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BACKPORT: FROMLIST: mmc: core: Add tunable delay before detecting card after card is inserted

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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.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Change-Id: Ib3ed4cbcdeb0986b584d7dc9057461888e554967
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
(cherry picked from commit 26288b77fd04ea54a84801b1c92c8da519986040
of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git)
This commit is contained in:
Shawn Lin 2018-05-03 16:47:57 +08:00 committed by Tao Huang
parent d6e7df40b5
commit cda34cc0e4
2 changed files with 13 additions and 4 deletions
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10
drivers/mmc/core/host.c
View File

@ -154,8 +154,9 @@ static void mmc_retune_timer(unsigned long data)
*/
int mmc_of_parse(struct mmc_host *host)
{
struct device *dev = host->parent;
struct device_node *np;
u32 bus_width;
u32 bus_width, cd_debounce_delay_ms;
int ret;
bool cd_cap_invert, cd_gpio_invert = false;
bool ro_cap_invert, ro_gpio_invert = false;
@ -208,11 +209,16 @@ int mmc_of_parse(struct mmc_host *host)
} else {
cd_cap_invert = of_property_read_bool(np, "cd-inverted");
if (device_property_read_u32(dev, "cd-debounce-delay-ms",
&cd_debounce_delay_ms))
cd_debounce_delay_ms = 200;
if (of_property_read_bool(np, "broken-cd"))
host->caps |= MMC_CAP_NEEDS_POLL;
ret = mmc_gpiod_request_cd(host, "cd", 0, true,
0, &cd_gpio_invert);
cd_debounce_delay_ms,
&cd_gpio_invert);
if (!ret)
dev_info(host->parent, "Got CD GPIO\n");
else if (ret != -ENOENT && ret != -ENOSYS)

7
drivers/mmc/core/slot-gpio.c
View File

@ -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;
@ -201,7 +204,7 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
if (debounce) {
ret = gpio_set_debounce(gpio, debounce);
if (ret < 0)
return ret;
ctx->cd_debounce_delay_ms = debounce;
}
ctx->override_cd_active_level = true;