The hard-coded 10ms delay in mmc_power_up came from
commit 79bccc5aefb4 ("mmc: increase power up delay"), which said "The TI
controller on Toshiba Tecra M5 needs more time to power up or the cards
will init incorrectly or not at all." But it's too engineering solution
for a special board but force all platforms to wait for that long time,
especially painful for mmc_power_up for eMMC when booting.
However, it's added since 2009, and we can't tell if other platforms
benefit from it. But in practise, the modern hardware are most likely to
have a stable power supply with 1ms after setting it for no matter PMIC
or discrete power. And more importnatly, most regulators implement the
callback of ->set_voltage_time_sel() for regulator core to wait for
specific period of time for the power supply to be stable, which means
once regulator_set_voltage_* return, the power should reach the the
minimum voltage that works for initialization. Of course, if there
are some other ways for host to power the card, we should allow them
to argue a suitable delay as well.
With this patch, we could assign the delay from firmware, or we could
assigne it via ->set_ios() callback from host drivers.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
Changes in v2:
- allow to assign zero delay from firmware suggested by Adrain
drivers/mmc/core/core.c | 4 ++--
drivers/mmc/core/host.c | 4 ++++
include/linux/mmc/host.h | 1 +
3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 121ce50..a52e9c2 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1658,7 +1658,7 @@ void mmc_power_up(struct mmc_host *host, u32 ocr)
* This delay should be sufficient to allow the power supply
* to reach the minimum voltage.
*/
- mmc_delay(10);
+ mmc_delay(host->ios.power_delay_ms);
mmc_pwrseq_post_power_on(host);
@@ -1671,7 +1671,7 @@ void mmc_power_up(struct mmc_host *host, u32 ocr)
* This delay must be at least 74 clock sizes, or 1 ms, or the
* time required to reach a stable voltage.
*/
- mmc_delay(10);
+ mmc_delay(host->ios.power_delay_ms);
}
void mmc_power_off(struct mmc_host *host)
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 64b03d6..00ddc15 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -338,6 +338,9 @@ int mmc_of_parse(struct mmc_host *host)
host->dsr_req = 0;
}
+ device_property_read_u32(dev, "power-delay-ms",
+ &host->ios.power_delay_ms);
+
return mmc_pwrseq_alloc(host);
}
@@ -403,6 +406,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->max_blk_count = PAGE_SIZE / 512;
host->fixed_drv_type = -EINVAL;
+ host->ios.power_delay_ms = 10;
return host;
}
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 7c6eaf6..efa9bab 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -22,6 +22,7 @@
struct mmc_ios {
unsigned int clock; /* clock rate */
unsigned short vdd;
+ unsigned int power_delay_ms; /* waiting for stable power */
/* vdd stores the bit number of the selected voltage range from below. */
--
1.9.1
--
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