linux-kernel - Re: [PATCH v2 14/15] drm/mediatek: mtk_hdmi_common: Add OP

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Message-ID: <bbbfd8df7673b170ceb24a22238230dc2b35b0f2.camel@mediatek.com>
Date: Tue, 10 Dec 2024 01:22:49 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "robh@...nel.org" <robh@...nel.org>, "jie.qiu@...iatek.com"
	<jie.qiu@...iatek.com>, "kernel@...labora.com" <kernel@...labora.com>,
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	<mripard@...nel.org>, "tzimmermann@...e.de" <tzimmermann@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
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	<p.zabel@...gutronix.de>, Jitao Shi (石记涛)
	<jitao.shi@...iatek.com>, "airlied@...il.com" <airlied@...il.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "junzhi.zhao@...iatek.com"
	<junzhi.zhao@...iatek.com>
Subject: Re: [PATCH v2 14/15] drm/mediatek: mtk_hdmi_common: Add OP_HDMI,
 vendor and product strings

On Mon, 2024-12-09 at 10:56 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> Il 09/12/24 10:09, CK Hu (胡俊光) ha scritto:
> > Hi, Angelo:
> > 
> > On Thu, 2024-12-05 at 12:45 +0100, AngeloGioacchino Del Regno wrote:
> > > External email : Please do not click links or open attachments until you have verified the sender or the content.
> > > 
> > > 
> > > In preparation for adding the HDMI TX v2 driver, and to allow
> > > a future modernization of the HDMI v1 one, perform changes
> > > that enable the usage of the HDMI Helpers provided by DRM.
> > > 
> > > Check if the HDMI driver provides the function pointers to
> > > hdmi_{clear,write}_infoframe used by the HDMI Helper API and,
> > > if present, add DRM_BRIDGE_OP_HDMI to the drm_bridge ops,
> > > enabling the drm API to register the bridge as HDMI and to use
> > > the HDMI Helper functions.
> > > 
> > > Moreover, as part of data exclusively used (in the context of
> > > HDMI bridges) by the helpers, assign the vendor "MediaTek" and
> > > product "On-Chip HDMI" strings to the drm_bridge struct.
> > > 
> > > If the hdmi_{write,clear}_infoframe pointers are not assigned,
> > > vendor and product strings and HDMI helpers will not be used,
> > > hence this commit brings no functional changes to drivers that
> > > have not been refactored to use the new helpers.
> > > 
> > > This also means that, in the current state, there is effectively
> > > no functional change to mtk_hdmi and its other components.
> > 
> > OP_HDMI is for v2.
> > vendor and product strings is for both v1 and v2.
> > So separate this patch to two patches.
> > 
> 
> They're both for v2, because only v2 uses the HDMI helpers, while v1 does not.

Sorry, these two is required by DRM_BRIDGE_OP_HDMI.

  /**
         * @vendor: Vendor of the product to be used for the SPD InfoFrame
         * generation. This is required if @DRM_BRIDGE_OP_HDMI is set.
         */
        const char *vendor;
 
        /**
         * @product: Name of the product to be used for the SPD InfoFrame
         * generation. This is required if @DRM_BRIDGE_OP_HDMI is set.
         */
        const char *product;

So,

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> 
> Cheers,
> Angelo
> 
> > Regards,
> > CK
> > 
> > > 
> > > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> > > ---
> > >   drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 7 +++++++
> > >   1 file changed, 7 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> > > index 4f708b04f5e8..0f60842462b0 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
> > > @@ -408,9 +408,16 @@ struct mtk_hdmi *mtk_hdmi_common_probe(struct platform_device *pdev)
> > > 
> > >          hdmi->bridge.funcs = ver_conf->bridge_funcs;
> > >          hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
> > > +
> > > +       if (ver_conf->bridge_funcs->hdmi_write_infoframe &&
> > > +           ver_conf->bridge_funcs->hdmi_clear_infoframe)
> > > +               hdmi->bridge.ops |= DRM_BRIDGE_OP_HDMI;
> > > +
> > >          hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
> > >          hdmi->bridge.of_node = pdev->dev.of_node;
> > >          hdmi->bridge.ddc = hdmi->ddc_adpt;
> > > +       hdmi->bridge.vendor = "MediaTek";
> > > +       hdmi->bridge.product = "On-Chip HDMI";
> > > 
> > >          ret = devm_drm_bridge_add(dev, &hdmi->bridge);
> > >          if (ret)
> > > --
> > > 2.47.0
> > > 
> > 
> 
>