summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorShengjiu Wang <shengjiu.wang@nxp.com>2022-07-01 17:32:39 +0800
committerMark Brown <broonie@kernel.org>2022-07-05 13:00:40 +0100
commit7cb7f07d2491a3435578ab97eeeb70fadac6385c (patch)
tree42dfe879508041247ff0ef0d3fe34b27a3880f82
parent93f54100fbdedc22e8d88d037a8a3e32101724eb (diff)
downloadlinux-7cb7f07d2491a3435578ab97eeeb70fadac6385c.tar.bz2
ASoC: fsl_sai: Add support for PLL switch at runtime
i.MX8MQ/MN/MM/MP platforms typically have 2 AUDIO PLLs being configured to handle 8kHz and 11kHz series audio rates. The patch implements the functionality to select at runtime the appropriate AUDIO PLL as function of sysclk rate. Signed-off-by: Viorel Suman <viorel.suman@nxp.com> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Link: https://lore.kernel.org/r/1656667961-1799-5-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--sound/soc/fsl/Kconfig1
-rw-r--r--sound/soc/fsl/fsl_sai.c38
-rw-r--r--sound/soc/fsl/fsl_sai.h2
3 files changed, 41 insertions, 0 deletions
diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 533937166b4a..614eceda6b9e 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -19,6 +19,7 @@ config SND_SOC_FSL_SAI
select REGMAP_MMIO
select SND_SOC_IMX_PCM_DMA if SND_IMX_SOC != n
select SND_SOC_GENERIC_DMAENGINE_PCM
+ select SND_SOC_FSL_UTILS
help
Say Y if you want to add Synchronous Audio Interface (SAI)
support for the Freescale CPUs.
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index a0ddaf7e9f60..974ba0780b19 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -23,6 +23,7 @@
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include "fsl_sai.h"
+#include "fsl_utils.h"
#include "imx-pcm.h"
#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
@@ -220,14 +221,48 @@ static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
return 0;
}
+static int fsl_sai_set_mclk_rate(struct snd_soc_dai *dai, int clk_id, unsigned int freq)
+{
+ struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
+ int ret;
+
+ fsl_asoc_reparent_pll_clocks(dai->dev, sai->mclk_clk[clk_id],
+ sai->pll8k_clk, sai->pll11k_clk, freq);
+
+ ret = clk_set_rate(sai->mclk_clk[clk_id], freq);
+ if (ret < 0)
+ dev_err(dai->dev, "failed to set clock rate (%u): %d\n", freq, ret);
+
+ return ret;
+}
+
static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
+ struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
int ret;
if (dir == SND_SOC_CLOCK_IN)
return 0;
+ if (freq > 0 && clk_id != FSL_SAI_CLK_BUS) {
+ if (clk_id < 0 || clk_id >= FSL_SAI_MCLK_MAX) {
+ dev_err(cpu_dai->dev, "Unknown clock id: %d\n", clk_id);
+ return -EINVAL;
+ }
+
+ if (IS_ERR_OR_NULL(sai->mclk_clk[clk_id])) {
+ dev_err(cpu_dai->dev, "Unassigned clock: %d\n", clk_id);
+ return -EINVAL;
+ }
+
+ if (sai->mclk_streams == 0) {
+ ret = fsl_sai_set_mclk_rate(cpu_dai, clk_id, freq);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq, true);
if (ret) {
dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
@@ -1281,6 +1316,9 @@ static int fsl_sai_probe(struct platform_device *pdev)
else
sai->mclk_clk[0] = sai->bus_clk;
+ fsl_asoc_get_pll_clocks(&pdev->dev, &sai->pll8k_clk,
+ &sai->pll11k_clk);
+
/* read dataline mask for rx and tx*/
ret = fsl_sai_read_dlcfg(sai);
if (ret < 0) {
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 9bb8ced520c8..17956b5731dc 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -273,6 +273,8 @@ struct fsl_sai {
struct regmap *regmap;
struct clk *bus_clk;
struct clk *mclk_clk[FSL_SAI_MCLK_MAX];
+ struct clk *pll8k_clk;
+ struct clk *pll11k_clk;
struct resource *res;
bool is_consumer_mode;