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Thu, 22 Apr 2021 22:59:10 -0700 (PDT) From: Eizan Miyamoto To: linux-kernel@vger.kernel.org Cc: enric.balletbo@collabora.com, chunkuang.hu@kernel.org, yong.wu@mediatek.com, Eizan Miyamoto , Andrew-CT Chen , Houlong Wei , Matthias Brugger , Mauro Carvalho Chehab , Minghsiu Tsai , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org Subject: [PATCH v1 3/4] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on Date: Fri, 23 Apr 2021 15:58:40 +1000 Message-Id: <20210423155824.v1.3.Ifd87681955689a08cce4c65e72ee5e8c6d09af95@changeid> X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-goog In-Reply-To: <20210423055842.2490679-1-eizan@chromium.org> References: <20210423055842.2490679-1-eizan@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210423_070021_819528_C207B6DB X-CRM114-Status: GOOD ( 24.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The original intent of commit 86698b9505bbc ("media: mtk-mdp: convert mtk_mdp_dev.comp array to list") was to create a list to track all the MDP components that needed to have their clocks enabled/disabled when calling mtk_mdp_comp_clock_on/off. However, there was a bug inside mtk_mdp_register_component where the args to a call to list_add were swapped. The result is that only one component was added to mtk_mdp_dev.comp_list because comp_list was instead being repeatedly added to the single element lists headed by each mtk_mdp_comp. The order of the args to list_add in mtk_mdp_register_component was fixed in https://patchwork.kernel.org/patch/11742895/ (Fix Null pointer dereference when calling list_add). Then, as a result of https://patchwork.kernel.org/patch/11530769/ (mtk-mdp: use pm_runtime in MDP component driver) if all the components are added to the component list, the mdp "master" / rdma0 component ends up having pm_runtime_get_sync() called on it twice recursively: rpm_resume+0x694/0x8f8 __pm_runtime_resume+0x7c/0xa0 ***NOTE*** mtk_mdp_comp_clock_on+0x48/0x104 [mtk_mdp] mtk_mdp_pm_resume+0x2c/0x44 [mtk_mdp] pm_generic_runtime_resume+0x34/0x48 __genpd_runtime_resume+0x6c/0x80 genpd_runtime_resume+0x104/0x1ac __rpm_callback+0x120/0x238 rpm_callback+0x34/0x8c rpm_resume+0x7a0/0x8f8 __pm_runtime_resume+0x7c/0xa0 ***NOTE*** mtk_mdp_m2m_start_streaming+0x2c/0x3c [mtk_mdp] (The calls to pm_runtime_get_sync are inlined and correspond to the calls to __pm_runtime_resume). It is not correct to have pm_runtime_get_sync called recursively and the second call will block indefinitely. As a result of all that, this change factors mtk_mdp_comp_clock_on/off into mtk_mdp_comp_power_on/off and moves the calls to pm_runtime_get/put into the power_on/off functions. This change then special-cases the master/rdma0 MDP component and does these things: - the master/rdma0 component is not added to mtk_mdp_dev.comp_list - the master/rdma0 component has its clocks (*but not power*) toggled by mtk_mpd_comp_clock_on/off inside mtk_mdp_clock_on/off. - the other components have their clocks *and* power toggled with mtk_mdp_comp_power_on/off. This change introduces the assumption that mtk_mdp_pm_resume will always be called though a callback from pm_runtime_get_sync made on the master / rdma0 component. Signed-off-by: Eizan Miyamoto --- drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 28 ++++++++++++++----- drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 3 ++ drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 23 ++++++++++----- 3 files changed, 40 insertions(+), 14 deletions(-) diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c index 84f9c529d74a..d447bfaadef4 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c @@ -53,15 +53,31 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = { }; MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match); -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) +void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp) { - int i, err; + int err; err = pm_runtime_get_sync(comp->dev); if (err < 0) - dev_err(comp->dev, - "failed to runtime get, err %d.\n", - err); + dev_err(comp->dev, "failed to runtime get, err %d.\n", err); + + mtk_mdp_comp_clock_on(comp); +} + +void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp) +{ + int err; + + mtk_mdp_comp_clock_off(comp); + + err = pm_runtime_put_sync(comp->dev); + if (err < 0) + dev_err(comp->dev, "failed to runtime put, err %d.\n", err); +} + +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) +{ + int i, err; for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { if (IS_ERR(comp->clk[i])) @@ -83,8 +99,6 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp) continue; clk_disable_unprepare(comp->clk[i]); } - - pm_runtime_put_sync(comp->dev); } static int mtk_mdp_comp_bind(struct device *dev, struct device *master, diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h index 355e226d74fe..7ad9b06bb11b 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h @@ -21,6 +21,9 @@ struct mtk_mdp_comp { int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev); +void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp); +void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp); + void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp); void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp); diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c index c55bcfe4cbb7..5e71496e2517 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c @@ -53,8 +53,15 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) { struct mtk_mdp_comp *comp_node; + /* + * The master / rdma0 component will have pm_runtime_get_sync called + * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to + * have mtk_mdp_comp_power_on called on it. + */ + mtk_mdp_comp_clock_on(&mdp->comp_self); + list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_clock_on(comp_node); + mtk_mdp_comp_power_on(comp_node); } static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) @@ -62,7 +69,14 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) struct mtk_mdp_comp *comp_node; list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_clock_off(comp_node); + mtk_mdp_comp_power_off(comp_node); + + /* + * The master / rdma0 component will have pm_runtime_put called + * on it through mtk_mdp_m2m_stop_streaming, making it unnecessary to + * have mtk_mdp_comp_power_off called on it. + */ + mtk_mdp_comp_clock_off(&mdp->comp_self); } static void mtk_mdp_wdt_worker(struct work_struct *work) @@ -101,8 +115,6 @@ static int mtk_mdp_master_bind(struct device *dev) int status; struct mtk_mdp_dev *mdp = dev_get_drvdata(dev); - mtk_mdp_register_component(mdp, &mdp->comp_self); - status = component_bind_all(dev, mdp); if (status) { dev_err(dev, "Failed to bind all components: %d\n", status); @@ -124,8 +136,6 @@ static int mtk_mdp_master_bind(struct device *dev) component_unbind_all(dev, mdp); err_component_bind_all: - mtk_mdp_unregister_component(mdp, &mdp->comp_self); - return status; } @@ -136,7 +146,6 @@ static void mtk_mdp_master_unbind(struct device *dev) pm_runtime_disable(dev); mtk_mdp_unregister_m2m_device(mdp); component_unbind_all(dev, mdp); - mtk_mdp_unregister_component(mdp, &mdp->comp_self); } static const struct component_master_ops mtk_mdp_com_ops = {