linux-kernel - [PATCH 5.15 110/277] clk: si5341: fix reported clk

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Message-Id: <20220412062945.223193810@linuxfoundation.org>
Date:   Tue, 12 Apr 2022 08:28:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adam Wujek <dev_public@...ek.eu>,
        Robert Hancock <robert.hancock@...ian.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 110/277] clk: si5341: fix reported clk_rate when output divider is 2

From: Adam Wujek <dev_public@...ek.eu>

[ Upstream commit 2a8b539433e111c4de364237627ef219d2f6350a ]

SI5341_OUT_CFG_RDIV_FORCE2 shall be checked first to distinguish whether
a divider for a given output is set to 2 (SI5341_OUT_CFG_RDIV_FORCE2
is set) or the output is disabled (SI5341_OUT_CFG_RDIV_FORCE2 not set,
SI5341_OUT_R_REG is set 0).
Before the change, divider set to 2 (SI5341_OUT_R_REG set to 0) was
interpreted as output is disabled.

Signed-off-by: Adam Wujek <dev_public@...ek.eu>
Link: https://lore.kernel.org/r/20211203141125.2447520-1-dev_public@wujek.eu
Reviewed-by: Robert Hancock <robert.hancock@...ian.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/clk-si5341.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/clk-si5341.c b/drivers/clk/clk-si5341.c
index f7b41366666e..4de098b6b0d4 100644
--- a/drivers/clk/clk-si5341.c
+++ b/drivers/clk/clk-si5341.c
@@ -798,6 +798,15 @@ static unsigned long si5341_output_clk_recalc_rate(struct clk_hw *hw,
 	u32 r_divider;
 	u8 r[3];
 
+	err = regmap_read(output->data->regmap,
+			SI5341_OUT_CONFIG(output), &val);
+	if (err < 0)
+		return err;
+
+	/* If SI5341_OUT_CFG_RDIV_FORCE2 is set, r_divider is 2 */
+	if (val & SI5341_OUT_CFG_RDIV_FORCE2)
+		return parent_rate / 2;
+
 	err = regmap_bulk_read(output->data->regmap,
 			SI5341_OUT_R_REG(output), r, 3);
 	if (err < 0)
@@ -814,13 +823,6 @@ static unsigned long si5341_output_clk_recalc_rate(struct clk_hw *hw,
 	r_divider += 1;
 	r_divider <<= 1;
 
-	err = regmap_read(output->data->regmap,
-			SI5341_OUT_CONFIG(output), &val);
-	if (err < 0)
-		return err;
-
-	if (val & SI5341_OUT_CFG_RDIV_FORCE2)
-		r_divider = 2;
 
 	return parent_rate / r_divider;
 }
-- 
2.35.1