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Subject[PATCH v2 3/7] clk: qcom: clk-alpha-pll: Refactor and cleanup trion PLL
Date
From: Taniya Das <tdas@codeaurora.org>

The PLL run and standby modes are similar across the PLLs, thus rename
and refactor the code accordingly.

Remove duplicate function for calculating the round rate of PLL and also
update the trion pll ops to use the common function.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
---
drivers/clk/qcom/clk-alpha-pll.c | 71 +++++++++++++---------------------------
1 file changed, 22 insertions(+), 49 deletions(-)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 7c2936d..1b073b2 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -134,15 +134,10 @@
#define PLL_HUAYRA_N_MASK 0xff
#define PLL_HUAYRA_ALPHA_WIDTH 16

-#define FABIA_OPMODE_STANDBY 0x0
-#define FABIA_OPMODE_RUN 0x1
-
-#define FABIA_PLL_OUT_MASK 0x7
-#define FABIA_PLL_RATE_MARGIN 500
-
-#define TRION_PLL_STANDBY 0x0
-#define TRION_PLL_RUN 0x1
-#define TRION_PLL_OUT_MASK 0x7
+#define PLL_STANDBY 0x0
+#define PLL_RUN 0x1
+#define PLL_OUT_MASK 0x7
+#define PLL_RATE_MARGIN 500

#define pll_alpha_width(p) \
((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ? \
@@ -765,7 +760,7 @@ static int trion_pll_is_enabled(struct clk_alpha_pll *pll,
if (ret)
return 0;

- return ((opmode_regval & TRION_PLL_RUN) && (mode_regval & PLL_OUTCTRL));
+ return ((opmode_regval & PLL_RUN) && (mode_regval & PLL_OUTCTRL));
}

static int clk_trion_pll_is_enabled(struct clk_hw *hw)
@@ -795,7 +790,7 @@ static int clk_trion_pll_enable(struct clk_hw *hw)
}

/* Set operation mode to RUN */
- regmap_write(regmap, PLL_OPMODE(pll), TRION_PLL_RUN);
+ regmap_write(regmap, PLL_OPMODE(pll), PLL_RUN);

ret = wait_for_pll_enable_lock(pll);
if (ret)
@@ -803,7 +798,7 @@ static int clk_trion_pll_enable(struct clk_hw *hw)

/* Enable the PLL outputs */
ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
- TRION_PLL_OUT_MASK, TRION_PLL_OUT_MASK);
+ PLL_OUT_MASK, PLL_OUT_MASK);
if (ret)
return ret;

@@ -836,12 +831,12 @@ static void clk_trion_pll_disable(struct clk_hw *hw)

/* Disable the PLL outputs */
ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
- TRION_PLL_OUT_MASK, 0);
+ PLL_OUT_MASK, 0);
if (ret)
return;

/* Place the PLL mode in STANDBY */
- regmap_write(regmap, PLL_OPMODE(pll), TRION_PLL_STANDBY);
+ regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N);
}

@@ -849,33 +844,12 @@ static void clk_trion_pll_disable(struct clk_hw *hw)
clk_trion_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
- struct regmap *regmap = pll->clkr.regmap;
- u32 l, frac;
- u64 prate = parent_rate;
-
- regmap_read(regmap, PLL_L_VAL(pll), &l);
- regmap_read(regmap, PLL_ALPHA_VAL(pll), &frac);
-
- return alpha_pll_calc_rate(prate, l, frac, ALPHA_REG_16BIT_WIDTH);
-}
-
-static long clk_trion_pll_round_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long *prate)
-{
- struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
- unsigned long min_freq, max_freq;
- u32 l;
- u64 a;
-
- rate = alpha_pll_round_rate(rate, *prate,
- &l, &a, ALPHA_REG_16BIT_WIDTH);
- if (!pll->vco_table || alpha_pll_find_vco(pll, rate))
- return rate;
+ u32 l, frac, alpha_width = pll_alpha_width(pll);

- min_freq = pll->vco_table[0].min_freq;
- max_freq = pll->vco_table[pll->num_vco - 1].max_freq;
+ regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l);
+ regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL(pll), &frac);

- return clamp(rate, min_freq, max_freq);
+ return alpha_pll_calc_rate(parent_rate, l, frac, alpha_width);
}

const struct clk_ops clk_alpha_pll_fixed_ops = {
@@ -921,7 +895,7 @@ static long clk_trion_pll_round_rate(struct clk_hw *hw, unsigned long rate,
.disable = clk_trion_pll_disable,
.is_enabled = clk_trion_pll_is_enabled,
.recalc_rate = clk_trion_pll_recalc_rate,
- .round_rate = clk_trion_pll_round_rate,
+ .round_rate = clk_alpha_pll_round_rate,
};
EXPORT_SYMBOL_GPL(clk_trion_fixed_pll_ops);

@@ -1088,14 +1062,14 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw)
return ret;

/* Skip If PLL is already running */
- if ((opmode_val & FABIA_OPMODE_RUN) && (val & PLL_OUTCTRL))
+ if ((opmode_val & PLL_RUN) && (val & PLL_OUTCTRL))
return 0;

ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
if (ret)
return ret;

- ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY);
+ ret = regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
if (ret)
return ret;

@@ -1104,7 +1078,7 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw)
if (ret)
return ret;

- ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_RUN);
+ ret = regmap_write(regmap, PLL_OPMODE(pll), PLL_RUN);
if (ret)
return ret;

@@ -1113,7 +1087,7 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw)
return ret;

ret = regmap_update_bits(regmap, PLL_USER_CTL(pll),
- FABIA_PLL_OUT_MASK, FABIA_PLL_OUT_MASK);
+ PLL_OUT_MASK, PLL_OUT_MASK);
if (ret)
return ret;

@@ -1143,13 +1117,12 @@ static void alpha_pll_fabia_disable(struct clk_hw *hw)
return;

/* Disable main outputs */
- ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), FABIA_PLL_OUT_MASK,
- 0);
+ ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), PLL_OUT_MASK, 0);
if (ret)
return;

/* Place the PLL in STANDBY */
- regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY);
+ regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
}

static unsigned long alpha_pll_fabia_recalc_rate(struct clk_hw *hw,
@@ -1178,7 +1151,7 @@ static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate,
* Due to limited number of bits for fractional rate programming, the
* rounded up rate could be marginally higher than the requested rate.
*/
- if (rrate > (rate + FABIA_PLL_RATE_MARGIN) || rrate < rate) {
+ if (rrate > (rate + PLL_RATE_MARGIN) || rrate < rate) {
pr_err("Call set rate on the PLL with rounded rates!\n");
return -EINVAL;
}
@@ -1227,7 +1200,7 @@ static int alpha_pll_fabia_prepare(struct clk_hw *hw)
* Due to a limited number of bits for fractional rate programming, the
* rounded up rate could be marginally higher than the requested rate.
*/
- if (rrate > (cal_freq + FABIA_PLL_RATE_MARGIN) || rrate < cal_freq)
+ if (rrate > (cal_freq + PLL_RATE_MARGIN) || rrate < cal_freq)
return -EINVAL;

/* Setup PLL for calibration frequency */
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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