This patch is added the MMC_CAP2_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."
if the voltage didn't satisfy between min_uV and max_uV,
try to change the voltage in core.c.
When change the voltage, maybe use the 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 the fixed-regulator or etc, we need to add the MMC_CAP2_BROKEN_VOLTAGE.
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/mmc/core/core.c | 4 ++++
include/linux/mmc/host.h | 1 +
2 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index bec0bf2..6848789 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1121,6 +1121,10 @@ 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)
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index dd13e05..5659aee 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 */
--
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