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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-10-14 13:46:38 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-18 19:20:26 +0100 |
| commit | c0be7a34c8897779236fdbeb68a3aff0668116d9 (patch) | |
| tree | f7fe54131c608badd8f021a35c64bf26ef61fdce | |
| parent | 88ccabbd2066a619ea0794a86397b5b1454a29e3 (diff) | |
| download | linux-stable-c0be7a34c8897779236fdbeb68a3aff0668116d9.tar.gz linux-stable-c0be7a34c8897779236fdbeb68a3aff0668116d9.tar.bz2 linux-stable-c0be7a34c8897779236fdbeb68a3aff0668116d9.zip | |
pinctrl: intel: Set default bias in case no particular value given
[ 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>
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-intel.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c index 83981ad66a71..4e89bbf6b76a 100644 --- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -662,6 +662,10 @@ static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int 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; @@ -684,6 +688,10 @@ static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int 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; |