[PATCH 0/4] mmc: simplify WP/CD GPIO handling

[PATCH 0/4] mmc: simplify WP/CD GPIO handling

[Michał Mirosław]

This series removes convoluted handling of inverted CD and WP lines in
SD/MMC host drivers when using GPIOs.

First patch, sent separately earlier, adds gpiod_toggle_active_low() to
switch line inversion flag in the gpiod structure. Next two patches
modify WP and CD initialization to apply all the inversions onto gpiod's
active-low flag. Final patch removes now-unused argument from init functions.

x86 allyesconfig build-tested.

Michał Mirosław (4):
  gpio: add gpiod_toggle_active_low()
  mmc: rework wp-gpio handling
  mmc: rework cd-gpio handling
  mmc: remove mmc_gpiod_request_*(invert_gpio)

 drivers/gpio/gpiolib-of.c          | 21 -------------------
 drivers/gpio/gpiolib.c             | 11 ++++++++++
 drivers/mmc/core/host.c            | 33 ++++++++----------------------
 drivers/mmc/core/slot-gpio.c       | 30 ++++++++++-----------------
 drivers/mmc/host/davinci_mmc.c     |  4 ++--
 drivers/mmc/host/mmc_spi.c         |  4 ++--
 drivers/mmc/host/mmci.c            |  4 ++--
 drivers/mmc/host/pxamci.c          | 12 +++++------
 drivers/mmc/host/s3cmci.c          |  4 ++--
 drivers/mmc/host/sdhci-acpi.c      |  2 +-
 drivers/mmc/host/sdhci-esdhc-imx.c | 15 +++++++-------
 drivers/mmc/host/sdhci-pci-core.c  |  4 ++--
 drivers/mmc/host/sdhci-sirf.c      |  2 +-
 drivers/mmc/host/sdhci-spear.c     |  2 +-
 drivers/mmc/host/tmio_mmc_core.c   |  2 +-
 include/linux/gpio/consumer.h      |  7 +++++++
 include/linux/mmc/slot-gpio.h      |  5 ++---
 17 files changed, 67 insertions(+), 95 deletions(-)

-- 
2.20.1

[PATCH 1/4] gpio: add gpiod_toggle_active_low()

[Michał Mirosław]

Add possibility to toggle active-low flag of a gpio descriptor. This is
useful for compatibility code, where defaults are inverted vs DT gpio
flags or the active-low flag is taken from elsewhere.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/gpio/gpiolib.c        | 11 +++++++++++
 include/linux/gpio/consumer.h |  7 +++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9913886ede90..6130691e2047 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3363,6 +3363,17 @@ int gpiod_is_active_low(const struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(gpiod_is_active_low);
 
+/**
+ * gpiod_toggle_active_low - toggle whether a GPIO is active-low or not
+ * @desc: the gpio descriptor to change
+ */
+void gpiod_toggle_active_low(struct gpio_desc *desc)
+{
+	VALIDATE_DESC_VOID(desc);
+	change_bit(FLAG_ACTIVE_LOW, &desc->flags);
+}
+EXPORT_SYMBOL_GPL(gpiod_toggle_active_low);
+
 /* I/O calls are only valid after configuration completed; the relevant
  * "is this a valid GPIO" error checks should already have been done.
  *
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 5215fdba6b9a..bf2d017dd7b7 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -158,6 +158,7 @@ int gpiod_set_raw_array_value_cansleep(unsigned int array_size,
 
 int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
 int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
+void gpiod_toggle_active_low(struct gpio_desc *desc);
 
 int gpiod_is_active_low(const struct gpio_desc *desc);
 int gpiod_cansleep(const struct gpio_desc *desc);
@@ -483,6 +484,12 @@ static inline int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
 	return -ENOSYS;
 }
 
