soc/fsl/fsl_esai.c

161  * @ratio: desired overall ratio for the paticipating dividers
165 static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
176 	if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) {
177 		dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n",
180 	} else if (ratio % 2) {
185 	ratio /= 2;
187 	psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8;
189 	/* Do not loop-search if PM (1 ~ 256) alone can serve the ratio */
190 	if (ratio <= 256) {
191 		pm = ratio;
205 			if (prod == ratio)
207 			else if (prod / ratio == 1)
208 				sub = prod - ratio;
209 			else if (ratio / prod == 1)
210 				sub = ratio - prod;
215 			sub = sub * 1000 / ratio;
266 	u32 ratio, ecr = 0;
312 	ratio = clk_rate / freq;
313 	if (ratio * freq > clk_rate)
314 		ret = ratio * freq - clk_rate;
315 	else if (ratio * freq < clk_rate)
316 		ret = clk_rate - ratio * freq;
328 	if (ratio == 1 && clksrc == esai_priv->extalclk) {
332 	} else if (ratio < 2) {
333 		/* The ratio should be no less than 2 if using other sources */
339 	ret = fsl_esai_divisor_cal(dai, tx, ratio, false, 0);
366 	u32 sub, ratio = hck_rate / freq;
373 	if (ratio * freq > hck_rate)
374 		sub = ratio * freq - hck_rate;
375 	else if (ratio * freq < hck_rate)
376 		sub = hck_rate - ratio * freq;
387 	/* The ratio should be contented by FP alone if bypassing PM and PSR */
388 	if (!esai_priv->sck_div[tx] && (ratio > 16 || ratio == 0)) {
389 		dev_err(dai->dev, "the ratio is out of range (1 ~ 16)\n");
393 	ret = fsl_esai_divisor_cal(dai, tx, ratio, true,
394 			esai_priv->sck_div[tx] ? 0 : ratio);