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Date: Mon, 17 Aug 2020 23:29:19 +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, mengdong.lin@...el.com, bard.liao@...el.com Subject: [PATCH v2 08/12] soundwire: intel: add CLK_STOP_BUS_RESET support From: Rander Wang <rander.wang@...el.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@...el.com> 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 | 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
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