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Message-ID: <CAA8EJppbbeZB-pdPdg+gft+kS8Pzsxvqd9v6DsRNwTkL71XSJQ@mail.gmail.com>
Date: Mon, 10 Jul 2023 11:05:43 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sandor Yu <sandor.yu@....com>
Cc: "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>,
"neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
"robert.foss@...aro.org" <robert.foss@...aro.org>,
"Laurent.pinchart@...asonboard.com"
<Laurent.pinchart@...asonboard.com>,
"jonas@...boo.se" <jonas@...boo.se>,
"jernej.skrabec@...il.com" <jernej.skrabec@...il.com>,
"airlied@...il.com" <airlied@...il.com>,
"daniel@...ll.ch" <daniel@...ll.ch>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
"vkoul@...nel.org" <vkoul@...nel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
dl-linux-imx <linux-imx@....com>,
Oliver Brown <oliver.brown@....com>
Subject: Re: [EXT] Re: [PATCH v6 4/8] phy: Add HDMI configuration options
On Mon, 10 Jul 2023 at 11:01, Sandor Yu <sandor.yu@....com> wrote:
>
>
>
> > -----Original Message-----
> > From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > Sent: 2023年7月10日 15:44
> > To: Sandor Yu <sandor.yu@....com>; andrzej.hajda@...el.com;
> > neil.armstrong@...aro.org; robert.foss@...aro.org;
> > Laurent.pinchart@...asonboard.com; jonas@...boo.se;
> > jernej.skrabec@...il.com; airlied@...il.com; daniel@...ll.ch;
> > robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> > shawnguo@...nel.org; s.hauer@...gutronix.de; festevam@...il.com;
> > vkoul@...nel.org; dri-devel@...ts.freedesktop.org;
> > devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> > linux-kernel@...r.kernel.org; linux-phy@...ts.infradead.org
> > Cc: kernel@...gutronix.de; dl-linux-imx <linux-imx@....com>; Oliver Brown
> > <oliver.brown@....com>
> > Subject: Re: [EXT] Re: [PATCH v6 4/8] phy: Add HDMI configuration options
> >
> >
> > On 10/07/2023 10:28, Sandor Yu wrote:
> > > Hi Dmitry,
> > >
> > > Thanks for your comments,
> > >
> > >> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org> On 15/06/2023
> > >> 04:38, Sandor Yu wrote:
> > >>> Allow HDMI PHYs to be configured through the generic functions
> > >>> through a custom structure added to the generic union.
> > >>>
> > >>> The parameters added here are based on HDMI PHY implementation
> > >>> practices. The current set of parameters should cover the potential
> > >>> users.
> > >>>
> > >>> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> > >>> ---
> > >>> include/linux/phy/phy-hdmi.h | 38
> > >> ++++++++++++++++++++++++++++++++++++
> > >>> include/linux/phy/phy.h | 7 ++++++-
> > >>> 2 files changed, 44 insertions(+), 1 deletion(-)
> > >>> create mode 100644 include/linux/phy/phy-hdmi.h
> > >>>
> > >>> diff --git a/include/linux/phy/phy-hdmi.h
> > >>> b/include/linux/phy/phy-hdmi.h new file mode 100644 index
> > >>> 000000000000..5765aa5bc175
> > >>> --- /dev/null
> > >>> +++ b/include/linux/phy/phy-hdmi.h
> > >>> @@ -0,0 +1,38 @@
> > >>> +/* SPDX-License-Identifier: GPL-2.0 */
> > >>> +/*
> > >>> + * Copyright 2022 NXP
> > >>> + */
> > >>> +
> > >>> +#ifndef __PHY_HDMI_H_
> > >>> +#define __PHY_HDMI_H_
> > >>> +
> > >>> +/**
> > >>> + * Pixel Encoding as HDMI Specification
> > >>> + * RGB, YUV422, YUV444:HDMI Specification 1.4a Section 6.5
> > >>> + * YUV420: HDMI Specification 2.a Section 7.1 */ enum
> > >>> +hdmi_phy_colorspace {
> > >>> + HDMI_PHY_COLORSPACE_RGB, /* RGB 4:4:4 */
> > >>> + HDMI_PHY_COLORSPACE_YUV422, /* YCbCr 4:2:2 */
> > >>> + HDMI_PHY_COLORSPACE_YUV444, /* YCbCr 4:4:4 */
> > >>> + HDMI_PHY_COLORSPACE_YUV420, /* YCbCr 4:2:0 */
> > >>> + HDMI_PHY_COLORSPACE_RESERVED4,
> > >>> + HDMI_PHY_COLORSPACE_RESERVED5,
> > >>> + HDMI_PHY_COLORSPACE_RESERVED6, };
> > >>
> > >> This enum duplicates enum hdmi_colorspace from <linux/hdmi.h> HDMI
> > >> 2.0 defines '7' to be IDO-defined.
> > >>
> > >> Would it be better to use that enum instead?
> > > Accept. I will create head file hdmi_colorspace.h to reuse enum
> > hdmi_colorspace in <linux/hdmi.h>.
> >
> > Excuse me, it was supposed to be a question.
> >
> > Do you need another header file to reuse this enum?
> I'm not sure community whether would accept the patch that simply include <linux/hdmi.h> in phy-hdmi.h
> because there are lots of other definition in <linux/hdmi.h> that not need by phy-hdmi.h.
> If the answer is yes, I happy to follow.
In my opinion it's a better alternative to creating yet another header.
>
> >
> > >
> > > B.R
> > > Sandor
> > >>
> > >>> +
> > >>> +/**
> > >>> + * struct phy_configure_opts_hdmi - HDMI configuration set
> > >>> + * @pixel_clk_rate: Pixel clock of video modes in KHz.
> > >>> + * @bpc: Maximum bits per color channel.
> > >>> + * @color_space: Colorspace in enum hdmi_phy_colorspace.
> > >>> + *
> > >>> + * This structure is used to represent the configuration state of a HDMI
> > phy.
> > >>> + */
> > >>> +struct phy_configure_opts_hdmi {
> > >>> + unsigned int pixel_clk_rate;
> > >>> + unsigned int bpc;
> > >>> + enum hdmi_phy_colorspace color_space; };
> > >>> +
> > >>> +#endif /* __PHY_HDMI_H_ */
> > >>
> > >> [skipped the rest]
> > >>
> > >> --
> > >> With best wishes
> > >> Dmitry
> > >
> >
> > --
> > With best wishes
> > Dmitry
>
> B.R
> Sandor
>
--
With best wishes
Dmitry
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