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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 /include | |
| parent | 7488e924b55002e70f6d8d181f146edac3006b9f (diff) | |
| download | linux-0-day-6e8201f57c9359c9c5dc8f9805c15a4392492a10.tar.gz linux-0-day-6e8201f57c9359c9c5dc8f9805c15a4392492a10.tar.xz | |
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 'include')
| -rw-r--r-- | include/linux/mmc/host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 73e5ee8e9ca27..ee2b0363c0406 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -257,6 +257,7 @@ struct mmc_host { #define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */ #define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \ MMC_CAP2_HS200_1_2V_SDR) +#define MMC_CAP2_BROKEN_VOLTAGE (1 << 7) /* Use the broken voltage */ mmc_pm_flag_t pm_caps; /* supported pm features */ unsigned int power_notify_type; |