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| author | Jaehoon Chung <jh80.chung@samsung.com> | 2012-01-16 17:49:01 +0900 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-02-13 20:39:01 -0500 |
| commit | 6e8201f57c9359c9c5dc8f9805c15a4392492a10 (patch) | |
| tree | c936936d165e2fd134d657e569754460acebb26e /drivers | |
| parent | 7488e924b55002e70f6d8d181f146edac3006b9f (diff) | |
| download | linux-6e8201f57c9359c9c5dc8f9805c15a4392492a10.tar.gz linux-6e8201f57c9359c9c5dc8f9805c15a4392492a10.tar.bz2 linux-6e8201f57c9359c9c5dc8f9805c15a4392492a10.zip | |
mmc: core: add the capability for broken voltage
There is an understood mismatch between the voltage the host controller is
set to and the voltage supplied to the card by a fixed voltage regulator.
Teaching the driver to accept the mismatch is overly complicated. Instead
just accept the regulator's voltage.
This patch adds MMC_CAP2_BROKEN_VOLTAGE.
If the voltage didn't satisfy between min_uV and max_uV, try to change
the voltage in core.c. When changing the voltage, maybe use
regulator_set_voltage().
In regulator_set_voltage(), check the below condition.
/* sanity check */
if (!rdev->desc->ops->set_voltage &&
!rdev->desc->ops->set_voltage_sel) {
ret = -EINVAL;
goto out;
}
If some board should use the fixed-regulator, always return -EINVAL.
Then, eMMC didn't initialize always.
So if use a fixed-regulator, we need to add the MMC_CAP2_BROKEN_VOLTAGE.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/core/core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index b3063b741df3..18661554e79c 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1131,6 +1131,10 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc, * might not allow this operation */ voltage = regulator_get_voltage(supply); + + if (mmc->caps2 & MMC_CAP2_BROKEN_VOLTAGE) + min_uV = max_uV = voltage; + if (voltage < 0) result = voltage; else if (voltage < min_uV || voltage > max_uV) |