sound/soc/fsl/fsl_utils.c

Source file repositories/reference/linux-study-clean/sound/soc/fsl/fsl_utils.c

File Facts

System
Linux kernel
Corpus path
sound/soc/fsl/fsl_utils.c
Extension
.c
Size
8712 bytes
Lines
334
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

clk_is_match(pp, pll11k_clk)) {
			pll = pp;
			break;
		}
		p = pp;
	}

	npll = (do_div(ratio, 8000) ? pll11k_clk : pll8k_clk);
	reparent = (pll && !clk_is_match(pll, npll));

	if (reparent) {
		ret = clk_set_parent(p, npll);
		if (ret < 0)
			dev_warn(dev, "failed to set parent:%d\n", ret);
	}
}
EXPORT_SYMBOL(fsl_asoc_reparent_pll_clocks);

/**
 * fsl_asoc_constrain_rates - constrain rates according to clocks
 *
 * @target_constr: target constraint
 * @original_constr: original constraint
 * @pll8k_clk: PLL clock pointer for 8kHz
 * @pll11k_clk: PLL clock pointer for 11kHz
 * @ext_clk: External clock pointer
 * @target_rates: target rates array
 *
 * This function constrain rates according to clocks
 */
void fsl_asoc_constrain_rates(struct snd_pcm_hw_constraint_list *target_constr,
			      const struct snd_pcm_hw_constraint_list *original_constr,
			      struct clk *pll8k_clk, struct clk *pll11k_clk,
			      struct clk *ext_clk, int *target_rates)
{
	int i, j, k = 0;
	u64 clk_rate[3];

	*target_constr = *original_constr;
	if (pll8k_clk || pll11k_clk || ext_clk) {
		target_constr->list = target_rates;
		target_constr->count = 0;
		for (i = 0; i < original_constr->count; i++) {
			clk_rate[0] = clk_get_rate(pll8k_clk);
			clk_rate[1] = clk_get_rate(pll11k_clk);
			clk_rate[2] = clk_get_rate(ext_clk);
			for (j = 0; j < 3; j++) {
				if (clk_rate[j] != 0 &&
				    do_div(clk_rate[j], original_constr->list[i]) == 0) {
					target_rates[k++] = original_constr->list[i];
					target_constr->count++;
					break;
				}
			}
		}

		/* protection for if there is no proper rate found*/
		if (!target_constr->count)
			*target_constr = *original_constr;
	}
}
EXPORT_SYMBOL(fsl_asoc_constrain_rates);

/*
 * Below functions are used by mixer interface to avoid accessing registers
 * which are volatile at pm runtime suspend state (cache_only is enabled).
 */
int fsl_asoc_get_xr_sx(struct snd_kcontrol *kcontrol,
		       struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
	int ret = 0;

	ret = pm_runtime_resume_and_get(component->dev);
	if (ret)
		return ret;

	ret = snd_soc_get_xr_sx(kcontrol, ucontrol);

	pm_runtime_put_autosuspend(component->dev);

	return ret;
}
EXPORT_SYMBOL_GPL(fsl_asoc_get_xr_sx);

int fsl_asoc_put_xr_sx(struct snd_kcontrol *kcontrol,
		       struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
	int ret = 0;

Annotation

Implementation Notes