From: Jon Hunter <jonathanh@nvidia.com> To: "Stephen Warren" <swarren@wwwdotorg.org>, "Thierry Reding" <thierry.reding@gmail.com>, "Alexandre Courbot" <gnurou@gmail.com>, "Philipp Zabel" <p.zabel@pengutronix.de>, "Peter De Schrijver" <pdeschrijver@nvidia.com>, "Prashant Gaikwad" <pgaikwad@nvidia.com>, "Terje Bergström" <tbergstrom@nvidia.com>, "Hans de Goede" <hdegoede@redhat.com>, "Tejun Heo" <tj@kernel.org> Cc: Vince Hsu <vinceh@nvidia.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, Jon Hunter <jonathanh@nvidia.com> Subject: [PATCH V3 12/19] ata: ahci_tegra: Add support for generic PM domains Date: Mon, 13 Jul 2015 13:39:50 +0100 [thread overview] Message-ID: <1436791197-32358-13-git-send-email-jonathanh@nvidia.com> (raw) In-Reply-To: <1436791197-32358-1-git-send-email-jonathanh@nvidia.com> Add support to the tegra AHCI driver for generic PM domains. However, to ensure backward compatibility with older device tree blobs ensure that the driver can work with or without generic PM domains. In order to migrate to generic PM domain infrastructure the necessary changes are: 1. If the "power-domains" property is present in the DT device node then generic PM domains is supported and the variable has_genpd should be set. The ahci_platform_get_resources()/put_resources() calls the appropriate pm_runtime functions and so no further changes are needed for rpm support. 2. To ensure that clocks are managed consistently when generic PM domains are used and are not used, drivers should be migrated to use the tegra_powergate_power_on_legacy() and tegra_powergate_power_off_legacy() functions instead of the current tegra_powergate_sequence_power_up() and tegra_powergate_power_off(). The purpose of the tegra_powergate_power_on_legacy() and tegra_powergate_power_off_legacy() APIs is to mimick the behaviour of the tegra generic power-domain code, such that if generic power domains are not supported the functionality is the same. 3. The main difference between the tegra_powergate_sequence_power_up() API and the tegra_powergate_power_on_legacy() is that the clock used to enable the powergate is not kept enabled when using the tegra_powergate_power_on_legacy() API. Therefore, drivers must enable the clocks they need after calling tegra_powergate_power_on_legacy() and disable these clocks before calling tegra_powergate_power_off_legacy(). The helper functions for handling the powering on and off of the AHCI controller have been updated to support generic PM domains and the following changes have been made: a). The clocks for the AHCI controller are managed by the ahci_platform_enable_resources() and ahci_platform_disable_resources() and so the calls to clock_disable_unprepare() are not needed and can be removed. b). The tegra->sata_rst is handled by the tegra powergate code and so does not need to be controlled by the driver. c). AHCI controller resets should be applied before the clocks are disabled and so the call to ahci_platform_disable_resources() has been moved to after the reset assertion. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> --- drivers/ata/ahci_tegra.c | 51 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 36 insertions(+), 15 deletions(-) diff --git a/drivers/ata/ahci_tegra.c b/drivers/ata/ahci_tegra.c index 3a62eb246d80..438849c15e0e 100644 --- a/drivers/ata/ahci_tegra.c +++ b/drivers/ata/ahci_tegra.c @@ -23,6 +23,7 @@ #include <linux/module.h> #include <linux/of_device.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> @@ -108,6 +109,7 @@ struct tegra_ahci_priv { /* Needs special handling, cannot use ahci_platform */ struct clk *sata_clk; struct regulator_bulk_data supplies[5]; + bool has_genpd; }; static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) @@ -120,11 +122,13 @@ static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) if (ret) return ret; - ret = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_SATA, - tegra->sata_clk, - tegra->sata_rst); - if (ret) - goto disable_regulators; + if (!tegra->has_genpd) { + ret = tegra_powergate_power_on_legacy(TEGRA_POWERGATE_SATA, + tegra->sata_clk, + tegra->sata_rst); + if (ret) + goto disable_regulators; + } reset_control_assert(tegra->sata_oob_rst); reset_control_assert(tegra->sata_cold_rst); @@ -139,9 +143,8 @@ static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) return 0; disable_power: - clk_disable_unprepare(tegra->sata_clk); - - tegra_powergate_power_off(TEGRA_POWERGATE_SATA); + tegra_powergate_power_off_legacy(TEGRA_POWERGATE_SATA, tegra->sata_clk, + tegra->sata_rst); disable_regulators: regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies); @@ -149,20 +152,27 @@ disable_regulators: return ret; } -static void tegra_ahci_power_off(struct ahci_host_priv *hpriv) +static int tegra_ahci_power_off(struct ahci_host_priv *hpriv) { struct tegra_ahci_priv *tegra = hpriv->plat_data; + int ret; - ahci_platform_disable_resources(hpriv); - - reset_control_assert(tegra->sata_rst); reset_control_assert(tegra->sata_oob_rst); reset_control_assert(tegra->sata_cold_rst); - clk_disable_unprepare(tegra->sata_clk); - tegra_powergate_power_off(TEGRA_POWERGATE_SATA); + ahci_platform_disable_resources(hpriv); + + if (!tegra->has_genpd) { + ret = tegra_powergate_power_off_legacy(TEGRA_POWERGATE_SATA, + tegra->sata_clk, + tegra->sata_rst); + if (ret) + return ret; + } regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies); + + return 0; } static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv) @@ -263,7 +273,15 @@ static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv) static void tegra_ahci_controller_deinit(struct ahci_host_priv *hpriv) { - tegra_ahci_power_off(hpriv); + struct tegra_ahci_priv *tegra = hpriv->plat_data; + int ret; + + ret = tegra_ahci_power_off(hpriv); + + if (ret) + dev_err(&tegra->pdev->dev, + "failed to power off AHCI controller: %d\n", ret); + } static void tegra_ahci_host_stop(struct ata_host *host) @@ -356,6 +374,9 @@ static int tegra_ahci_probe(struct platform_device *pdev) return ret; } + if (of_property_read_bool(pdev->dev.of_node, "power-domains")) + tegra->has_genpd = true; + ret = tegra_ahci_controller_init(hpriv); if (ret) return ret; -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: jonathanh@nvidia.com (Jon Hunter) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH V3 12/19] ata: ahci_tegra: Add support for generic PM domains Date: Mon, 13 Jul 2015 13:39:50 +0100 [thread overview] Message-ID: <1436791197-32358-13-git-send-email-jonathanh@nvidia.com> (raw) In-Reply-To: <1436791197-32358-1-git-send-email-jonathanh@nvidia.com> Add support to the tegra AHCI driver for generic PM domains. However, to ensure backward compatibility with older device tree blobs ensure that the driver can work with or without generic PM domains. In order to migrate to generic PM domain infrastructure the necessary changes are: 1. If the "power-domains" property is present in the DT device node then generic PM domains is supported and the variable has_genpd should be set. The ahci_platform_get_resources()/put_resources() calls the appropriate pm_runtime functions and so no further changes are needed for rpm support. 2. To ensure that clocks are managed consistently when generic PM domains are used and are not used, drivers should be migrated to use the tegra_powergate_power_on_legacy() and tegra_powergate_power_off_legacy() functions instead of the current tegra_powergate_sequence_power_up() and tegra_powergate_power_off(). The purpose of the tegra_powergate_power_on_legacy() and tegra_powergate_power_off_legacy() APIs is to mimick the behaviour of the tegra generic power-domain code, such that if generic power domains are not supported the functionality is the same. 3. The main difference between the tegra_powergate_sequence_power_up() API and the tegra_powergate_power_on_legacy() is that the clock used to enable the powergate is not kept enabled when using the tegra_powergate_power_on_legacy() API. Therefore, drivers must enable the clocks they need after calling tegra_powergate_power_on_legacy() and disable these clocks before calling tegra_powergate_power_off_legacy(). The helper functions for handling the powering on and off of the AHCI controller have been updated to support generic PM domains and the following changes have been made: a). The clocks for the AHCI controller are managed by the ahci_platform_enable_resources() and ahci_platform_disable_resources() and so the calls to clock_disable_unprepare() are not needed and can be removed. b). The tegra->sata_rst is handled by the tegra powergate code and so does not need to be controlled by the driver. c). AHCI controller resets should be applied before the clocks are disabled and so the call to ahci_platform_disable_resources() has been moved to after the reset assertion. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> --- drivers/ata/ahci_tegra.c | 51 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 36 insertions(+), 15 deletions(-) diff --git a/drivers/ata/ahci_tegra.c b/drivers/ata/ahci_tegra.c index 3a62eb246d80..438849c15e0e 100644 --- a/drivers/ata/ahci_tegra.c +++ b/drivers/ata/ahci_tegra.c @@ -23,6 +23,7 @@ #include <linux/module.h> #include <linux/of_device.