+static inline void gpiod_toggle_active_low(struct gpio_desc *desc)
+{
+	/* GPIO can never have been requested */
+	WARN_ON(desc);
+}
+
 static inline int gpiod_is_active_low(const struct gpio_desc *desc)
 {
 	/* GPIO can never have been requested */
-- 
2.20.1

[PATCH 2/4] mmc: rework wp-gpio handling

[Michał Mirosław]

Use MMC_CAP2_RO_ACTIVE_HIGH flag as indicator if GPIO line is to be
inverted compared to DT/platform-specified polarity. The flag is not
used after init in GPIO mode anyway. No functional changes intended.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/gpio/gpiolib-of.c          |  4 ----
 drivers/mmc/core/host.c            | 11 ++++-------
 drivers/mmc/core/slot-gpio.c       |  3 +++
 drivers/mmc/host/pxamci.c          |  8 ++++----
 drivers/mmc/host/sdhci-esdhc-imx.c | 13 +++++++------
 5 files changed, 18 insertions(+), 21 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index dc27b1a88e93..b0b77e52e261 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -120,10 +120,6 @@ static void of_gpio_flags_quirks(struct device_node *np,
 			if (of_property_read_bool(np, "cd-inverted"))
 				*flags ^= OF_GPIO_ACTIVE_LOW;
 		}
-		if (!strcmp(propname, "wp-gpios")) {
-			if (of_property_read_bool(np, "wp-inverted"))
-				*flags ^= OF_GPIO_ACTIVE_LOW;
-		}
 	}
 	/*
 	 * Some GPIO fixed regulator quirks.
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 105b7a7c0251..b3484def0a8b 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -176,7 +176,6 @@ int mmc_of_parse(struct mmc_host *host)
 	u32 bus_width, drv_type, cd_debounce_delay_ms;
 	int ret;
 	bool cd_cap_invert, cd_gpio_invert = false;
-	bool ro_cap_invert, ro_gpio_invert = false;
 
 	if (!dev || !dev_fwnode(dev))
 		return 0;
@@ -255,9 +254,11 @@ int mmc_of_parse(struct mmc_host *host)
 	}
 
 	/* Parse Write Protection */
-	ro_cap_invert = device_property_read_bool(dev, "wp-inverted");
 
-	ret = mmc_gpiod_request_ro(host, "wp", 0, 0, &ro_gpio_invert);
+	if (device_property_read_bool(dev, "wp-inverted"))
+		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
+	ret = mmc_gpiod_request_ro(host, "wp", 0, 0, NULL);
 	if (!ret)
 		dev_info(host->parent, "Got WP GPIO\n");
 	else if (ret != -ENOENT && ret != -ENOSYS)
@@ -266,10 +267,6 @@ int mmc_of_parse(struct mmc_host *host)
 	if (device_property_read_bool(dev, "disable-wp"))
 		host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
 
-	/* See the comment on CD inversion above */
-	if (ro_cap_invert ^ ro_gpio_invert)
-		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
-
 	if (device_property_read_bool(dev, "cap-sd-highspeed"))
 		host->caps |= MMC_CAP_SD_HIGHSPEED;
 	if (device_property_read_bool(dev, "cap-mmc-highspeed"))
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index da2596c5fa28..582ec3d720f6 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -241,6 +241,9 @@ int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
 			return ret;
 	}
 
+	if (host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH)
+		gpiod_toggle_active_low(desc);
+
 	if (gpio_invert)
 		*gpio_invert = !gpiod_is_active_low(desc);
 
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 024acc1b0a2e..b2bbcb09a49e 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -740,16 +740,16 @@ static int pxamci_probe(struct platform_device *pdev)
 			goto out;
 		}
 
