From patchwork Thu Feb 27 16:58:04 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 13994944 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2DF61C282C6 for ; Thu, 27 Feb 2025 17:07:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1AF0110EB4A; Thu, 27 Feb 2025 17:07:28 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=denx.de header.i=@denx.de header.b="C9u7OYl/"; dkim-atps=neutral Received: from mx.denx.de (mx.denx.de [89.58.32.78]) by gabe.freedesktop.org (Postfix) with ESMTPS id F34BC10EB45 for ; Thu, 27 Feb 2025 17:07:21 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 3656710382F22; Thu, 27 Feb 2025 18:00:49 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=mx-20241105; t=1740675650; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Cr2T/qLGB0lwW96DWD8/vn79iF6uSlhDoMgeSvZtY94=; b=C9u7OYl/kCgGFNXv4fgqJPN5xUljK3pSWs9pfuRzXI7Z2Ok0IBxAIkJopoHgkFZgm6oqU3 RCT16E2KiWU/pBZFZtinFrdrOjU4CwXCJ79ddZzqAMPLHKQbhE8Rp3StAkdrXd1XhudYkR 8qmj+dtW3bJRAPRzmWkRKEKPfeBzPvH6kvZoJncJslrOSam6RzGrFcCpRo7DqQzUKgZ0ic 18ZNB0MGmhVymPTifxaRH30Sh2K4PEQ1iWAgjRoTwMpo+lbc0iw1xK0q+A61eShDVoy4Hn GLmr37DUmqNoMpgGNpAqK/Crt1lqH8WDAX1KoeoFZqhJHp2F8ys6kyFrv9dOjw== From: Marek Vasut To: linux-arm-kernel@lists.infradead.org Cc: Marek Vasut , Boris Brezillon , Conor Dooley , David Airlie , Fabio Estevam , Krzysztof Kozlowski , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Pengutronix Kernel Team , Philipp Zabel , Rob Herring , Sascha Hauer , Sebastian Reichel , Shawn Guo , Simona Vetter , Steven Price , Thomas Zimmermann , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, imx@lists.linux.dev Subject: [PATCH 4/9] drm/panthor: Implement optional reset Date: Thu, 27 Feb 2025 17:58:04 +0100 Message-ID: <20250227170012.124768-5-marex@denx.de> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250227170012.124768-1-marex@denx.de> References: <20250227170012.124768-1-marex@denx.de> MIME-Version: 1.0 X-Last-TLS-Session-Version: TLSv1.3 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The instance of the GPU populated in Freescale i.MX95 does require release from reset by writing into a single GPUMIX block controller GPURESET register bit 0. Implement support for one optional reset. Signed-off-by: Marek Vasut --- Cc: Boris Brezillon Cc: Conor Dooley Cc: David Airlie Cc: Fabio Estevam Cc: Krzysztof Kozlowski Cc: Liviu Dudau Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Pengutronix Kernel Team Cc: Philipp Zabel Cc: Rob Herring Cc: Sascha Hauer Cc: Sebastian Reichel Cc: Shawn Guo Cc: Simona Vetter Cc: Steven Price Cc: Thomas Zimmermann Cc: devicetree@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: imx@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org --- drivers/gpu/drm/panthor/Kconfig | 1 + drivers/gpu/drm/panthor/panthor_device.c | 23 +++++++++++++++++++++++ drivers/gpu/drm/panthor/panthor_device.h | 3 +++ 3 files changed, 27 insertions(+) diff --git a/drivers/gpu/drm/panthor/Kconfig b/drivers/gpu/drm/panthor/Kconfig index 55b40ad07f3b0..ab62bd6a0750f 100644 --- a/drivers/gpu/drm/panthor/Kconfig +++ b/drivers/gpu/drm/panthor/Kconfig @@ -14,6 +14,7 @@ config DRM_PANTHOR select IOMMU_IO_PGTABLE_LPAE select IOMMU_SUPPORT select PM_DEVFREQ + select RESET_SIMPLE if SOC_IMX9 help DRM driver for ARM Mali CSF-based GPUs. diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c index a9da1d1eeb707..51ee9cae94504 100644 --- a/drivers/gpu/drm/panthor/panthor_device.c +++ b/drivers/gpu/drm/panthor/panthor_device.c @@ -64,6 +64,17 @@ static int panthor_clk_init(struct panthor_device *ptdev) return 0; } +static int panthor_reset_init(struct panthor_device *ptdev) +{ + ptdev->resets = devm_reset_control_get_optional_exclusive_deasserted(ptdev->base.dev, NULL); + if (IS_ERR(ptdev->resets)) + return dev_err_probe(ptdev->base.dev, + PTR_ERR(ptdev->resets), + "get reset failed"); + + return 0; +} + void panthor_device_unplug(struct panthor_device *ptdev) { /* This function can be called from two different path: the reset work @@ -217,6 +228,10 @@ int panthor_device_init(struct panthor_device *ptdev) if (ret) return ret; + ret = panthor_reset_init(ptdev); + if (ret) + return ret; + ret = panthor_devfreq_init(ptdev); if (ret) return ret; @@ -470,6 +485,10 @@ int panthor_device_resume(struct device *dev) if (ret) goto err_disable_stacks_clk; + ret = reset_control_deassert(ptdev->resets); + if (ret) + goto err_disable_coregroup_clk; + panthor_devfreq_resume(ptdev); if (panthor_device_is_initialized(ptdev) && @@ -512,6 +531,9 @@ int panthor_device_resume(struct device *dev) err_suspend_devfreq: panthor_devfreq_suspend(ptdev); + reset_control_assert(ptdev->resets); + +err_disable_coregroup_clk: clk_disable_unprepare(ptdev->clks.coregroup); err_disable_stacks_clk: @@ -563,6 +585,7 @@ int panthor_device_suspend(struct device *dev) panthor_devfreq_suspend(ptdev); + reset_control_assert(ptdev->resets); clk_disable_unprepare(ptdev->clks.coregroup); clk_disable_unprepare(ptdev->clks.stacks); clk_disable_unprepare(ptdev->clks.core); diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h index da6574021664b..fea3a05778e2e 100644 --- a/drivers/gpu/drm/panthor/panthor_device.h +++ b/drivers/gpu/drm/panthor/panthor_device.h @@ -111,6 +111,9 @@ struct panthor_device { struct clk *coregroup; } clks; + /** @resets: GPU reset. */ + struct reset_control *resets; + /** @coherent: True if the CPU/GPU are memory coherent. */ bool coherent;