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From:   Konrad Dybcio <konrad.dybcio@linaro.org>
Date:   Tue, 27 Jun 2023 20:30:42 +0200
Subject: [PATCH v11 6/9] soc: qcom: cpr: Use u64 for frequency
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Message-Id: <20230217-topic-cpr3h-v11-6-ba22b4daa5d6@linaro.org>
References: <20230217-topic-cpr3h-v11-0-ba22b4daa5d6@linaro.org>
In-Reply-To: <20230217-topic-cpr3h-v11-0-ba22b4daa5d6@linaro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Niklas Cassel <nks@flawful.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Conor Dooley <conor+dt@kernel.org>
Cc:     Robert Marko <robimarko@gmail.com>, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-pm@vger.kernel.org,
        Marijn Suijten <marijn.suijten@somainline.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>
Precedence: bulk

32 bits is not enough for over-2.changeGHz frequencies. Move all variables
that operate on Hz to u64 to avoid overflows.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/soc/qcom/cpr-common.c | 13 +++++++------
 drivers/soc/qcom/cpr-common.h |  9 ++++-----
 drivers/soc/qcom/cpr.c        |  6 +++---
 3 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/soc/qcom/cpr-common.c b/drivers/soc/qcom/cpr-common.c
index 44c681bbbf13..3e3a4a61cfde 100644
--- a/drivers/soc/qcom/cpr-common.c
+++ b/drivers/soc/qcom/cpr-common.c
@@ -218,7 +218,7 @@ unsigned int cpr_get_fuse_corner(struct dev_pm_opp *opp)
 }
 EXPORT_SYMBOL_GPL(cpr_get_fuse_corner);
 
-unsigned long cpr_get_opp_hz_for_req(struct dev_pm_opp *ref,
+u64 cpr_get_opp_hz_for_req(struct dev_pm_opp *ref,
 				     struct device *cpu_dev)
 {
 	u64 rate = 0;
@@ -250,7 +250,7 @@ unsigned long cpr_get_opp_hz_for_req(struct dev_pm_opp *ref,
 out_ref:
 	of_node_put(desc_np);
 
-	return (unsigned long) rate;
+	return rate;
 }
 EXPORT_SYMBOL_GPL(cpr_get_opp_hz_for_req);
 
@@ -260,7 +260,7 @@ int cpr_calculate_scaling(struct device *dev,
 			  const struct corner *corner)
 {
 	u32 quot_diff = 0;
-	unsigned long freq_diff;
+	u64 freq_diff;
 	int scaling;
 	const struct fuse_corner *fuse, *prev_fuse;
 	int ret;
@@ -280,8 +280,9 @@ int cpr_calculate_scaling(struct device *dev,
 	}
 
 	freq_diff = fuse->max_freq - prev_fuse->max_freq;
-	freq_diff /= 1000000; /* Convert to MHz */
-	scaling = 1000 * quot_diff / freq_diff;
+	freq_diff = div_u64(freq_diff, 1000000); /* Convert to MHz */
+	scaling = 1000 * quot_diff;
+	do_div(scaling, freq_diff);
 	return min(scaling, fdata->max_quot_scale);
 }
 EXPORT_SYMBOL_GPL(cpr_calculate_scaling);
@@ -289,7 +290,7 @@ EXPORT_SYMBOL_GPL(cpr_calculate_scaling);
 int cpr_interpolate(const struct corner *corner, int step_volt,
 		    const struct fuse_corner_data *fdata)
 {
-	unsigned long f_high, f_low, f_diff;
+	u64 f_high, f_low, f_diff;
 	int uV_high, uV_low, uV;
 	u64 temp, temp_limit;
 	const struct fuse_corner *fuse, *prev_fuse;
diff --git a/drivers/soc/qcom/cpr-common.h b/drivers/soc/qcom/cpr-common.h
index 0aa227617d2f..1b2fa344eb09 100644
--- a/drivers/soc/qcom/cpr-common.h
+++ b/drivers/soc/qcom/cpr-common.h
@@ -42,7 +42,7 @@ struct fuse_corner {
 	int step_quot;
 	const struct reg_sequence *accs;
 	int num_accs;
-	unsigned long max_freq;
+	u64 max_freq;
 	u8 ring_osc_idx;
 };
 
@@ -54,13 +54,13 @@ struct corner {
 	int quot_adjust;
 	u32 save_ctl;
 	u32 save_irq;
-	unsigned long freq;
+	u64 freq;
 	struct fuse_corner *fuse_corner;
 };
 
 struct corner_data {
 	unsigned int fuse_corner;
-	unsigned long freq;
+	u64 freq;
 };
 
 struct acc_desc {
@@ -92,8 +92,7 @@ int cpr_populate_fuse_common(struct device *dev,
 int cpr_find_initial_corner(struct device *dev, struct clk *cpu_clk,
 			    struct corner *corners, int num_corners);
 u32 cpr_get_fuse_corner(struct dev_pm_opp *opp);
-unsigned long cpr_get_opp_hz_for_req(struct dev_pm_opp *ref,
-				     struct device *cpu_dev);
+u64 cpr_get_opp_hz_for_req(struct dev_pm_opp *ref, struct device *cpu_dev);
 int cpr_calculate_scaling(struct device *dev,
 			  const char *quot_offset,
 			  const struct fuse_corner_data *fdata,
diff --git a/drivers/soc/qcom/cpr.c b/drivers/soc/qcom/cpr.c
index cc1e4c462d1f..33066b8b2811 100644
--- a/drivers/soc/qcom/cpr.c
+++ b/drivers/soc/qcom/cpr.c
@@ -827,8 +827,8 @@ static int cpr_corner_init(struct cpr_drv *drv)
 	struct corner_data *cdata;
 	const struct fuse_corner_data *fdata;
 	bool apply_scaling;
-	unsigned long freq_diff, freq_diff_mhz;
-	unsigned long freq;
+	unsigned long freq_diff_mhz;
+	u64 freq, freq_diff;
 	int step_volt = regulator_get_linear_step(drv->vdd_apc);
 	struct dev_pm_opp *opp;
 
@@ -941,7 +941,7 @@ static int cpr_corner_init(struct cpr_drv *drv)
 
 		if (apply_scaling) {
 			freq_diff = fuse->max_freq - corner->freq;
-			freq_diff_mhz = freq_diff / 1000000;
+			freq_diff_mhz = (u32)div_u64(freq_diff, 1000000);
 			corner->quot_adjust = scaling * freq_diff_mhz / 1000;
 
 			corner->uV = cpr_interpolate(corner, step_volt, fdata);

-- 
2.41.0