linux-kernel - Re: [PATCH v1 1/1] drm/mediatek/dp: The register is written with the parsed DTS SSC value.

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Message-ID: <86dd866a-8ead-4fd1-993a-672d4947ba84@kernel.org>
Date: Wed, 3 Apr 2024 16:56:24 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Liankun Yang <liankun.yang@...iatek.com>, chunkuang.hu@...nel.org,
 p.zabel@...gutronix.de, chunfeng.yun@...iatek.com, vkoul@...nel.org,
 kishon@...nel.org, matthias.bgg@...il.com,
 angelogioacchino.delregno@...labora.com, jitao.shi@...iatek.com,
 mac.shen@...iatek.com
Cc: dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-phy@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] drm/mediatek/dp: The register is written with the
 parsed DTS SSC value.

On 03/04/2024 08:41, Krzysztof Kozlowski wrote:
> On 03/04/2024 06:05, Liankun Yang wrote:
>> [Description]
>> Severe screen flickering has been observed on the external display
>> when the DP projection function is used with the market expansion dock.
>>
> 
>> +	if (!strcmp(mode_name, RG_XTP_GLB_TXPLL_SSC_DELTA_RBR)) {
>> +		regmap_update_bits(dp_phy->regs, ssc_reg_offset,
>> +			   XTP_GLB_TXPLL_SSC_DELTA_RBR_DEFAULT, read_value);
>> +	} else if (!strcmp(mode_name, RG_XTP_GLB_TXPLL_SSC_DELTA_HBR)) {
>> +		read_value = read_value << 16 | 0x0000;
>> +		regmap_update_bits(dp_phy->regs, ssc_reg_offset,
>> +			   XTP_GLB_TXPLL_SSC_DELTA_HBR_DEFAULT, read_value);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static struct device_node *mtk_dp_get_ssc_node(struct phy *phy, struct mtk_dp_phy *dp_phy)
>> +{
>> +	struct device_node *mode_node = NULL;
>> +
>> +	mode_node = of_find_node_by_name(dp_phy->dev->of_node, SSC_SETTING);
> 
> ?!?!
> You have the node, why do you try to find it?
> 

Wait, that was brainfuck from my side or -ENOCOFFEE. Ignore.

I still have a question though, where did you document new ABI:
dependency on the node name here?

Also, why you are not going through direct children -
of_get_child_by_name()?

Best regards,
Krzysztof