+		if (!host->pdata->gpio_card_ro_invert)
+			mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
 		ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
 		if (ret && ret != -ENOENT) {
 			dev_err(dev, "Failed requesting gpio_ro\n");
 			goto out;
 		}
-		if (!ret) {
+		if (!ret)
 			host->use_ro_gpio = true;
-			mmc->caps2 |= host->pdata->gpio_card_ro_invert ?
-				0 : MMC_CAP2_RO_ACTIVE_HIGH;
-		}
 
 		if (host->pdata->init)
 			host->pdata->init(dev, pxamci_detect_irq, mmc);
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 1c988d6a2433..f1b21d87ecea 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1381,13 +1381,14 @@ static int sdhci_esdhc_imx_probe_nondt(struct platform_device *pdev,
 				host->mmc->parent->platform_data);
 	/* write_protect */
 	if (boarddata->wp_type == ESDHC_WP_GPIO) {
-		err = mmc_gpiod_request_ro(host->mmc, "wp", 0, 0, NULL);
-		if (err) {
-			dev_err(mmc_dev(host->mmc),
-				"failed to request write-protect gpio!\n");
-			return err;
-		}
 		host->mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
+		err = mmc_gpiod_request_ro(host->mmc, "wp", 0, 0);
+		if (err) {
+			dev_err(mmc_dev(host->mmc),
+				"failed to request write-protect gpio!\n");
+			return err;
+		}
 	}
 
 	/* card_detect */
-- 
2.20.1

[PATCH 3/4] mmc: rework cd-gpio handling

[Michał Mirosław]

There are a few places around the code that invert inverted and possibly
inverted CD line. That's really confusing. Squash them all into one
place in mmc_gpiod_request_cd(). MMC_CAP2_CD_ACTIVE_HIGH is used
analogously to WP line: in GPIO mode it is used only at probe time to
switch polarity, for native mode it is left as is.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/gpio/gpiolib-of.c    | 17 -----------------
 drivers/mmc/core/host.c      | 21 ++++-----------------
 drivers/mmc/core/slot-gpio.c | 17 ++++++++---------
 3 files changed, 12 insertions(+), 43 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index b0b77e52e261..8310da48ba01 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -104,23 +104,6 @@ static void of_gpio_flags_quirks(struct device_node *np,
 				 enum of_gpio_flags *flags,
 				 int index)
 {
-	/*
-	 * Handle MMC "cd-inverted" and "wp-inverted" semantics.
-	 */
-	if (IS_ENABLED(CONFIG_MMC)) {
-		/*
-		 * Active low is the default according to the
-		 * SDHCI specification and the device tree
-		 * bindings. However the code in the current
-		 * kernel was written such that the phandle
-		 * flags were always respected, and "cd-inverted"
-		 * would invert the flag from the device phandle.
-		 */
-		if (!strcmp(propname, "cd-gpios")) {
-			if (of_property_read_bool(np, "cd-inverted"))
-				*flags ^= OF_GPIO_ACTIVE_LOW;
-		}
-	}
 	/*
 	 * Some GPIO fixed regulator quirks.
 	 * Note that active low is the default.
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index b3484def0a8b..e655dc1b5b85 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -175,7 +175,6 @@ int mmc_of_parse(struct mmc_host *host)
 	struct device *dev = host->parent;
 	u32 bus_width, drv_type, cd_debounce_delay_ms;
 	int ret;
-	bool cd_cap_invert, cd_gpio_invert = false;
 
 	if (!dev || !dev_fwnode(dev))
 		return 0;
@@ -218,10 +217,12 @@ int mmc_of_parse(struct mmc_host *host)
 	 */
 
 	/* Parse Card Detection */
+
 	if (device_property_read_bool(dev, "non-removable")) {
 		host->caps |= MMC_CAP_NONREMOVABLE;
 	} else {
-		cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
+		if (device_property_read_bool(dev, "cd-inverted"))
+			host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
 
 		if (device_property_read_u32(dev, "cd-debounce-delay-ms",
 					     &cd_debounce_delay_ms))
@@ -232,25 +233,11 @@ int mmc_of_parse(struct mmc_host *host)
 
