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

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Message-ID: <bee17643-e0b4-467b-a632-06f91ac7fc3a@collabora.com>
Date: Tue, 4 Mar 2025 14:20:20 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Maxime Ripard <mripard@...nel.org>
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 3/4/25 10:18 AM, Maxime Ripard wrote:
> 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.

This is just an unfortunate naming of the search key in struct
ropll_config, inherited from downstream, given in hHz rather than Hz.
I've already renamed it in the last patch, while getting rid of those
annoying unit conversions.