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Give it some love and fix those warnings where it makes sense. Also make stabilization time a named constant to get rid of the magic number in clk-cpu.c. No functional change. Signed-off-by: Sam Protsenko --- Changes in v3: - none Changes in v2: - none drivers/clk/samsung/clk-cpu.c | 65 ++++++++++++++++++----------------- 1 file changed, 33 insertions(+), 32 deletions(-) diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c index 3e62ade120c5..e02730776aaa 100644 --- a/drivers/clk/samsung/clk-cpu.c +++ b/drivers/clk/samsung/clk-cpu.c @@ -16,18 +16,18 @@ * of the SoC or supplied after the SoC characterization. * * The below implementation of the CPU clock allows the rate changes of the CPU - * clock and the corresponding rate changes of the auxillary clocks of the CPU + * clock and the corresponding rate changes of the auxiliary clocks of the CPU * domain. The platform clock driver provides a clock register configuration * for each configurable rate which is then used to program the clock hardware - * registers to acheive a fast co-oridinated rate change for all the CPU domain + * registers to achieve a fast coordinated rate change for all the CPU domain * clocks. * * On a rate change request for the CPU clock, the rate change is propagated - * upto the PLL supplying the clock to the CPU domain clock blocks. While the + * up to the PLL supplying the clock to the CPU domain clock blocks. While the * CPU domain PLL is reconfigured, the CPU domain clocks are driven using an * alternate clock source. If required, the alternate clock source is divided * down in order to keep the output clock rate within the previous OPP limits. -*/ + */ #include #include @@ -50,17 +50,19 @@ #define E5433_DIV_STAT_CPU0 0x500 #define E5433_DIV_STAT_CPU1 0x504 -#define E4210_DIV0_RATIO0_MASK 0x7 -#define E4210_DIV1_HPM_MASK (0x7 << 4) -#define E4210_DIV1_COPY_MASK (0x7 << 0) -#define E4210_MUX_HPM_MASK (1 << 20) +#define E4210_DIV0_RATIO0_MASK GENMASK(2, 0) +#define E4210_DIV1_HPM_MASK GENMASK(6, 4) +#define E4210_DIV1_COPY_MASK GENMASK(2, 0) +#define E4210_MUX_HPM_MASK BIT(20) #define E4210_DIV0_ATB_SHIFT 16 #define E4210_DIV0_ATB_MASK (DIV_MASK << E4210_DIV0_ATB_SHIFT) +/* Divider stabilization time, msec */ +#define MAX_STAB_TIME 10 #define MAX_DIV 8 -#define DIV_MASK 7 -#define DIV_MASK_ALL 0xffffffff -#define MUX_MASK 7 +#define DIV_MASK GENMASK(2, 0) +#define DIV_MASK_ALL GENMASK(31, 0) +#define MUX_MASK GENMASK(2, 0) /* * Helper function to wait until divider(s) have stabilized after the divider @@ -68,7 +70,7 @@ */ static void wait_until_divider_stable(void __iomem *div_reg, unsigned long mask) { - unsigned long timeout = jiffies + msecs_to_jiffies(10); + unsigned long timeout = jiffies + msecs_to_jiffies(MAX_STAB_TIME); do { if (!(readl(div_reg) & mask)) @@ -86,9 +88,9 @@ static void wait_until_divider_stable(void __iomem *div_reg, unsigned long mask) * value was changed. */ static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos, - unsigned long mux_value) + unsigned long mux_value) { - unsigned long timeout = jiffies + msecs_to_jiffies(10); + unsigned long timeout = jiffies + msecs_to_jiffies(MAX_STAB_TIME); do { if (((readl(mux_reg) >> mux_pos) & MUX_MASK) == mux_value) @@ -101,18 +103,18 @@ static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos, pr_err("%s: re-parenting mux timed-out\n", __func__); } -/* common round rate callback useable for all types of CPU clocks */ -static long exynos_cpuclk_round_rate(struct clk_hw *hw, - unsigned long drate, unsigned long *prate) +/* common round rate callback usable for all types of CPU clocks */ +static long exynos_cpuclk_round_rate(struct clk_hw *hw, unsigned long drate, + unsigned long *prate) { struct clk_hw *parent = clk_hw_get_parent(hw); *prate = clk_hw_round_rate(parent, drate); return *prate; } -/* common recalc rate callback useable for all types of CPU clocks */ +/* common recalc rate callback usable for all types of CPU clocks */ static unsigned