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Message-ID: <fef1cae9-057c-4946-b9d3-27a799fefc5d@collabora.com>
Date: Tue, 17 Oct 2023 11:54:44 +0200
From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
To: Hsiao Chien Sung <shawn.sung@...iatek.com>,
CK Hu <ck.hu@...iatek.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Rob Herring <robh+dt@...nel.org>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Fei Shao <fshao@...omium.org>,
Sean Paul <sean@...rly.run>,
Johnson Wang <johnson.wang@...iatek.corp-partner.google.com>,
"Nancy . Lin" <nancy.lin@...iatek.com>,
Moudy Ho <moudy.ho@...iatek.com>,
"Jason-JH . Lin" <jason-jh.lin@...iatek.com>,
Nathan Lu <nathan.lu@...iatek.com>,
Yongqiang Niu <yongqiang.niu@...iatek.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 22/23] drm/mediatek: Power on devices in OVL adaptor
when atomic enable
Il 16/10/23 12:40, Hsiao Chien Sung ha scritto:
> Different from OVL, OVL adaptor is a pseudo device so we didn't
> define it in the device tree, consequently, pm_runtime_resume_and_get()
> called by .atomic_enable() powers on no device in OVL adaptor and
> leads to power outage in the corresponding IOMMU.
>
> To resolve the issue, we implement a function to power on the RDMAs
> in OVL adaptor, and the system will make sure the IOMMU is powered on
> as well because of the device link (iommus) in the RDMA nodes in DTS.
>
> Fixes: 5db12f5d843b ("media: drm/mediatek: Add pm runtime support for ovl and rdma")
>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_drv.h | 4 ++
> .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 62 +++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 28 +++------
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 2 +
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 20 ++++++
> drivers/gpu/drm/mediatek/mtk_mdp_rdma.c | 16 +++++
> 6 files changed, 111 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index e2b602037ac3..c44f5b31bab5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -109,6 +109,8 @@ void mtk_ovl_adaptor_connect(struct device *dev, struct device *mmsys_dev,
> unsigned int next);
> void mtk_ovl_adaptor_disconnect(struct device *dev, struct device *mmsys_dev,
> unsigned int next);
> +int mtk_ovl_adaptor_power_on(struct device *dev);
> +void mtk_ovl_adaptor_power_off(struct device *dev);
> int mtk_ovl_adaptor_clk_enable(struct device *dev);
> void mtk_ovl_adaptor_clk_disable(struct device *dev);
> void mtk_ovl_adaptor_config(struct device *dev, unsigned int w,
> @@ -150,6 +152,8 @@ void mtk_rdma_disable_vblank(struct device *dev);
> const u32 *mtk_rdma_get_formats(struct device *dev);
> size_t mtk_rdma_get_num_formats(struct device *dev);
>
> +int mtk_mdp_rdma_power_on(struct device *dev);
> +void mtk_mdp_rdma_power_off(struct device *dev);
> int mtk_mdp_rdma_clk_enable(struct device *dev);
> void mtk_mdp_rdma_clk_disable(struct device *dev);
> void mtk_mdp_rdma_start(struct device *dev, struct cmdq_pkt *cmdq_pkt);
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> index b80425360e76..8de57a5f5518 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
> @@ -98,6 +98,8 @@ static const struct mtk_ddp_comp_funcs _padding = {
> };
>
> static const struct mtk_ddp_comp_funcs _rdma = {
> + .power_on = mtk_mdp_rdma_power_on,
> + .power_off = mtk_mdp_rdma_power_off,
> .clk_enable = mtk_mdp_rdma_clk_enable,
> .clk_disable = mtk_mdp_rdma_clk_disable,
> };
> @@ -241,6 +243,66 @@ void mtk_ovl_adaptor_stop(struct device *dev)
> }
> }
>
> +/**
> + * mtk_ovl_adaptor_power_on - Power on devices in OVL adaptor
> + * @dev: device to be powered on
> + *
> + * Different from OVL, OVL adaptor is a pseudo device so
> + * we didn't define it in the device tree, pm_runtime_resume_and_get()
> + * called by .atomic_enable() power on no device in OVL adaptor,
> + * we have to implement a function to do the job instead.
> + *
> + * returns:
> + * zero on success, errno on failures.
You're almost there! There's just one mistake making this invalid kerneldoc;
change to...
* Return: Zero for success or negative number for failure.
https://docs.kernel.org/doc-guide/kernel-doc.html
> + */
> +int mtk_ovl_adaptor_power_on(struct device *dev)
> +{
> + int i, ret;
> + struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
> +
> + for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
> + if (!ovl_adaptor->ovl_adaptor_comp[i] ||
> + !comp_matches[i].funcs->power_on)
> + continue;
> +
> + /*
> + * do not power on the devices that don't define
> + * .power_off() function
> + */
> + if (!comp_matches[i].funcs->power_off) {
> + dev_warn(dev, ".power_off() is undefined\n");
> + continue;
> + }
> +
> + ret = comp_matches[i].funcs->power_on(ovl_adaptor->ovl_adaptor_comp[i]);
> + if (ret < 0) {
> + mtk_ovl_adaptor_power_off(dev);
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> +/**
> + * mtk_ovl_adaptor_power_off - Power off devices in OVL adaptor
> + * @dev: device to be powered off
> + *
> + * call .power_off() function if defined
* Calls the .power_off() ovl_adaptor component callback if it is present.
> + */
Regards,
Angelo
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