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Mon, 27 Feb 2023 09:44:21 -0600 From: Vijendar Mukunda To: Subject: [PATCH V4 6/8] soundwire: amd: add runtime pm ops for AMD SoundWire manager driver Date: Mon, 27 Feb 2023 21:17:59 +0530 Message-ID: <20230227154801.50319-7-Vijendar.Mukunda@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230227154801.50319-1-Vijendar.Mukunda@amd.com> References: <20230227154801.50319-1-Vijendar.Mukunda@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT044:EE_|SJ0PR12MB6760:EE_ X-MS-Office365-Filtering-Correlation-Id: 666b7522-7819-4d08-1879-08db18d98165 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; 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no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: alsa-devel@alsa-project.org, pierre-louis.bossart@linux.intel.com, Basavaraj.Hiregoudar@amd.com, Sunil-kumar.Dommati@amd.com, Mario.Limonciello@amd.com, amadeuszx.slawinski@linux.intel.com, Mastan.Katragadda@amd.com, Arungopal.kondaveeti@amd.com, Vijendar Mukunda , Bard Liao , Sanyog Kale , open list X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Add support for runtime pm ops for AMD SoundWire manager driver. Signed-off-by: Vijendar Mukunda Signed-off-by: Mastan Katragadda --- 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 #include #include +#include #include #include #include @@ -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); + + if (!amd_manager->clk_stopped) { + dev_err(amd_manager->dev, "SDW%x clock stop failed\n", amd_manager->instance); + return 0; + } + + if (amd_manager->wake_en_mask) + acp_reg_writel(0x01, amd_manager->acp_mmio + ACP_SW_WAKE_EN(amd_manager->instance)); + + dev_dbg(amd_manager->dev, "SDW%x clock stop successful\n", amd_manager->instance); + return 0; +} + +static int amd_sdw_clock_stop_exit(struct amd_sdw_manager *amd_manager) +{ + int ret; + u32 val; + u32 retry_count = 0; + + if (amd_manager->clk_stopped) { + val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + val |= AMD_SDW_CLK_RESUME_REQ; + acp_reg_writel(val, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + do { + val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + if (val & AMD_SDW_CLK_RESUME_DONE) + break; + usleep_range(10, 20); + } while (retry_count++ < AMD_SDW_CLK_STOP_MAX_RETRY_COUNT); + if (val & AMD_SDW_CLK_RESUME_DONE) { + acp_reg_writel(0, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + ret = sdw_bus_exit_clk_stop(&amd_manager->bus); + if (ret < 0) + dev_err(amd_manager->dev, "bus failed to exit clock stop %d\n", + ret); + amd_manager->clk_stopped = false; + } + } + if (amd_manager->clk_stopped) { + dev_err(amd_manager->dev, "SDW%x clock stop exit failed\n", amd_manager->instance); + return 0; + } + dev_dbg(amd_manager->dev, "SDW%x clock stop exit successful\n", amd_manager->instance); + return 0; +} + +static int __maybe_unused amd_suspend_runtime(struct device *dev) +{ + struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev); + struct sdw_bus *bus = &amd_manager->bus; + int ret; + + if (bus->prop.hw_disabled) { + dev_dbg(bus->dev, "SoundWire manager %d is disabled,\n", + bus->link_id); + return 0; + } + if (amd_manager->power_mode_mask & AMD_SDW_CLK_STOP_MODE) { + ret = amd_sdw_clock_stop(amd_manager); + if (ret) + return ret; + } else if (amd_manager->power_mode_mask & AMD_SDW_POWER_OFF_MODE) { + ret = amd_sdw_clock_stop(amd_manager); + if (ret) + return ret; + ret = amd_deinit_sdw_manager(amd_manager); + if (ret) + return ret; + } + return 0; +} + +static int __maybe_unused amd_resume_runtime(struct device *dev) +{ + struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev); + struct sdw_bus *bus = &amd_manager->bus; + int ret; + u32 val; + u32 retry_count = 0; + + if (bus->prop.hw_disabled) { + dev_dbg(bus->dev, "SoundWire manager %d is disabled, ignoring\n", + bus->link_id); + return 0; + } + + if (amd_manager->power_mode_mask & AMD_SDW_CLK_STOP_MODE) { + ret = amd_sdw_clock_stop_exit(amd_manager); + if (ret) + return ret; + } else if (amd_manager->power_mode_mask & AMD_SDW_POWER_OFF_MODE) { + val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + if (val) { + val |= AMD_SDW_CLK_RESUME_REQ; + acp_reg_writel(val, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + do { + val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + if (val & AMD_SDW_CLK_RESUME_DONE) + break; + usleep_range(10, 20); + } while (retry_count++ < AMD_SDW_CLK_STOP_MAX_RETRY_COUNT); + if (val & AMD_SDW_CLK_RESUME_DONE) { + acp_reg_writel(0, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL); + amd_manager->clk_stopped = false; + } + } + sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); + amd_init_sdw_manager(amd_manager); + amd_enable_sdw_interrupts(amd_manager); + ret = amd_enable_sdw_manager(amd_manager); + if (ret) + return ret; + amd_sdw_set_frameshape(amd_manager); + } + return 0; +} + +static const struct dev_pm_ops amd_pm = { + SET_RUNTIME_PM_OPS(amd_suspend_runtime, amd_resume_runtime, NULL) +}; + static struct platform_driver amd_sdw_driver = { .probe = &amd_sdw_manager_probe, .remove = &amd_sdw_manager_remove, .driver = { .name = "amd_sdw_manager", + .pm = &amd_pm, } }; module_platform_driver(amd_sdw_driver); diff --git a/drivers/soundwire/amd_manager.h b/drivers/soundwire/amd_manager.h index 3920648fdc52..93022a325598 100644 --- a/drivers/soundwire/amd_manager.h +++ b/drivers/soundwire/amd_manager.h @@ -187,6 +187,9 @@ #define AMD_SDW0_PAD_KEEPER_DISABLE_MASK 0x1E #define AMD_SDW1_PAD_KEEPER_DISABLE_MASK 0xF #define AMD_SDW_PREQ_INTR_STAT BIT(19) +#define AMD_SDW_CLK_STOP_DONE 1 +#define AMD_SDW_CLK_RESUME_REQ 2 +#define AMD_SDW_CLK_RESUME_DONE 3 enum amd_sdw_cmd_type { AMD_SDW_CMD_PING = 0, diff --git a/include/linux/soundwire/sdw_amd.h b/include/linux/soundwire/sdw_amd.h index df60bc0de6fc..ceecad74aef9 100644 --- a/include/linux/soundwire/sdw_amd.h +++ b/include/linux/soundwire/sdw_amd.h @@ -8,6 +8,21 @@ #include +/* AMD pm_runtime quirk definitions */ + +/* + * Force the clock to stop(ClockStopMode0) when suspend callback + * is invoked. + */ +#define AMD_SDW_CLK_STOP_MODE 1 + +/* + * Stop the bus when runtime suspend/system level suspend callback + * is invoked. If set, a complete bus reset and re-enumeration will + * be performed when the bus restarts. In-band wake interrupts are + * not supported in this mode. + */ +#define AMD_SDW_POWER_OFF_MODE 2 #define ACP_SDW0 0 #define ACP_SDW1 1 @@ -57,6 +72,7 @@ struct sdw_amd_dai_runtime { * @instance: SoundWire manager instance * @quirks: SoundWire manager quirks * @wake_en_mask: wake enable mask per SoundWire manager + * @clk_stopped: flag set to true when clock is stopped * @power_mode_mask: flag interprets amd SoundWire manager power mode * @dai_runtime_array: dai runtime array */ @@ -86,6 +102,7 @@ struct amd_sdw_manager { u32 quirks; u32 wake_en_mask; u32 power_mode_mask; + bool clk_stopped; struct sdw_amd_dai_runtime **dai_runtime_array; };