long exynos_cpuclk_recalc_rate(struct clk_hw *hw, - unsigned long parent_rate) + unsigned long parent_rate) { /* * The CPU clock output (armclk) rate is the same as its parent @@ -135,7 +137,7 @@ static const struct clk_ops exynos_cpuclk_clk_ops = { * dividers to be programmed. */ static void exynos_set_safe_div(void __iomem *base, unsigned long div, - unsigned long mask) + unsigned long mask) { unsigned long div0; @@ -151,7 +153,6 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, { const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg; unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent); - unsigned long alt_div = 0, alt_div_mask = DIV_MASK; unsigned long div0, div1 = 0, mux_reg; unsigned long flags; @@ -187,6 +188,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, */ if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) { unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate); + unsigned long alt_div, alt_div_mask = DIV_MASK; alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1; WARN_ON(alt_div >= MAX_DIV); @@ -215,7 +217,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, if (cpuclk->flags & CLK_CPU_HAS_DIV1) { writel(div1, base + E4210_DIV_CPU1); wait_until_divider_stable(base + E4210_DIV_STAT_CPU1, - DIV_MASK_ALL); + DIV_MASK_ALL); } spin_unlock_irqrestore(cpuclk->lock, flags); @@ -263,7 +265,7 @@ static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata, * dividers to be programmed. */ static void exynos5433_set_safe_div(void __iomem *base, unsigned long div, - unsigned long mask) + unsigned long mask) { unsigned long div0; @@ -279,7 +281,6 @@ static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, { const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg; unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent); - unsigned long alt_div = 0, alt_div_mask = DIV_MASK; unsigned long div0, div1 = 0, mux_reg; unsigned long flags; @@ -309,6 +310,7 @@ static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, */ if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) { unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate); + unsigned long alt_div, alt_div_mask = DIV_MASK; alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1; WARN_ON(alt_div >= MAX_DIV); @@ -358,7 +360,7 @@ static int exynos5433_cpuclk_post_rate_change(struct clk_notifier_data *ndata, * notifications of the parent clock of cpuclk. */ static int exynos_cpuclk_notifier_cb(struct notifier_block *nb, - unsigned long event, void *data) + unsigned long event, void *data) { struct clk_notifier_data *ndata = data; struct exynos_cpuclk *cpuclk; @@ -381,7 +383,7 @@ static int exynos_cpuclk_notifier_cb(struct notifier_block *nb, * notifications of the parent clock of cpuclk. */ static int exynos5433_cpuclk_notifier_cb(struct notifier_block *nb, - unsigned long event, void *data) + unsigned long event, void *data) { struct clk_notifier_data *ndata = data; struct exynos_cpuclk *cpuclk; @@ -438,11 +440,10 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx, else cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb; - ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb); if (ret) { pr_err("%s: failed to register clock notifier for %s\n", - __func__, name); + __func__, name); goto free_cpuclk; } @@ -454,7 +455,7 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx, ret = clk_hw_register(NULL, &cpuclk->hw); if (ret) { - pr_err("%s: could not register cpuclk %s\n", __func__, name); + pr_err("%s: could not register cpuclk %s\n", __func__, name); goto free_cpuclk_data; } @@ -482,8 +483,8 @@ void __init samsung_clk_register_cpu(struct samsung_clk_provider *ctx, for (num_cfgs = 0; list->cfg[num_cfgs].prate != 0; ) num_cfgs++; - exynos_register_cpu_clock(ctx, list->id, list->name, hws[list->parent_id], - hws[list->alt_parent_id], list->offset, list->cfg, num_cfgs, - list->flags); + exynos_register_cpu_clock(ctx, list->id, list->name, + hws[list->parent_id], hws[list->alt_parent_id], + list->offset, list->cfg, num_cfgs, list->flags); } }