linux-kernel - [PATCH v2 2/2] clk: qcom: clk-alpha-pll: Update to use determine rate ops for PLL

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Date:   Wed,  2 Feb 2022 23:12:13 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette   <mturquette@...libre.com>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Taniya Das <tdas@...eaurora.org>
Subject: [PATCH v2 2/2] 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.

Fixes: 134b55b7e19f8 ("clk: qcom: support Huayra type Alpha PLL")
Signed-off-by: Taniya Das <tdas@...eaurora.org>
---
 drivers/clk/qcom/clk-alpha-pll.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 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);
--
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