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Message-Id: <20200721203723.18305-9-yung-chuan.liao@linux.intel.com>
Date: Wed, 22 Jul 2020 04:37:18 +0800
From: Bard Liao <yung-chuan.liao@...ux.intel.com>
To: alsa-devel@...a-project.org, vkoul@...nel.org
Cc: vinod.koul@...aro.org, linux-kernel@...r.kernel.org, tiwai@...e.de,
broonie@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
srinivas.kandagatla@...aro.org, rander.wang@...ux.intel.com,
ranjani.sridharan@...ux.intel.com, hui.wang@...onical.com,
pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
slawomir.blauciak@...el.com, mengdong.lin@...el.com,
bard.liao@...el.com
Subject: [PATCH 08/13] soundwire: intel: add CLK_STOP_TEARDOWN for pm_runtime suspend
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Now that we have options, add support for TEARDOWN mode (same
functionality as existing code)
All other modes will be added in follow-up patches.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
drivers/soundwire/intel.c | 82 +++++++++++++++++++++-------------
drivers/soundwire/intel.h | 2 +
drivers/soundwire/intel_init.c | 1 +
3 files changed, 54 insertions(+), 31 deletions(-)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 4a60456f060d..1954eb48b86c 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1549,6 +1549,7 @@ static int intel_suspend_runtime(struct device *dev)
struct sdw_cdns *cdns = dev_get_drvdata(dev);
struct sdw_intel *sdw = cdns_to_intel(cdns);
struct sdw_bus *bus = &cdns->bus;
+ u32 clock_stop_quirks;
int ret;
if (bus->prop.hw_disabled) {
@@ -1557,21 +1558,31 @@ static int intel_suspend_runtime(struct device *dev)
return 0;
}
- ret = sdw_cdns_enable_interrupt(cdns, false);
- if (ret < 0) {
- dev_err(dev, "cannot disable interrupts on suspend\n");
- return ret;
- }
+ clock_stop_quirks = sdw->link_res->clock_stop_quirks;
- ret = intel_link_power_down(sdw);
- if (ret) {
- dev_err(dev, "Link power down failed: %d", ret);
- return ret;
- }
+ if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
+
+ ret = sdw_cdns_enable_interrupt(cdns, false);
+ if (ret < 0) {
+ dev_err(dev, "cannot disable interrupts on suspend\n");
+ return ret;
+ }
- intel_shim_wake(sdw, false);
+ ret = intel_link_power_down(sdw);
+ if (ret) {
+ dev_err(dev, "Link power down failed: %d", ret);
+ return ret;
+ }
+
+ intel_shim_wake(sdw, false);
+
+ } else {
+ dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
+ __func__, clock_stop_quirks);
+ ret = -EINVAL;
+ }
- return 0;
+ return ret;
}
static int intel_resume(struct device *dev)
@@ -1648,6 +1659,7 @@ static int intel_resume_runtime(struct device *dev)
struct sdw_cdns *cdns = dev_get_drvdata(dev);
struct sdw_intel *sdw = cdns_to_intel(cdns);
struct sdw_bus *bus = &cdns->bus;
+ u32 clock_stop_quirks;
int ret;
if (bus->prop.hw_disabled) {
@@ -1656,28 +1668,36 @@ static int intel_resume_runtime(struct device *dev)
return 0;
}
- ret = intel_init(sdw);
- if (ret) {
- dev_err(dev, "%s failed: %d", __func__, ret);
- return ret;
- }
+ clock_stop_quirks = sdw->link_res->clock_stop_quirks;
- /*
- * make sure all Slaves are tagged as UNATTACHED and provide
- * reason for reinitialization
- */
- sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
+ if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
+ ret = intel_init(sdw);
+ if (ret) {
+ dev_err(dev, "%s failed: %d", __func__, ret);
+ return ret;
+ }
- ret = sdw_cdns_enable_interrupt(cdns, true);
- if (ret < 0) {
- dev_err(dev, "cannot enable interrupts during resume\n");
- return ret;
- }
+ /*
+ * make sure all Slaves are tagged as UNATTACHED and provide
+ * reason for reinitialization
+ */
+ sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
- ret = sdw_cdns_exit_reset(cdns);
- if (ret < 0) {
- dev_err(dev, "unable to exit bus reset sequence during resume\n");
- return ret;
+ ret = sdw_cdns_enable_interrupt(cdns, true);
+ if (ret < 0) {
+ dev_err(dev, "cannot enable interrupts during resume\n");
+ return ret;
+ }
+
+ ret = sdw_cdns_exit_reset(cdns);
+ if (ret < 0) {
+ dev_err(dev, "unable to exit bus reset sequence during resume\n");
+ return ret;
+ }
+ } else {
+ dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
+ __func__, clock_stop_quirks);
+ ret = -EINVAL;
}
return ret;
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 4ea3d262d249..23daab9da329 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -17,6 +17,7 @@
* @dev: device implementing hw_params and free callbacks
* @shim_lock: mutex to handle access to shared SHIM registers
* @shim_mask: global pointer to check SHIM register initialization
+ * @clock_stop_quirks: mask defining requested behavior on pm_suspend
* @cdns: Cadence master descriptor
* @list: used to walk-through all masters exposed by the same controller
*/
@@ -31,6 +32,7 @@ struct sdw_intel_link_res {
struct device *dev;
struct mutex *shim_lock; /* protect shared registers */
u32 *shim_mask;
+ u32 clock_stop_quirks;
struct sdw_cdns *cdns;
struct list_head list;
};
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index 6dacfec55d50..96c9af15c308 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -248,6 +248,7 @@ static struct sdw_intel_ctx
link->ops = res->ops;
link->dev = res->dev;
+ link->clock_stop_quirks = res->clock_stop_quirks;
link->shim_lock = &ctx->shim_lock;
link->shim_mask = &ctx->shim_mask;
--
2.17.1
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