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Date: Thu, 30 Sep 2021 11:28:12 +0800
From: Yong Wu <yong.wu@...iatek.com>
To: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Joerg Roedel <joro@...tes.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
David Airlie <airlied@...ux.ie>,
"Mauro Carvalho Chehab" <mchehab@...nel.org>
CC: Evan Green <evgreen@...omium.org>,
Robin Murphy <robin.murphy@....com>,
Tomasz Figa <tfiga@...omium.org>,
Will Deacon <will.deacon@....com>,
<linux-mediatek@...ts.infradead.org>,
<srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<iommu@...ts.linux-foundation.org>, <youlin.pei@...iatek.com>,
Matthias Kaehlcke <mka@...omium.org>, <anan.sun@...iatek.com>,
<yi.kuo@...iatek.com>, <acourbot@...omium.org>,
<linux-media@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
"Daniel Vetter" <daniel@...ll.ch>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
"Philipp Zabel" <p.zabel@...gutronix.de>,
Tiffany Lin <tiffany.lin@...iatek.com>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Eizan Miyamoto <eizan@...omium.org>,
<anthony.huang@...iatek.com>,
Frank Wunderlich <frank-w@...lic-files.de>,
Irui Wang <irui.wang@...iatek.com>
Subject: Re: [PATCH v8 09/12] media: mtk-vcodec: Get rid of
mtk_smi_larb_get/put
Hi Dafna,
Thanks very much for the review.
On Wed, 2021-09-29 at 14:13 +0200, Dafna Hirschfeld wrote:
>
> On 29.09.21 03:37, Yong Wu wrote:
> > MediaTek IOMMU has already added the device_link between the
> > consumer
> > and smi-larb device. If the vcodec device call the
> > pm_runtime_get_sync,
> > the smi-larb's pm_runtime_get_sync also be called automatically.
> >
> > CC: Tiffany Lin <tiffany.lin@...iatek.com>
> > CC: Irui Wang <irui.wang@...iatek.com>
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > Reviewed-by: Evan Green <evgreen@...omium.org>
> > Acked-by: Tiffany Lin <tiffany.lin@...iatek.com>
> > Reviewed-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
> > ---
> > .../platform/mtk-vcodec/mtk_vcodec_dec_pm.c | 37 +++-----------
> > --
> > .../platform/mtk-vcodec/mtk_vcodec_drv.h | 3 --
> > .../platform/mtk-vcodec/mtk_vcodec_enc.c | 1 -
> > .../platform/mtk-vcodec/mtk_vcodec_enc_pm.c | 44 +++-----------
> > -----
> > 4 files changed, 10 insertions(+), 75 deletions(-)
> >
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > index 6038db96f71c..d0bf9aa3b29d 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > @@ -8,14 +8,12 @@
> > #include <linux/of_address.h>
> > #include <linux/of_platform.h>
> > #include <linux/pm_runtime.h>
> > -#include <soc/mediatek/smi.h>
> >
> > #include "mtk_vcodec_dec_pm.h"
> > #include "mtk_vcodec_util.h"
> >
> > int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *mtkdev)
> > {
> > - struct device_node *node;
> > struct platform_device *pdev;
> > struct mtk_vcodec_pm *pm;
> > struct mtk_vcodec_clk *dec_clk;
> > @@ -26,18 +24,7 @@ int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev
> > *mtkdev)
> > pm = &mtkdev->pm;
> > pm->mtkdev = mtkdev;
> > dec_clk = &pm->vdec_clk;
> > - node = of_parse_phandle(pdev->dev.of_node, "mediatek,larb", 0);
> > - if (!node) {
> > - mtk_v4l2_err("of_parse_phandle mediatek,larb fail!");
> > - return -1;
> > - }
> >
> > - pdev = of_find_device_by_node(node);
> > - of_node_put(node);
> > - if (WARN_ON(!pdev)) {
> > - return -1;
> > - }
> > - pm->larbvdec = &pdev->dev;
> > pdev = mtkdev->plat_dev;
> > pm->dev = &pdev->dev;
> >
> > @@ -47,14 +34,11 @@ int mtk_vcodec_init_dec_pm(struct
> > mtk_vcodec_dev *mtkdev)
> > dec_clk->clk_info = devm_kcalloc(&pdev->dev,
> > dec_clk->clk_num, sizeof(*clk_info),
> > GFP_KERNEL);
> > - if (!dec_clk->clk_info) {
> > - ret = -ENOMEM;
> > - goto put_device;
> > - }
> > + if (!dec_clk->clk_info)
> > + return -ENOMEM;
> > } else {
> > mtk_v4l2_err("Failed to get vdec clock count");
> > - ret = -EINVAL;
> > - goto put_device;
> > + return -EINVAL;
> > }
> >
> > for (i = 0; i < dec_clk->clk_num; i++) {
> > @@ -63,29 +47,24 @@ int mtk_vcodec_init_dec_pm(struct
> > mtk_vcodec_dev *mtkdev)
> > "clock-names", i, &clk_info->clk_name);
> > if (ret) {
> > mtk_v4l2_err("Failed to get clock name id =
> > %d", i);
> > - goto put_device;
> > + return ret;
> > }
> > clk_info->vcodec_clk = devm_clk_get(&pdev->dev,
> > clk_info->clk_name);
> > if (IS_ERR(clk_info->vcodec_clk)) {
> > mtk_v4l2_err("devm_clk_get (%d)%s fail", i,
> > clk_info->clk_name);
> > - ret = PTR_ERR(clk_info->vcodec_clk);
> > - goto put_device;
> > + return PTR_ERR(clk_info->vcodec_clk);
> > }
> > }
> >
> > pm_runtime_enable(&pdev->dev);
> > return 0;
> > -put_device:
> > - put_device(pm->larbvdec);
> > - return ret;
> > }
> >
> > void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev)
> > {
> > pm_runtime_disable(dev->pm.dev);
> > - put_device(dev->pm.larbvdec);
> > }
>
> Now that functions only do 'pm_runtime_disable(dev->pm.dev);' so it
> will be more
> readable to remove the function mtk_vcodec_release_dec_pm
> and replace with pm_runtime_disable(dev->pm.dev);
> Same for the 'enc' equivalent.
Make sense. But It may be not proper if using pm_runtime_disable
as the symmetry with mtk_vcodec_init_dec_pm in the mtk_vcodec_probe.
Maybe we should move pm_runtime_enable out from mtk_vcodec_init_dec_pm
into mtk_vcodec_probe. I could do a new patch for this. Is this ok for
you?
>
> Thanks,
> Dafna
[snip]
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