regulator: bd71837: Disable voltage monitoring for LDO3/4

There is a HW quirk in BD71837. The shutdown sequence timings for
bucks/LDOs which are enabled via register interface are changed.
At PMIC poweroff the voltage for BUCK6/7 is cut immediately at the
beginning of shut-down sequence. This causes LDO5/6 voltage
monitoring to detect under voltage and force PMIC to emergency
state instead of poweroff. Disable voltage monitoring for LDO5 and
LDO6 at probe to avoid this.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/regulator/bd71837-regulator.c b/drivers/regulator/bd71837-regulator.c
index 0f8ac8dec3e1..a1bd8aaf4d98 100644
--- a/drivers/regulator/bd71837-regulator.c
+++ b/drivers/regulator/bd71837-regulator.c
@@ -569,6 +569,25 @@ static int bd71837_probe(struct platform_device *pdev)
                         BD71837_REG_REGLOCK);
         }
 
+        /*
+         * There is a HW quirk in BD71837. The shutdown sequence timings for
+         * bucks/LDOs which are controlled via register interface are changed.
+         * At PMIC poweroff the voltage for BUCK6/7 is cut immediately at the
+         * beginning of shut-down sequence. As bucks 6 and 7 are parent
+         * supplies for LDO5 and LDO6 - this causes LDO5/6 voltage
+         * monitoring to errorneously detect under voltage and force PMIC to
+         * emergency state instead of poweroff. In order to avoid this we
+         * disable voltage monitoring for LDO5 and LDO6
+         */
+        err = regmap_update_bits(pmic->mfd->regmap, BD718XX_REG_MVRFLTMASK2,
+                                 BD718XX_LDO5_VRMON80 | BD718XX_LDO6_VRMON80,
+                                 BD718XX_LDO5_VRMON80 | BD718XX_LDO6_VRMON80);
+        if (err) {
+                dev_err(&pmic->pdev->dev,
+                        "Failed to disable voltage monitoring\n");
+                goto err;
+        }
+
         for (i = 0; i < ARRAY_SIZE(pmic_regulator_inits); i++) {
 
                 struct regulator_desc *desc;