linux-kernel - RE: [EXT] Re: [PATCH v6 4/8] phy: Add HDMI configuration options

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Date:   Mon, 10 Jul 2023 07:41:52 +0000
From:   Sandor Yu <sandor.yu@....com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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



> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Sent: 2023年7月10日 15:30
> To: Sandor Yu <sandor.yu@....com>
> Cc: 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;
> 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 10:28, Sandor Yu <sandor.yu@....com> wrote:
> >
> > Hi Dmitry,
> >
> > Thanks for your comments,
> >
> > > -----Original Message-----
> > > From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > > Sent: 2023年6月25日 2:02
> > > 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: [EXT] Re: [PATCH v6 4/8] phy: Add HDMI configuration
> > > options
> 
> Is this part necessary?
No, forgot to remove the Caution it is auto added by mail system.
> 
> > >
> > > Caution: This is an external email. Please take care when clicking
> > > links or opening attachments. When in doubt, report the message
> > > using the 'Report this email' button
> > >
> > >
> > > 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>.
> 
> Hmm, you need another header file to reuse this enum.
> 
> >
> > 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