struct sdhci_host *host)
@@ -2262,9 +2277,6 @@ int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
 
 	free_irq(host->irq, host);
 
-	if (host->vmmc)
-		ret = regulator_disable(host->vmmc);
-
 	return ret;
 }
 
@@ -2274,13 +2286,6 @@ int sdhci_resume_host(struct sdhci_host *host)
 {
 	int ret;
 
-	if (host->vmmc) {
-		int ret = regulator_enable(host->vmmc);
-		if (ret)
-			return ret;
-	}
-
-
 	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
 		if (host->ops->enable_dma)
 			host->ops->enable_dma(host);
@@ -2749,8 +2754,6 @@ int sdhci_add_host(struct sdhci_host *host)
 	if (IS_ERR(host->vmmc)) {
 		printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
 		host->vmmc = NULL;
-	} else {
-		regulator_enable(host->vmmc);
 	}
 
 	sdhci_init(host, 0);
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 5666f3a..2e6e711 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -94,6 +94,7 @@ struct sdhci_host {
 	const struct sdhci_ops *ops;	/* Low level hw interface */
 
 	struct regulator *vmmc;	/* Power regulator */
+	unsigned char power_mode_old;	/* power supply mode */
 
 	/* Internal data */
 	struct mmc_host *mmc;	/* MMC structure */
-- 
1.7.0.4

[PATCH 1/2] mmc: sdhci move vmmc to set_ios

[zhangfei gao]

On Tue, Jul 26, 2011 at 3:06 PM, Zhangfei Gao <zhangfei.gao@marvell.com> wrote:
> Move vmmc to set_ios, as a result mmc_power_up/down handles regulator_enable/disable vmmc
> Move regulator outof spin_lock, since usually i2c operation is called
> Remove vmmc from suspend/resume function, instead vmmc is handled properly in mmc_suspend/resume_host according to mmc_card_keep_power
>
> CC: Ohad Ben-Cohen <ohad@wizery.com>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@marvell.com>
> ---
> ?drivers/mmc/host/sdhci.c ?| ? 27 +++++++++++++++------------
> ?include/linux/mmc/sdhci.h | ? ?1 +
> ?2 files changed, 16 insertions(+), 12 deletions(-)
>

Hi, Daniel

We found some impact to sd if reusing vmmc in set_ios, when no sd card
is inserted.
When no sd card, CD pin is high, but when vmmc is disabled in
mmc_power_down, as a result CD pin will be pulled down, which is same
as sd card is inserted, however the card detect will fail since no sd
card in fact.

So additional regulator vsdio still required to control power of
vsdio, to make mmc_power_up/down control sdio power.

Thanks

[PATCH 2/2] ARM: mmp2: support sdio device 8787

[Zhangfei Gao]

Support 8787 device, provide regulator vmmc

With CONFIG_PM_RUNTIME=y
8787 power is enabled if any client module over sdio is insmod, and disbled automatically after all client modules over sdio are rmmod
Also 8787 power could be controled by mmc_start/stop_host via debugfs

Signed-off-by: Zhangfei Gao <zhangfei.gao@marvell.com>
---
 arch/arm/mach-mmp/brownstone.c |   60 ++++++++++++++++++++++++++++++++++++++-
 1 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-mmp/brownstone.c b/arch/arm/mach-mmp/brownstone.c
index c79162a..46a67b9 100644
--- a/arch/arm/mach-mmp/brownstone.c
+++ b/arch/arm/mach-mmp/brownstone.c
@@ -89,6 +89,9 @@ static unsigned long brownstone_pin_config[] __initdata = {
 	GPIO41_MMC2_CMD | MFP_PULL_HIGH,
 	GPIO42_MMC2_CLK,
 
+	GPIO57_GPIO | MFP_LPM_DRIVE_HIGH | MFP_PULL_HIGH,
+	GPIO58_GPIO | MFP_LPM_DRIVE_HIGH | MFP_PULL_HIGH,
+
 	/* MMC2 */
 	GPIO165_MMC3_DAT7 | MFP_PULL_HIGH,
 	GPIO162_MMC3_DAT6 | MFP_PULL_HIGH,
@@ -180,12 +183,66 @@ static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc0 = {
 	.clk_delay_cycles = 0x1f,
 };
 
+static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc1 = {
+	.flags = PXA_FLAG_CARD_PERMANENT,
+};
+
 static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc2 = {
 	.clk_delay_cycles = 0x1f,
 	.flags = PXA_FLAG_CARD_PERMANENT
 		| PXA_FLAG_SD_8_BIT_CAPABLE_SLOT,
 };
 
+static struct regulator_consumer_supply sdio_power_supplies[] = {
+	REGULATOR_SUPPLY("vmmc", "sdhci-pxav3.1"),
+};
+
+static struct regulator_init_data sdio_power_data = {
+	.constraints	= {
+		.valid_ops_mask		= REGULATOR_CHANGE_STATUS,
+	},
+	.num_consumer_supplies	= ARRAY_SIZE(sdio_power_supplies),
+	.consumer_supplies	= sdio_power_supplies,
+};
+
+static struct fixed_voltage_config sdio_power = {
+	.supply_name		= "vmmc",
+	.microvolts		= 3000000,
+	.gpio			= mfp_to_gpio(MFP_PIN_GPIO57),
+	.enable_high		= 1,
+	.enabled_at_boot	= 0,
+	.init_data		= &sdio_power_data,
+};
+
+static struct platform_device sdio_power_device = {
+	.name		= "reg-fixed-voltage",
+	.id		= 2,
+	.dev = {
+		.platform_data = &sdio_power,
+	},
+};
+
+static void __init brownstone_init_mmc(void)
+{
+	/*
+	 * PDn: GPIO57; RESETn: GPIO58
+	 * 8787, RESETn keeps high, PDn control power
+	 * on: PDn 1; off: PDn 0;
+	 */
+	int RESETn = mfp_to_gpio(MFP_PIN_GPIO58);
+
+	if (gpio_request(RESETn, "sdio RESETn")) {
+		pr_err("Failed to request sdio RESETn gpio\n");
+		return;
+	}
+	gpio_direction_output(RESETn, 1);
+	gpio_free(RESETn);
+
+	platform_device_register(&sdio_power_device);
+	mmp2_add_sdhost(0, &mmp2_sdh_platdata_mmc0); /* SD/MMC */
+	mmp2_add_sdhost(1, &mmp2_sdh_platdata_mmc1); /* sdio */
+	mmp2_add_sdhost(2, &mmp2_sdh_platdata_mmc2); /* eMMC */
+}
 
 static void __init brownstone_init(void)
 {
@@ -195,8 +252,7 @@ static void __init brownstone_init(void)
 	mmp2_add_uart(1);
 	mmp2_add_uart(3);
 	mmp2_add_twsi(1, NULL, ARRAY_AND_SIZE(brownstone_twsi1_info));
-	mmp2_add_sdhost(0, &mmp2_sdh_platdata_mmc0); /* SD/MMC */
-	mmp2_add_sdhost(2, &mmp2_sdh_platdata_mmc2); /* eMMC */
+	brownstone_init_mmc();
 
 	/* enable 5v regulator */
 	platform_device_register(&brownstone_v_5vp_device);
-- 
1.7.0.4