linux-kernel - [PATCH v1] clk qcom: clk-alpha-pll: Update to use determine rate ops for PLL

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Message-Id: <20220124174805.31021-1-tdas@codeaurora.org>
Date:   Mon, 24 Jan 2022 23:18:05 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette   <mturquette@...libre.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Taniya Das <tdas@...eaurora.org>
Subject: [PATCH v1] clk qcom: clk-alpha-pll: Update to use determine rate ops for PLL

On 32 bit devices, where the PLL requires to support the frequency
beyond the range of the `long int` the round rate ops cannot support.
Thus update the clk_ops to use determine rate instead.

While at it also fix the code in RCG.

Signed-off-by: Taniya Das <tdas@...eaurora.org>
---
 drivers/clk/qcom/clk-alpha-pll.c | 21 +++++++++++++++++----
 drivers/clk/qcom/clk-rcg2.c      | 10 +++++-----
 2 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 4406cf609aae..4e2e93cd8c8b 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -812,12 +812,25 @@ static int alpha_pll_huayra_set_rate(struct clk_hw *hw, unsigned long rate,
 	return 0;
 }

-static long alpha_pll_huayra_round_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long *prate)
+static int alpha_pll_huayra_determine_rate(struct clk_hw *hw,
+					struct clk_rate_request *req)
 {
+	struct clk_hw *parent_hw;
+	unsigned long rrate, prate;
 	u32 l, a;

-	return alpha_huayra_pll_round_rate(rate, *prate, &l, &a);
+	parent_hw = clk_hw_get_parent(hw);
+	if (!parent_hw)
+		return -EINVAL;
+
+	prate = clk_hw_get_rate(parent_hw);
+	rrate = alpha_huayra_pll_round_rate(req->rate, prate, &l, &a);
+
+	req->best_parent_hw = parent_hw;
+	req->best_parent_rate = prate;
+	req->rate = rrate;
+
+	return 0;
 }

 static int trion_pll_is_enabled(struct clk_alpha_pll *pll,
@@ -946,7 +959,7 @@ const struct clk_ops clk_alpha_pll_huayra_ops = {
 	.disable = clk_alpha_pll_disable,
 	.is_enabled = clk_alpha_pll_is_enabled,
 	.recalc_rate = alpha_pll_huayra_recalc_rate,
-	.round_rate = alpha_pll_huayra_round_rate,
+	.determine_rate = alpha_pll_huayra_determine_rate,
 	.set_rate = alpha_pll_huayra_set_rate,
 };
 EXPORT_SYMBOL_GPL(clk_alpha_pll_huayra_ops);
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 036c8071c07a..19614ece4e9d 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -147,19 +147,19 @@ static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
 static unsigned long
 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
 {
+	u64 tmp = rate;
+
 	if (hid_div) {
-		rate *= 2;
-		rate /= hid_div + 1;
+		tmp *= 2;
+		do_div(tmp, hid_div + 1);
 	}

 	if (mode) {
-		u64 tmp = rate;
 		tmp *= m;
 		do_div(tmp, n);
-		rate = tmp;
 	}

-	return rate;
+	return tmp;
 }

 static unsigned long
--
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