leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

soundwire: qcom: add runtime pm support

Browse Source 
Add support to runtime PM using SoundWire clock stop Mode0 on supported
controller instances and soft reset on instances that do not support
clock stop.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220228172528.3489-2-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Srinivas Kandagatla 2022-02-28 17:25:26 +00:00 committed by Vinod Koul
parent 63fadaa2c7
commit 74e79da9fd
1 changed files with 155 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

156
drivers/soundwire/qcom.c
View File

@ -11,6 +11,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/slimbus.h>
@ -20,6 +21,9 @@
#include <sound/soc.h>
#include "bus.h"
#define SWRM_COMP_SW_RESET 0x008
#define SWRM_COMP_STATUS 0x014
#define SWRM_FRM_GEN_ENABLED BIT(0)
#define SWRM_COMP_HW_VERSION 0x00
#define SWRM_COMP_CFG_ADDR 0x04
#define SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK BIT(1)
@ -29,6 +33,7 @@
#define SWRM_COMP_PARAMS_RD_FIFO_DEPTH GENMASK(19, 15)
#define SWRM_COMP_PARAMS_DOUT_PORTS_MASK GENMASK(4, 0)
#define SWRM_COMP_PARAMS_DIN_PORTS_MASK GENMASK(9, 5)
#define SWRM_COMP_MASTER_ID 0x104
#define SWRM_INTERRUPT_STATUS 0x200
#define SWRM_INTERRUPT_STATUS_RMSK GENMASK(16, 0)
#define SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ BIT(0)
@ -111,6 +116,13 @@
#define SWR_MAX_CMD_ID 14
#define MAX_FIFO_RD_RETRY 3
#define SWR_OVERFLOW_RETRY_COUNT 30
#define SWRM_LINK_STATUS_RETRY_CNT 100
enum {
MASTER_ID_WSA = 1,
MASTER_ID_RX,
MASTER_ID_TX
};
struct qcom_swrm_port_config {
u8 si;
@ -159,6 +171,7 @@ struct qcom_swrm_ctrl {
u32 slave_status;
u32 wr_fifo_depth;
u32 rd_fifo_depth;
bool clock_stop_not_supported;
};
struct qcom_swrm_data {
@ -497,6 +510,7 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
u32 i;
int devnum;
int ret = IRQ_HANDLED;
clk_prepare_enable(swrm->hclk);
swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts);
intr_sts_masked = intr_sts & swrm->intr_mask;
@ -604,6 +618,7 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
intr_sts_masked = intr_sts & swrm->intr_mask;
} while (intr_sts_masked);
clk_disable_unprepare(swrm->hclk);
return ret;
}
@ -1017,6 +1032,15 @@ static int qcom_swrm_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *codec_dai;
int ret, i;
ret = pm_runtime_get_sync(ctrl->dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(ctrl->dev,
"pm_runtime_get_sync failed in %s, ret %d\n",
__func__, ret);
pm_runtime_put_noidle(ctrl->dev);
return ret;
}
sruntime = sdw_alloc_stream(dai->name);
if (!sruntime)
return -ENOMEM;
@ -1044,6 +1068,9 @@ static void qcom_swrm_shutdown(struct snd_pcm_substream *substream,
sdw_release_stream(ctrl->sruntime[dai->id]);
ctrl->sruntime[dai->id] = NULL;
pm_runtime_mark_last_busy(ctrl->dev);
pm_runtime_put_autosuspend(ctrl->dev);
}
static const struct snd_soc_dai_ops qcom_swrm_pdm_dai_ops = {
@ -1197,12 +1224,23 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
static int swrm_reg_show(struct seq_file *s_file, void *data)
{
struct qcom_swrm_ctrl *swrm = s_file->private;
int reg, reg_val;
int reg, reg_val, ret;
ret = pm_runtime_get_sync(swrm->dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(swrm->dev,
"pm_runtime_get_sync failed in %s, ret %d\n",
__func__, ret);
pm_runtime_put_noidle(swrm->dev);
}
for (reg = 0; reg <= SWR_MSTR_MAX_REG_ADDR; reg += 4) {
swrm->reg_read(swrm, reg, &reg_val);
seq_printf(s_file, "0x%.3x: 0x%.2x\n", reg, reg_val);
}
pm_runtime_mark_last_busy(swrm->dev);
pm_runtime_put_autosuspend(swrm->dev);
return 0;
}
@ -1267,6 +1305,7 @@ static int qcom_swrm_probe(struct platform_device *pdev)
ctrl->bus.ops = &qcom_swrm_ops;
ctrl->bus.port_ops = &qcom_swrm_port_ops;
ctrl->bus.compute_params = &qcom_swrm_compute_params;
ctrl->bus.clk_stop_timeout = 300;
ret = qcom_swrm_get_port_config(ctrl);
if (ret)
