diff options
| author | Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> | 2026-05-13 14:53:12 +0300 |
|---|---|---|
| committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2026-05-25 13:00:23 +0300 |
| commit | f9fb67bc77d322568bf573e81335be0e9be2a7c8 (patch) | |
| tree | 8efd682f312245beffea3756d3bf85d085adcf79 | |
| parent | ccf707ca74cbb1d7ad0f99877518d2e3fe58611a (diff) | |
| download | linux-f9fb67bc77d322568bf573e81335be0e9be2a7c8.tar.xz | |
pinctrl: renesas: rzt2h: Skip PFC mode configuration if already set
In rzt2h_pinctrl_set_pfc_mode(), read the PMC and PFC registers upfront
and skip the pin function configuration if the pin is already in
peripheral mode with the desired function.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260513115312.1574367-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
| -rw-r--r-- | drivers/pinctrl/renesas/pinctrl-rzt2h.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/pinctrl/renesas/pinctrl-rzt2h.c b/drivers/pinctrl/renesas/pinctrl-rzt2h.c index 4b790fa72b49..eb70aee39f1a 100644 --- a/drivers/pinctrl/renesas/pinctrl-rzt2h.c +++ b/drivers/pinctrl/renesas/pinctrl-rzt2h.c @@ -191,6 +191,12 @@ static void rzt2h_pinctrl_set_pfc_mode(struct rzt2h_pinctrl *pctrl, guard(raw_spinlock_irqsave)(&pctrl->lock); + reg64 = rzt2h_pinctrl_readq(pctrl, port, PFC(port)); + /* Check if pin is already configured to the desired function */ + if ((rzt2h_pinctrl_readb(pctrl, port, PMC(port)) & BIT(pin)) && + field_get(PFC_PIN_MASK(pin), reg64) == func) + return; + /* Set pin to 'Non-use (Hi-Z input protection)' */ reg16 = rzt2h_pinctrl_readw(pctrl, port, PM(port)); reg16 &= ~PM_PIN_MASK(pin); @@ -200,7 +206,6 @@ static void rzt2h_pinctrl_set_pfc_mode(struct rzt2h_pinctrl *pctrl, rzt2h_pinctrl_set_gpio_en(pctrl, port, pin, true); /* Select Pin function mode with PFC register */ - reg64 = rzt2h_pinctrl_readq(pctrl, port, PFC(port)); reg64 &= ~PFC_PIN_MASK(pin); rzt2h_pinctrl_writeq(pctrl, port, reg64 | ((u64)func << (pin * 8)), PFC(port)); |