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> @@ -108,6 +109,7 @@ struct tegra_ahci_priv { /* Needs special handling, cannot use ahci_platform */ struct clk *sata_clk; struct regulator_bulk_data supplies[5]; + bool has_genpd; }; static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) @@ -120,11 +122,13 @@ static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) if (ret) return ret; - ret = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_SATA, - tegra->sata_clk, - tegra->sata_rst); - if (ret) - goto disable_regulators; + if (!tegra->has_genpd) { + ret = tegra_powergate_power_on_legacy(TEGRA_POWERGATE_SATA, + tegra->sata_clk, + tegra->sata_rst); + if (ret) + goto disable_regulators; + } reset_control_assert(tegra->sata_oob_rst); reset_control_assert(tegra->sata_cold_rst); @@ -139,9 +143,8 @@ static int tegra_ahci_power_on(struct ahci_host_priv *hpriv) return 0; disable_power: - clk_disable_unprepare(tegra->sata_clk); - - tegra_powergate_power_off(TEGRA_POWERGATE_SATA); + tegra_powergate_power_off_legacy(TEGRA_POWERGATE_SATA, tegra->sata_clk, + tegra->sata_rst); disable_regulators: regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies); @@ -149,20 +152,27 @@ disable_regulators: return ret; } -static void tegra_ahci_power_off(struct ahci_host_priv *hpriv) +static int tegra_ahci_power_off(struct ahci_host_priv *hpriv) { struct tegra_ahci_priv *tegra = hpriv->plat_data; + int ret; - ahci_platform_disable_resources(hpriv); - - reset_control_assert(tegra->sata_rst); reset_control_assert(tegra->sata_oob_rst); reset_control_assert(tegra->sata_cold_rst); - clk_disable_unprepare(tegra->sata_clk); - tegra_powergate_power_off(TEGRA_POWERGATE_SATA); + ahci_platform_disable_resources(hpriv); + + if (!tegra->has_genpd) { + ret = tegra_powergate_power_off_legacy(TEGRA_POWERGATE_SATA, + tegra->sata_clk, + tegra->sata_rst); + if (ret) + return ret; + } regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies); + + return 0; } static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv) @@ -263,7 +273,15 @@ static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv) static void tegra_ahci_controller_deinit(struct ahci_host_priv *hpriv) { - tegra_ahci_power_off(hpriv); + struct tegra_ahci_priv *tegra = hpriv->plat_data; + int ret; + + ret = tegra_ahci_power_off(hpriv); + + if (ret) + dev_err(&tegra->pdev->dev, + "failed to power off AHCI controller: %d\n", ret); + } static void tegra_ahci_host_stop(struct ata_host *host) @@ -356,6 +374,9 @@ static int tegra_ahci_probe(struct platform_device *pdev) return ret; } + if (of_property_read_bool(pdev->dev.of_node, "power-domains")) + tegra->has_genpd = true; + ret = tegra_ahci_controller_init(hpriv); if (ret) return ret; -- 2.1.4
next prev parent reply other threads:[~2015-07-13 12:39 UTC|newest] Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-13 12:39 [PATCH V3 00/19] Add generic PM domain support for Tegra SoCs Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 06/19] clk: tegra: remove TEGRA_PLL_USE_LOCK for PLLD/PLLD2 Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-7-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-13 13:41 ` Peter De Schrijver 2015-07-13 13:41 ` Peter De Schrijver 2015-07-13 14:02 ` Jon Hunter 2015-07-13 14:02 ` Jon Hunter [not found] ` <55A3C50E.7060706-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-14 11:59 ` Jon Hunter 2015-07-14 11:59 ` Jon Hunter 2015-07-14 11:59 ` Jon Hunter [not found] ` <55A4F985.7010503-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-15 8:16 ` Peter De Schrijver 2015-07-15 8:16 ` Peter De Schrijver [not found] ` <1436791197-32358-1-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-13 12:39 ` [PATCH V3 01/19] reset: add of_reset_control_get_by_index() Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-2-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 12:08 ` Philipp Zabel 2015-07-17 12:08 ` Philipp Zabel 2015-07-13 12:39 ` [PATCH V3 02/19] memory: tegra: Add MC flush support Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-17 9:57 ` Thierry Reding 2015-07-17 9:57 ` Thierry Reding 2015-07-17 10:20 ` Peter De Schrijver 2015-07-17 10:20 ` Peter De Schrijver [not found] ` <20150717102049.GQ6287-Rysk9IDjsxmJz7etNGeUX8VPkgjIgRvpAL8bYrjMMd8@public.gmane.org> 2015-07-17 11:31 ` Thierry Reding 2015-07-17 11:31 ` Thierry Reding 2015-07-20 8:46 ` Jon Hunter 2015-07-20 8:46 ` Jon Hunter 2015-07-20 9:17 ` Thierry Reding 2015-07-20 9:17 ` Thierry Reding 