From b61b8b37888ab13d4bf1b8f406713d51f01568cf Mon Sep 17 00:00:00 2001 From: Pierre-Louis Bossart Date: Mon, 17 Aug 2020 23:29:13 +0800 Subject: [PATCH] soundwire: intel: reset pm_runtime status during system resume The system resume does the entire bus re-initialization and brings it to full-power. If the device was pm_runtime suspended, there is no need to run the pm_runtime resume sequence after the system runtime. Follow the documentation from runtime_pm.rst, and conditionally disable, set_active and re-enable the device on system resume. Note that pm_runtime_suspended() is used instead of pm_runtime_status_suspended() so that we can deal with the case where pm_runtime is disabled. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao Link: https://lore.kernel.org/r/20200817152923.3259-3-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul --- drivers/soundwire/intel.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 85a0bb6af4fe..0e21bae3cd19 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1434,6 +1434,12 @@ static int intel_suspend(struct device *dev) return 0; } + if (pm_runtime_suspended(dev)) { + dev_dbg(dev, "%s: pm_runtime status: suspended\n", __func__); + + return 0; + } + ret = sdw_cdns_enable_interrupt(cdns, false); if (ret < 0) { dev_err(dev, "cannot disable interrupts on suspend\n"); @@ -1494,6 +1500,16 @@ static int intel_resume(struct device *dev) return 0; } + if (pm_runtime_suspended(dev)) { + dev_dbg(dev, "%s: pm_runtime status was suspended, forcing active\n", __func__); + + /* follow required sequence from runtime_pm.rst */ + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_enable(dev); + } + ret = intel_init(sdw); if (ret) { dev_err(dev, "%s failed: %d", __func__, ret);