From: Bard Liao <yung-chuan.liao@linux.intel.com>
To: alsa-devel@alsa-project.org, vkoul@kernel.org
Cc: vinod.koul@linaro.org, linux-kernel@vger.kernel.org,
tiwai@suse.de, broonie@kernel.org, gregkh@linuxfoundation.org,
jank@cadence.com, srinivas.kandagatla@linaro.org,
rander.wang@linux.intel.com, ranjani.sridharan@linux.intel.com,
hui.wang@canonical.com, pierre-louis.bossart@linux.intel.com,
sanyog.r.kale@intel.com, mengdong.lin@intel.com,
bard.liao@intel.com
Subject: [PATCH v2 08/12] soundwire: intel: add CLK_STOP_BUS_RESET support
Date: Mon, 17 Aug 2020 23:29:19 +0800 [thread overview]
Message-ID: <20200817152923.3259-9-yung-chuan.liao@linux.intel.com> (raw)
In-Reply-To: <20200817152923.3259-1-yung-chuan.liao@linux.intel.com>
From: Rander Wang <rander.wang@intel.com>
Move existing pm_runtime suspend under the CLK_STOP_TEARDOWN case.
In this mode the Master IP will lose all context but in-band wakes are
supported.
On pm_runtime resume a complete re-enumeration will be performed after
a bus reset.
Signed-off-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
---
drivers/soundwire/intel.c | 44 +++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 68c1cdfb7999..ad476e9e4d25 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1575,6 +1575,26 @@ static int intel_suspend_runtime(struct device *dev)
intel_shim_wake(sdw, false);
+ } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
+ ret = sdw_cdns_clock_stop(cdns, true);
+ if (ret < 0) {
+ dev_err(dev, "cannot enable clock stop on suspend\n");
+ return ret;
+ }
+
+ ret = sdw_cdns_enable_interrupt(cdns, false);
+ if (ret < 0) {
+ dev_err(dev, "cannot disable interrupts on suspend\n");
+ return ret;
+ }
+
+ ret = intel_link_power_down(sdw);
+ if (ret) {
+ dev_err(dev, "Link power down failed: %d", ret);
+ return ret;
+ }
+
+ intel_shim_wake(sdw, true);
} else {
dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
__func__, clock_stop_quirks);
@@ -1691,6 +1711,30 @@ static int intel_resume_runtime(struct device *dev)
dev_err(dev, "unable to exit bus reset sequence during resume\n");
return ret;
}
+ } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
+ ret = intel_init(sdw);
+ if (ret) {
+ dev_err(dev, "%s failed: %d", __func__, ret);
+ 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_enable_interrupt(cdns, true);
+ if (ret < 0) {
+ dev_err(dev, "cannot enable interrupts during resume\n");
+ return ret;
+ }
+
+ ret = sdw_cdns_clock_restart(cdns, true);
+ if (ret < 0) {
+ dev_err(dev, "unable to restart clock during resume\n");
+ return ret;
+ }
} else {
dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
__func__, clock_stop_quirks);
--
2.17.1
next prev parent reply other threads:[~2020-08-18 3:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 15:29 [PATCH v2 00/12] soundwire: intel: add power management support Bard Liao
2020-08-17 15:29 ` [PATCH v2 01/12] soundwire: intel: add pm_runtime support Bard Liao
2020-08-17 15:29 ` [PATCH v2 02/12] soundwire: intel: reset pm_runtime status during system resume Bard Liao
2020-08-17 15:29 ` [PATCH v2 03/12] soundwire: intel: fix race condition on " Bard Liao
2020-08-17 15:29 ` [PATCH v2 04/12] soundwire: intel: call helper to reset Slave states on resume Bard Liao
2020-08-17 15:29 ` [PATCH v2 05/12] soundwire: intel: reinitialize IP+DSP in .prepare(), but only when resuming Bard Liao
2020-08-17 15:29 ` [PATCH v2 06/12] soundwire: intel: pm_runtime idle scheduling Bard Liao
2020-08-17 15:29 ` [PATCH v2 07/12] soundwire: intel: add CLK_STOP_TEARDOWN for pm_runtime suspend Bard Liao
2020-08-17 15:29 ` Bard Liao [this message]
2020-08-17 15:29 ` [PATCH v2 09/12] soundwire: intel: add CLK_STOP_NOT_ALLOWED support Bard Liao
2020-08-17 15:29 ` [PATCH v2 10/12] soundwire: intel_init: handle power rail dependencies for clock stop mode Bard Liao
2020-08-17 15:29 ` [PATCH v2 11/12] soundwire: intel: support clock_stop mode without quirks Bard Liao
2020-08-17 15:29 ` [PATCH v2 12/12] soundwire: intel: refine runtime pm for SDW_INTEL_CLK_STOP_BUS_RESET Bard Liao
2020-08-18 6:31 ` [PATCH v2 00/12] soundwire: intel: add power management support Vinod Koul
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