From patchwork Tue Jul 18 16:54:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 13317472 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12D84C001DF for ; Tue, 18 Jul 2023 16:55:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233366AbjGRQzQ (ORCPT ); Tue, 18 Jul 2023 12:55:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232720AbjGRQzB (ORCPT ); Tue, 18 Jul 2023 12:55:01 -0400 Received: from albert.telenet-ops.be (albert.telenet-ops.be [IPv6:2a02:1800:110:4::f00:1a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05F1219A1 for ; Tue, 18 Jul 2023 09:54:54 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed40:5803:2d6d:5bbc:e252]) by albert.telenet-ops.be with bizsmtp id Ngur2A00B0ucMBo06gurSZ; Tue, 18 Jul 2023 18:54:51 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtp (Exim 4.95) (envelope-from ) id 1qLnyD-001nXt-56; Tue, 18 Jul 2023 18:54:51 +0200 Received: from geert by rox.of.borg with local (Exim 4.95) (envelope-from ) id 1qLnyN-000gbe-6A; Tue, 18 Jul 2023 18:54:51 +0200 From: Geert Uytterhoeven To: Laurent Pinchart , Kieran Bingham , David Airlie , Daniel Vetter , Thomas Zimmermann , Magnus Damm Cc: linux-renesas-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v2 07/41] drm: renesas: shmobile: Add support for Runtime PM Date: Tue, 18 Jul 2023 18:54:12 +0200 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The SH-Mobile LCD Controller is part of a PM Domain on all relevant SoCs (clock domain on all, power domain on some). Hence it may not be sufficient to manage the LCDC module clock explicitly (e.g. if the selected clock source differs from SHMOB_DRM_CLK_BUS). Fix this by using Runtime PM for all clock handling. Add an explicit dependency on CONFIG_PM, which should already be met on all affected platforms. Signed-off-by: Geert Uytterhoeven --- v2: - Move explicit clock handling to Runtime PM callbacks, - Move devm_pm_runtime_enable() after shmob_drm_setup_clocks(), - Depend on PM. --- drivers/gpu/drm/renesas/shmobile/Kconfig | 2 +- .../gpu/drm/renesas/shmobile/shmob_drm_crtc.c | 32 ++-------------- .../gpu/drm/renesas/shmobile/shmob_drm_drv.c | 38 +++++++++++++++++-- 3 files changed, 40 insertions(+), 32 deletions(-) diff --git a/drivers/gpu/drm/renesas/shmobile/Kconfig b/drivers/gpu/drm/renesas/shmobile/Kconfig index ad14112999ad8aba..ba941587ca70e08c 100644 --- a/drivers/gpu/drm/renesas/shmobile/Kconfig +++ b/drivers/gpu/drm/renesas/shmobile/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 config DRM_SHMOBILE tristate "DRM Support for SH Mobile" - depends on DRM + depends on DRM && PM depends on ARCH_RENESAS || ARCH_SHMOBILE || COMPILE_TEST select BACKLIGHT_CLASS_DEVICE select DRM_KMS_HELPER diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c index fbfd906844da490c..2d9ae0c6ab7b18a8 100644 --- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c +++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c @@ -9,6 +9,7 @@ #include #include +#include #include #include @@ -34,29 +35,6 @@ * TODO: panel support */ -/* ----------------------------------------------------------------------------- - * Clock management - */ - -static int shmob_drm_clk_on(struct shmob_drm_device *sdev) -{ - int ret; - - if (sdev->clock) { - ret = clk_prepare_enable(sdev->clock); - if (ret < 0) - return ret; - } - - return 0; -} - -static void shmob_drm_clk_off(struct shmob_drm_device *sdev) -{ - if (sdev->clock) - clk_disable_unprepare(sdev->clock); -} - /* ----------------------------------------------------------------------------- * CRTC */ @@ -170,9 +148,8 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc) if (WARN_ON(format == NULL)) return; - /* Enable clocks before accessing the hardware. */ - ret = shmob_drm_clk_on(sdev); - if (ret < 0) + ret = pm_runtime_resume_and_get(sdev->dev); + if (ret) return; /* Reset and enable the LCDC. */ @@ -268,8 +245,7 @@ static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc) /* Disable the display output. */ lcdc_write(sdev, LDCNT1R, 0); - /* Stop clocks. */ - shmob_drm_clk_off(sdev); + pm_runtime_put(sdev->dev); scrtc->started = false; } diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c index 30493ce874192e3e..3fc7d820abdc61d4 100644 --- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c +++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -165,8 +166,35 @@ static int shmob_drm_pm_resume(struct device *dev) return 0; } -static DEFINE_SIMPLE_DEV_PM_OPS(shmob_drm_pm_ops, - shmob_drm_pm_suspend, shmob_drm_pm_resume); +static int shmob_drm_pm_runtime_suspend(struct device *dev) +{ + struct shmob_drm_device *sdev = dev_get_drvdata(dev); + + if (sdev->clock) + clk_disable_unprepare(sdev->clock); + + return 0; +} + +static int shmob_drm_pm_runtime_resume(struct device *dev) +{ + struct shmob_drm_device *sdev = dev_get_drvdata(dev); + int ret; + + if (sdev->clock) { + ret = clk_prepare_enable(sdev->clock); + if (ret < 0) + return ret; + } + + return 0; +} + +static const struct dev_pm_ops shmob_drm_pm_ops = { + SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume) + RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend, + shmob_drm_pm_runtime_resume, NULL) +}; /* ----------------------------------------------------------------------------- * Platform driver @@ -220,6 +248,10 @@ static int shmob_drm_probe(struct platform_device *pdev) if (ret < 0) return ret; + ret = devm_pm_runtime_enable(&pdev->dev); + if (ret) + return ret; + ret = shmob_drm_init_interface(sdev); if (ret < 0) return ret; @@ -291,7 +323,7 @@ static struct platform_driver shmob_drm_platform_driver = { .remove = shmob_drm_remove, .driver = { .name = "shmob-drm", - .pm = pm_sleep_ptr(&shmob_drm_pm_ops), + .pm = &shmob_drm_pm_ops, }, };