linux-kernel - Re: [PATCH v4 08/12] phy: rockchip: samsung-hdptx: Provide config params validation support

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Message-ID: <20250304-romantic-truthful-sambar-deaab1@houat>
Date: Tue, 4 Mar 2025 09:18:23 +0100
From: Maxime Ripard <mripard@...nel.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>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.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 v4 08/12] phy: rockchip: samsung-hdptx: Provide config
 params validation support

On Tue, Mar 04, 2025 at 03:44:07AM +0200, Cristian Ciocaltea wrote:
> Implement the phy_ops.validate() callback to allow checking the PHY
> configuration parameters without actually applying them.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> index 7e1d1c10758249aa5bbddbdaae0108bba04f30df..47db1395051f5d900197871694bab90ca4d6e38e 100644
> --- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> +++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
> @@ -1482,6 +1482,17 @@ static int rk_hdptx_phy_verify_hdmi_config(struct rk_hdptx_phy *hdptx,
>  	if (!hdmi->tmds_char_rate || hdmi->tmds_char_rate > HDMI20_MAX_RATE)
>  		return -EINVAL;
>  
> +	u32 bit_rate = hdmi->tmds_char_rate / 100;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ropll_tmds_cfg); i++)
> +		if (bit_rate == ropll_tmds_cfg[i].bit_rate)
> +			break;
> +
> +	if (i == ARRAY_SIZE(ropll_tmds_cfg) &&
> +	    !rk_hdptx_phy_clk_pll_calc(bit_rate, NULL))
> +		return -EINVAL;

What are you calling bit_rate here? If anything, I'd expect the bit_rate
to be a multiple of the char rate, not a divisor.

Maxime

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