 		ret = mmc_gpiod_request_cd(host, "cd", 0, false,
 					   cd_debounce_delay_ms * 1000,
-					   &cd_gpio_invert);
+					   NULL);
 		if (!ret)
 			dev_info(host->parent, "Got CD GPIO\n");
 		else if (ret != -ENOENT && ret != -ENOSYS)
 			return ret;
-
-		/*
-		 * There are two ways to flag that the CD line is inverted:
-		 * through the cd-inverted flag and by the GPIO line itself
-		 * being inverted from the GPIO subsystem. This is a leftover
-		 * from the times when the GPIO subsystem did not make it
-		 * possible to flag a line as inverted.
-		 *
-		 * If the capability on the host AND the GPIO line are
-		 * both inverted, the end result is that the CD line is
-		 * not inverted.
-		 */
-		if (cd_cap_invert ^ cd_gpio_invert)
-			host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
 	}
 
 	/* Parse Write Protection */
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 582ec3d720f6..303e825ecfd8 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -19,7 +19,6 @@
 struct mmc_gpio {
 	struct gpio_desc *ro_gpio;
 	struct gpio_desc *cd_gpio;
-	bool override_cd_active_level;
 	irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
 	char *ro_label;
 	char *cd_label;
@@ -80,13 +79,6 @@ int mmc_gpio_get_cd(struct mmc_host *host)
 		return -ENOSYS;
 
 	cansleep = gpiod_cansleep(ctx->cd_gpio);
-	if (ctx->override_cd_active_level) {
-		int value = cansleep ?
-				gpiod_get_raw_value_cansleep(ctx->cd_gpio) :
-				gpiod_get_raw_value(ctx->cd_gpio);
-		return !value ^ !!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
-	}
-
 	return cansleep ?
 		gpiod_get_value_cansleep(ctx->cd_gpio) :
 		gpiod_get_value(ctx->cd_gpio);
@@ -194,10 +186,17 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
 			ctx->cd_debounce_delay_ms = debounce / 1000;
 	}
 
+	/* override forces default (active-low) polarity ... */
+	if (override_active_level && !gpiod_is_active_low(desc))
+		gpiod_toggle_active_low(desc);
+
+	/* ... or active-high */
+	if (host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)
+		gpiod_toggle_active_low(desc);
+
 	if (gpio_invert)
 		*gpio_invert = !gpiod_is_active_low(desc);
 
-	ctx->override_cd_active_level = override_active_level;
 	ctx->cd_gpio = desc;
 
 	return 0;
-- 
2.20.1

[PATCH 4/4] mmc: remove mmc_gpiod_request_*(invert_gpio)

[Michał Mirosław]

Now, that invert_gpio arguments are unused, remove them.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/mmc/core/host.c            |  5 ++---
 drivers/mmc/core/slot-gpio.c       | 14 ++------------
 drivers/mmc/host/davinci_mmc.c     |  4 ++--
 drivers/mmc/host/mmc_spi.c         |  4 ++--
 drivers/mmc/host/mmci.c            |  4 ++--
 drivers/mmc/host/pxamci.c          |  4 ++--
 drivers/mmc/host/s3cmci.c          |  4 ++--
 drivers/mmc/host/sdhci-acpi.c      |  2 +-
 drivers/mmc/host/sdhci-esdhc-imx.c |  2 +-
 drivers/mmc/host/sdhci-pci-core.c  |  4 ++--
 drivers/mmc/host/sdhci-sirf.c      |  2 +-
 drivers/mmc/host/sdhci-spear.c     |  2 +-
 drivers/mmc/host/tmio_mmc_core.c   |  2 +-
 include/linux/mmc/slot-gpio.h      |  5 ++---
 14 files changed, 23 insertions(+), 35 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index e655dc1b5b85..c8768726d925 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -232,8 +232,7 @@ int mmc_of_parse(struct mmc_host *host)
 			host->caps |= MMC_CAP_NEEDS_POLL;
 
 		ret = mmc_gpiod_request_cd(host, "cd", 0, false,
-					   cd_debounce_delay_ms * 1000,
-					   NULL);
+					   cd_debounce_delay_ms * 1000);
 		if (!ret)
 			dev_info(host->parent, "Got CD GPIO\n");
 		else if (ret != -ENOENT && ret != -ENOSYS)
@@ -245,7 +244,7 @@ int mmc_of_parse(struct mmc_host *host)
 	if (device_property_read_bool(dev, "wp-inverted"))
 		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
 
