On 20 April 2018 at 08:59, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxxx>
>
> ---
>
> Changes in v3: None
> Changes in v2:
> - doesn't introduce new agrument for mmc_gpiod_request_cd and drop
> the change for host drivers
>
> drivers/mmc/core/host.c | 7 +++++--
> drivers/mmc/core/slot-gpio.c | 9 +++++++--
> 2 files changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index 64b03d6..d281cbf 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);
> + cd_delay_ms, &cd_gpio_invert);
> 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..2ef41be 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
This looks like a leftover from earlier versions...
> *
> * 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()
> @@ -261,7 +266,7 @@ 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_delay_ms = debounce;
> }
>
> if (gpio_invert)
> --
> 1.9.1
>
>
Besides the minor thing above, this looks good to me.
Kind regards
Uffe
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