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mmc: core: Factor out mmc_host_set_uhs_voltage() 

Factor out mmc_host_set_uhs_voltage() so it can be reused.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2017-09-25 11:29:03 +03:00 committed by Ulf Hansson
parent cb39f61e9b
commit 3f496afb6f
2 changed files with 25 additions and 14 deletions
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38
drivers/mmc/core/core.c
View File

@ -1672,11 +1672,33 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
}
int mmc_host_set_uhs_voltage(struct mmc_host *host)
{
u32 clock;
/*
* During a signal voltage level switch, the clock must be gated
* for 5 ms according to the SD spec
*/
clock = host->ios.clock;
host->ios.clock = 0;
mmc_set_ios(host);
if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
return -EAGAIN;
/* Keep clock gated for at least 10 ms, though spec only says 5 ms */
mmc_delay(10);
host->ios.clock = clock;
mmc_set_ios(host);
return 0;
}
int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
{
struct mmc_command cmd = {};
int err = 0;
u32 clock;
/*
* If we cannot switch voltages, return failure so the caller
@ -1708,15 +1730,8 @@ int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
err = -EAGAIN;
goto power_cycle;
}
/*
* During a signal voltage level switch, the clock must be gated
* for 5 ms according to the SD spec
*/
clock = host->ios.clock;
host->ios.clock = 0;
mmc_set_ios(host);
if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180)) {
if (mmc_host_set_uhs_voltage(host)) {
/*
* Voltages may not have been switched, but we've already
* sent CMD11, so a power cycle is required anyway
@ -1725,11 +1740,6 @@ int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
goto power_cycle;
}
/* Keep clock gated for at least 10 ms, though spec only says 5 ms */
mmc_delay(10);
host->ios.clock = clock;
mmc_set_ios(host);
/* Wait for at least 1 ms according to spec */
mmc_delay(1);

1
drivers/mmc/core/core.h
View File

@ -49,6 +49,7 @@ void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr);
int mmc_host_set_uhs_voltage(struct mmc_host *host);
int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);
void mmc_set_timing(struct mmc_host *host, unsigned int timing);
void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type);