linux-kernel - RE: [EXT] Re: [PATCH v3 04/10] phy: Add HDMI configuration options

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Date:   Thu, 10 Nov 2022 08:09:53 +0000
From:   Sandor Yu <sandor.yu@....com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     "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>,
        "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>,
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        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
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        dl-linux-imx <linux-imx@....com>,
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        Oliver Brown <oliver.brown@....com>
Subject: RE: [EXT] Re: [PATCH v3 04/10] phy: Add HDMI configuration options

Thanks your comments,

> -----Original Message-----
> From: Vinod Koul <vkoul@...nel.org>
> Sent: 2022年11月10日 15:39
> To: Sandor Yu <sandor.yu@....com>
> Cc: 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; andrzej.hajda@...el.com;
> neil.armstrong@...aro.org; robert.foss@...aro.org;
> Laurent.pinchart@...asonboard.com; jonas@...boo.se;
> jernej.skrabec@...il.com; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>; tzimmermann@...e.de; lyude@...hat.com;
> javierm@...hat.com; ville.syrjala@...ux.intel.com; sam@...nborg.org;
> jani.nikula@...el.com; maxime@...no.tech;
> penguin-kernel@...ove.sakura.ne.jp; Oliver Brown <oliver.brown@....com>
> Subject: [EXT] Re: [PATCH v3 04/10] phy: Add HDMI configuration options
> 
> Caution: EXT Email
> 
> On 08-11-22, 21:00, 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.
> 
> Is there any dpendency b/w phy and hdmi, I dont see anything in cover..
> 
> Pls consider splitting the phy series ..
Both HDMI/DP and PHY patch set depend on each other to pass build.
HDMI driver depend on phy-hdmi.h and 
PHY driver depend on cdns-mhdp-mailbox.h to pass build.
The followed description had in cover patch:
"The patch set compose of DRM bridge drivers and PHY drivers.
Both of them need the followed two patches to pass build.
  drm: bridge: cadence: convert mailbox functions to macro functions
  phy: Add HDMI configuration options"

> 
> >
> > Signed-off-by: Sandor Yu <Sandor.yu@....com>
> > ---
> >  include/linux/phy/phy-hdmi.h | 33
> +++++++++++++++++++++++++++++++++
> >  include/linux/phy/phy.h      |  7 ++++++-
> >  2 files changed, 39 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..73a32eb535b0
> > --- /dev/null
> > +++ b/include/linux/phy/phy-hdmi.h
> > @@ -0,0 +1,33 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright 2022 NXP
> > + */
> > +
> > +#ifndef __PHY_HDMI_H_
> > +#define __PHY_HDMI_H_
> > +
> > +enum hdmi_phy_colorspace {
> > +     HDMI_PHY_COLORSPACE_RGB,
> > +     HDMI_PHY_COLORSPACE_YUV422,
> > +     HDMI_PHY_COLORSPACE_YUV444,
> > +     HDMI_PHY_COLORSPACE_YUV420,
> > +     HDMI_PHY_COLORSPACE_RESERVED4,
> > +     HDMI_PHY_COLORSPACE_RESERVED5,
> > +     HDMI_PHY_COLORSPACE_RESERVED6,
> > +};
> 
> kernel-doc style comments here too please
OK, I will add it.
> 
> > +
> > +/**
> > + * 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_ */
> > diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h index
> > b1413757fcc3..6f6873ea7270 100644
> > --- a/include/linux/phy/phy.h
> > +++ b/include/linux/phy/phy.h
> > @@ -17,6 +17,7 @@
> >  #include <linux/regulator/consumer.h>
> >
> >  #include <linux/phy/phy-dp.h>
> > +#include <linux/phy/phy-hdmi.h>
> >  #include <linux/phy/phy-lvds.h>
> >  #include <linux/phy/phy-mipi-dphy.h>
> >
> > @@ -42,7 +43,8 @@ enum phy_mode {
> >       PHY_MODE_MIPI_DPHY,
> >       PHY_MODE_SATA,
> >       PHY_MODE_LVDS,
> > -     PHY_MODE_DP
> > +     PHY_MODE_DP,
> > +     PHY_MODE_HDMI,
> >  };
> >
> >  enum phy_media {
> > @@ -60,11 +62,14 @@ enum phy_media {
> >   *           the DisplayPort protocol.
> >   * @lvds:    Configuration set applicable for phys supporting
> >   *           the LVDS phy mode.
> > + * @hdmi:    Configuration set applicable for phys supporting
> > + *           the HDMI phy mode.
> >   */
> >  union phy_configure_opts {
> >       struct phy_configure_opts_mipi_dphy     mipi_dphy;
> >       struct phy_configure_opts_dp            dp;
> >       struct phy_configure_opts_lvds          lvds;
> > +     struct phy_configure_opts_hdmi          hdmi;
> >  };
> >
> >  /**
> > --
> > 2.34.1
> 
> --
> ~Vinod

B.R
Sandor