From mboxrd@z Thu Jan 1 00:00:00 1970 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 EDF4DCCA496 for ; Tue, 7 Jun 2022 20:52:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378771AbiFGUwb (ORCPT ); Tue, 7 Jun 2022 16:52:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358566AbiFGTwm (ORCPT ); Tue, 7 Jun 2022 15:52:42 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5590185CA3; Tue, 7 Jun 2022 11:21:06 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id B02D1CE2439; Tue, 7 Jun 2022 18:21:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6DC8C385A2; Tue, 7 Jun 2022 18:21:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654626063; bh=aXwQzVtydkB9yWcYLkNJhXrkBnNnBNlwgcpy29iTRhc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pVpO+7nllAOK1j1yQmPL/wgH6t5wx7dujZzu7s9NzkdUEJTgoyvtCANNAftZh/UPR 0vQz5hvCbNQWvGTOH+Pllt9136Fqc8OuAZbVT2SCofkOcwBEYWM+IClKDw6mtzUwt/ ZRYDhfkD971UexABDpnSr1goFRP9lSyma1kW7qyY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Rex-BC Chen , "jason-jh.lin" , Chun-Kuang Hu , Sasha Levin Subject: [PATCH 5.17 243/772] drm/mediatek: Add vblank register/unregister callback functions Date: Tue, 7 Jun 2022 18:57:15 +0200 Message-Id: <20220607164956.188160947@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607164948.980838585@linuxfoundation.org> References: <20220607164948.980838585@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rex-BC Chen [ Upstream commit b74d921b900b6ce38c6247c0a1c86be9f3746493 ] We encountered a kernel panic issue that callback data will be NULL when it's using in ovl irq handler. There is a timing issue between mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank(). To resolve this issue, we use the flow to register/unregister vblank cb: - Register callback function and callback data when crtc creates. - Unregister callback function and callback data when crtc destroies. With this solution, we can assure callback data will not be NULL when vblank is disable. Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220321072320.15019-1-rex-bc.chen@mediatek.com/ Fixes: 9b0704988b15 ("drm/mediatek: Register vblank callback function") Signed-off-by: Rex-BC Chen Reviewed-by: jason-jh.lin Signed-off-by: Chun-Kuang Hu Signed-off-by: Sasha Levin --- drivers/gpu/drm/mediatek/mtk_disp_drv.h | 16 +++++++----- drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 22 ++++++++++++---- drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 20 +++++++++----- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 14 +++++++++- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 4 +++ drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 29 ++++++++++++++++----- 6 files changed, 80 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h index 86c3068894b1..974462831133 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h @@ -76,9 +76,11 @@ void mtk_ovl_layer_off(struct device *dev, unsigned int idx, void mtk_ovl_start(struct device *dev); void mtk_ovl_stop(struct device *dev); unsigned int mtk_ovl_supported_rotations(struct device *dev); -void mtk_ovl_enable_vblank(struct device *dev, - void (*vblank_cb)(void *), - void *vblank_cb_data); +void mtk_ovl_register_vblank_cb(struct device *dev, + void (*vblank_cb)(void *), + void *vblank_cb_data); +void mtk_ovl_unregister_vblank_cb(struct device *dev); +void mtk_ovl_enable_vblank(struct device *dev); void mtk_ovl_disable_vblank(struct device *dev); void mtk_rdma_bypass_shadow(struct device *dev); @@ -93,9 +95,11 @@ void mtk_rdma_layer_config(struct device *dev, unsigned int idx, struct cmdq_pkt *cmdq_pkt); void mtk_rdma_start(struct device *dev); void mtk_rdma_stop(struct device *dev); -void mtk_rdma_enable_vblank(struct device *dev, - void (*vblank_cb)(void *), - void *vblank_cb_data); +void mtk_rdma_register_vblank_cb(struct device *dev, + void (*vblank_cb)(void *), + void *vblank_cb_data); +void mtk_rdma_unregister_vblank_cb(struct device *dev); +void mtk_rdma_enable_vblank(struct device *dev); void mtk_rdma_disable_vblank(struct device *dev); #endif diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c index 2146299e5f52..1fa1bbac9f9c 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c @@ -96,14 +96,28 @@ static irqreturn_t mtk_disp_ovl_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } -void mtk_ovl_enable_vblank(struct device *dev, - void (*vblank_cb)(void *), - void *vblank_cb_data) +void mtk_ovl_register_vblank_cb(struct device *dev, + void (*vblank_cb)(void *), + void *vblank_cb_data) { struct mtk_disp_ovl *ovl = dev_get_drvdata(dev); ovl->vblank_cb = vblank_cb; ovl->vblank_cb_data = vblank_cb_data; +} + +void mtk_ovl_unregister_vblank_cb(struct device *dev) +{ + struct mtk_disp_ovl *ovl = dev_get_drvdata(dev); + + ovl->vblank_cb = NULL; + ovl->vblank_cb_data = NULL; +} + +void mtk_ovl_enable_vblank(struct device *dev) +{ + struct mtk_disp_ovl *ovl = dev_get_drvdata(dev); + writel(0x0, ovl->regs + DISP_REG_OVL_INTSTA); writel_relaxed(OVL_FME_CPL_INT, ovl->regs + DISP_REG_OVL_INTEN); } @@ -112,8 +126,6 @@ void mtk_ovl_disable_vblank(struct device *dev) { struct mtk_disp_ovl *ovl = dev_get_drvdata(dev); - ovl->vblank_cb = NULL; - ovl->vblank_cb_data = NULL; writel_relaxed(0x0, ovl->regs + DISP_REG_OVL_INTEN); } diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c index d41a3970b944..943780fc7bf6 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c @@ -94,24 +94,32 @@ static void rdma_update_bits(struct device *dev, unsigned int reg, writel(tmp, rdma->regs + reg); } -void mtk_rdma_enable_vblank(struct device *dev, - void (*vblank_cb)(void *), - void *vblank_cb_data) +void mtk_rdma_register_vblank_cb(struct device *dev, + void (*vblank_cb)(void *), + void *vblank_cb_data) { struct mtk_disp_rdma *rdma = dev_get_drvdata(dev); rdma->vblank_cb = vblank_cb; rdma->vblank_cb_data = vblank_cb_data; - rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT, - RDMA_FRAME_END_INT); } -void mtk_rdma_disable_vblank(struct device *dev) +void mtk_rdma_unregister_vblank_cb(struct device *dev) { struct mtk_disp_rdma *rdma = dev_get_drvdata(dev); rdma->vblank_cb = NULL; rdma->vblank_cb_data = NULL; +} + +void mtk_rdma_enable_vblank(struct device *dev) +{ + rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT, + RDMA_FRAME_END_INT); +} + +void mtk_rdma_disable_vblank(struct device *dev) +{ rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT, 0); } diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index d661edf7e0fe..e42a9bfa0ecb 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -152,6 +152,7 @@ static void mtk_drm_cmdq_pkt_destroy(struct cmdq_pkt *pkt) static void mtk_drm_crtc_destroy(struct drm_crtc *crtc) { struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); + int i; mtk_mutex_put(mtk_crtc->mutex); #if IS_REACHABLE(CONFIG_MTK_CMDQ) @@ -162,6 +163,14 @@ static void mtk_drm_crtc_destroy(struct drm_crtc *crtc) mtk_crtc->cmdq_client.chan = NULL; } #endif + + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) { + struct mtk_ddp_comp *comp; + + comp = mtk_crtc->ddp_comp[i]; + mtk_ddp_comp_unregister_vblank_cb(comp); + } + drm_crtc_cleanup(crtc); } @@ -616,7 +625,7 @@ static int mtk_drm_crtc_enable_vblank(struct drm_crtc *crtc) struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0]; - mtk_ddp_comp_enable_vblank(comp, mtk_crtc_ddp_irq, &mtk_crtc->base); + mtk_ddp_comp_enable_vblank(comp); return 0; } @@ -916,6 +925,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, if (comp->funcs->ctm_set) has_ctm = true; } + + mtk_ddp_comp_register_vblank_cb(comp, mtk_crtc_ddp_irq, + &mtk_crtc->base); } for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index b4b682bc1991..028cf76b9531 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -297,6 +297,8 @@ static const struct mtk_ddp_comp_funcs ddp_ovl = { .config = mtk_ovl_config, .start = mtk_ovl_start, .stop = mtk_ovl_stop, + .register_vblank_cb = mtk_ovl_register_vblank_cb, + .unregister_vblank_cb = mtk_ovl_unregister_vblank_cb, .enable_vblank = mtk_ovl_enable_vblank, .disable_vblank = mtk_ovl_disable_vblank, .supported_rotations = mtk_ovl_supported_rotations, @@ -321,6 +323,8 @@ static const struct mtk_ddp_comp_funcs ddp_rdma = { .config = mtk_rdma_config, .start = mtk_rdma_start, .stop = mtk_rdma_stop, + .register_vblank_cb = mtk_rdma_register_vblank_cb, + .unregister_vblank_cb = mtk_rdma_unregister_vblank_cb, .enable_vblank = mtk_rdma_enable_vblank, .disable_vblank = mtk_rdma_disable_vblank, .layer_nr = mtk_rdma_layer_nr, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h index 4c6a98662305..b83f24cb045f 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h @@ -48,9 +48,11 @@ struct mtk_ddp_comp_funcs { unsigned int bpc, struct cmdq_pkt *cmdq_pkt); void (*start)(struct device *dev); void (*stop)(struct device *dev); - void (*enable_vblank)(struct device *dev, - void (*vblank_cb)(void *), - void *vblank_cb_data); + void (*register_vblank_cb)(struct device *dev, + void (*vblank_cb)(void *), + void *vblank_cb_data); + void (*unregister_vblank_cb)(struct device *dev); + void (*enable_vblank)(struct device *dev); void (*disable_vblank)(struct device *dev); unsigned int (*supported_rotations)(struct device *dev); unsigned int (*layer_nr)(struct device *dev); @@ -111,12 +113,25 @@ static inline void mtk_ddp_comp_stop(struct mtk_ddp_comp *comp) comp->funcs->stop(comp->dev); } -static inline void mtk_ddp_comp_enable_vblank(struct mtk_ddp_comp *comp, - void (*vblank_cb)(void *), - void *vblank_cb_data) +static inline void mtk_ddp_comp_register_vblank_cb(struct mtk_ddp_comp *comp, + void (*vblank_cb)(void *), + void *vblank_cb_data) +{ + if (comp->funcs && comp->funcs->register_vblank_cb) + comp->funcs->register_vblank_cb(comp->dev, vblank_cb, + vblank_cb_data); +} + +static inline void mtk_ddp_comp_unregister_vblank_cb(struct mtk_ddp_comp *comp) +{ + if (comp->funcs && comp->funcs->unregister_vblank_cb) + comp->funcs->unregister_vblank_cb(comp->dev); +} + +static inline void mtk_ddp_comp_enable_vblank(struct mtk_ddp_comp *comp) { if (comp->funcs && comp->funcs->enable_vblank) - comp->funcs->enable_vblank(comp->dev, vblank_cb, vblank_cb_data); + comp->funcs->enable_vblank(comp->dev); } static inline void mtk_ddp_comp_disable_vblank(struct mtk_ddp_comp *comp) -- 2.35.1