linux-kernel - Re: [PATCH 4/4] phy: phy-rockchip-samsung-hdptx: Add clock provider support

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Date: Tue, 18 Jun 2024 09:55:12 +0200
From: Heiko Stübner <heiko@...ech.de>
To: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Algea Cao <algea.cao@...k-chips.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc: kernel@...labora.com, linux-phy@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject:
 Re: [PATCH 4/4] phy: phy-rockchip-samsung-hdptx: Add clock provider support

Am Montag, 17. Juni 2024, 23:48:12 CEST schrieb Cristian Ciocaltea:
> The HDMI PHY PLL can be used as an alternative dclk source to RK3588 SoC
> CRU. It provides more accurate clock rates required by VOP2 to improve
> existing support for display modes handling, which is known to be
> problematic when dealing with non-integer refresh rates, among others.
> 
> It is worth noting this only works for HDMI 2.0 or below, e.g. cannot be
> used to support HDMI 2.1 4K@...Hz mode.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 189 +++++++++++++++++++---
>  1 file changed, 167 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> index 72de287282eb..ad3fd4084377 100644
> --- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> +++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c

>  static int rk_hdptx_phy_power_on(struct phy *phy)
>  {
>  	struct rk_hdptx_phy *hdptx = phy_get_drvdata(phy);
>  	int bus_width = phy_get_bus_width(hdptx->phy);
> +	int ret;
> +
>  	/*
>  	 * FIXME: Temporary workaround to pass pixel_clk_rate
>  	 * from the HDMI bridge driver until phy_configure_opts_hdmi
> @@ -871,20 +925,18 @@ static int rk_hdptx_phy_power_on(struct phy *phy)
>  	dev_dbg(hdptx->dev, "%s bus_width=%x rate=%u\n",
>  		__func__, bus_width, rate);
>  
> -	return rk_hdptx_ropll_tmds_mode_config(hdptx, rate);
> +	ret = rk_hdptx_phy_consumer_get(hdptx, rate);
> +	if (!ret)
> +		ret = rk_hdptx_ropll_tmds_mode_config(hdptx, rate);

I think this will need a put if _mode_config fails?

> +
> +	return ret;
>  }


Heiko