diff mbox series

[v12,07/10] soc: qcom: cpr: Use u64 for frequency

Message ID 20230217-topic-cpr3h-v12-7-1a4d050e1e67@linaro.org
State Superseded
Headers show
Series (no cover subject) | expand

Commit Message

Konrad Dybcio June 28, 2023, 2 p.m. UTC 
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        |  8 ++++----
 3 files changed, 15 insertions(+), 15 deletions(-)

Comments

AngeloGioacchino Del Regno July 4, 2023, 11:04 a.m. UTC | #1 
Il 28/06/23 16:00, Konrad Dybcio ha scritto:
> 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>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
diff mbox series

Patch

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..49c33b13b82b 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;
 
@@ -867,7 +867,7 @@  static int cpr_corner_init(struct cpr_drv *drv)
 		cdata[level - 1].freq = freq;
 
 		fuse = &drv->fuse_corners[fnum];
-		dev_dbg(drv->dev, "freq: %lu level: %u fuse level: %u\n",
+		dev_dbg(drv->dev, "freq: %llu level: %u fuse level: %u\n",
 			freq, dev_pm_opp_get_level(opp) - 1, fnum);
 		if (freq > fuse->max_freq)
 			fuse->max_freq = freq;
@@ -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);