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Date: Tue, 3 Aug 2021 12:26:59 +0200
From: Enric Balletbo Serra <eballetbo@...il.com>
To: Eizan Miyamoto <eizan@...omium.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
Chen-Yu Tsai <wenst@...omium.org>,
Houlong Wei <houlong.wei@...iatek.com>,
Yong Wu <yong.wu@...iatek.com>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
devicetree <devicetree@...r.kernel.org>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Media Mailing List <linux-media@...r.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v6 1/9] mtk-mdp: propagate errors from clock_on
Hi Eizan,
Thank you for your patch.
Missatge de Eizan Miyamoto <eizan@...omium.org> del dia dl., 2 d’ag.
2021 a les 14:13:
>
> Up until this change, many errors were logged but ignored when powering
> on clocks inside mtk_mdp_core. This change tries to do a better job at
> propagating errors back to the power management framework.
>
> Signed-off-by: Eizan Miyamoto <eizan@...omium.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>
> (no changes since v1)
>
> drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 25 ++++++++++++-----
> drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 2 +-
> drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 27 ++++++++++++++-----
> 3 files changed, 39 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> index b3426a551bea..76e295c8d9bc 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
> @@ -13,10 +13,9 @@
>
> #include "mtk_mdp_comp.h"
>
> -
> -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
> +int mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
> {
> - int i, err;
> + int i, err, status;
>
> if (comp->larb_dev) {
> err = mtk_smi_larb_get(comp->larb_dev);
> @@ -30,11 +29,23 @@ void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
> 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. type:%d i:%d\n",
> - err, comp->type, i);
> + if (err) {
> + status = err;
> + dev_err(dev, "failed to enable clock, err %d. i:%d\n", err, i);
> + goto err_clk_prepare_enable;
> + }
> + }
> +
> + return 0;
> +
> +err_clk_prepare_enable:
> + for (--i; i >= 0; i--) {
> + if (IS_ERR(comp->clk[i]))
> + continue;
> + clk_disable_unprepare(comp->clk[i]);
nit: We could use bulk functions here, but that's probably a follow-up patch.
> }
> +
> + return status;
> }
>
> void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> index 7897766c96bb..92ab5249bcad 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h
> @@ -41,7 +41,7 @@ int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
> struct mtk_mdp_comp *comp,
> enum mtk_mdp_comp_type comp_type);
> void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp);
> -void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
> +int 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);
>
>
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index 976aa1f4829b..412bbec0f735 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -52,13 +52,28 @@ static const struct of_device_id mtk_mdp_of_ids[] = {
> };
> MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
>
> -static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
> +static int mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
> {
> - struct device *dev = &mdp->pdev->dev;
> struct mtk_mdp_comp *comp_node;
> + int status;
> + struct device *dev = &mdp->pdev->dev;
> + int err;
>
> - list_for_each_entry(comp_node, &mdp->comp_list, node)
> - mtk_mdp_comp_clock_on(dev, comp_node);
> + list_for_each_entry(comp_node, &mdp->comp_list, node) {
> + err = mtk_mdp_comp_clock_on(dev, comp_node);
> + if (err) {
> + status = err;
> + goto err_mtk_mdp_comp_clock_on;
> + }
> + }
> +
> + return 0;
> +
> +err_mtk_mdp_comp_clock_on:
> + list_for_each_entry_continue_reverse(comp_node, &mdp->comp_list, node)
> + mtk_mdp_comp_clock_off(dev, comp_node);
> +
> + return status;
> }
>
> static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
> @@ -274,9 +289,7 @@ static int __maybe_unused mtk_mdp_pm_resume(struct device *dev)
> {
> struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
>
> - mtk_mdp_clock_on(mdp);
> -
> - return 0;
> + return mtk_mdp_clock_on(mdp);
> }
>
> static int __maybe_unused mtk_mdp_suspend(struct device *dev)
> --
> 2.32.0.554.ge1b32706d8-goog
>
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