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

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Date:   Mon, 10 Jul 2023 10:44:18 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Sandor Yu <sandor.yu@....com>,
        "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>
Cc:     "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 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?

> 
> 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