From patchwork Tue Aug 3 09:06:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 12415679 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28D08C43214 for ; Tue, 3 Aug 2021 09:07:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FE2860EFD for ; Tue, 3 Aug 2021 09:07:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234974AbhHCJHU (ORCPT ); Tue, 3 Aug 2021 05:07:20 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:53370 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234750AbhHCJHU (ORCPT ); Tue, 3 Aug 2021 05:07:20 -0400 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id E108B220BD; Tue, 3 Aug 2021 09:07:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1627981628; h=from:from:reply-to: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=SgwLkp8O8987fATaDsy3i6QCKVCJxBkgKBxxICd32HQ=; b=cSFhXZAbqV4pP4izqb9kMI9BFtv+6+mkyPcOVblh0VTrLn0y4xQGguC4SJaxTXyfIJQSQL t9zPGadqX30cNFTpn4n/lFPv6Yg+qUoG0Ds/MVcviIN67FsG5P6sirsL7W2M9/7gG+bhmc /LvvECSYX1V/8ASUbFKUtVzOHjWSzz0= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1627981628; h=from:from:reply-to: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=SgwLkp8O8987fATaDsy3i6QCKVCJxBkgKBxxICd32HQ=; b=pUa7s786JIDA4+F5aa1yZK7e5RBykKZZshsmqE5tyspWYmfHsgyoPqO4fM+Dr7W8lz31lU h08pq2L4T1LAEDBQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 3648E13CC4; Tue, 3 Aug 2021 09:07:08 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id UKcQDDwHCWFVJQAAMHmgww (envelope-from ); Tue, 03 Aug 2021 09:07:08 +0000 From: Thomas Zimmermann To: daniel@ffwll.ch, airlied@linux.ie, alexander.deucher@amd.com, christian.koenig@amd.com, liviu.dudau@arm.com, brian.starkey@arm.com, sam@ravnborg.org, bbrezillon@kernel.org, nicolas.ferre@microchip.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, stefan@agner.ch, alison.wang@nxp.com, patrik.r.jakobsson@gmail.com, anitha.chrisanthus@intel.com, robdclark@gmail.com, edmund.j.dea@intel.com, sean@poorly.run, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, jyri.sarha@iki.fi, tomba@kernel.org, Dan.Sneddon@microchip.com, tomi.valkeinen@ideasonboard.com Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Thomas Zimmermann Subject: [PATCH v2 02/14] drm/arm/hdlcd: Convert to Linux IRQ interfaces Date: Tue, 3 Aug 2021 11:06:52 +0200 Message-Id: <20210803090704.32152-3-tzimmermann@suse.de> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210803090704.32152-1-tzimmermann@suse.de> References: <20210803090704.32152-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Drop the DRM IRQ midlayer in favor of Linux IRQ interfaces. DRM's IRQ helpers are mostly useful for UMS drivers. Modern KMS drivers don't benefit from using it. DRM IRQ callbacks are now being called directly or inlined. Calls to platform_get_irq() can fail with a negative errno code. Abort initialization in this case. The DRM IRQ midlayer does not handle this case correctly. v2: * name struct drm_device variables 'drm' (Sam) Signed-off-by: Thomas Zimmermann Acked-by: Sam Ravnborg Acked-by: Liviu Dudau --- drivers/gpu/drm/arm/hdlcd_drv.c | 174 ++++++++++++++++++-------------- drivers/gpu/drm/arm/hdlcd_drv.h | 1 + 2 files changed, 97 insertions(+), 78 deletions(-) diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c index 81ae92390736..479c2422a2e0 100644 --- a/drivers/gpu/drm/arm/hdlcd_drv.c +++ b/drivers/gpu/drm/arm/hdlcd_drv.c @@ -29,7 +29,6 @@ #include #include #include -#include #include #include #include @@ -38,6 +37,94 @@ #include "hdlcd_drv.h" #include "hdlcd_regs.h" +static irqreturn_t hdlcd_irq(int irq, void *arg) +{ + struct drm_device *drm = arg; + struct hdlcd_drm_private *hdlcd = drm->dev_private; + unsigned long irq_status; + + irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS); + +#ifdef CONFIG_DEBUG_FS + if (irq_status & HDLCD_INTERRUPT_UNDERRUN) + atomic_inc(&hdlcd->buffer_underrun_count); + + if (irq_status & HDLCD_INTERRUPT_DMA_END) + atomic_inc(&hdlcd->dma_end_count); + + if (irq_status & HDLCD_INTERRUPT_BUS_ERROR) + atomic_inc(&hdlcd->bus_error_count); + + if (irq_status & HDLCD_INTERRUPT_VSYNC) + atomic_inc(&hdlcd->vsync_count); + +#endif + if (irq_status & HDLCD_INTERRUPT_VSYNC) + drm_crtc_handle_vblank(&hdlcd->crtc); + + /* acknowledge interrupt(s) */ + hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, irq_status); + + return IRQ_HANDLED; +} + +static void hdlcd_irq_preinstall(struct drm_device *drm) +{ + struct hdlcd_drm_private *hdlcd = drm->dev_private; + /* Ensure interrupts are disabled */ + hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0); + hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, ~0); +} + +static void hdlcd_irq_postinstall(struct drm_device *drm) +{ +#ifdef CONFIG_DEBUG_FS + struct hdlcd_drm_private *hdlcd = drm->dev_private; + unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK); + + /* enable debug interrupts */ + irq_mask |= HDLCD_DEBUG_INT_MASK; + + hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask); +#endif +} + +static int hdlcd_irq_install(struct drm_device *drm, int irq) +{ + int ret; + + if (irq == IRQ_NOTCONNECTED) + return -ENOTCONN; + + hdlcd_irq_preinstall(drm); + + ret = request_irq(irq, hdlcd_irq, 0, drm->driver->name, drm); + if (ret) + return ret; + + hdlcd_irq_postinstall(drm); + + return 0; +} + +static void hdlcd_irq_uninstall(struct drm_device *drm) +{ + struct hdlcd_drm_private *hdlcd = drm->dev_private; + /* disable all the interrupts that we might have enabled */ + unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK); + +#ifdef CONFIG_DEBUG_FS + /* disable debug interrupts */ + irq_mask &= ~HDLCD_DEBUG_INT_MASK; +#endif + + /* disable vsync interrupts */ + irq_mask &= ~HDLCD_INTERRUPT_VSYNC; + hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask); + + free_irq(hdlcd->irq, drm); +} + static int hdlcd_load(struct drm_device *drm, unsigned long flags) { struct hdlcd_drm_private *hdlcd = drm->dev_private; @@ -90,7 +177,12 @@ static int hdlcd_load(struct drm_device *drm, unsigned long flags) goto setup_fail; } - ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto irq_fail; + hdlcd->irq = ret; + + ret = hdlcd_irq_install(drm, hdlcd->irq); if (ret < 0) { DRM_ERROR("failed to install IRQ handler\n"); goto irq_fail; @@ -122,76 +214,6 @@ static void hdlcd_setup_mode_config(struct drm_device *drm) drm->mode_config.funcs = &hdlcd_mode_config_funcs; } -static irqreturn_t hdlcd_irq(int irq, void *arg) -{ - struct drm_device *drm = arg; - struct hdlcd_drm_private *hdlcd = drm->dev_private; - unsigned long irq_status; - - irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS); - -#ifdef CONFIG_DEBUG_FS - if (irq_status & HDLCD_INTERRUPT_UNDERRUN) - atomic_inc(&hdlcd->buffer_underrun_count); - - if (irq_status & HDLCD_INTERRUPT_DMA_END) - atomic_inc(&hdlcd->dma_end_count); - - if (irq_status & HDLCD_INTERRUPT_BUS_ERROR) - atomic_inc(&hdlcd->bus_error_count); - - if (irq_status & HDLCD_INTERRUPT_VSYNC) - atomic_inc(&hdlcd->vsync_count); - -#endif - if (irq_status & HDLCD_INTERRUPT_VSYNC) - drm_crtc_handle_vblank(&hdlcd->crtc); - - /* acknowledge interrupt(s) */ - hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, irq_status); - - return IRQ_HANDLED; -} - -static void hdlcd_irq_preinstall(struct drm_device *drm) -{ - struct hdlcd_drm_private *hdlcd = drm->dev_private; - /* Ensure interrupts are disabled */ - hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0); - hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, ~0); -} - -static int hdlcd_irq_postinstall(struct drm_device *drm) -{ -#ifdef CONFIG_DEBUG_FS - struct hdlcd_drm_private *hdlcd = drm->dev_private; - unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK); - - /* enable debug interrupts */ - irq_mask |= HDLCD_DEBUG_INT_MASK; - - hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask); -#endif - return 0; -} - -static void hdlcd_irq_uninstall(struct drm_device *drm) -{ - struct hdlcd_drm_private *hdlcd = drm->dev_private; - /* disable all the interrupts that we might have enabled */ - unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK); - -#ifdef CONFIG_DEBUG_FS - /* disable debug interrupts */ - irq_mask &= ~HDLCD_DEBUG_INT_MASK; -#endif - - /* disable vsync interrupts */ - irq_mask &= ~HDLCD_INTERRUPT_VSYNC; - - hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask); -} - #ifdef CONFIG_DEBUG_FS static int hdlcd_show_underrun_count(struct seq_file *m, void *arg) { @@ -236,10 +258,6 @@ DEFINE_DRM_GEM_CMA_FOPS(fops); static const struct drm_driver hdlcd_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, - .irq_handler = hdlcd_irq, - .irq_preinstall = hdlcd_irq_preinstall, - .irq_postinstall = hdlcd_irq_postinstall, - .irq_uninstall = hdlcd_irq_uninstall, DRM_GEM_CMA_DRIVER_OPS, #ifdef CONFIG_DEBUG_FS .debugfs_init = hdlcd_debugfs_init, @@ -316,7 +334,7 @@ static int hdlcd_drm_bind(struct device *dev) err_unload: of_node_put(hdlcd->crtc.port); hdlcd->crtc.port = NULL; - drm_irq_uninstall(drm); + hdlcd_irq_uninstall(drm); of_reserved_mem_device_release(drm->dev); err_free: drm_mode_config_cleanup(drm); @@ -338,7 +356,7 @@ static void hdlcd_drm_unbind(struct device *dev) hdlcd->crtc.port = NULL; pm_runtime_get_sync(dev); drm_atomic_helper_shutdown(drm); - drm_irq_uninstall(drm); + hdlcd_irq_uninstall(drm); pm_runtime_put(dev); if (pm_runtime_enabled(dev)) pm_runtime_disable(dev); diff --git a/drivers/gpu/drm/arm/hdlcd_drv.h b/drivers/gpu/drm/arm/hdlcd_drv.h index fd438d177b64..909c39c28487 100644 --- a/drivers/gpu/drm/arm/hdlcd_drv.h +++ b/drivers/gpu/drm/arm/hdlcd_drv.h @@ -11,6 +11,7 @@ struct hdlcd_drm_private { struct clk *clk; struct drm_crtc crtc; struct drm_plane *plane; + unsigned int irq; #ifdef CONFIG_DEBUG_FS atomic_t buffer_underrun_count; atomic_t bus_error_count;