-	ret = mmc_gpiod_request_ro(host, "wp", 0, 0, NULL);
+	ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
 	if (!ret)
 		dev_info(host->parent, "Got WP GPIO\n");
 	else if (ret != -ENOENT && ret != -ENOSYS)
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 303e825ecfd8..d66225c1feaf 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -160,8 +160,6 @@ EXPORT_SYMBOL(mmc_gpio_set_cd_isr);
  * @idx: index of the GPIO to obtain in the consumer
  * @override_active_level: ignore %GPIO_ACTIVE_LOW flag
  * @debounce: debounce time in microseconds
- * @gpio_invert: will return whether the GPIO line is inverted or not, set
- * to NULL to ignore
  *
  * Note that this must be called prior to mmc_add_host()
  * otherwise the caller must also call mmc_gpiod_request_cd_irq().
@@ -170,7 +168,7 @@ EXPORT_SYMBOL(mmc_gpio_set_cd_isr);
  */
 int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
 			 unsigned int idx, bool override_active_level,
-			 unsigned int debounce, bool *gpio_invert)
+			 unsigned int debounce)
 {
 	struct mmc_gpio *ctx = host->slot.handler_priv;
 	struct gpio_desc *desc;
@@ -194,9 +192,6 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
 	if (host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)
 		gpiod_toggle_active_low(desc);
 
-	if (gpio_invert)
-		*gpio_invert = !gpiod_is_active_low(desc);
-
 	ctx->cd_gpio = desc;
 
 	return 0;
@@ -217,14 +212,12 @@ EXPORT_SYMBOL(mmc_can_gpio_cd);
  * @con_id: function within the GPIO consumer
  * @idx: index of the GPIO to obtain in the consumer
  * @debounce: debounce time in microseconds
- * @gpio_invert: will return whether the GPIO line is inverted or not,
- * set to NULL to ignore
  *
  * Returns zero on success, else an error.
  */
 int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
 			 unsigned int idx,
-			 unsigned int debounce, bool *gpio_invert)
+			 unsigned int debounce)
 {
 	struct mmc_gpio *ctx = host->slot.handler_priv;
 	struct gpio_desc *desc;
@@ -243,9 +236,6 @@ int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
 	if (host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH)
 		gpiod_toggle_active_low(desc);
 
-	if (gpio_invert)
-		*gpio_invert = !gpiod_is_active_low(desc);
-
 	ctx->ro_gpio = desc;
 
 	return 0;
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index ebfaeb33bc8c..f01fecd75833 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -1174,13 +1174,13 @@ static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
 		mmc->caps |= pdata->caps;
 
 	/* Register a cd gpio, if there is not one, enable polling */
-	ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+	ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
 	if (ret == -EPROBE_DEFER)
 		return ret;
 	else if (ret)
 		mmc->caps |= MMC_CAP_NEEDS_POLL;
 
-	ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
+	ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
 	if (ret == -EPROBE_DEFER)
 		return ret;
 
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 74c6cfbf9172..76a67a292b16 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1421,7 +1421,7 @@ static int mmc_spi_probe(struct spi_device *spi)
 	 * Index 0 is card detect
 	 * Old boardfiles were specifying 1 ms as debounce
 	 */
-	status = mmc_gpiod_request_cd(mmc, NULL, 0, false, 1000, NULL);
+	status = mmc_gpiod_request_cd(mmc, NULL, 0, false, 1000);
 	if (status == -EPROBE_DEFER)
 		goto fail_add_host;
 	if (!status) {
@@ -1436,7 +1436,7 @@ static int mmc_spi_probe(struct spi_device *spi)
 	mmc_detect_change(mmc, 0);
 
