linux-kernel - Re: [PATCH v16 2/8] phy: Add HDMI configuration options

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Message-ID: <5bn3qcbzyyudjh34y76jj2r5j2p7mzpig4xntmjjlneznoipjw@ca7sbco5ceyk>
Date: Sat, 21 Sep 2024 23:28:21 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sandor Yu <Sandor.yu@....com>, vkoul@...nel.org, mripard@...nel.org
Cc: andrzej.hajda@...el.com, neil.armstrong@...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, mripard@...nel.org, 
	kernel@...gutronix.de, linux-imx@....com, oliver.brown@....com, 
	alexander.stein@...tq-group.com, sam@...nborg.org
Subject: Re: [PATCH v16 2/8] phy: Add HDMI configuration options

On Tue, Jul 02, 2024 at 08:22:34PM GMT, 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>
> ---
> v15->v16:
> - Remove pixel_clk_rate, bpc and color_space fields from struct
>   phy_configure_opts_hdmi, they were replaced by unsigned long long tmds_char_rate.
> - Remove r-b and a-c tags because this patch have important change.
> 
> v9->v15:
>  *No change.
> 
>  include/linux/phy/phy-hdmi.h | 20 ++++++++++++++++++++
>  include/linux/phy/phy.h      |  7 ++++++-
>  2 files changed, 26 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..dd923e19d17c
> --- /dev/null
> +++ b/include/linux/phy/phy-hdmi.h
> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2022 NXP
> + */
> +
> +#ifndef __PHY_HDMI_H_
> +#define __PHY_HDMI_H_
> +
> +#include <linux/hdmi.h>

This header is not neccessary anymore. With it removed:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Maxime, is this patch fine with you?

Vinod, could you please pick up this patch for 6.13 and possibly provide
an immutable tag for it? I see drm drivers using bad workarounds because
we don't have this in the API yet.

> +/**
> + * struct phy_configure_opts_hdmi - HDMI configuration set
> + * @tmds_char_rate: HDMI TMDS Character Rate in Hertz.
> + *
> + * This structure is used to represent the configuration state of a HDMI phy.
> + */
> +struct phy_configure_opts_hdmi {
> +	unsigned long long tmds_char_rate;
> +};
> +
> +#endif /* __PHY_HDMI_H_ */
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index 03cd5bae92d3..4ac486b101fe 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
> 

-- 
With best wishes
Dmitry