Allow to use tunable delay before detecting card after card is inserted
either from firmware, or argument passing to mmc_gpiod_request_cd(). The
default value is 200ms as before, if cd-delay-ms isn't present but using
mmc_gpiod_request_cd() to request slot-gpio interrupt.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
drivers/mmc/core/host.c | 7 +++++--
drivers/mmc/core/slot-gpio.c | 11 +++++++++--
drivers/mmc/host/davinci_mmc.c | 2 +-
drivers/mmc/host/mmci.c | 2 +-
drivers/mmc/host/sdhci-acpi.c | 2 +-
drivers/mmc/host/sdhci-pci-core.c | 3 ++-
include/linux/mmc/slot-gpio.h | 3 ++-
7 files changed, 21 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 64b03d6..cb8babc 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -179,7 +179,7 @@ static void mmc_retune_timer(struct timer_list *t)
int mmc_of_parse(struct mmc_host *host)
{
struct device *dev = host->parent;
- u32 bus_width, drv_type;
+ u32 bus_width, drv_type, cd_delay_ms;
int ret;
bool cd_cap_invert, cd_gpio_invert = false;
bool ro_cap_invert, ro_gpio_invert = false;
@@ -230,11 +230,14 @@ int mmc_of_parse(struct mmc_host *host)
} else {
cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
+ if (device_property_read_u32(dev, "cd-delay-ms", &cd_delay_ms))
+ cd_delay_ms = 200;
+
if (device_property_read_bool(dev, "broken-cd"))
host->caps |= MMC_CAP_NEEDS_POLL;
ret = mmc_gpiod_request_cd(host, "cd", 0, true,
- 0, &cd_gpio_invert);
+ 0, &cd_gpio_invert, cd_delay_ms);
if (!ret)
dev_info(host->parent, "Got CD 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 31f7dbb..baa6e8d 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -28,15 +28,17 @@ struct mmc_gpio {
irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
char *ro_label;
char cd_label[0];
+ u32 cd_delay_ms;
};
static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
{
/* Schedule a card detection after a debounce timeout */
struct mmc_host *host = dev_id;
+ struct mmc_gpio *ctx = host->slot.handler_priv;
host->trigger_card_event = true;
- mmc_detect_change(host, msecs_to_jiffies(200));
+ mmc_detect_change(host, msecs_to_jiffies(ctx->cd_delay_ms));
return IRQ_HANDLED;
}
@@ -49,6 +51,7 @@ int mmc_gpio_alloc(struct mmc_host *host)
if (ctx) {
ctx->ro_label = ctx->cd_label + len;
+ ctx->cd_delay_ms = 200;
snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
host->slot.handler_priv = ctx;
@@ -239,6 +242,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
* @debounce: debounce time in microseconds
* @gpio_invert: will return whether the GPIO line is inverted or not, set
* to NULL to ignore
+ * @cd_delay_ms: delay time in ms before detecting card after card insert
+ * event
*
* Use this function in place of mmc_gpio_request_cd() to use the GPIO
* descriptor API. Note that it must be called prior to mmc_add_host()
@@ -248,7 +253,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
*/
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, bool *gpio_invert,
+ u32 cd_delay_ms)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
struct gpio_desc *desc;
@@ -269,6 +275,7 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
ctx->override_cd_active_level = override_active_level;
ctx->cd_gpio = desc;
+ ctx->cd_delay_ms = cd_delay_ms;
return 0;
}
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 8e36317..fcff397 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -1187,7 +1187,7 @@ 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, NULL, 200);
if (ret == -EPROBE_DEFER)
return ret;
else if (ret)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 70b0df8..0771c4f 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1827,7 +1827,7 @@ static int mmci_probe(struct amba_device *dev,
* silently of these do not exist and proceed to try platform data
*/
if (!np) {
- ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+ ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL, 200);
if (ret < 0) {
if (ret == -EPROBE_DEFER)
goto clk_disable;
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 32321bd..4157a29 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -718,7 +718,7 @@ 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, NULL, 200);
if (err) {
if (err == -EPROBE_DEFER)
goto err_free;
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 787434e..7842a67 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -1715,7 +1715,8 @@ static struct sdhci_pci_slot *sdhci_pci_probe_slot(
if (slot->cd_idx >= 0) {
ret = mmc_gpiod_request_cd(host->mmc, NULL, slot->cd_idx,
- slot->cd_override_level, 0, NULL);
+ slot->cd_override_level, 0, NULL,
+ 200);
if (ret == -EPROBE_DEFER)
goto remove;
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index 06607c5..b13f3a9 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -25,7 +25,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
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, bool *gpio_invert,
+ u32 cd_delay);
int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
unsigned int idx, bool override_active_level,
unsigned int debounce, bool *gpio_invert);
--
1.9.1
--
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