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[109.252.192.57]) by smtp.gmail.com with ESMTPSA id u5sm655596lff.78.2020.12.17.10.07.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Dec 2020 10:07:58 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Mark Brown , Liam Girdwood , Ulf Hansson , Mauro Carvalho Chehab , Rob Herring , Peter Geis , Nicolas Chauvet , Krzysztof Kozlowski , "Rafael J. Wysocki" , Kevin Hilman , Peter De Schrijver , Viresh Kumar , Stephen Boyd , Michael Turquette Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linux-tegra@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v2 34/48] gpu: host1x: Support power management Date: Thu, 17 Dec 2020 21:06:24 +0300 Message-Id: <20201217180638.22748-35-digetx@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201217180638.22748-1-digetx@gmail.com> References: <20201217180638.22748-1-digetx@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add suspend/resume and generic power domain support to the Host1x driver. This is required for enabling system-wide DVFS and supporting dynamic power management using a generic power domain. Tested-by: Peter Geis Tested-by: Nicolas Chauvet Signed-off-by: Dmitry Osipenko --- drivers/gpu/host1x/dev.c | 102 ++++++++++++++++++++++++++++++++++----- 1 file changed, 91 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index d0ebb70e2fdd..c1525cffe7b1 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #define CREATE_TRACE_POINTS @@ -417,7 +418,7 @@ static int host1x_probe(struct platform_device *pdev) return err; } - host->rst = devm_reset_control_get(&pdev->dev, "host1x"); + host->rst = devm_reset_control_get_exclusive_released(&pdev->dev, "host1x"); if (IS_ERR(host->rst)) { err = PTR_ERR(host->rst); dev_err(&pdev->dev, "failed to get reset: %d\n", err); @@ -437,16 +438,15 @@ static int host1x_probe(struct platform_device *pdev) goto iommu_exit; } - err = clk_prepare_enable(host->clk); - if (err < 0) { - dev_err(&pdev->dev, "failed to enable clock\n"); - goto free_channels; - } + pm_runtime_enable(&pdev->dev); + err = pm_runtime_get_sync(&pdev->dev); + if (err < 0) + goto rpm_disable; err = reset_control_deassert(host->rst); if (err < 0) { dev_err(&pdev->dev, "failed to deassert reset: %d\n", err); - goto unprepare_disable; + goto rpm_disable; } err = host1x_syncpt_init(host); @@ -485,9 +485,10 @@ static int host1x_probe(struct platform_device *pdev) host1x_syncpt_deinit(host); reset_assert: reset_control_assert(host->rst); -unprepare_disable: - clk_disable_unprepare(host->clk); -free_channels: +rpm_disable: + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + host1x_channel_list_free(&host->channel_list); iommu_exit: host1x_iommu_exit(host); @@ -504,16 +505,95 @@ static int host1x_remove(struct platform_device *pdev) host1x_intr_deinit(host); host1x_syncpt_deinit(host); reset_control_assert(host->rst); - clk_disable_unprepare(host->clk); + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); host1x_iommu_exit(host); return 0; } +static int __maybe_unused host1x_runtime_suspend(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + + clk_disable_unprepare(host->clk); + reset_control_release(host->rst); + + return 0; +} + +static int __maybe_unused host1x_runtime_resume(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + int err; + + err = reset_control_acquire(host->rst); + if (err) { + dev_err(dev, "failed to acquire reset: %d\n", err); + return err; + } + + err = clk_prepare_enable(host->clk); + if (err) { + dev_err(dev, "failed to enable clock: %d\n", err); + goto release_reset; + } + + return 0; + +release_reset: + reset_control_release(host->rst); + + return err; +} + +static __maybe_unused int host1x_suspend(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + int err; + + host1x_syncpt_save(host); + + err = pm_runtime_force_suspend(dev); + if (err < 0) + return err; + + return 0; +} + +static __maybe_unused int host1x_resume(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + struct host1x_channel *channel; + unsigned int index; + int err; + + err = pm_runtime_force_resume(dev); + if (err < 0) + return err; + + host1x_syncpt_restore(host); + + for_each_set_bit(index, host->channel_list.allocated_channels, + host->info->nb_channels) { + channel = &host->channel_list.channels[index]; + host1x_hw_channel_init(host, channel, channel->id); + } + + return 0; +} + +static const struct dev_pm_ops host1x_pm = { + SET_RUNTIME_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume, + NULL) + SET_SYSTEM_SLEEP_PM_OPS(host1x_suspend, host1x_resume) +}; + static struct platform_driver tegra_host1x_driver = { .driver = { .name = "tegra-host1x", .of_match_table = host1x_of_match, + .pm = &host1x_pm, }, .probe = host1x_probe, .remove = host1x_remove,