On 22-07-20, 04:37, Bard Liao wrote:
> From: Rander Wang <[email protected]>
>
> 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 <[email protected]>
> Signed-off-by: Pierre-Louis Bossart <[email protected]>
> Signed-off-by: Bard Liao <[email protected]>
> ---
> drivers/soundwire/intel.c | 44 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
> index 1954eb48b86c..744fc0a4816a 100644
> --- a/drivers/soundwire/intel.c
> +++ b/drivers/soundwire/intel.c
> @@ -1576,6 +1576,26 @@ 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;
> + }
no cleanup on all the error cases here?
> +
> + intel_shim_wake(sdw, true);
> } else {
> dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
> __func__, clock_stop_quirks);
> @@ -1694,6 +1714,30 @@ 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
--
~Vinod
