[PATCH 6.18 318/752] clk: renesas: rzg2l: Deassert reset on assert timeout

Sasha Levin
2026-02-28T17:52:34Z

From: Biju Das <biju.das.jz@bp.renesas.com>

[ Upstream commit 0b0201f259e1158a875c5fd01adf318ae5d32352 ]

If the assert() fails due to timeout error, set the reset register bit
back to deasserted state. This change is needed especially for handling
assert error in suspend() callback that expect the device to be in
operational state in case of failure.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260108123433.104464-2-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/renesas/rzg2l-cpg.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c
index 07909e80bae24..db85b1b43737b 100644
--- a/drivers/clk/renesas/rzg2l-cpg.c
+++ b/drivers/clk/renesas/rzg2l-cpg.c
@@ -1647,6 +1647,7 @@ static int __rzg2l_cpg_assert(struct reset_controller_dev *rcdev,
u32 mask = BIT(info->resets[id].bit);
s8 monbit = info->resets[id].monbit;
u32 value = mask << 16;
+ u32 mon;
int ret;

dev_dbg(rcdev->dev, "%s id:%ld offset:0x%x\n",
@@ -1667,10 +1668,10 @@ static int __rzg2l_cpg_assert(struct reset_controller_dev *rcdev,
return 0;
}

- ret = readl_poll_timeout_atomic(priv->base + reg, value,
- assert == !!(value & mask), 10, 200);
- if (ret && !assert) {
- value = mask << 16;
+ ret = readl_poll_timeout_atomic(priv->base + reg, mon,
+ assert == !!(mon & mask), 10, 200);
+ if (ret) {
+ value ^= mask;
writel(value, priv->base + CLK_RST_R(info->resets[id].off));
}

--
2.51.0