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, gregkh@linuxfoundation.org, srinivas.kandagatla@linaro.org, rander.wang@linux.intel.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, bard.liao@intel.com Subject: [PATCH v2 0/3] soundwire: intel: exit clock-stop mode before system suspend Date: Wed, 18 Aug 2021 10:49:51 +0800 [thread overview] Message-ID: <20210818024954.16873-1-yung-chuan.liao@linux.intel.com> (raw) Intel validation reported an issue where the HW_RST self-clearing bit is not cleared in hardware, which as a ripple effect creates issues with the clock stop mode. This happens is a specific sequence where the Intel manager is pm_runtime suspended with the clock-stop mode enabled. During the system suspend, we currently do nothing, which can lead to potential issues on system resume and the following pm_runtime suspend, depending on the hardware state. This patch suggests a full resume if the clock-stop mode is used. This may require extra time but will make the suspend/resume flows completely symmetric. This also removes a race condition where we could not access SHIM registers if the parent was suspended as well. Resuming the link also resumes the parent by construction. BugLink: https://github.com/thesofproject/linux/issues/2606 v2: - Better comments and commit messages. - Modified the .prepare callback to only deal with the corner case that is NOT covered today instead of systematically doing a full resume. Pierre-Louis Bossart (3): soundwire: intel: fix potential race condition during power down soundwire: intel: skip suspend/resume/wake when link was not started soundwire: intel: conditionally exit clock stop mode on system suspend drivers/soundwire/intel.c | 150 ++++++++++++++++++++++++++++++-------- drivers/soundwire/intel.h | 1 + 2 files changed, 119 insertions(+), 32 deletions(-) -- 2.17.1
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From: Bard Liao <yung-chuan.liao@linux.intel.com> To: alsa-devel@alsa-project.org, vkoul@kernel.org Cc: vinod.koul@linaro.org, gregkh@linuxfoundation.org, pierre-louis.bossart@linux.intel.com, linux-kernel@vger.kernel.org, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com Subject: [PATCH v2 0/3] soundwire: intel: exit clock-stop mode before system suspend Date: Wed, 18 Aug 2021 10:49:51 +0800 [thread overview] Message-ID: <20210818024954.16873-1-yung-chuan.liao@linux.intel.com> (raw) Intel validation reported an issue where the HW_RST self-clearing bit is not cleared in hardware, which as a ripple effect creates issues with the clock stop mode. This happens is a specific sequence where the Intel manager is pm_runtime suspended with the clock-stop mode enabled. During the system suspend, we currently do nothing, which can lead to potential issues on system resume and the following pm_runtime suspend, depending on the hardware state. This patch suggests a full resume if the clock-stop mode is used. This may require extra time but will make the suspend/resume flows completely symmetric. This also removes a race condition where we could not access SHIM registers if the parent was suspended as well. Resuming the link also resumes the parent by construction. BugLink: https://github.com/thesofproject/linux/issues/2606 v2: - Better comments and commit messages. - Modified the .prepare callback to only deal with the corner case that is NOT covered today instead of systematically doing a full resume. Pierre-Louis Bossart (3): soundwire: intel: fix potential race condition during power down soundwire: intel: skip suspend/resume/wake when link was not started soundwire: intel: conditionally exit clock stop mode on system suspend drivers/soundwire/intel.c | 150 ++++++++++++++++++++++++++++++-------- drivers/soundwire/intel.h | 1 + 2 files changed, 119 insertions(+), 32 deletions(-) -- 2.17.1
next reply other threads:[~2021-08-18 2:50 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-18 2:49 Bard Liao [this message] 2021-08-18 2:49 ` [PATCH v2 0/3] soundwire: intel: exit clock-stop mode before system suspend Bard Liao 2021-08-18 2:49 ` [PATCH v2 1/3] soundwire: intel: fix potential race condition during power down Bard Liao 2021-08-18 2:49 ` Bard Liao 2021-08-18 2:49 ` [PATCH v2 2/3] soundwire: intel: skip suspend/resume/wake when link was not started Bard Liao 2021-08-18 2:49 ` Bard Liao 2021-08-18 2:49 ` [PATCH v2 3/3] soundwire: intel: conditionally exit clock stop mode on system suspend Bard Liao 2021-08-18 2:49 ` Bard Liao 2021-08-23 12:12 ` [PATCH v2 0/3] soundwire: intel: exit clock-stop mode before " Vinod Koul 2021-08-23 12:12 ` Vinod Koul
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