The R-Car Gen3 HardWare Manual Errata for Rev. 1.00 (Jul 2, 2018) states that the USB30_OVC pin supports pull-up only. It has a bit assigned in the pull-enable register (PUEN5), but not in the pull-up/down control register (PUD5).
Add a check for this, to prevent configuring a prohibited setting. Reported-by: Yoshihiro Shimoda <[email protected]> Fixes: 83f6941a42a5e773 ("pinctrl: sh-pfc: r8a77990: Add bias pinconf support") Signed-off-by: Geert Uytterhoeven <[email protected]> --- To be queued in sh-pfc-for-v4.22. drivers/pinctrl/sh-pfc/pfc-r8a77990.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a77990.c b/drivers/pinctrl/sh-pfc/pfc-r8a77990.c index 8c06d72753890e32..784d4400c3e0e7ea 100644 --- a/drivers/pinctrl/sh-pfc/pfc-r8a77990.c +++ b/drivers/pinctrl/sh-pfc/pfc-r8a77990.c @@ -4914,6 +4914,17 @@ static const struct pinmux_bias_reg pinmux_bias_regs[] = { { /* sentinel */ }, }; +static bool pin_has_pud(unsigned int pin) +{ + /* Some pins are pull-up only */ + switch (pin) { + case RCAR_GP_PIN(6, 9): /* USB30_OVC */ + return false; + } + + return true; +} + static unsigned int r8a77990_pinmux_get_bias(struct sh_pfc *pfc, unsigned int pin) { @@ -4926,7 +4937,7 @@ static unsigned int r8a77990_pinmux_get_bias(struct sh_pfc *pfc, if (!(sh_pfc_read(pfc, reg->puen) & BIT(bit))) return PIN_CONFIG_BIAS_DISABLE; - else if (sh_pfc_read(pfc, reg->pud) & BIT(bit)) + else if (!pin_has_pud(pin) || (sh_pfc_read(pfc, reg->pud) & BIT(bit))) return PIN_CONFIG_BIAS_PULL_UP; else return PIN_CONFIG_BIAS_PULL_DOWN; @@ -4947,11 +4958,13 @@ static void r8a77990_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin, if (bias != PIN_CONFIG_BIAS_DISABLE) enable |= BIT(bit); - updown = sh_pfc_read(pfc, reg->pud) & ~BIT(bit); - if (bias == PIN_CONFIG_BIAS_PULL_UP) - updown |= BIT(bit); + if (pin_has_pud(pin)) { + updown = sh_pfc_read(pfc, reg->pud) & ~BIT(bit); + if (bias == PIN_CONFIG_BIAS_PULL_UP) + updown |= BIT(bit); - sh_pfc_write(pfc, reg->pud, updown); + sh_pfc_write(pfc, reg->pud, updown); + } sh_pfc_write(pfc, reg->puen, enable); } -- 2.17.1
