On 27.02.2023 17:47, Vijendar Mukunda wrote:
> Add support for runtime pm ops for AMD SoundWire manager driver.
>
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
> Signed-off-by: Mastan Katragadda <Mastan.Katragadda@xxxxxxx>
> ---
> drivers/soundwire/amd_manager.c | 161 ++++++++++++++++++++++++++++++
> drivers/soundwire/amd_manager.h | 3 +
> include/linux/soundwire/sdw_amd.h | 17 ++++
> 3 files changed, 181 insertions(+)
>
> diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
> index 7bb2300f16b3..12345077c395 100644
> --- a/drivers/soundwire/amd_manager.c
> +++ b/drivers/soundwire/amd_manager.c
> @@ -14,6 +14,7 @@
> #include <linux/slab.h>
> #include <linux/soundwire/sdw.h>
> #include <linux/soundwire/sdw_registers.h>
> +#include <linux/pm_runtime.h>
> #include <linux/wait.h>
> #include <sound/pcm_params.h>
> #include <sound/soc.h>
> @@ -178,6 +179,12 @@ static void amd_disable_sdw_interrupts(struct amd_sdw_manager *amd_manager)
> acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_ERROR_INTR_MASK);
> }
>
> +static int amd_deinit_sdw_manager(struct amd_sdw_manager *amd_manager)
> +{
> + amd_disable_sdw_interrupts(amd_manager);
> + return amd_disable_sdw_manager(amd_manager);
> +}
> +
> static void amd_sdw_set_frameshape(struct amd_sdw_manager *amd_manager)
> {
> u32 frame_size;
> @@ -957,6 +964,12 @@ static void amd_sdw_probe_work(struct work_struct *work)
> return;
> amd_sdw_set_frameshape(amd_manager);
> }
> + /* Enable runtime PM */
> + pm_runtime_set_autosuspend_delay(amd_manager->dev, AMD_SDW_MASTER_SUSPEND_DELAY_MS);
> + pm_runtime_use_autosuspend(amd_manager->dev);
> + pm_runtime_mark_last_busy(amd_manager->dev);
> + pm_runtime_set_active(amd_manager->dev);
> + pm_runtime_enable(amd_manager->dev);
> }
>
> static int amd_sdw_manager_probe(struct platform_device *pdev)
> @@ -1040,17 +1053,165 @@ static int amd_sdw_manager_remove(struct platform_device *pdev)
> {
> struct amd_sdw_manager *amd_manager = dev_get_drvdata(&pdev->dev);
>
> + pm_runtime_disable(&pdev->dev);
> cancel_work_sync(&amd_manager->probe_work);
> amd_disable_sdw_interrupts(amd_manager);
> sdw_bus_master_delete(&amd_manager->bus);
> return amd_disable_sdw_manager(amd_manager);
> }
>
> +static int amd_sdw_clock_stop(struct amd_sdw_manager *amd_manager)
> +{
> + u32 val;
> + u32 retry_count = 0;
> + int ret;
> +
> + ret = sdw_bus_prep_clk_stop(&amd_manager->bus);
> + if (ret < 0 && ret != -ENODATA) {
> + dev_err(amd_manager->dev, "prepare clock stop failed %d", ret);
> + return 0;
> + }
> + ret = sdw_bus_clk_stop(&amd_manager->bus);
> + if (ret < 0 && ret != -ENODATA) {
> + dev_err(amd_manager->dev, "bus clock stop failed %d", ret);
> + return 0;
> + }
> +
> + do {
> + val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
> + if (val & AMD_SDW_CLK_STOP_DONE) {
> + amd_manager->clk_stopped = true;
> + break;
> + }
> + usleep_range(10, 20);
> + } while (retry_count++ < AMD_SDW_CLK_STOP_MAX_RETRY_COUNT);
Could these do { } while () be replaced by read_poll_timeout() ?