2015-07-20 9:59 ` Peter De Schrijver 2015-07-20 9:59 ` Peter De Schrijver [not found] ` <20150720095941.GZ6287-Rysk9IDjsxmJz7etNGeUX8VPkgjIgRvpAL8bYrjMMd8@public.gmane.org> 2015-07-20 13:14 ` Thierry Reding 2015-07-20 13:14 ` Thierry Reding 2015-07-21 10:57 ` Peter De Schrijver 2015-07-21 10:57 ` Peter De Schrijver 2015-07-13 12:39 ` [PATCH V3 03/19] memory: tegra: add flush operation for Tegra30 memory clients Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-4-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 10:03 ` Thierry Reding 2015-07-17 10:03 ` Thierry Reding 2015-07-21 8:54 ` Jon Hunter 2015-07-21 8:54 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 04/19] memory: tegra: add flush operation for Tegra114 " Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-5-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 10:05 ` Thierry Reding 2015-07-17 10:05 ` Thierry Reding 2015-07-13 12:39 ` [PATCH V3 05/19] memory: tegra: add flush operation for Tegra124 " Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-17 10:05 ` Thierry Reding 2015-07-17 10:05 ` Thierry Reding 2015-07-13 12:39 ` [PATCH V3 07/19] soc: tegra: pmc: Wait for powergate state to change Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-8-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 10:17 ` Thierry Reding 2015-07-17 10:17 ` Thierry Reding 2015-07-21 9:34 ` Jon Hunter 2015-07-21 9:34 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 08/19] soc: tegra: pmc: Clean-up PMC helper functions Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-17 10:25 ` Thierry Reding 2015-07-17 10:25 ` Thierry Reding 2015-07-21 9:38 ` Jon Hunter 2015-07-21 9:38 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 14/19] Documentation: DT: bindings: Add power domain info for NVIDIA PMC Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-15-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 9:38 ` Thierry Reding 2015-07-17 9:38 ` Thierry Reding 2015-07-13 12:39 ` [PATCH V3 15/19] soc: tegra: pmc: Add generic PM domain support Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-16-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 11:29 ` Thierry Reding 2015-07-17 11:29 ` Thierry Reding 2015-07-13 12:39 ` [PATCH V3 16/19] soc: tegra: pmc: Remove the deprecated powergate APIs Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 18/19] ARM: tegra: add GPU power supply to Jetson TK1 DT Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-19-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 9:28 ` Thierry Reding 2015-07-17 9:28 ` Thierry Reding 2015-07-13 12:39 ` [PATCH V3 19/19] ARM: tegra: select PM_GENERIC_DOMAINS Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-13 13:50 ` Peter De Schrijver 2015-07-13 13:50 ` Peter De Schrijver [not found] ` <20150713135047.GR6287-Rysk9IDjsxmJz7etNGeUX8VPkgjIgRvpAL8bYrjMMd8@public.gmane.org> 2015-07-13 14:03 ` Jon Hunter 2015-07-13 14:03 ` Jon Hunter 2015-07-14 11:59 ` Jon Hunter 2015-07-14 11:59 ` Jon Hunter 2015-07-14 11:59 ` Jon Hunter [not found] ` <55A4F9B6.1070904-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-15 8:17 ` Peter De Schrijver 2015-07-15 8:17 ` Peter De Schrijver 2015-07-13 12:39 ` [PATCH V3 09/19] soc: tegra: pmc: Prepare for migrating to generic PM domains Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 10/19] drm/tegra: dc: Prepare for " Jon Hunter 2015-07-13 12:39 ` Jon Hunter [not found] ` <1436791197-32358-11-git-send-email-jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-17 10:41 ` Thierry Reding 2015-07-17 10:41 ` Thierry Reding 2015-07-28 8:30 ` Jon Hunter 2015-07-28 8:30 ` Jon Hunter [not found] ` <55B73D8C.103-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2015-07-28 11:20 ` Thierry Reding 2015-07-28 11:20 ` Thierry Reding [not found] ` <20150728112030.GA10949-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org> 2015-07-28 15:30 ` Jon Hunter 2015-07-28 15:30 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 11/19] PCI: tegra: Add support " Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-17 10:45 ` Thierry Reding 2015-07-17 10:45 ` Thierry Reding 2015-07-28 8:35 ` Jon Hunter 2015-07-28 8:35 ` Jon Hunter 2015-07-13 12:39 ` Jon Hunter [this message] 2015-07-13 12:39 ` [PATCH V3 12/19] ata: ahci_tegra: " Jon Hunter 2015-07-13 12:39 ` [PATCH V3 13/19] drm/tegra: gr3d: " Jon Hunter 2015-07-13 12:39 ` Jon Hunter 2015-07-13 12:39 ` [PATCH V3 17/19] ARM: tegra: Add PM domain device nodes to Tegra124 DT Jon Hunter 2015-07-13 12:39 ` Jon Hunter
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