diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2018-04-24 08:42:57 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-03 10:33:52 +0200 |
| commit | bfd694d5e21c2f0d344db6afeaf993bb0f299545 (patch) | |
| tree | 73f78f4ea0238bf3941c596f5e571b161c726346 /drivers/mmc/core/slot-gpio.c | |
| parent | 52a70098ffb9a1cb1ec377f5e63b137db5d1ccbd (diff) | |
mmc: core: Add tunable delay before detecting card after card is inserted
Allow to use tunable delay before detecting card after card is inserted,
which either comes from firmware node, or comes from debounce value
passed on to mmc_gpiod_request_cd(). If the platform doesn't support
debounce, then we fall back to use the debounce period as the delay,
otherwise, it behaves the same as before that a HW debounce(if set) plus
a 200ms hardcode delay before detecting the card.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/core/slot-gpio.c')
| -rw-r--r-- | drivers/mmc/core/slot-gpio.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c index 31f7dbb15668..56559351d2e1 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_debounce_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_debounce_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_debounce_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; @@ -261,7 +264,7 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id, if (debounce) { ret = gpiod_set_debounce(desc, debounce); if (ret < 0) - return ret; + ctx->cd_debounce_delay_ms = debounce; } if (gpio_invert) |