 	/* Index 1 is write protect/read only */
-	status = mmc_gpiod_request_ro(mmc, NULL, 1, 0, NULL);
+	status = mmc_gpiod_request_ro(mmc, NULL, 1, 0);
 	if (status == -EPROBE_DEFER)
 		goto fail_add_host;
 	if (!status)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 40e72c30ea84..7c5c24f9f8fe 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -2062,11 +2062,11 @@ static int mmci_probe(struct amba_device *dev,
 	 * silently of these do not exist
 	 */
 	if (!np) {
-		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
 		if (ret == -EPROBE_DEFER)
 			goto clk_disable;
 
-		ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
+		ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
 		if (ret == -EPROBE_DEFER)
 			goto clk_disable;
 	}
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index b2bbcb09a49e..d38982abd26d 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -734,7 +734,7 @@ static int pxamci_probe(struct platform_device *pdev)
 		}
 
 		/* FIXME: should we pass detection delay to debounce? */
-		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
 		if (ret && ret != -ENOENT) {
 			dev_err(dev, "Failed requesting gpio_cd\n");
 			goto out;
@@ -743,7 +743,7 @@ static int pxamci_probe(struct platform_device *pdev)
 		if (!host->pdata->gpio_card_ro_invert)
 			mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
 
-		ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0, NULL);
+		ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
 		if (ret && ret != -ENOENT) {
 			dev_err(dev, "Failed requesting gpio_ro\n");
 			goto out;
diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index bce9c33bc4b5..1e616ae56b13 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -1505,14 +1505,14 @@ static int s3cmci_probe_pdata(struct s3cmci_host *host)
 		mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
 
 	/* If we get -ENOENT we have no card detect GPIO line */
-	ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+	ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
 	if (ret != -ENOENT) {
 		dev_err(&pdev->dev, "error requesting GPIO for CD %d\n",
 			ret);
 		return ret;
 	}
 
-	ret = mmc_gpiod_request_ro(host->mmc, "wp", 0, 0, NULL);
+	ret = mmc_gpiod_request_ro(host->mmc, "wp", 0, 0);
 	if (ret != -ENOENT) {
 		dev_err(&pdev->dev, "error requesting GPIO for WP %d\n",
 			ret);
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 105e73d4a3b9..dd908577a9dc 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -752,7 +752,7 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
 	if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 		bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
 
-		err = mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL);
+		err = mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0);
 		if (err) {
 			if (err == -EPROBE_DEFER)
 				goto err_free;
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index f1b21d87ecea..e9d408870f4f 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1394,7 +1394,7 @@ static int sdhci_esdhc_imx_probe_nondt(struct platform_device *pdev,
 	/* card_detect */
 	switch (boarddata->cd_type) {
 	case ESDHC_CD_GPIO:
-		err = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0, NULL);
+		err = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
 		if (err) {
 			dev_err(mmc_dev(host->mmc),
 				"failed to request card-detect gpio!\n");
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index acefb76b4e15..53496111883d 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -1983,12 +1983,12 @@ static struct sdhci_pci_slot *sdhci_pci_probe_slot(
 
 	if (slot->cd_idx >= 0) {
 		ret = mmc_gpiod_request_cd(host->mmc, "cd", slot->cd_idx,
-					   slot->cd_override_level, 0, NULL);
+					   slot->cd_override_level, 0);
 		if (ret && ret != -EPROBE_DEFER)
 			ret = mmc_gpiod_request_cd(host->mmc, NULL,
 						   slot->cd_idx,
 						   slot->cd_override_level,
-						   0, NULL);
+						   0);
 		if (ret == -EPROBE_DEFER)
 			goto remove;
 
