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[23.128.96.18]) by mx.google.com with ESMTP id s18si13400968jao.15.2021.07.12.04.04.41; Mon, 12 Jul 2021 04:05:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=collabora.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238685AbhGLKPF (ORCPT + 99 others); Mon, 12 Jul 2021 06:15:05 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:51718 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234631AbhGLKO6 (ORCPT ); Mon, 12 Jul 2021 06:14:58 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id BD3991F4210D From: Enric Balletbo i Serra Subject: Re: [PATCH v5 2/8] mtk-mdp: use pm_runtime in MDP component driver To: Eizan Miyamoto , linux-kernel@vger.kernel.org Cc: wenst@chromium.org, chunkuang.hu@kernel.org, yong.wu@mediatek.com, houlong.wei@mediatek.com, Andrew-CT Chen , Matthias Brugger , Mauro Carvalho Chehab , Minghsiu Tsai , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org References: <20210709022324.1607884-1-eizan@chromium.org> <20210709122040.v5.2.I909f5375d930f5d0cc877128e30e2a67078b674c@changeid> Message-ID: <7159c4e3-1059-7813-30a3-51027488442b@collabora.com> Date: Mon, 12 Jul 2021 12:12:03 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210709122040.v5.2.I909f5375d930f5d0cc877128e30e2a67078b674c@changeid> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Eizan, Thank you for your patch. On 9/7/21 4:23, Eizan Miyamoto wrote: > Without this change, the MDP components are not fully integrated into > the runtime power management subsystem, and the MDP driver does not > work. > > For each of the component device drivers to be able to call > pm_runtime_get/put_sync() a pointer to the component's device struct > had to be added to struct mtk_mdp_comp, set by mtk_mdp_comp_init(). > > Note that the dev argument to mtk_mdp_comp_clock_on/off() has been > removed. Those functions used to be called from the "master" mdp driver > in mtk_mdp_core.c, but the component's device pointer no longer > corresponds to the mdp master device pointer, which is not the right > device to pass to pm_runtime_put/get_sync() which we had to add to get > the driver to work properly. > > Signed-off-by: Eizan Miyamoto > --- > > (no changes since v1) > > drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 20 ++++++++++++++----- > drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 8 +++++--- > drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 6 ++---- > 3 files changed, 22 insertions(+), 12 deletions(-) > > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c > index aec1cb5c4261..8b6158379f41 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > > #include "mtk_mdp_comp.h" > #include "mtk_mdp_core.h" > @@ -52,7 +53,7 @@ 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 device *dev, struct mtk_mdp_comp *comp) > +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) > { > int i, err; > > @@ -63,18 +64,22 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp) > "failed to get larb, err %d.\n", err); > } > > + err = pm_runtime_get_sync(comp->dev); > + if (err < 0) The pm_runtime_get_sync increases the device usage counter so, if it fails you should decrease the usage with put. Ok I see that put is called in off. I don't really like how the error handling of all this is done, but also I think is not your problem, it was also a problem before this patch. > + dev_err(comp->dev, > + "failed to runtime get, err %d.\n", > + err); > + Printing errors and not returning errors is bad design for me. But this is a void function, so ... > for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { > if (IS_ERR(comp->clk[i])) > continue; > err = clk_prepare_enable(comp->clk[i]); > if (err) > - dev_err(dev, > - "failed to enable clock, err %d. i:%d\n", > - err, i); > + dev_err(comp->dev, "failed to enable clock, err %d. i:%d\n", err, i); I think that if clock fails to be enabled it will already print an error, so this print is duplicated. > } > } > > -void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp) > +void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp) > { > int i; > > @@ -86,6 +91,8 @@ void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp) > > if (comp->larb_dev) > mtk_smi_larb_put(comp->larb_dev); > + > + pm_runtime_put_sync(comp->dev); > } > > static int mtk_mdp_comp_bind(struct device *dev, struct device *master, > @@ -95,6 +102,7 @@ static int mtk_mdp_comp_bind(struct device *dev, struct device *master, > struct mtk_mdp_dev *mdp = data; > > mtk_mdp_register_component(mdp, comp); > + pm_runtime_enable(dev); > > return 0; > } > @@ -105,6 +113,7 @@ static void mtk_mdp_comp_unbind(struct device *dev, struct device *master, > struct mtk_mdp_dev *mdp = data; > struct mtk_mdp_comp *comp = dev_get_drvdata(dev); > > + pm_runtime_disable(dev); > mtk_mdp_unregister_component(mdp, comp); > } > > @@ -124,6 +133,7 @@ int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev) > (enum mtk_mdp_comp_type)of_device_get_match_data(dev); > > INIT_LIST_HEAD(&comp->node); > + comp->dev = dev; > > for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { > comp->clk[i] = of_clk_get(node, i); > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h > index b5a18fe567aa..5e2ee94a1b37 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h > @@ -12,17 +12,19 @@ > * @node: list node to track sibing MDP components > * @clk: clocks required for component > * @larb_dev: SMI device required for component > + * @dev: component's device > */ > struct mtk_mdp_comp { > struct list_head node; > struct clk *clk[2]; > - struct device *larb_dev; > + struct device *larb_dev; This change is unrelated to this patch. > + struct device *dev; > }; > > int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev); > > -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp); > -void mtk_mdp_comp_clock_off(struct device *dev, 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); > > extern struct platform_driver mtk_mdp_component_driver; > > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > index aca236dbd348..78c40a61df1d 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > @@ -52,20 +52,18 @@ MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids); > > static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) > { > - struct device *dev = &mdp->pdev->dev; > struct mtk_mdp_comp *comp_node; > > list_for_each_entry(comp_node, &mdp->comp_list, node) > - mtk_mdp_comp_clock_on(dev, comp_node); > + mtk_mdp_comp_clock_on(comp_node); > } > > static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) > { > - struct device *dev = &mdp->pdev->dev; > struct mtk_mdp_comp *comp_node; > > list_for_each_entry(comp_node, &mdp->comp_list, node) > - mtk_mdp_comp_clock_off(dev, comp_node); > + mtk_mdp_comp_clock_off(comp_node); > } > > static void mtk_mdp_wdt_worker(struct work_struct *work) >