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mmc: sdhci-xenon: wait 5ms after set 1.8V signal enable

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According to SD spec 3.00 3.6.1 signal voltage switch
procedure step 6~8,
(6) Set 1.8V Signal Enable in the Host Control 2 register.
(7) Wait 5ms. 1.8V voltage regulator shall be stable within this period.
(8) If 1.8V Signal Enable is cleared by Host Controller, go to step (12).
Host should wait 5ms after set 1.8V signal enable bit in
Host Control 2 register and check if 1.8V is stable or not.

But current code checks this bit right after set it.
On some platforms with xenon controller found the bit is
cleared right away and host reports "1.8V regulator output
did not became stable" and 5ms delay can help.

Implement voltage_switch callback for xenon controller to add 5ms
delay to make sure the 1.8V signal enable bit is set by controller.

Signed-off-by: Zhoujie Wu <zjwu@marvell.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Zhoujie Wu 2017-12-18 14:38:47 -08:00 committed by Ulf Hansson
parent c4ba0e4abd
commit 8d876bf472
1 changed files with 7 additions and 0 deletions
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7
drivers/mmc/host/sdhci-xenon.c
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@ -230,7 +230,14 @@ static void xenon_set_power(struct sdhci_host *host, unsigned char mode,
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
}
static void xenon_voltage_switch(struct sdhci_host *host)
{
/* Wait for 5ms after set 1.8V signal enable bit */
usleep_range(5000, 5500);
}
static const struct sdhci_ops sdhci_xenon_ops = {
.voltage_switch = xenon_voltage_switch,
.set_clock = sdhci_set_clock,
.set_power = xenon_set_power,
.set_bus_width = sdhci_set_bus_width,