diff --git a/drivers/mmc/host/sdhci-sirf.c b/drivers/mmc/host/sdhci-sirf.c
index e43143223320..f4b05dd6c20a 100644
--- a/drivers/mmc/host/sdhci-sirf.c
+++ b/drivers/mmc/host/sdhci-sirf.c
@@ -194,7 +194,7 @@ static int sdhci_sirf_probe(struct platform_device *pdev)
 	 * We must request the IRQ after sdhci_add_host(), as the tasklet only
 	 * gets setup in sdhci_add_host() and we oops.
 	 */
-	ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0, NULL);
+	ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
 	if (ret == -EPROBE_DEFER)
 		goto err_request_cd;
 	if (!ret)
diff --git a/drivers/mmc/host/sdhci-spear.c b/drivers/mmc/host/sdhci-spear.c
index 916b5b09c3d1..141dd3847411 100644
--- a/drivers/mmc/host/sdhci-spear.c
+++ b/drivers/mmc/host/sdhci-spear.c
@@ -98,7 +98,7 @@ static int sdhci_probe(struct platform_device *pdev)
 	 * It is optional to use GPIOs for sdhci card detection. If we
 	 * find a descriptor using slot GPIO, we use it.
 	 */
-	ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0, NULL);
+	ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
 	if (ret == -EPROBE_DEFER)
 		goto disable_clk;
 
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index c4a1d49fbea4..d68bc4e3891d 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -1181,7 +1181,7 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
 	 * Look for a card detect GPIO, if it fails with anything
 	 * else than a probe deferral, just live without it.
 	 */
-	ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+	ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
 	if (ret == -EPROBE_DEFER)
 		return ret;
 
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index 0de3d7c016cd..4ae2f2908f99 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -17,10 +17,9 @@ int mmc_gpio_get_ro(struct mmc_host *host);
 int mmc_gpio_get_cd(struct mmc_host *host);
 int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
 			 unsigned int idx, bool override_active_level,
-			 unsigned int debounce, bool *gpio_invert);
+			 unsigned int debounce);
 int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
-			 unsigned int idx,
-			 unsigned int debounce, bool *gpio_invert);
+			 unsigned int idx, unsigned int debounce);
 void mmc_gpio_set_cd_isr(struct mmc_host *host,
 			 irqreturn_t (*isr)(int irq, void *dev_id));
 int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on);
-- 
2.20.1

Re: [PATCH 0/4] mmc: simplify WP/CD GPIO handling

[Linus Walleij]

On Mon, Dec 9, 2019 at 10:09 PM Michał Mirosław <mirq-linux@rere.qmqm.pl> wrote:

> This series removes convoluted handling of inverted CD and WP lines in
> SD/MMC host drivers when using GPIOs.
>
> First patch, sent separately earlier, adds gpiod_toggle_active_low() to
> switch line inversion flag in the gpiod structure. Next two patches
> modify WP and CD initialization to apply all the inversions onto gpiod's
> active-low flag. Final patch removes now-unused argument from init functions.

I like the approach, as much as I liked my own idea to centralize
all DT quirks and hide them in gpiolib-of.c I can see how this
makes it easier to solve the final hurdles in the MMC framework
and contain it better.

If it also works I'm happy for Ulf to merge all of this!

Yours,
Linus Walleij

Re: [PATCH 1/4] gpio: add gpiod_toggle_active_low()

[Linus Walleij]

On Mon, Dec 9, 2019 at 10:09 PM Michał Mirosław <mirq-linux@rere.qmqm.pl> wrote:

> Add possibility to toggle active-low flag of a gpio descriptor. This is
> useful for compatibility code, where defaults are inverted vs DT gpio
> flags or the active-low flag is taken from elsewhere.
>
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Proliferating APIs isn't good but I think this is the lesser evil
given the mess there is in the MMC subsystem for this stuff.

Maybe I can make a second attempt to move all polarity
toggling back to gpiolib-of.c and remove the API after this
has landed, hehe ;)

Yours,
Linus Walleij