linux-kernel - [PATCH AUTOSEL 6.14 16/23] clk: renesas: rzv2h: Adjust for CPG_BUS_m

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Message-Id: <20250404000402.2688049-16-sashal@kernel.org>
Date: Thu,  3 Apr 2025 20:03:53 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Biju Das <biju.das.jz@...renesas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Sasha Levin <sashal@...nel.org>,
	mturquette@...libre.com,
	sboyd@...nel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org
Subject: [PATCH AUTOSEL 6.14 16/23] clk: renesas: rzv2h: Adjust for CPG_BUS_m_MSTOP starting from m = 1

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

[ Upstream commit 69ac2acd209a15bd7a61a15c9532a5b505252e1c ]

Avoid using the "- 1" for finding mstop_index in all functions accessing
priv->mstop_count, by adjusting its pointer in rzv2h_cpg_probe().

While at it, drop the intermediate local variable index.

Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
Closes: https://lore.kernel.org/all/CAMuHMdX1gPNCFddg_DyK7Bv0BeFLOLi=5eteT_HhMH=Ph2wVvA@mail.gmail.com/
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Link: https://lore.kernel.org/20250222142009.41324-1-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/renesas/rzv2h-cpg.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/renesas/rzv2h-cpg.c b/drivers/clk/renesas/rzv2h-cpg.c
index a4c1e92e1fd76..4e81a0bae0228 100644
--- a/drivers/clk/renesas/rzv2h-cpg.c
+++ b/drivers/clk/renesas/rzv2h-cpg.c
@@ -447,8 +447,7 @@ static void rzv2h_mod_clock_mstop_enable(struct rzv2h_cpg_priv *priv,
 {
 	unsigned long mstop_mask = FIELD_GET(BUS_MSTOP_BITS_MASK, mstop_data);
 	u16 mstop_index = FIELD_GET(BUS_MSTOP_IDX_MASK, mstop_data);
-	unsigned int index = (mstop_index - 1) * 16;
-	atomic_t *mstop = &priv->mstop_count[index];
+	atomic_t *mstop = &priv->mstop_count[mstop_index * 16];
 	unsigned long flags;
 	unsigned int i;
 	u32 val = 0;
@@ -469,8 +468,7 @@ static void rzv2h_mod_clock_mstop_disable(struct rzv2h_cpg_priv *priv,
 {
 	unsigned long mstop_mask = FIELD_GET(BUS_MSTOP_BITS_MASK, mstop_data);
 	u16 mstop_index = FIELD_GET(BUS_MSTOP_IDX_MASK, mstop_data);
-	unsigned int index = (mstop_index - 1) * 16;
-	atomic_t *mstop = &priv->mstop_count[index];
+	atomic_t *mstop = &priv->mstop_count[mstop_index * 16];
 	unsigned long flags;
 	unsigned int i;
 	u32 val = 0;
@@ -630,8 +628,7 @@ rzv2h_cpg_register_mod_clk(const struct rzv2h_mod_clk *mod,
 	} else if (clock->mstop_data != BUS_MSTOP_NONE && mod->critical) {
 		unsigned long mstop_mask = FIELD_GET(BUS_MSTOP_BITS_MASK, clock->mstop_data);
 		u16 mstop_index = FIELD_GET(BUS_MSTOP_IDX_MASK, clock->mstop_data);
-		unsigned int index = (mstop_index - 1) * 16;
-		atomic_t *mstop = &priv->mstop_count[index];
+		atomic_t *mstop = &priv->mstop_count[mstop_index * 16];
 		unsigned long flags;
 		unsigned int i;
 		u32 val = 0;
@@ -926,6 +923,9 @@ static int __init rzv2h_cpg_probe(struct platform_device *pdev)
 	if (!priv->mstop_count)
 		return -ENOMEM;
 
+	/* Adjust for CPG_BUS_m_MSTOP starting from m = 1 */
+	priv->mstop_count -= 16;
+
 	priv->resets = devm_kmemdup(dev, info->resets, sizeof(*info->resets) *
 				    info->num_resets, GFP_KERNEL);
 	if (!priv->resets)
-- 
2.39.5