Unverified Commit 907e0cde authored by Shengjiu Wang's avatar Shengjiu Wang Committed by Mark Brown
Browse files

ASoC: fsl_sai: Add pm qos cpu latency support 



On SoCs such as i.MX7ULP, cpuidle has some levels which
may disable system/bus clocks, so need to add pm_qos to
prevent cpuidle from entering low level idles and make sure
system/bus clocks are enabled when sai is active.

Signed-off-by: default avatarShengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1613983220-5373-1-git-send-email-shengjiu.wang@nxp.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 13fba3e8

sound/soc/fsl/fsl_sai.c

+12 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/module.h>

#include <linux/of_address.h>

#include <linux/of_device.h>

#include <linux/pm_qos.h>

#include <linux/pm_runtime.h>

#include <linux/regmap.h>

#include <linux/slab.h>
@@ -1177,6 +1178,7 @@ static const struct fsl_sai_soc_data fsl_sai_vf610_data = { 
	.fifo_depth = 32,

	.reg_offset = 0,

	.mclk0_is_mclk1 = false,

	.flags = 0,

};



static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
@@ -1185,6 +1187,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = { 
	.fifo_depth = 32,

	.reg_offset = 0,

	.mclk0_is_mclk1 = true,

	.flags = 0,

};



static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = {
@@ -1193,6 +1196,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = { 
	.fifo_depth = 16,

	.reg_offset = 8,

	.mclk0_is_mclk1 = false,

	.flags = PMQOS_CPU_LATENCY,

};



static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = {
@@ -1201,6 +1205,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = { 
	.fifo_depth = 128,

	.reg_offset = 8,

	.mclk0_is_mclk1 = false,

	.flags = 0,

};



static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = {
@@ -1209,6 +1214,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = { 
	.fifo_depth = 64,

	.reg_offset = 0,

	.mclk0_is_mclk1 = false,

	.flags = 0,

};



static const struct of_device_id fsl_sai_ids[] = {
@@ -1235,6 +1241,9 @@ static int fsl_sai_runtime_suspend(struct device *dev) 


	clk_disable_unprepare(sai->bus_clk);



	if (sai->soc_data->flags & PMQOS_CPU_LATENCY)

		cpu_latency_qos_remove_request(&sai->pm_qos_req);



	regcache_cache_only(sai->regmap, true);



	return 0;
@@ -1264,6 +1273,9 @@ static int fsl_sai_runtime_resume(struct device *dev) 
			goto disable_tx_clk;

	}



	if (sai->soc_data->flags & PMQOS_CPU_LATENCY)

		cpu_latency_qos_add_request(&sai->pm_qos_req, 0);



	regcache_cache_only(sai->regmap, false);

	regcache_mark_dirty(sai->regmap);

	regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), FSL_SAI_CSR_SR);

sound/soc/fsl/fsl_sai.h

+4 −0
Original line number Diff line number Diff line
@@ -216,12 +216,15 @@ 
#define FSL_SAI_MAXBURST_TX 6

#define FSL_SAI_MAXBURST_RX 6



#define PMQOS_CPU_LATENCY   BIT(0)



struct fsl_sai_soc_data {

	bool use_imx_pcm;

	bool use_edma;

	bool mclk0_is_mclk1;

	unsigned int fifo_depth;

	unsigned int reg_offset;

	unsigned int flags;

};



/**
@@ -273,6 +276,7 @@ struct fsl_sai { 
	struct snd_dmaengine_dai_dma_data dma_params_tx;

	struct fsl_sai_verid verid;

	struct fsl_sai_param param;

	struct pm_qos_request pm_qos_req;

};



#define TX 1