@ -1319,6 +1358,21 @@ static int qcom_swrm_probe(struct platform_device *pdev)
(ctrl->version >> 24) & 0xff, (ctrl->version >> 16) & 0xff,
ctrl->version & 0xffff);
pm_runtime_set_autosuspend_delay(dev, 3000);
pm_runtime_use_autosuspend(dev);
pm_runtime_mark_last_busy(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
/* Clk stop is not supported on WSA Soundwire masters */
if (ctrl->version <= 0x01030000) {
ctrl->clock_stop_not_supported = true;
} else {
ctrl->reg_read(ctrl, SWRM_COMP_MASTER_ID, &val);
if (val == MASTER_ID_WSA)
ctrl->clock_stop_not_supported = true;
}
#ifdef CONFIG_DEBUG_FS
ctrl->debugfs = debugfs_create_dir("qualcomm-sdw", ctrl->bus.debugfs);
debugfs_create_file("qualcomm-registers", 0400, ctrl->debugfs, ctrl,
@ -1345,6 +1399,105 @@ static int qcom_swrm_remove(struct platform_device *pdev)
return 0;
}
static bool swrm_wait_for_frame_gen_enabled(struct qcom_swrm_ctrl *swrm)
{
int retry = SWRM_LINK_STATUS_RETRY_CNT;
int comp_sts;
do {
swrm->reg_read(swrm, SWRM_COMP_STATUS, &comp_sts);
if (comp_sts & SWRM_FRM_GEN_ENABLED)
return true;
usleep_range(500, 510);
} while (retry--);
dev_err(swrm->dev, "%s: link status not %s\n", __func__,
comp_sts && SWRM_FRM_GEN_ENABLED ? "connected" : "disconnected");
return false;
}
static int swrm_runtime_resume(struct device *dev)
{
struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dev);
int ret;
clk_prepare_enable(ctrl->hclk);
if (ctrl->clock_stop_not_supported) {
reinit_completion(&ctrl->enumeration);
ctrl->reg_write(ctrl, SWRM_COMP_SW_RESET, 0x01);
usleep_range(100, 105);
qcom_swrm_init(ctrl);
usleep_range(100, 105);
if (!swrm_wait_for_frame_gen_enabled(ctrl))
dev_err(ctrl->dev, "link failed to connect\n");
/* wait for hw enumeration to complete */
wait_for_completion_timeout(&ctrl->enumeration,
msecs_to_jiffies(TIMEOUT_MS));
qcom_swrm_get_device_status(ctrl);
sdw_handle_slave_status(&ctrl->bus, ctrl->status);
} else {
ctrl->reg_write(ctrl, SWRM_MCP_BUS_CTRL, SWRM_MCP_BUS_CLK_START);
ctrl->reg_write(ctrl, SWRM_INTERRUPT_CLEAR,
SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET);
ctrl->intr_mask |= SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET;
ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR, ctrl->intr_mask);
ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN, ctrl->intr_mask);
usleep_range(100, 105);
if (!swrm_wait_for_frame_gen_enabled(ctrl))
dev_err(ctrl->dev, "link failed to connect\n");
ret = sdw_bus_exit_clk_stop(&ctrl->bus);
if (ret < 0)
dev_err(ctrl->dev, "bus failed to exit clock stop %d\n", ret);
}
return 0;
}
static int __maybe_unused swrm_runtime_suspend(struct device *dev)
{
struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dev);
int ret;
if (!ctrl->clock_stop_not_supported) {
/* Mask bus clash interrupt */
ctrl->intr_mask &= ~SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET;
ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR, ctrl->intr_mask);
ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN, ctrl->intr_mask);
/* Prepare slaves for clock stop */
ret = sdw_bus_prep_clk_stop(&ctrl->bus);
if (ret < 0 && ret != -ENODATA) {
dev_err(dev, "prepare clock stop failed %d", ret);
return ret;
}
ret = sdw_bus_clk_stop(&ctrl->bus);
if (ret < 0 && ret != -ENODATA) {
dev_err(dev, "bus clock stop failed %d", ret);
return ret;
}
}
clk_disable_unprepare(ctrl->hclk);
usleep_range(300, 305);
return 0;
}
static const struct dev_pm_ops swrm_dev_pm_ops = {
SET_RUNTIME_PM_OPS(swrm_runtime_suspend, swrm_runtime_resume, NULL)
};
static const struct of_device_id qcom_swrm_of_match[] = {
{ .compatible = "qcom,soundwire-v1.3.0", .data = &swrm_v1_3_data },
{ .compatible = "qcom,soundwire-v1.5.1", .data = &swrm_v1_5_data },
@ -1359,6 +1512,7 @@ static struct platform_driver qcom_swrm_driver = {
.driver = {
.name = "qcom-soundwire",
.of_match_table = qcom_swrm_of_match,
.pm = &swrm_dev_pm_ops,
}
};
module_platform_driver(qcom_swrm_driver);