linux-kernel - Re: [PATCH v5 08/12] phy: rockchip: samsung-hdptx: Setup TMDS char rate via phy_configure_opts

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Message-ID: <CAA8EJpoGu4Tq-wt09Jj+b+=eJ3dNXhPWVOg4DyCQxrJbFNFfYw@mail.gmail.com>
Date: Sun, 9 Mar 2025 11:26:32 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
	Heiko Stuebner <heiko@...ech.de>, Algea Cao <algea.cao@...k-chips.com>, 
	Sandor Yu <Sandor.yu@....com>, Maxime Ripard <mripard@...nel.org>, kernel@...labora.com, 
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v5 08/12] phy: rockchip: samsung-hdptx: Setup TMDS char
 rate via phy_configure_opts_hdmi

On Sat, 8 Mar 2025 at 14:21, Cristian Ciocaltea
<cristian.ciocaltea@...labora.com> wrote:
>
> The current workaround to setup the TMDS character rate relies on the
> unconventional usage of phy_set_bus_width().
>
> Make use of the recently introduced HDMI PHY configuration API to
> properly handle the setup.  The workaround will be dropped as soon as
> the switch has been completed on both ends.
>
> Rename rk_hdptx_phy_verify_config() to rk_hdptx_phy_verify_dp_config()
> and introduce the rk_hdptx_phy_verify_hdmi_config() helper to check the
> HDMI parameters during phy_configure().
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 64 +++++++++++++++++------
>  1 file changed, 47 insertions(+), 17 deletions(-)
>

> @@ -1469,8 +1474,27 @@ static int rk_hdptx_phy_power_off(struct phy *phy)
>         return rk_hdptx_phy_consumer_put(hdptx, false);
>  }
>
> -static int rk_hdptx_phy_verify_config(struct rk_hdptx_phy *hdptx,
> -                                     struct phy_configure_opts_dp *dp)
> +static int rk_hdptx_phy_verify_hdmi_config(struct rk_hdptx_phy *hdptx,
> +                                          struct phy_configure_opts_hdmi *hdmi)
> +{
> +       int i;
> +
> +       if (!hdmi->tmds_char_rate || hdmi->tmds_char_rate > HDMI20_MAX_RATE)
> +               return -EINVAL;
> +
> +       for (i = 0; i < ARRAY_SIZE(ropll_tmds_cfg); i++)
> +               if (hdmi->tmds_char_rate == ropll_tmds_cfg[i].rate)
> +                       break;

return 0;

> +
> +       if (i == ARRAY_SIZE(ropll_tmds_cfg) &&

Then you can drop the first clause in the if

> +           !rk_hdptx_phy_clk_pll_calc(hdmi->tmds_char_rate, NULL))
> +               return -EINVAL;
> +
> +       return 0;
> +}
> +
> +static int rk_hdptx_phy_verify_dp_config(struct rk_hdptx_phy *hdptx,
> +                                        struct phy_configure_opts_dp *dp)
>  {
>         int i;
>



-- 
With best wishes
Dmitry