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 <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Fixes: 83f6941a42a5e773 ("pinctrl: sh-pfc: r8a77990: Add bias pinconf support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
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
