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Date: Mon, 17 Aug 2020 23:29:22 +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 11/12] soundwire: intel: support clock_stop mode without quirks From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com> In this mode, on restart the bus restarts immediately, the Slaves remain synchronized and all context is kept intact. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com> Signed-off-by: Rander Wang <rander.wang@...el.com> Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com> --- drivers/soundwire/intel.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 95b14c034ea7..2899445e2649 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1595,7 +1595,8 @@ static int intel_suspend_runtime(struct device *dev) intel_shim_wake(sdw, false); - } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) { + } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || + !clock_stop_quirks) { ret = sdw_cdns_clock_stop(cdns, true); if (ret < 0) { dev_err(dev, "cannot enable clock stop on suspend\n"); @@ -1755,6 +1756,24 @@ static int intel_resume_runtime(struct device *dev) dev_err(dev, "unable to restart clock during resume\n"); return ret; } + } else if (!clock_stop_quirks) { + 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; + } + + ret = sdw_cdns_clock_restart(cdns, false); + if (ret < 0) { + dev_err(dev, "unable to resume master 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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