diff mbox series

[4.14,34/85] pinctrl: intel: Set default bias in case no particular value given

Message ID 20201117122112.699344401@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Nov. 17, 2020, 1:05 p.m. UTC 
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

[ Upstream commit f3c75e7a9349d1d33eb53ddc1b31640994969f73 ]

When GPIO library asks pin control to set the bias, it doesn't pass
any value of it and argument is considered boolean (and this is true
for ACPI GpioIo() / GpioInt() resources, by the way). Thus, individual
drivers must behave well, when they got the resistance value of 1 Ohm,
i.e. transforming it to sane default.

In case of Intel pin control hardware the 5 kOhm sounds plausible
because on one hand it's a minimum of resistors present in all
hardware generations and at the same time it's high enough to minimize
leakage current (will be only 200 uA with the above choice).

Fixes: e57725eabf87 ("pinctrl: intel: Add support for hardware debouncer")
Reported-by: Jamie McClymont <jamie@kwiius.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pinctrl/intel/pinctrl-intel.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 71df0f70b61f0..45b062b0d4188 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -602,6 +602,10 @@  static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin,
 
 		value |= PADCFG1_TERM_UP;
 
+		/* Set default strength value in case none is given */
+		if (arg == 1)
+			arg = 5000;
+
 		switch (arg) {
 		case 20000:
 			value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
@@ -624,6 +628,10 @@  static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin,
 	case PIN_CONFIG_BIAS_PULL_DOWN:
 		value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK);
 
+		/* Set default strength value in case none is given */
+		if (arg == 1)
+			arg = 5000;
+
 		switch (arg) {
 		case 20000:
 			value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;