Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754637Ab3JHGch (ORCPT ); Tue, 8 Oct 2013 02:32:37 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:2447 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754357Ab3JHGcD (ORCPT ); Tue, 8 Oct 2013 02:32:03 -0400 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Mon, 07 Oct 2013 23:32:03 -0700 From: Arto Merilainen To: , CC: , , , , Subject: [PATCHv4 5/5] gpu: host1x: Add runtime pm support for host1x Date: Tue, 8 Oct 2013 09:27:28 +0300 Message-ID: <1381213648-5931-6-git-send-email-amerilainen@nvidia.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1381213648-5931-1-git-send-email-amerilainen@nvidia.com> References: <1381213648-5931-1-git-send-email-amerilainen@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3539 Lines: 139 From: Mayuresh Kulkarni This patch adds runtime pm support for host1x hardware unit. This allows host1x clock to be turned off when it is idle. If pm runtime is not configured, we enable host1x clock in device probe and disable it in remove. Signed-off-by: Mayuresh Kulkarni Signed-off-by: Arto Merilainen --- drivers/gpu/host1x/dev.c | 56 +++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 48 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index 4716302..1179b78 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -23,6 +23,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -34,6 +35,27 @@ #include "hw/host1x01.h" #include "host1x_client.h" +static int host1x_runtime_suspend(struct device *dev) +{ + struct host1x *host = dev_get_drvdata(dev); + + clk_disable_unprepare(host->clk); + + return 0; +} + +static int host1x_runtime_resume(struct device *dev) +{ + int err = 0; + struct host1x *host = dev_get_drvdata(dev); + + err = clk_prepare_enable(host->clk); + if (err < 0) + dev_err(dev, "failed to enable clock\n"); + + return err; +} + void host1x_set_drm_data(struct device *dev, void *data) { struct host1x *host1x = dev_get_drvdata(dev); @@ -143,32 +165,42 @@ static int host1x_probe(struct platform_device *pdev) return err; } - err = clk_prepare_enable(host->clk); - if (err < 0) { - dev_err(&pdev->dev, "failed to enable clock\n"); - return err; + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + err = host1x_runtime_resume(&pdev->dev); + if (err < 0) + return err; } + pm_runtime_get_sync(&pdev->dev); + err = host1x_syncpt_init(host); if (err) { dev_err(&pdev->dev, "failed to initialize syncpts\n"); - return err; + goto err_syncpt_init; } err = host1x_intr_init(host, syncpt_irq); if (err) { dev_err(&pdev->dev, "failed to initialize interrupts\n"); - goto fail_deinit_syncpt; + goto err_intr_init; } host1x_debug_init(host); host1x_drm_alloc(pdev); + pm_runtime_put(&pdev->dev); + return 0; -fail_deinit_syncpt: +err_intr_init: host1x_syncpt_deinit(host); +err_syncpt_init: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + pm_runtime_disable(&pdev->dev); + return err; } @@ -178,11 +210,18 @@ static int __exit host1x_remove(struct platform_device *pdev) host1x_intr_deinit(host); host1x_syncpt_deinit(host); - clk_disable_unprepare(host->clk); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + host1x_runtime_suspend(&pdev->dev); return 0; } +static const struct dev_pm_ops host1x_pm_ops = { + SET_RUNTIME_PM_OPS(host1x_runtime_suspend, host1x_runtime_resume, NULL) +}; + static struct platform_driver tegra_host1x_driver = { .probe = host1x_probe, .remove = __exit_p(host1x_remove), @@ -190,6 +229,7 @@ static struct platform_driver tegra_host1x_driver = { .owner = THIS_MODULE, .name = "tegra-host1x", .of_match_table = host1x_of_match, + .pm = &host1x_pm_ops, }, }; -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/