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

[Sandor Yu <sandor.yu@nxp.com>]

> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Sent: 2023年7月10日 15:30
> To: Sandor Yu <sandor.yu@nxp.com>
> Cc: andrzej.hajda@intel.com; neil.armstrong@linaro.org;
> robert.foss@linaro.org; Laurent.pinchart@ideasonboard.com;
> jonas@kwiboo.se; jernej.skrabec@gmail.com; airlied@gmail.com;
> daniel@ffwll.ch; robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org;
> shawnguo@kernel.org; s.hauer@pengutronix.de; festevam@gmail.com;
> vkoul@kernel.org; dri-devel@lists.freedesktop.org;
> devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linux-kernel@vger.kernel.org; linux-phy@lists.infradead.org;
> kernel@pengutronix.de; dl-linux-imx <linux-imx@nxp.com>; Oliver Brown
> <oliver.brown@nxp.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@nxp.com> wrote:
> >
> > Hi Dmitry,
> >
> > Thanks for your comments,
> >
> > > -----Original Message-----
> > > From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> > > Sent: 2023年6月25日 2:02
> > > To: Sandor Yu <sandor.yu@nxp.com>; andrzej.hajda@intel.com;
> > > neil.armstrong@linaro.org; robert.foss@linaro.org;
> > > Laurent.pinchart@ideasonboard.com; jonas@kwiboo.se;
> > > jernej.skrabec@gmail.com; airlied@gmail.com; daniel@ffwll.ch;
> > > robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org;
> > > shawnguo@kernel.org; s.hauer@pengutronix.de; festevam@gmail.com;
> > > vkoul@kernel.org; dri-devel@lists.freedesktop.org;
> > > devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> > > linux-kernel@vger.kernel.org; linux-phy@lists.infradead.org
> > > Cc: kernel@pengutronix.de; dl-linux-imx <linux-imx@nxp.com>; Oliver
> > > Brown <oliver.brown@nxp.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@nxp.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