linux-kernel - [PATCH 3/4] ASoC: fsl_xcvr: Add sample rate constraint

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Message-ID: <20241126115440.3929061-4-chancel.liu@nxp.com>
Date: Tue, 26 Nov 2024 20:54:39 +0900
From: Chancel Liu <chancel.liu@....com>
To: shengjiu.wang@...il.com,
	Xiubo.Lee@...il.com,
	festevam@...il.com,
	nicoleotsuka@...il.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-sound@...r.kernel.org
Cc: Chancel Liu <chancel.liu@....com>
Subject: [PATCH 3/4] ASoC: fsl_xcvr: Add sample rate constraint

Platforms like i.MX93/91 only have one audio PLL. Some sample rates are
not supported. If the PLL source is used for 8kHz series rates, then
11kHz series rates can't be supported. Use fsl_asoc_constrain_rates()
to constrain rates according to PLL sources. This constraint is merely
applicable to playback cases on SPDIF only platforms.

Signed-off-by: Chancel Liu <chancel.liu@....com>
---
 sound/soc/fsl/fsl_xcvr.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c
index 1e0bfd59d511..bc625f9fce61 100644
--- a/sound/soc/fsl/fsl_xcvr.c
+++ b/sound/soc/fsl/fsl_xcvr.c
@@ -19,6 +19,7 @@
 #include "imx-pcm.h"
 
 #define FSL_XCVR_CAPDS_SIZE	256
+#define SPDIF_NUM_RATES		7
 
 enum fsl_xcvr_pll_verison {
 	PLL_MX8MP,
@@ -55,6 +56,8 @@ struct fsl_xcvr {
 	u8 cap_ds[FSL_XCVR_CAPDS_SIZE];
 	struct work_struct work_rst;
 	spinlock_t lock; /* Protect hw_reset and trigger */
+	struct snd_pcm_hw_constraint_list spdif_constr_rates;
+	u32 spdif_constr_rates_list[SPDIF_NUM_RATES];
 };
 
 static const struct fsl_xcvr_pll_conf {
@@ -585,8 +588,12 @@ static int fsl_xcvr_startup(struct snd_pcm_substream *substream,
 	switch (xcvr->mode) {
 	case FSL_XCVR_MODE_SPDIF:
 	case FSL_XCVR_MODE_ARC:
-		ret = fsl_xcvr_constr(substream, &fsl_xcvr_spdif_channels_constr,
-				      &fsl_xcvr_spdif_rates_constr);
+		if (xcvr->soc_data->spdif_only && tx)
+			ret = fsl_xcvr_constr(substream, &fsl_xcvr_spdif_channels_constr,
+					      &xcvr->spdif_constr_rates);
+		else
+			ret = fsl_xcvr_constr(substream, &fsl_xcvr_spdif_channels_constr,
+					      &fsl_xcvr_spdif_rates_constr);
 		break;
 	case FSL_XCVR_MODE_EARC:
 		ret = fsl_xcvr_constr(substream, &fsl_xcvr_earc_channels_constr,
@@ -1405,6 +1412,15 @@ static int fsl_xcvr_probe(struct platform_device *pdev)
 	fsl_asoc_get_pll_clocks(dev, &xcvr->pll8k_clk,
 				&xcvr->pll11k_clk);
 
+	if (xcvr->soc_data->spdif_only) {
+		if (!(xcvr->pll8k_clk || xcvr->pll11k_clk))
+			xcvr->pll8k_clk = xcvr->phy_clk;
+		fsl_asoc_constrain_rates(&xcvr->spdif_constr_rates,
+					 &fsl_xcvr_spdif_rates_constr,
+					 xcvr->pll8k_clk, xcvr->pll11k_clk, NULL,
+					 xcvr->spdif_constr_rates_list);
+	}
+
 	xcvr->ram_addr = devm_platform_ioremap_resource_byname(pdev, "ram");
 	if (IS_ERR(xcvr->ram_addr))
 		return PTR_ERR(xcvr->ram_addr);
-- 
2.46.2