[PATCH 1/5] pinctrl: renesas: Fix save/restore on SoCs with pull-down only pins

[Geert Uytterhoeven <geert+renesas@xxxxxxxxx>]

If some bits in a pin Pull-Up control register (PUPR) control pin
pull-down instead of pin pull-up, there are two pinmux_bias_reg entries:
a first one with the puen field filled in, listing pins with pull-up
functionality, and a second one with the pud field filled in, listing
pins with pull-down functionality.  On encountering the second entry,
where puen is NULL, the for-loop terminates early, causing the remaining
bias registers not to be saved/restored during PSCI system suspend.
Fortunately this does not trigger on any supported system yet, as PSCI
is only used on R-Car Gen3 and RZ/G2 systems, which all have separate
pin Pull-Enable (PUEN) and pin Pull-Up/Down control (PUD) registers.

Avoid this ever becoming a problem by treating pinmux_bias_reg.puen and
pinmux_bias_reg.pud the same.  Note that a register controlling both
pull-up and pull-down pins would be saved and restored twice, which is
harmless.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
 drivers/pinctrl/renesas/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/renesas/core.c b/drivers/pinctrl/renesas/core.c
index ef8ef05ba93030b9..b0d6103d012e7821 100644
--- a/drivers/pinctrl/renesas/core.c
+++ b/drivers/pinctrl/renesas/core.c
@@ -675,8 +675,10 @@ static unsigned int sh_pfc_walk_regs(struct sh_pfc *pfc,
 			do_reg(pfc, pfc->info->drive_regs[i].reg, n++);
 
 	if (pfc->info->bias_regs)
-		for (i = 0; pfc->info->bias_regs[i].puen; i++) {
-			do_reg(pfc, pfc->info->bias_regs[i].puen, n++);
+		for (i = 0; pfc->info->bias_regs[i].puen ||
+			    pfc->info->bias_regs[i].pud; i++) {
+			if (pfc->info->bias_regs[i].puen)
+				do_reg(pfc, pfc->info->bias_regs[i].puen, n++);
 			if (pfc->info->bias_regs[i].pud)
 				do_reg(pfc, pfc->info->bias_regs[i].pud, n++);
 		}
-- 
2.25.1